OPERATIONANDINSTALLATIONMANUAL
SDA SERIES 350 - 2100 CFM
LARGE DEHUMIDIFYING DRYERS
IMPORTANT: PLEASE READ CAREFULLY BEFORE ATTEMPTING TO INSTALL OR OPERATE EQUIPMENT
Bulletin No: DH1-655-1
Part No: 882.00225.00
Effective: 4-28-08
Shipping Info
Unpacking and Inspection
You should inspect your dryer for possible shipping damage.
Thoroughly check the equipment for any damage that might have occurred in transit, such as
broken or loose wiring and components, loose hardware and mounting screws, etc.
In the Event of Shipping Damage
According to the contract terms and conditions of the Carrier, the responsibility of the
Shipper ends at the time and place of shipment.
Notify the transportation company’s local agent if you discover damage.
Hold the damaged goods and packing material for the examining agent’s inspection. Do not
return any goods before the transportation company’s inspection and authorization.
File a claim with the transportation company. Substantiate the claim by referring to the
agent’s report. A certified copy of our invoice is available upon request. The original Bill of
Lading is attached to our original invoice. If the shipment was prepaid, write us for a
receipted transportation bill.
Advise customer service regarding your wish for assistance and to obtain an RMA (return
material authorization) number.
If the Shipment is Not Complete
Check the packing list as back-ordered items are noted on it. You should have:
; Dehumidifying Dryer
; Bill of lading
; Packing list
; Operating and Installation packet
; Electrical schematic and panel layout drawings
; Component instruction manuals
Re-inspect the container and packing material to see if you missed any smaller items during
unpacking.
If the Shipment is Not Correct
If the shipment is not what you ordered, contact the parts and service department
immediately at [262] 641-8610. Have the item and order numbers ready to expedite your
return. Hold the items until you receive shipping instructions.
Returns
Do not return any damaged or incorrect items until you receive shipping instructions from the
shipping department.
DH1-655.1
iii
Table of Contents
CHAPTER 1: SAFETY................................................................6
1-1
How to Use This Manual .............................................................................................6
Safety Symbols Used in this Manual.....................................................................6
Safety Tag Information................................................................................................7
Dryer Safety Tags .................................................................................................7
Warnings and Precautions ..........................................................................................8
Responsibility ..............................................................................................................9
General Responsibility ..........................................................................................9
Operator Responsibility.........................................................................................9
Maintenance Responsibility.................................................................................10
Reporting a Safety Defect ...................................................................................11
Responsibility ............................................................................................................11
1-2
1-3
1-4
1-5
CHAPTER 2: FUNCTIONAL DESCRIPTION...........................12
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
Models Covered in This Manual................................................................................12
General Description...................................................................................................12
Typical Features and Components ...........................................................................12
Optional Features......................................................................................................12
The Closed Loop Drying System...............................................................................13
What is Desiccant?....................................................................................................13
The Process/Regeneration Cycle..............................................................................13
Specifying a Drying System ......................................................................................14
CHAPTER 3: INSTALLATION..................................................17
3-1
3-2
3-3
3-4
3-5
3-6
Work Rules................................................................................................................17
Electrical Connections...............................................................................................17
Check For Proper Blower Rotation............................................................................17
Dryer/Drying Hopper Process Air Hose Connection .................................................17
Aftercooler Cooling Water Connection......................................................................18
Drying Hopper Air Trap .............................................................................................18
CHAPTER 4: CONTROL PANEL.............................................20
4-1
4-2
4-3
4-4
4-5
4-6
4-7
Control Panel Indicator Lights ...................................................................................20
Switches and Meters.................................................................................................22
PLC Control...............................................................................................................23
Process Air Temperature Controller..........................................................................23
Temperature Controller LED Indicators.....................................................................25
Temperature Controller Keys – (See Figure 5 in Section 3-6) ..................................26
Optional Communications Protocols .........................................................................26
CHAPTER 5: STARTUP, SHUTDOWN & OPERATION..........27
5-1
5-2
5-3
5-4
Pre-Startup Checks...................................................................................................27
Startup.......................................................................................................................27
Shutdown ..................................................................................................................28
Setting the Process Air Temperature ........................................................................28
DH1-655.1
iv
5-5
5-6
5-7
5-8
5-9
Setting the High and Low Temperature Alarms ........................................................28
Temperature Controller Autotune Procedure ............................................................29
Temperature Controller Internal Switches.................................................................29
Temperature Controller Anti-Tamper Lockout Switch ...............................................29
Changing the Display from Fahrenheit to Centigrade ...............................................30
5-10 Setting the Dewpoint Extend Shift Point....................................................................30
5-11 Regeneration Monitoring System Signal Processor..................................................31
5-12 Auxiliary Process Safety System (Optional)..............................................................32
5-13 Seven Day Timer (Optional)......................................................................................32
CHAPTER 6: MAINTENANCE .................................................35
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
Servicing the Process Air Filters (Models 350-700) ..................................................35
Filter Cleaning/Replacement.....................................................................................35
Servicing the Process Air Filters (Models 850 through 2100) ...................................36
Servicing the Regeneration Filter..............................................................................37
Dirty Filter Alarm Calibration .....................................................................................37
Dewpoint Control System Service.............................................................................38
Symptoms of Worn Out Desiccant ............................................................................38
Desiccant Replacement Procedure...........................................................................39
Process Heater Replacement Procedure..................................................................40
6-10 Regeneration Heater Replacement Procedure .........................................................41
6-11 Restoring a Temperature Controller to the Factory Setup ........................................42
6-12 Regeneration Monitor Advanced Programming ........................................................48
CHAPTER 7: TROUBLESHOOTING .......................................52
CHAPTER 8: APPENDIX..........................................................55
8-1
8-2
Customer Satisfaction Warranty Program...................Error! Bookmark not defined.
Technical Assistance.................................................................................................58
Parts Department ..................................................Error! Bookmark not defined.
Service Department...............................................Error! Bookmark not defined.
Sales Department..................................................Error! Bookmark not defined.
Contract Department.............................................Error! Bookmark not defined.
DH1-655.1
v
Chapter 1: Safety
1-1 How to Use This Manual
Use this manual as a guide and reference for installing, operating, and maintaining your
dehumidifying dryer. The purpose is to assist you in applying efficient, proven techniques
that enhance equipment productivity.
This manual covers only light corrective maintenance. No other maintenance should be
undertaken without first contacting a service engineer.
The Functional Description section outlines models covered, standard features, and safety
features. Additional sections within the manual provide instructions for installation, pre-
operational procedures, operation, preventive maintenance, and corrective maintenance.
The Installation chapter includes required data for receiving, unpacking, inspecting, and setup
of the dehumidifying dryer. We can also provide the assistance of a factory-trained technician
to help train your operator(s) for a nominal charge. This section includes instructions, checks,
and adjustments that should be followed before commencing with operation of the
dehumidifying dryer. These instructions are intended to supplement standard shop
procedures performed at shift, daily, and weekly intervals.
The Operation chapter includes a description of electrical and mechanical controls, in
addition to information for operating the dryer safely and efficiently.
The Maintenance chapter is intended to serve as a source of detailed assembly and
disassembly instructions for those areas of the equipment requiring service. Preventive
maintenance sections are included to ensure that your dehumidifying dryer provides
excellent, long service.
The Troubleshooting chapter serves as a guide for identification of most common problems.
Potential problems are listed, along with possible causes and related solutions.
The Appendix contains technical specifications, drawings, schematics, parts lists, and
available options. A spare parts list with part numbers specific to your machine is provided
with your shipping paperwork package. Refer to this section for a listing of spare parts for
purchase. Have your serial number and model number ready when ordering.
Safety Symbols Used in this Manual
The following safety alert symbols are used to alert you to potential personal injury hazards.
Obey all safety messages that follow these symbols to avoid possible injury or death.
DANGER! DANGER indicates an imminently hazardous situation that, if not avoided,
will result in death or serious injury.
WARNING! WARNING indicates a potentially hazardous situation or practice that, if
not avoided, could result in death or serious injury.
Caution!
CAUTION indicates a potentially hazardous situation or practice that, if
not avoided, may result in minor or moderate injury or in property damage.
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Chapter 1: Safety
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1-2 Safety Tag Information
Dryer Safety Tags
Hot!
Read Operation
and Installation
Manual
High Voltage
Earth Ground
Inside Enclosure
PE Protected Earth
Ground
Lifting Point
350-2100 cfm Dryers
Chapter 1: Safety
7 of 58
1-3 Warnings and Precautions
Our equipment is designed to provide safe and reliable operation when installed and operated
within design specifications, following national and local safety codes. This may include, but
is not limited to OSHA, NEC, CSA, SPI, and any other local, national and international
regulations.
To avoid possible personal injury or equipment damage when installing, operating, or
maintaining this equipment, use good judgment and follow these safe practices:
; Read and follow these operation and installation instructions when installing,
operating, and maintaining this equipment. If these instructions become
damaged or unreadable, additional copies are available from the manufacturer.
; Follow all SAFETY CODES.
; Wear SAFETY GLASSES and WORK GLOVES.
; Work only with approved tools and devices.
; Disconnect and/or lock out power before servicing or maintaining the equipment.
; Use care when LOADING, UNLOADING, RIGGING, or MOVING this
equipment.
; Operate this equipment within design specifications.
; OPEN, TAG, and LOCK ALL DISCONNECTS before working on equipment.
You should remove the fuses and carry them with you.
; Make sure the equipment and components are properly GROUNDED before you
switch on power.
; Use EXTREME CAUTION when working with dryer. HIGH HEAT can be
dangerous. Keep body parts, tools, clothing, and debris away from dryer.
; When welding or brazing in or around this equipment, make sure VENTILATION is
ADEQUATE. PROTECT adjacent materials from flame or sparks by shielding with
sheet metal. An approved FIRE EXTINGUISHER should be close at hand and
ready for use if needed.
; Do not restore power until you remove all tools, test equipment, etc., and the
equipment and related components are fully reassembled.
; Only PROPERLY TRAINED personnel familiar with the information in this
manual should work on this equipment.
We have long recognized the importance of safety and have designed and manufactured our
equipment with operator safety as a prime consideration. We expect you, as a user, to abide
by the foregoing recommendations in order to make operator safety a reality.
350-2100 cfm Dryers
Chapter 1: Safety
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1-4 Responsibility
These machines are constructed for maximum operator safety when used under standard
operating conditions and when recommended instructions are followed in the maintenance
and operation of the machine.
All personnel engaged in the use of the machine should become familiar with its operation as
described in this manual.
Proper operation of the machine promotes safety for the operator and all workers in its
vicinity.
Each individual must take responsibility for observing the prescribed safety rules as outlined.
All warning and danger signs must be observed and obeyed. All actual or potential danger
areas must be reported to your immediate supervisor.
General Responsibility
No matter who you are, safety is important. Owners, operators and maintenance personnel
must realize that every day, safety is a vital part of their jobs.
If your main concern is loss of productivity, remember that production is always affected in a
negative way following an accident. The following are some of the ways that accidents can
affect your production:
• Loss of a skilled operator (temporarily or permanently)
• Breakdown of shop morale
• Costly damage to equipment
• Downtime
An effective safety program is responsible and economically sound.
Organize a safety committee or group, and hold regular meetings. Promote this group from
the management level. Through this group, the safety program can be continually reviewed,
maintained, and improved. Keep minutes or a record of the meetings.
Hold daily equipment inspections in addition to regular maintenance checks. You will keep
your equipment safe for production and exhibit your commitment to safety.
Please read and use this manual as a guide to equipment safety. This manual contains safety
warnings throughout, specific to each function and point of operation.
Operator Responsibility
The operator’s responsibility does not end with efficient production. The operator usually has
the most daily contact with the equipment and intimately knows its capabilities and
limitations.
Plant and personnel safety is sometimes forgotten in the desire to meet incentive rates, or
through a casual attitude toward machinery formed over a period of months or years. Your
employer probably has established a set of safety rules in your workplace. Those rules, this
manual, or any other safety information will not keep you from being injured while operating
your equipment.
350-2100 cfm Dryers
Chapter 1: Safety
9 of 58
Learn and always use safe operation. Cooperate with co-workers to promote safe practices.
Immediately report any potentially dangerous situation to your supervisor or appropriate
person.
REMEMBER:
• NEVER place your hands or any part of your body in any dangerous location.
• NEVER operate, service, or adjust the dryer without appropriate training and first
reading and understanding this manual.
• NEVER try to pull material out of the dryer with your hands while it is running!
• Before you start the dryer check the following:
• Remove all tools from the dryer;
• Be sure no objects (tools, nuts, bolts, clamps, bars) are laying in the
hopper area;
• If your dryer has been inoperative or unattended, check all settings before starting the
unit.
• At the beginning of your shift and after breaks, verify that the controls and other
auxiliary equipment are functioning properly.
• Keep all safety guards in place and in good repair. NEVER attempt to bypass, modify,
or remove safety guards. Such alteration is not only unsafe, but will void the warranty
on your equipment.
• When changing control settings to perform a different mode of operation, be sure
selector switches are correctly positioned. Locking selector switches should only be
adjusted by authorized personnel and the keys removed after setting.
• Report the following occurrences IMMEDIATELY:
• unsafe operation or condition
• unusual dryer action
• leakage
• improper maintenance
• NEVER stand or sit where you could slip or stumble into the dryer
while working on it.
• DO NOT wear loose clothing or jewelry, which can be caught while working on a
dryer. In addition, cover or tie back long hair.
• Clean the dryer and surrounding area DAILY, and inspect the machine for loose,
missing or broken parts.
• Shut off power to the dryer when it is not in use. Turn the switch to the OFF position,
or unplug it from the power source.
Maintenance Responsibility
Proper maintenance is essential to safety. If you are a maintenance worker, you must make
safety a priority to effectively repair and maintain equipment.
350-2100 cfm Dryers
Chapter 1: Safety
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Before removing, adjusting, or replacing parts on a machine, remember to turn off all electric
supplies and all accessory equipment at the machine, and disconnect and lockout electrical
power. Attach warning tags to the disconnect switch.
When you need to perform maintenance or repair work on a dryer above floor level, use a
solid platform or a hydraulic elevator. If there is a permanently installed catwalk on your
dryer, use it. The work platform should have secure footing and a place for tools and parts.
DO NOT climb on dryers, machines, or work from ladders.
If you need to repair a large component, use appropriate handling equipment. Before you use
handling equipment (portable “A” frames, electric boom trucks, fork trucks, overhead cranes)
be sure the load does not exceed the capacity of the handling equipment or cause it to become
unstable.
Carefully test the condition of lifting cables, chains, ropes, slings, and hooks before using
them to lift a load.
Be sure that all non-current carrying parts are correctly connected to earth ground with an
electrical conductor that complies with current codes. Install in accordance with national and
local codes.
When you have completed the repair or maintenance procedure, check your work and remove
your tools, rigging, and handling equipment.
Do not restore power to the dryer until all persons are clear of the area. DO NOT start and
run the dryer until you are sure all parts are functioning correctly.
BEFORE you turn the dryer over to the operator for production, verify all dryer enclosure
panels, guards and safety devices are in place and functioning properly.
Reporting a Safety Defect
If you believe that your equipment has a defect that could cause injury, you should
immediately discontinue its use and inform the manufacturer.
The principle factors that can result in injury are failure to follow proper operating procedures
(i.e. lockout/tagout), or failure to maintain a clean and safe working environment.
1-5 Responsibility
These machines are constructed for maximum operator safety when used under standard
operating conditions and when recommended instructions are followed in the maintenance
and operation of the machine.
All personnel engaged in the use of the machine should become familiar with its operation as
described in this manual.
Proper operation of the machine promotes safety for the operator and all workers in its
vicinity.
Becoming familiar with materials, inspection, speed limitations, screens, and guard
maintenance and total user responsibility will assist you in learning potential areas in need of
observation for danger.
Each individual must take responsibility for observing the prescribed safety rules as outlined.
All caution, warning and danger signs must be observed and obeyed. All actual or potential
danger areas must be reported to your immediate supervisor.
350-2100 cfm Dryers
Chapter 1: Safety
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Chapter 2: Functional Description
2-1 Models Covered in This Manual
This manual provides operation, installation, and maintenance instructions for
WD/SDA/CDA 350, 425, 500, 600, 700, 850, 1000, 1250, 1500, 1800, and 2100 cfm large
dehumidifying dryers in both standard 300˚ F and 400˚ F high temperature “-RT” models.
Model numbers are listed on the serial tag. Make sure you know the model and serial number
of your equipment before contacting the manufacturer for parts or service.
2-2 General Description
Dehumidifying Dryers are designed to generate heated, dehumidified air at carefully
controlled temperatures for use in closed-loop plastic drying systems. Drying systems are
sized to meet the specific requirements stated by the purchaser at the time of purchase.
Moisture removal from hygroscopic (moisture attracting) plastic pellets is an essential step in
the manufacture of high-quality plastic products.
ACS dryers are used by the plastics industry to generate very low dewpoint air that is heated
to a controlled temperature for drying plastic pellets and regrind.
2-3 Typical Features and Components
1. Branch Fusing provides additional protection to the operator and the components on
the dryer's sub-panel.
2. Dewpoint Monitor indicates dryer efficiency
2-4 Optional Features
Options can tailor an ACS dryer to meet the exact requirements of the drying task being
performed.
•
•
•
Dirty filter indicator to advise the operator when it's time to clean the filters.
Water-cooled aftercooler for closed loop regeneration air cooling
SMART PLC to combine PLC features and a "Plain English" interface. This option is
fully described in its own manual.
•
•
Heater Burnout Indicator to monitor the heater(s) amp draw.
Compressed air filter cleaning to lower maintenance on regrind/dusty material drying
processes.
•
Auxiliary high temperature safety system to cut high voltage to the blowers and
heaters in the event of run-away process heaters.
•
•
•
•
•
Seven day timer to allow programmable dryer start up.
Communications to meet customer needs.
Drying Hoppers come in many sizes and mounting configurations.
Conveying Equipment to transport material to and from the drying system.
Insulated Process Air Hose to minimize heat loss between the dryer and the drying
hopper.
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Chapter 2: Functional Description
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2-5 The Closed Loop Drying System
ACS dryers force hot, dry air through the resin in the drying hopper, where the air picks up
moisture from the material and is drawn back to the dryer.
In the dryer, moisture is stripped from the air by a desiccant bed. The dried process air is then
re-heated and delivered back into the drying hopper to dry material again.
This system is a "closed loop", because ambient (outside) air is never introduced into the
process air. The closed loop system is used by ACS because the process air is typically much
drier than ambient air, even after carrying moisture out of the plastic resin. Recycling process
air maintains drying efficiency at a consistently high level.
Figure 1: WD/SDA/CDA 350-2100 Dryer Specifications
Model
Number
Amp
Draw
Dimensions
Hose
Connection
Shipping
Weight
Process
Blower
Regen
Blower
Desiccant
Lbs./Bed
(Inches)
W
(Inches)
I.D.
4
460-3-60
L
H
Lbs.
1000
1000
1100
1100
1200
1200
1450
1450
1600
1600
Hp.
5
5
Hp.
½
½
½
½
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
Large
30
30
30
30
40
40
40
40
Small
76
76
90
90
350
350-RT
425
425-RT
500
500-RT
600
600-RT
700
700-RT
850
850-RT
1000
1000-RT
1250
1250-RT
1500
1500-RT
1800
1800-RT
2100
2100-RT
56
56
61
61
63
63
58
58
59
59
88
88
88
88
88
88
94
94
94
94
94
94
56
56
52
52
66
66
56
56
66
66
84
84
84
84
84
84
73
73
82
82
94
94
88
88
93
93
90
90
90
90
90
90
90
90
90
90
98
98
4
5
5
5
5
6
6
6
6
8
8
8
8
8
8
8
7½
7½
7½
7½
10
10
10
10
3
100
100
120
120
135
135
120
120
130
130
180
180
240
240
310
310
360
360
40
40
103
141
113
146
138
194
156
213
179
235
203
278
120
120
120
120
120
120
120
120
120
120
120
120
3
7½
7½
7½
7½
7½
7½
10
10
15
15
100
100
100
100
100
100
8
8
8
10
10
2-6 What is Desiccant?
Desiccant is a material which attracts and holds (absorbs) water from the air. The desiccant
ACS dryers use is a synthetic crystalline metal aluminosilicate that is blended with a clay
binder and formed into beads.
Absorbed water is driven from saturated desiccant by heating it to a high temperature
(reducing the desiccant's capacity to hold water) and forcing air through it. This moisture
removal process is called "regeneration".
2-7 The Process/Regeneration Cycle
ACS dryers have two desiccant beds. While one bed is on-line in the process air loop, the
other is off-line being regenerated.
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Process Return Air
From Drying Hopper
Bleed
When a desiccant bed is on-
line, it absorbs moisture
from the process air. In
time, the bed becomes
saturated with moisture and
needs to be regenerated.
The dryer automatically
redirects the process
Upper
Control
Valve
Regeneration
Blower
Process
Delivery
Air
Process
Filter
Desiccant
Bed
Desiccant
Bed
Assembly
Regeneration
Heater
airflow to the second bed,
and starts the regeneration
cycle on the first bed.
Process
Blower
Process
Heaters
Lower
Control
Valve
During regeneration, air is
heated to approximately
550°F and forced through
Figure Two:
Airflow Diagram
the desiccant bed. The moisture driven off the bed is bled to the atmosphere.
If the temperature of the air bled to atmosphere (bleed temperature) is measured, a rise can be
observed after a period of time. This condition, called "bed breakthrough" indicates that the
bed is dry. At bed breakthrough, the bleed air temperature peaks between 350°F and 400°F.
Dryer models 350 through 2100 dryers are equipped with the Dewpoint Extend feature. The
regeneration heaters turn off automatically on bed breakthrough for additional energy
savings. A 550°F regeneration temperature will dry the desiccant beds sufficiently to produce
process air dewpoint of -40°F. In a properly sized system, this ultra-low humidity level will
be more than adequate to dry plastics to as little as .003% moisture.
2-8 Specifying a Drying System
There were many variables considered in the selection of your drying system, including: type
of materials, residence time, throughput of the extruder or injection molding machine,
ambient air moisture and temperature, and the altitude at the processing site. Should your
operating environment change, the manufacturer can advise you on necessary equipment and
process time and temperature modifications.
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Chapter 2: Functional Description
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Figure 3: Dryer Dimensions
34" RADIUS
DOOR CLEARANCE
ELECTRICAL ENCLOSURE
DESICCANT TOWER
(LEFT SIDE)
TOP VIEW
OPTIONAL
AFTERCOOLER
A
REGEN BLOWER AND FILTER
PROCESS BLOWER
PROCESS
AIR OUTLET
1.5" MPT
INLET
1
2
3
4
E
B
1.5" MPT
OUTLET
C
REAR VIEW
D
PROCESS AIR
RETURN, FILTER
INLET
PROCESS RETURN
FILTER
PROCESS HEATER
1) PROCESS BLOWER PRES SWITCH
2) REGEN. DIRTY FILTER PRES. SWITCH
3) REGEN BLOWER PRES. SWITCH
4) DIRTY PROCESS FILTER PRES. SWITCH
?
350-2100 cfm Dryers
Chapter 2: Functional Description
15 of 58
Figure 4: Dryer Dimensions
SUGGESTED
MINIMUM
VERTICAL
24"
CLEARANCE
LEFT
SIDE
VIEW
F
I
18"
MINIMUM
MAINTENANCE
CLEARANCE
G
H
Model
850
A
84
B
C
56
D
E
90
F
G
H
74
I
88
88
88
34 ½
34 ½
34 ½
44 ½
44 ½
44 ½
87 ½
87 ½
87 ½
88
84 ½
84 ½
84 ½
70 ½
70 ½
70 ½
83
83
83
83
83
83
1000
1250
1500
1800
2100
84
56
90
74
84
56
90
74
100
100
100
90 ½
90 ½
90 ½
82 ½
82 ½
82 1/2
90 ½
90 ½
90 ½
91 ½
91 ½
91 ½
88
88
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Chapter 2: Functional Description
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Chapter 3: Installation
3-1 Work Rules
The installation, operation, and maintenance of this equipment must be conducted in
accordance with all applicable work and safety codes for the installation location. This may
include, but not limited to, OSHA, NEC, CSA, and any other local, national and international
regulations.
1. Read and follow these operating instructions when installing, operating and
maintaining this equipment. If the instructions become damaged or unreadable,
additional copies are available from the manufacturer.
2. Only qualified personnel familiar with this equipment should work on or with this
dryer.
3. Work with approved tools and devices.
4. Disconnect the electricity before maintenance or service. If the dryer is installed with
a power cord that can be unplugged, unplug it. If the dryer is permanently wired to a
power main, a fused power disconnect must be installed to allow the disconnect to be
locked in the "OFF" position. Open and lock out the disconnect installed in the
control enclosure.
3-2 Electrical Connections
The voltage, phase and amp draw information is listed on the serial tag.
; Line voltage must be within ±10% of the voltage listed on the serial tag, or damage
may occur. Phase imbalance must be less than 5%.
; Fulfill all national, state and local safety and electrical code requirements.
; Connection should be made by a qualified electrician.
; Connect main power to the dryer at the disconnect or terminals in the upper right
corner of the control enclosure.
; Install a fused disconnect with a lockout feature in the power main leading to the
dryer.
; The power drop must include a ground wire.
3-3 Check For Proper Blower Rotation
The blowers are rotating properly when air flows from the delivery outlet.
•
Incorrect phasing of power leads will cause backward rotation of blower motors and
contamination of the desiccant.
If both blowers are rotating improperly, reverse any two wires at the fused disconnect outside
the dryer or at the disconnect/terminal in the control enclosure. This assures that both blowers
will be rotating in the proper direction.
•
Reverse the wires at the motor starters only if one blower is rotating incorrectly.
3-4 Dryer/Drying Hopper Process Air Hose Connection
; Use high-temperature flexible dryer hose or rigid tubing to connect the dryer to the
drying hopper.
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; Keep the delivery (to the drying hopper) hose as short as possible to minimize heat
loss. Insulated hose is recommended and available for maximum energy savings.
; Do not use insulated hose on the return (from the drying hopper)
; Do not shorten the return hose. The return air to the blower must be 150°F or below.
; Make sure the hoses are not kinked.
; Drying hopper air inlet and outlet locations vary, but always connect the hoses so the
dry process air from the dryer enters the bottom of the drying hopper and flows out
the top to return to the dryer inlet.
3-5 Aftercooler Cooling Water Connection
The Aftercooler cools the moist air returning to the dryer from the drying hopper. The
aftercooler can cool the return air from 250°F to about 150°F. This maintains the dryer's
efficiency and condenses unwanted plasticizers from the airstream.
1. Support both sides of the fitting when making the cooling water connections to
prevent damage to the aftercooler coil.
2. Connect 85°F water to the 1½" NPT inlet closest to the exiting air side of the
aftercooler coil. This will cool the process air about 100°F and raise the water-out
temperature about 10°F.
Aftercooler
Model
Recommended Cooling
Water Flow Rate (GPM)
6.6 gpm
AFT350
AFT425
AFT500
AFT600
AFT700
AFT850
AFT1000
AFT1250
AFT1500
AFT1800
AFT2100
10 gpm
10 gpm
13.2 gpm
18 gpm
18 gpm
22 gpm
22 gpm
25 gpm
25 gpm
25 gpm
3-6 Drying Hopper Air Trap
ACS’s exclusive air trap assembly in the top of the drying hopper prevents ambient air from
contaminating the material being dried.
5. Keep the material level above the bottom edge of the air trap for maximum
efficiency.
6. Use a hopper loader or vacuum conveying system to maintain the proper material
level.
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Figure 5: Typical Control Panel
Process Blower On
Process Heater On
WD Series
Dehumidifying Dryer
s Air Temperature Controller
Regeneration Dirty Filter
Process Delivery Temperature
PV
Process Dirty Filter
Process
Process
Process
Blower On
Heater On
Dirty Filter
F
SV
High Process
Air Temp
Low Process Process Blower
Air Temp Failure
Low Process Air Temp
RMT
AT
Regeneration Heater On
Regeneration Blower On
Process Blower Failure
High Process Air Temp
High Dew Point
Regeneration Exit Temperature
Regen
Blower On
Regen
Heater On
Regen
Dirty Filter
DATA
TEACH
Left Bed In Regeneration
High Regen
Air Temp
Low Regen
Air Temp
Regen Blower
Failure
High
Dew Point
Left Bed
In Regen
Right Bed
In Regen
Regeneration Monitor
egeneration Air Temperature
egeneration Air Temperature
Regeneration Blower Failure
Process Dew Point
Valve Position
Fault
Set Point
Critical Alarm
Silence
1
2
-15
-25 -20
-10
-5
-35
-30
0
-40
DEW POINT(F.)
Critical Alarm Silence
Dual Set Point Selector
Control Power
Start/Stop
Sequence
Shutdown
Off
On
Adjustment
Valve Position Fault
A0542533
Process Air Dewpoint Meter
Sequence Shutdown
Start/Stop
Control Power Switch
Redundant High Temp Safety
Redundant High Temp
Reset
Redundant High Temp
Alarm
DATA
TEACH
Redundant High Temperature Alarm
Redundant High Temperature Rese
Redundant High Temperature Safet
A0542534
Process Heater Amps
100
100
100
150
50
150
50
150
50
0
200
0
200
0
200
A-C AMPERES
A-C AMPERES
A-C AMPERES
Heater Burn Out Indicator Amp Met
Regen Heater Amps
30
30
30
45
45
45
60
60
60
15
15
15
0
75
0
75
0
75
A-C AMPERES
A-C AMPERES
A-C AMPERES
A0542757
Seven Day Timer
Programmed Start/Stop
A0544749
OPTIONAL EQUIPMENT SHOWN
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Chapter 4: Control Panel
4-1 Control Panel Indicator Lights
PROCESS BLOWER ON
This indicator lights when the process blower is energized.
PROCESS HEATER ON
This indicator lights when the process air heaters are energized.
HIGH PROCESS AIR TEMPERATURE ALARM
; This indicator lights when the temperature at the process air thermocouple is above
the set high alarm value.
; When the indicator lights, the alarm relay is energized and all the heaters turn off
while the blowers remain on.
; The alarm mode and value are factory-set to track 25°F above the process setpoint.
The alarm value is a deviation above the process setpoint.
; When the temperature at the process thermocouple returns to within the acceptable
range, the alarm output is de-energized and all the heaters turn on again
automatically.
; The alarm range may be altered - See Section 5-5.
REGEN BLOWER ON
This indicator lights when the regeneration blower is energized.
REGEN HEATER ON
This indicator lights when the regeneration heater is on.
LEFT BED REGENERATING & RIGHT BED REGENERATING
The indicator lit shows which bed is currently being regenerated [off-line].
HIGH DEW POINT ALARM
This indicator lights when the process air delivery dew point exceeds the dew point shift
point, as set by the adjustment pot on the control enclosure graphic panel. See Section 5-6.
DIRTY FILTER ALARM
; This indicator lights if the pressure differential across either the process air return
filter or the regeneration inlet filter exceeds the pressure switch setting.
; This indicates a filter in need of service.
; The light resets automatically when the filter is serviced.
; The pressure switch is adjustable - See Section 6-4.
LOW PROCESS AIR TEMPERATURE ALARM
; This indicator lights when the temperature at the process air thermocouple is below
the set low alarm value.
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; The alarm mode and value are factory-set to track 25°F below the process setpoint.
The alarm value is a deviation above the process setpoint.
; This alarm is informational. If the alarm light stays lit for an extended period of
time, check for blown fuses or possible burnt-out heaters.
; When the temperature at the thermocouple returns within limits, the alarm clears
automatically.
; This alarm is delayed on initial start-up to avoid nuisance alarms.
; The alarm range may be altered. See Section 5-5.
PROCESS BLOWER FAILURE ALARM
; This indicator lights if pressure switch 2PS detects a loss of process blower air
pressure.
; All heaters are shut-off until the alarm is cleared.
REGEN BLOWER FAILURE ALARM
; This indicator lights if pressure switch 1PS detects a loss of regeneration blower air
pressure.
; All heaters are shut-off until the alarm is cleared.
HIGH REGEN AIR TEMPERATURE ALARM
This indicator lights when the thermocouple below the regeneration heater assembly senses
an abnormally high temperature.
1
Note: Do not adjust the factory setpoint of 3CNTL, the
temperature controller inside the enclosure.
DIN panel-mounted
16
The regeneration heaters are shut-off until the temperature falls below the alarm point. The
regeneration blower will continue to run and cool the heaters and desiccant bed.
The alarm light will clear automatically when the temperature drops below the alarm point,
and the heaters will re-energize automatically.
LOW REGEN AIR TEMPERATURE
This indicator lights if the regeneration bleed temperature has not reached the factory setpoint
of 150°F within 30 minutes of the start of bed regeneration.
The panel meter (2CNTL) and the PLC monitor the regeneration bleed temperature.
This alarm is informational, and does not affect the regeneration process.
This alarm may indicate a very wet desiccant bed or, if the light does not go off within an
hour, malfunctioning or burnt out regeneration heaters. For more details on the regeneration
monitoring system, see Section 5-7.
CRITICAL ALARM SILENCE
Press this button to turn off the audible alarm and flashing beacon when a critical, operation
stopping alarm occurs.
The alarm will repeat every five minutes unless the problem causing the alarm has been
resolved.
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VALVE POSITION ERROR
A pair of position switches confirm proper shifting of the valves.
If full travel is not confirmed by the switches, the cycle will not begin on the new bed.
4-2 Switches and Meters
ON/OFF SELECTOR SWITCH
This energizes or de-energizes the dryer's control power.
START/STOP PUSH-BUTTON
Press this momentary contact switch to start the dryer. Press this switch to shut down an
operating dryer. The dryer shutdown sequence is:
1. Process heaters shut off immediately.
2. Process blower continues to run for 20 minutes to cool the process heater, then shuts
off.
3. The regeneration cycle of the off-line bed will continue until finished, the
regeneration heaters will shut off, followed by the regeneration blower.
DEWPOINT METER
; This meter indicates the current process air delivery moisture content.
; When the Push To Set button is pressed, the meter indicates the Dewpoint Shift
point. See Section 5-10.
PUSH TO SET
This push-button is used when setting or confirming the Dewpoint Shift point. See Section 5-
6.
DEWPOINT SHIFT ADJUST
This potentiometer [pot] is used when setting the Dewpoint Shift point. See Section 5-6.
SHIFT SET SELECTOR SWITCH
In the "ON" position, the drying temperature is raised or lowered to the ¼ DIN controller's
alternate temperature - see Section 4-5.
OVER TEMPERATURE RESET [Optional]
This push-button resets the control system to allow restart of heaters and blowers after
process air temperature has dropped below the high value programmed into the 1/8 DIN
panel meter (4CNTL)
This is on dryers equipped with the auxiliary hi-temperature safety option.
HEATER BURN-OUT INDICATOR METERS [Optional]
; The six current indicating meters monitor the current draw on each phase of the
process and regeneration heaters.
; During normal operation, all three meters (phases) should read within one or two
amps of each other.
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; If one or two of a heater's three meters indicates a low reading, a burned-out heater is
likely, and should be serviced.
4-3 PLC Control
These dryers are equipped with an Omron C28K programmable logic controller (PLC).
The "brick" type PLC has 28 I/O points - 16 inputs and 12 outputs.
All inputs are 115 VAC, except for the 24 VDC input #1 from the dewpoint circuit board.
All programming and logic is factory installed on an EPROM, and cannot be modified.
A battery backup retains the programming during power failures.
Battery life is 5 years at room temperature.
If the alarm indicator blinks intermittently, replace the battery [P/N A0544701] within one
week.
4-4 Process Air Temperature Controller
Standard ACS dryers use a microprocessor based PID control for maintaining process air
temperature. The controller is a modular, self-contained unit that can slide from its mounting
housing. All parameters except for the process air setpoint are factory set and adjusted; no
field adjustment to the internal controls is normally necessary.
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Figure 6: Process Air Temperature Controller
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4-5 Temperature Controller LED Indicators
Process Value Numeric LED
During normal operation, this red LED on the control displays the process temperature at the
"To Process" thermocouple. It also lists parameters during setup and error messages if an
error occurs.
Set Value Numeric LED
During normal operation, this green LED on the control displays the process set point you
want the dryer to maintain. It also displays parameter and pre-set function values during
setup.
Output LED
This orange LED lights when the control output energizes the process air heater.
Remote LED
This lights when remote operation occurs on dryers equipped with optional communications.
Shift LED
This orange LED lights if the optional Shift Set switch is closed. The process temperature
will be changed by the amount set in the
value in the Level 1 parameters. To shift to a
lower value, be sure to enter a negative value.
Auto-Tune LED
This orange LED flashes during the Auto-Tune sequence. The controller will automatically
determine the proper P.I.D. values for the operating conditions. See Section 6-11.
Alarm One LED - High Temp Alarm
This lights when the process air temperature has risen more than 25°F [factory default] from
the setpoint. The alarm relay in the PLC is energized when this LED is lit.The audible/visual
alarm will sound if the dryer is so-equipped. All heaters turn off and the blowers stay on to
cool the heaters. It is adjustable - see Section 5-5.
Alarm Two LED - Low Temp Alarm
This lights when the process air temperature drops more than 25°F [factory default] from the
setpoint. The alarm relay in the PLC is energized when this LED is out. The audible/visual
alarm will sound if the dryer is so-equipped. It is adjustable - see Section 5-5.
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4-6 Temperature Controller Keys – (See Figure 5 in Section 3-6)
LEVEL KEY
When pressed for two seconds or more, this key selects the next of the three indication levels
(0, 1 and 2) where specific control parameters may be set. The control defaults to level 0 on
power up.
REMOTE KEY
This key is on controls with optional communications. For information on RS-232C, RS-422,
or RS-485 communications, refer to the Communications Manual [part number A0535959].
For RS-232C units with the SPI CPC protocol converter, refer to the CPC Operation &
Installation Manual [part number A0536527].
MODE KEY
This key scrolls through the parameters that can be set in indication levels 0 and 1.
Note: During normal operation, use this key to change the alarm setting only. The
factory alarm settings are 25°F above and below the setpoint and are
satisfactory for most applications.
DOWN KEY
This key lowers the process air set point temperature. During setup, it decreases the value of
the parameter displayed by the Set Value (SV) LED.
UP KEY
This key raises the process air set point Temperature. During setup, it increases the value of
the parameter displayed by the Set Value (SV) LED.
AUTOTUNE KEY
When pressed and held for one second or more, this key starts the Auto-Tune function.
4-7 Optional Communications Protocols
For SPI, RS-232C, RS-422, and RS-485 communications, a connection port on the electrical
cabinet permits easy hook-up to the host computer. The connection port is a direct pin to pin
extension from the plug on the back of the temperature controller. For pin outs, consult the
control module's communication manual [part number A0535959].
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Chapter 5: Startup, Shutdown & Operation
5-1 Pre-Startup Checks
; Check the process and return hoses for tight connections.
; Check that all companion equipment, such as the drying hopper, loading system and aftercooler are
ready for operation.
; Check the dryer electrical connections.
Note: Clean the rust-preventive oil from inside the drying hopper. Failure to clean the hopper
will cause fouling of the desiccant in the dryer, and will void the warranty.
5-2 Startup
Close the slidegate at the bottom of the drying hopper.
1. Fill the drying hopper with material.
2. Turn on (energize) the disconnect switch in your power drop, then turn on the one on the dryer.
3. Flip the on/off switch to "ON."
4. Press the stop/start button.The blowers should start, and the proper control panel indicators
should light.
5. Make sure both blowers are turning the right direction. Verify rotation direction is correct. If
one or both blowers do not start:
• Check to see if an overload on the blower motor starter has tripped. If so, set it
properly and reset. Check the blower fuses, too.
• If one of the optional Valve Position Error lights is lit, the blowers will not start.
Make sure the valve arm has tripped the proper limit switch. If the electric
actuator is not fully extended or retracted, check the line fuse (8FU) near the
actuator's 24 VDC power supply.
The valve actuator has built-in limit switches to shut off its motor.
It must fully extend and retract to prevent the motor from burning out.
•
If a blower failure light is lit after the blower has run for a few seconds and shut down, the blower
pressure switch will need to be adjusted until the failure light goes out.
The pressure switches at the rear of the dryer were adjusted during
factory-testing. Pressure changes in the drying system as installed
may make some adjustment to these necessary during initial startup.
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6. If the dryer has an aftercooler, make sure there is proper flow of cooling water flow through the
coil, and any trapped air has been bled from the system.
7. Make sure the damper on the hopper air inlet tube is about 50% open.
8. Remove the lower end of the 2½" flex hose from the tube stub on the lower drying hopper.
Carefully adjust the damper valve on the return line back to the filter to achieve approximately
200 cfm air flow out of the flex hose.
9. Set the process setpoint on the temperature controller.
10. After the proper pre-drying time for the initial hopper fill has elapsed, fully open the drying
hopper slidegate.
To allow proper residence time during continuous processing, the material level in the hopper should be
maintained at the midpoint of the air trap assembly.
5-3 Shutdown
•
Turn off the conveying system supplying the drying hopper.
•
•
When processing is complete, close the hopper slide gate and shut down any in-line
companion equipment, i.e. an aftercooler.
Push the Start/Stop button. After both blowers have shut down and regeneration is
complete, turn the On/Off selector switch "OFF".
•
•
Empty the drying hopper, if desired.
For maintenance or long-term shut down, open (de-energize) the electrical disconnects at
the dryer and in the power drop.
5-4 Setting the Process Air Temperature
To Change Process Air Temperature Set Point:
•
•
Press
to raise the Setpoint.
Press
to lower the Setpoint.
5-5 Setting the High and Low Temperature Alarms
To Change the Process Air High Temperature Alarm Setting:
1. Press
for at least two seconds to access the level 1 parameters.
2. When the PV LED display shows
temperature alarm value.
, use
and
to set the desired high
The high temperature alarm value is a deviation of the process air temperature set point. The alarm
value will track the set temperature. If the high temperature alarm is set to "25", a high temperature
alarm occurs if the process air temperature rises more than 25°F above the process air temperature
setpoint.
3. Press
until the PV LED shows
. Use
and
to set the desired low
temperature alarm value.
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The low temperature alarm value is a deviation of the process air temperature set point. The alarm value
will track the set temperature. If the low temperature alarm is set to "-25", a low temperature alarm
occurs if the process air temperature falls more than 25°F below the process air temperature setpoint.
4. Press
until the Level 0 values [process air temperature setpoint and process air
temperature] are displayed. The High Temperature Alarm is now set.
5-6 Temperature Controller Autotune Procedure
Auto-tune fine tunes the control's PID to process requirements. Auto-tune whenever the process under
control changes or when the controller cycles more than 2° or 3° above or below the setpoint.
Don't be alarmed by the control's response. It may take the process temperature above and below the set
points as many as three times. It will then level off and control to the process set point. Auto-tuning can
take up to 30 minutes, and is best done before any process is being run.
To Auto-Tune the Control:
1. Press and hold down
for several seconds until the "AT" indicator flashes. The AT LED
flashes to indicate that the control is tuning itself.
2. When the AT LED light stops flashing, the controller is tuned and ready for operation.
5-7 Temperature Controller Internal Switches
The control is set up and tested at the factory for optimum operation, and the internal switches don't
need to be adjusted. If the control does not work properly, or you suspect someone has accidentally
changed some settings, there are two solutions. First, try the AUTO-TUNE PROCEDURE as described
in Section 6-11. If that doesn't work, see Section 6-15.
5-8 Temperature Controller Anti-Tamper Lockout Switch
This slide switch prevents unauthorized changes to set points. If this switch [SW101] is On,
the
,
,
and
keys are disabled. Only the process set point and
alarm settings may be viewed. Dryers are factory-set with the protection turned Off.
Enabling the Lockout Feature:
1. Disconnect main electrical power to the dryer.
2. Press up the latch at the bottom of the control module's front panel and slide out the control
chassis.
3. Locate the slide-type switch SW101 {PROTECT} on the left circuit board. Slide it to ON.
4. Slide the chassis back into the control module's housing.
Tamper protection will now be enabled.
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5-9 Changing the Display from Fahrenheit to Centigrade
To change the display from the factory °F setting to °C:
1. Disconnect main electrical power to the dryer.
ON
1
2
3
4
5
6
2. Press up the latch at the bottom of the control module's front panel and slide out the control chassis.
3. Locate DIP switch SW201 {FUNCTION} on the right circuit board.
4. Slide the #5 pin to OFF.
5. Slide the chassis back into the control module's housing.
6. Cover the °F label with the °C sticker included in the information packet.
5-10 Setting the Dewpoint Extend Shift Point
1. 350 - 2100 cfm dryers shift air flow from the on-line desiccant bed to the regenerated desiccant
bed based on actual dewpoint demand, not by fixed time cycles.
2. Set the Dewpoint Shift Point to the highest process air moisture content you would like to allow
before the dryer shifts air flow to the regenerated desiccant bed.
3. The Dewpoint Shift Point is set with the dewpoint meter, the Push To Set push-button, and the
Dewpoint Shift Adjust potentiometer [pot].
To Change the Dewpoint Shift Point:
1. Carefully loosen the locking hex nut on the Dewpoint Shift adjust pot. The pot is just below the
dewpoint meter.
2. Press and hold the Push To Set push-button next to the Dewpoint Shift Adjust pot.
3. With a small screwdriver, adjust the Dewpoint Shift Adjust pot until the dewpoint meter reads
the highest acceptable process air dewpoint. This is the point that airflow will be shifted from
the on-line bed to the regenerated bed, providing the regeneration cycle has been completed.
4. Release the Push To Set push-button and re-tighten the locking nut on the Dewpoint Shift
Adjust pot.
Note: Don't let the adjusting screw move and change the setting.
5. Reconfirm the Dewpoint Shift Point by pressing the Push To Test push-button.
Note: Securely lock the Dewpoint Shift Adjust pot in place with the locknut. An inadvertent
change in the pot's setting will cause a change in the Dewpoint Shift Point.
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5-11 Regeneration Monitoring System Signal Processor
Dryer models 350 through 2100 have a 1/8 DIN signal processor that monitors the bleed air discharged
from the desiccant tower being regenerated. The signal processor has four programmable temperature
setpoints that, when reached, signal the PLC to cycle through the regeneration process. The PLC
interprets the outputs from the signal processor depending on the part of the regeneration process
currently underway.
The signal processor's setpoints are factory set for efficient operation in most situations. The
manufacturer does not recommend changing the setpoints indiscriminately, but persons knowledgeable
of the processing system may fine tune the setpoints for decreased energy consumption.
LL Setpoint - Low Regeneration Alarm Setpoint - 130°F
This setpoint alerts the PLC and operator to possible regeneration heater problems. If this bleed air
temperature is not reached within 30 minutes of the regeneration heaters being energized, the Low
Regen Air Temp Alarm lights. The light will go out automatically when the setpoint is reached. The
alarm can indicate burnt out regeneration heaters, or an extremely moist desiccant bed.
L Setpoint - Regeneration Blower Shutdown Temp - 160°F
After a desiccant tower has been regenerated, the regeneration blower continues to cool the desiccant
until this setpoint is reached. The signal processor informs the PLC, and the PLC shuts down the
regeneration blower to prevent loading the regenerated bed with ambient moisture.
H Setpoint - Optional Closed Loop Regeneration Cool Down Temp - 250°F
This setpoint output is used on dryers equipped with optional closed loop regeneration cool down.
When this setpoint is reached, the output signals the PLC to shift the Wye valve in this device's
aftercooler and the cooling water valve to close loop and cool the regeneration air. The very dry
regeneration bleed air is directed back into the aftercooler where it is cooled to about 150°, and then
back into regeneration blower inlet. This ensures that no moisture will be added to the desiccant bed
until it goes back on line.
HH Setpoint - Heater Cut Off Temp - 300°F
This setpoint is the temperature at which the PLC is signaled to shut off the regeneration heaters
because the desiccant is dry, and begin the cool down process.
Raising this setpoint will not significantly improve dryer performance, but merely increase energy
consumption.
Basic information is listed below. For more detailed information, refer to the processor manual shipped
with the dryer.
To change the Regeneration Monitor System Setpoints:
• Press
until the LED above the parameter to be changed (LL, L, H, or HH)
is lit. The number value displayed is the selected parameter's current set point.
•
• Within 5 seconds, press
until the digit to be changed blinks.
• Press
until the desired number value is displayed in that digit position.
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• Press
again to move one digit to the right. Then press
desired value.
to display the
• Follow this procedure to set all four digits.
• When satisfied with the value displayed, press
to save the new value to the
regeneration monitor's memory, and move on to the next parameter, if desired.
• Press
repeatedly to review the new settings.
5-12 Auxiliary Process Safety System (Optional)
This option provides an extra level of protection from hopper meltdown due to a runaway heat
condition such as a fused heater contactor. When triggered, this system will drop out high voltage to all
heater contactors and blowers. This drastic action, to protect the resin and the drying hopper, will only
occur if a high temperature condition is not first handled by the ¼ DIN control [Section 4-1] on the
dryer subpanel and/or the heater contactor(s) is/are fused.
This system must be manually reset by pressing the OVERTEMP RESET button after fixing the
problem.
This option uses a signal processor identical to the one used in the regeneration monitoring system. It
monitors the process temperature through a thermocouple mounted at the drying hopper inlet. Only one
of the setpoints [H] is used. See Section 5-11 for instructions on setting the H setpoint.
The H setpoint should be the highest temperature tolerable at the drying hopper, before resin or drying
hopper degradation occurs. This temperature varies depending on the resin and the drying temperature,
but a suggested starting temperature is 75°F above the drying temperature.
5-13 Seven Day Timer (Optional)
The seven day timer can be programmed for weekly ON/OFF operation of up to sixteen setpoints. An
internal battery back-up holds the settings in memory when the dryer is de-energized.
The dryer's Power toggle switch must be in the "ON" position for normal or programmed dryer
operation.
• To bypass programmed operation, switch the manual override switch on the
seven day timer to the "ON" position.
• To execute programmed operations, set the manual override switch on the seven
day timer to the "RUN" position.
• To de-energize the seven day timer, set the manual override switch to the "OFF"
position.
The dryer will not run if the timer switch is "OFF".
Program 1 is operational, Program 2 is not used.
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Setting the Current Day of the Week, Hour and Minute:
1. Apply main power to the dryer.
2. Turn on the timer by sliding the left manual override switch to the "ON" position. The timer's
memory is cleared on power up.
MODE
SUN
TIM ADJ
3. Press and hold
until
becomes visible and
blinks.
4. Press
or
until the current day of the week is displayed.
5. Press
to store the current day of the week in the timer's memory. The day of the week
indicator will stop blinking.
6. The current hour indicator should now be blinking. Press
or
to set the current hour.
The time is set in a 24-hour format.
7. Press
blinking.
to store the current hour in the timer's memory. The hour indicator will stop
8. Press
9. Press
or
to set the current blinking current minute indicator.
to store the current minute in the timer's memory. The minute indicator should stop
blinking.
Setting the start up time:
MODE
PROG 1
1. Press and hold
until
is lit and the hour indicator is blinking.
2. Press
or
until the desired dryer start up hour is displayed. The start up time is set in a 24-
hour format.
3. Press
blinking.
to store the dryer start up hour in the timer's memory. The hour indicator will stop
4. Press
or
until the desired dryer start up minute is displayed. The minute indicator should
be blinking.
5. Press
blinking.
to store the start up minute in the timer's memory. The minute indicator will stop
6. Now the #1 output status indicator should be blinking. Press
status.
to turn the output to the ON
33 of 58
350-2100 cfm Dryers
Chapter 5: Startup, Shutdown & Operation
7. Press
blinking.
once. The hour and minute display returns to zeroes and the hour indicator should be
Setting the stop time:
1. Press
or
until the desired dryer shut down hour is displayed. The shut down time is set
in a 24-hour format.
2. Press
blinking.
to store the shut down hour in the timer's memory. The hour indicator should stop
3. Press
or
until the desired dryer shut down minute is displayed. The minute indicator
should be blinking.
4. Press
blinking.
to store the shut down minute in the timer's memory. The minute indicator will stop
5. Now the #1 output Status indicator should be blinking. Press
OFF status.
once to set the output to the
6. Press
once. The hour and minute display will return to zeroes and the hour indicator
should be blinking.
Set the days of the week for automatic operation:
MODE
1. Press
flashing.
. The Day of the Week indicator will appear and the Sunday indicator should be
2. Press
to automatically operate the dryer on Sunday, press
to prevent the dryer from
automatically operating on Sunday. Reverse video - white characters on a black background
SUN
indicates the day(s) selected for automatic operation. For example:
3. Press
set.
to store Sunday in the timer's memory. Proceed until all desired days of the week are
Put the timer into Run mode:
MODE
1. Press
until the current time appears. The colon between the hours and minute
should be blinking. The timer is now in run mode and automatic operation will begin as
programmed.
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Chapter 6: Maintenance
6-1 Servicing the Process Air Filters (Models 350-700)
WARNING: Operating the dryer without the process air filters installed will void the warranty.
Filter Cleaning is an important part of dryer maintenance.
Dryer models 350 through 700 have single high temperature [up to 350°F] cartridge cannister-type filter
in the process air loop. It’s mounted above the process blower on the rear of the dryer. This filter
protects the centrifugal blowers from plastic fines being drawn in from the drying hopper. Regular filter
cleaning will keep your dryer operating at peak efficiency.
The filter can be washed or blown out, but remember, the filter’s dirt holding capacity is reduced with
each washing. The risk of dirt reaching the clean side of the filter during cleaning, plus possible filter
damage from high pressure washing or blowing makes washing a gamble.
Careful cleaning or washing can be done when the airflow restriction trips the dirty filter alarm. Filters
should not be washed more than six times or used for more than a year, whichever comes first.
Use a detergent that won’t damage the filter media. Such a detergent permits easy removal of dirt
particles through flushing and rinsing. An effective detergent will remove the fine particles from the
pores of the filter media.
The filter’s manufacturer recommends FM 1400 washing compound. It is formulated specifically for air
filter element cleaning. It is non-sudsing and works in hot or cold water. FM 1400 contains
biodegradable synthetic detergents and is non-phosphate, non N.T.A. It is marketed by Filter Service
Corp., 2603 A West Main, Farmington, New Mexico, [505] 326-1127.
6-2 Filter Cleaning/Replacement
•
Turn off and/or lock out electrical power [and compressed air, if so equipped] to the
dryer.
•
Remove the hand knobs or threaded fasteners securing the filter access cover and
remove the cover.
•
•
•
Remove the nut on the center retaining rod to remove a filter cartridge.
Inspect the filter - a damaged filter should not be washed or reused.
Remove loose dirt from the filter with compressed air or a water hose. Compressed air
should be less than 100 psi – use a 1/8"diameter nozzle at least 2" away from the
filter. Water should be less than 40 psi – don’t use a nozzle.
•
•
•
Soak the filter in FM 1400 or comparable detergent solution for at least 15 minutes.
Never soak more than 24 hours.
Swish the filter around in the solution to agitate, loosen dirt particles, and put them in
suspension.
Rinse the filter from the “clean” side to the “dirty” side with a gentle stream of water
350-2100 cfm Dryers
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to remove all dirt and suds (less than 40 psi, no nozzle). If the clean or downstream side of the filter has
been contaminated with dirty water during the soak cycle, rinse from both sides.
•
•
Dry the filter before re-using. Circulate warm air at less than 160ºF. Do not use a light bulb to dry the
filter.
Inspect for holes and tears by looking though the filter toward a bright light. Check for damaged gaskets
or dented metal parts. Do not re-use a damaged filter.
6-3 Servicing the Process Air Filters (Models 850 through 2100)
On 850 through 2100 cfm dryers, the multiple high temperature [up to 350°F] process filters are located
in the housing under the blower platform on the left rear corner of the dryer. These filters protect the
centrifugal blowers from plastic fines being drawn in from the drying hopper. Regular filter cleaning
will keep your dryer operating at peak efficiency.
Filter Cleaning/Replacement
•
•
Turn off and/or lock out electrical power [and compressed air, if so equipped] to the dryer.
Remove the hand knobs or threaded fasteners securing the filter access cover and remove
the cover.
•
•
Remove the nut on the center retaining rod to remove a filter cartridge.
Blow or vacuum each filter until the filter is clean. If the filter is worn through or can't be
cleaned, replace it.
•
Remove the small fines cleanout cover from the lower back portion of the filter unit below
the air outlet transition.
•
•
•
Vacuum out the fines and reinstall the cover and gasket.
Reinstall all the filter cartridges, tightening them securely.
Replace the door or access cover, being careful to keep the gasket intact, if supplied.
Recommendations for Cleaning Heavily Soiled 850 through 2100 cfm Process Filters
Vacuuming
Try vacuum cleaning a soiled filter first. Vacuuming removes most large particles and surface
contaminants, and may be all that’s needed the first time a filter is cleaned. Use a commercial duty
[recommended] or household vacuum cleaner. Vacuum the filter from the air intake [dirty] side only.
Compressed Air Cleaning
Blow clean, dry compressed air up and down the pleats, blowing out the filter from the clean side.
Don’t shoot the air in a criss-cross motion against the grain of the pleats - you won’t end up with a
clean filter, and you might damage it.
Washing
As a last resort, wash the filter. This is only necessary when the pressure drop is too high due to fine
dirt embedded in the filter or there’s been oily mist near the intake air location. Use a mild, low sudsing
detergent and warm water. Soak the filter 5–10 minutes, then gently agitate for several minutes. Rinse
thoroughly with clean water to remove all detergent. Let the filter dry completely before returning it to
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service. Satisfactory filtration should be obtained through the second or third washing , however the dirt
holding capacity of the filter decreases after each washing.
After Each Cleaning:
•
Inspect the filter element – hold a light bulb behind the element to find fatigued paper or residual
dirt.
•
•
Inspect the end plates – damage here could allow air to bypass the filter.
Look for rust on the end plates and metal core – rust particles could flake off and contaminate the
dryer and resin.
•
Check the gasket for damage – a damaged gasket will allow contaminants into the process. Replace
if needed.
6-4 Servicing the Regeneration Filter
WARNING:
Operating the dryer without the regeneration air filters installed will void the warranty.
Filter Cleaning is an important part of dryer maintenance.
These dryers are equipped with a filter in the regeneration air loop. Regular filter cleaning will keep
your dryer operating at peak efficiency.
To Clean the Regeneration Filter:
•
•
•
Turn off and/or lock out electrical power to the dryer.
Slide the panel filter out of its housing.
Vacuum or carefully blow out the filter with compressed air. If the filter is worn or can't be
cleaned, replace it.
•
Slide the filter back into its housing.
6-5 Dirty Filter Alarm Calibration
Dryer models 350-2100 may be equipped with an optional Dirty Filter Indicator. When this indicator
lights, it is time to clean or change the filter. The Dirty Filter indicator is tested and calibrated at the
factory, but it can be adjusted in the field.
1. Be sure that your filter is clean, and use the following procedure.
2. Remove the process air return filter element from its housing.
3. Block off approximately 50% of the filter's surface area to simulate a dirty filter.
4. Reinstall the cartridge and secure the cover.
5. While the process blower is operating, adjust the trim screw on the differential pressure switch until
the alarm light just comes on.
6. Remove the restricted filter cartridge from the housing again. The alarm light should stay off when
the process blower operates if the switch is adjusted correctly.
7. Re-install the obstructed cartridge filter. The alarm light should go on again if the switch is adjusted
correctly.
8. Fine tune the switch setting so it consistently warns of a blocked filter and does not falsely indicate
a blockage of a clean filter.
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9. Remove the restriction from the filter element and re-install the clean filter. The alarm light should
remain off.
6-6 Dewpoint Control System Service
The Dewpoint Shift feature on dryer models 350 through 2100 depends on the proper operation of the
dewpoint sensor and its control board. The dewpoint sensor is in the process airstream and is therefore
susceptible to contamination.
Dewpoint sensor life is dependent on:
•
•
•
Air temperature and flow passing over the sensor.
The amount of fines [dust] in the process air.
The amount of plasticizer vapor in the process air.
The dryer operator should monitor the initial dewpoint sensor readings and establish a periodic
replacement schedule as needed.
Note: Note: Do not attempt to check the continuity or resistance of a dewpoint sensor. The
sensor will be destroyed.
If you suspect that the dewpoint readings on the dewpoint meter are incorrect, a dewpoint simulation
calibrator is available from the manufacturer [part number A0549143]. This device simulates various
dewpoint outputs. It can confirm proper operation of the dewpoint sensor and dewpoint system control
board.
To check the dewpoint sensor and dewpoint control board:
1. Remove the sensor cable from the sensor hex nut adapter.
2. Connect the cable to the plug on the rear of the simulator.
3. Turn the rotary knob on the simulator to each position and note the readings on the dewpoint meter
on the dryer's control panel. The readings should correspond within a degree or two across the
entire range.
4. If the readings agree, the control board is OK. Dewpoint sensor replacement is recommended. If the
readings do not agree, replace the control board and run the test again to rule out the possibility of a
bad sensor.
Do not attempt to make any adjustments to the components on the dewpoint control board.
5. When testing is finished, re-connect the control cable to the sensor adapter.
6-7 Symptoms of Worn Out Desiccant
The moisture adsorption capacity of the desiccant used in ACS dryers degrades after an indefinite
period of time. Useful life depends on variables such as material moisture content, plasticizer vapors in
the return air and number of regeneration cycles.
Your dryer may need new desiccant if it exhibits any of the following symptoms:
•
•
The plastic material is not being dried sufficiently (high scrap/reject rate).
The air temperature at the top of the regenerating desiccant bed rapidly climbs to 350°F or more
shortly after the start of regeneration, even though a saturated bed has just started heating.
•
•
The process air dewpoint, measured with a portable dewpoint monitor, is higher than -10°F
throughout the process drying cycle.
Smoke or dust is being blown out of the process air outlet.
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•
Noticeable amounts of desiccant in the beds is a medium-brown color, or darker.
If any of these signs are noticed, the desiccant in the desiccant beds should be replaced. Desiccant
replacement kits are available from the Parts Department. If you wish, the desiccant beds can be
repacked at your site by a technician.
WARNING
DESICCANT MATERIAL CAUSES EYE IRRITATION
BREATHING MAY BE HARMFUL/MAY CAUSE SKIN IRRITATION
; Do not get in eyes.
; Avoid prolonged contact with skin.
; Use with adequate ventilation.
; Wash thoroughly after handling.
FIRST AID:
In case of eye contact, immediately flush eyes with plenty of water for at least 15 minutes. If
irritation persists, see a physician.
6-8 Desiccant Replacement Procedure
Follow the procedure below to change the desiccant.
1. Disconnect electrical power to the dryer.
2. Remove the bolts and nuts securing the cover of each desiccant tower. Remove the covers with a
lifting fixture.
3. With a shop vacuum, carefully remove all desiccant from each tower.
4. Inspect each lower desiccant screen for tears or burn-through spots. Replace if necessary.
5. After cleaning each tower, add a level layer of half the large bead desiccant on top of the screen.
Next, carefully add the full amount specified "per bed" of small bead desiccant. Smooth the top
level, and finally add another layer of the remaining large bead desiccant to the top. Make sure this
layer is level and smooth.
6. Repeat the above step for the other bed.
7. Inspect the gasketing on each of the covers. Replace if necessary.
8. Re-install the covers.
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Figure 6: Desiccant Amounts Required
Dryer
Desiccant Required per Tower
Model
Large Bead
Small Bead
76
Total
106
106
120
120
140
140
160
160
175
175
240
240
250
250
300
300
360
360
430
430
480
480
350
350-RT
425
425-RT
500
500-RT
600
600-RT
700
700-RT
850
850-RT
1000
30
30
30
30
40
40
40
40
40
76
90
90
100
100
120
120
35
40
35
120
120
120
120
120
120
120
120
120
120
120
120
120
120
130
130
180
180
240
240
310
310
360
360
1000-RT
1250
250-RT
1500
1500-RT
1800
1800-RT
2100
2100-RT
6-9 Process Heater Replacement Procedure
ACS dryers have a number of single phase Calrod-type heater elements wired in a delta formation.
They are mounted in the vertical compartment behind the right hand desiccant tower. The number and
wattage of the heaters varies with model, voltage, temperature range, etc., but the replacement
procedure is the same.
WARNING!
Disconnect and lock out power before heater replacement.
1. Remove the bolts securing the process heater access cover.
2. Sketch the heater wiring configuration so the heaters may be re-wired properly. Heaters are
mounted on a common plate of three or six for easy maintenance.
3. Remove the jumper bars and wires for the heater plate assembly(ies) being removed or replaced.
4. Remove the bolts securing the heater plate assembly and slide out the assembly. Avoid damaging
the gasketing.
5. Remove individual heaters for replacement by removing the large brass nuts and washers.
6. Re-install the heaters and heater plate assemblies in reverse order, replacing gaskets if necessary.
Caution!
Heater loops should not touch each other. "Hot spots" will lead to premature heater
failure.
7. Re-install the jumper wires and bars according to the sketch made earlier.
8. Re-secure the process heater access cover.
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6-10 Regeneration Heater Replacement Procedure
Dryer models 350 through 2100 Dryers have four or eight three-phase regeneration heaters wired in the
wye formation mounted in the insulated box directly above the lower valve.
WARNING!
WARNING! Disconnect and lock out power before heater replacement.
1. Access the regeneration heaters from the rear of the dryer. Remove the cover plate secured by
two bolts.
3. Sketch the heater wiring configuration so the heaters may be re-assembled properly. Also, note
that the loops of the heaters are vertical to prevent drooping when hot.
4. Remove the jumper wires for the heater(s) being removed and/or replaced.
5. Remove the four bolts securing each heater's 3 1/2" mounting plate. Slide out the heater, taking
care to not damage the gasketing.
6. Re-install the new heaters in reverse order. Be sure their loops are vertical, like the original
heaters were. Securely tighten all fasteners.
Caution!
Caution! The heater loops should not touch each other. This will create "hot
spots" and lead to premature heater failure.
7. Re-install the jumper wires according to the sketch made earlier.
8. Re-secure the regeneration heater access cover.
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6-11 Restoring a Temperature Controller to the Factory Setup
If the control's pre-set parameters have been tampered with and it will no longer control, try restoring
the factory set up:
1. Turn off the power switch on the graphic display and remove all electrical power to the dryer.
2. Press up the latch at the bottom of the module's front panel and slide out the control chassis.
3. Locate the slide-type lockout switch [SW101 {PROTECT}] on the left circuit board. It should be
Off.
ON
OFF
Protect (SW101)
4. Check to make sure the control output relays are installed on the right-hand circuit board. Dryers
use one E53-S Solid State Relay (SSR) mounted in the socket marked S201 (HEAT). This relay
switches the heaters on and off.
5. Set the output selector switch SW202 to PULSE. This slide-type switch is near the control output
socket. If the dryer is equipped with an S.C.R. controller [an E53-C output module is installed], set
the switch to Current.
6. Set the rotary-type alarm mode selector switch SW203 to position 2 for upper limit alarm.
0
9
1
8
7
2
3
ON
OFF
6
4
5
Pulse -- Current
SW203
0
9
1
8
7
2
3
6
4
5
SW203
0
9
1
8
2
3
7
6
4
5
SW203
7. Set the rotary-type ALM2 switch SW203 to position 3 for lower limit alarm.
8. Set the rotary temperature sensor selector switch to position 2. It is marked SW206 (INPUT TYPE)
and is on the right circuit board. ACS Dryers are factory-equipped with type K thermocouples; 6
other temperature sensor types can be used if the switch is properly set. These are listed below.
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Display
Characters
Sensor Type
Switch
Position
Temp
Range
°C
°F
Thermocouple Type R
Thermocouple Type S
0
1
0 - 1,700
0 - 3,000
0 - 1,700
0 - 3,000
Thermocouple Type K
Thermocouple Type J
Thermocouple Type T
Thermocouple Type E
2
3
4
5
6
7
-200 to
1,300
-100 to
900
-200 to
400
-300 to
2,300
-100 to
1,600
-300 to
700
0 to 1,100
0 to 600
Platinum RTD (JIS
1981)
Platinum RTD (DIN)
-99.9 to
450.0
-99.9 to
450.0
-99.9 to
800.0
-99.9 to
800.0
Not Used
Not Used
8
9
9. Set both transmission output selector DIP switches OFF. They are marked SW207 (TRANSFER)
and are on the right circuit board on controls equipped with optional communications. See the
Communications Manual [part number A0535959].
ON
1
2
3
4
5
6
10. The function selector DIP switch [SW201 (FUNCTION)] selects 6 control modes. It is on the right
circuit board. Put this switch in the set-up configuration at right while inputting the initial control
parameters.
SW201 Set-up Configuration
1 OFF Control Mode
2 OFF Normal/Reverse Output
3 OFF Input Shift
4 OFF Temperature Sensor
Standard
5 ON
6 ON
Scale Indication
PID Constant Indication
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11. Slide the control chassis back into the control housing. The remaining parameters are set with the
keypad.
12. Ready the dryer for startup with a real or simulated load. Restore the electrical power.
13. Turn the control power on. The PV LED will display four zeros [0000] and then display the current
process air temperature.
14. Press
to page through the Level-0 control parameters. The PV LED displays codes
indicating the currently selected mode; the SV LED shows the selected parameter's current setting. Use
and
to select a setting.
15. Set the Level-0 parameters according to Figure 10.
16. Press
for at least two seconds to access the Level-1 parameters. Set them using the procedure
in the previous step.
Note: You can proceed to Level-2, but these parameters are read- only. Controls with optional communications
have user-set variables [unit address and ID] on Level-2.
17. Turn off the power switch on the graphic display and remove all electrical power to the dryer.
18. Press up the latch at the bottom of the control's front panel and slide out the control chassis.
ON
1
2
3
4
5
6
19. Set the #6 position of the DIP-type function selector switch to OFF. It is marked SW201
[FUNCTION] and is on the right circuit board. Slide the control back into the chassis.
20. Turn the control power on. The PV LED will display four zeros [0000] and seconds later display
the current process temperature.
21. Auto-tune the dryer using the procedure in Section 5-6. If the control still fails to control, call the
Service Department
.
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Figure 7: Factory Pre-Set Control Parameters
Parameter
Setting
Parameter
Description
PV
LED
Display
Dryer
SV LED
Setting
Levels
Display at Power Up
Alarm Range
10°F
10°F
Proportional Bandwidth
Reset Time
90.0
Seconds
20 Seconds
0
1
Rate Time
0°F
250°F
Lower Limit Value of
Control Range
Dead Band
1°F
Cooling Coefficient
Heating Control Period
Cooling Control Period
Shift Set Value
1.0°F
20 Seconds
5 Seconds
0°F
Control Output Variable
Temperature Sensor Type
Alarm Mode
Read Only
2
Unit Number Setting
w/Optional
Communications
Baud Rate Setting
w/Optional
Varies with
Network
Varies With
Network
Communications
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Figure 8: Process Temperature Control Error Messages
Message
Cause
Control Output
Alarm Output
With output unit
With current output unit
other than current
output unit
Input temperature
has risen beyond the
upper limit of the
temperature range
by more than 20°C
OFF during
4 mA during reverse
(heating) action, 20 mA
during normal (cooling)
action.
reverse (heating)
action, ON during
normal cooling
action.
Issues alarm
outputs in
accordance with the
set alarm mode.
[68°F] c
Input temperature
has fallen below the
lower limit of the
ON during reverse 20 mA during reverse
(heating) action,
OFF during
(heating) action, 4 mA
during normal (cooling)
action.
Issues alarm
outputs in
accordance with the
set alarm mode.
temperature range
by more than 20°C
normal (cooling)
action.
[68°F] d
The thermocouple
has burned out or
the short circuit bar
has been removed.
The platinum RTD
has burned out or A
and B have been
short circuited.
Issues alarm
outputs in
accordance with the
set alarm mode.
Proportional alarm
output is OFF
OFF
Approximately 1 mA
Memory failure
(E111) or analog to
digital converter
failure (E333) has
occurred.
Temperature
OFF
Approximately 1 mA
OFF
controller must be
repaired if recovery
is not made by
turning power off
once and on again.
[FLASHES]
c When a type J thermocouple is used, this error message is not displayed until the temperature has risen above the normal operating
temperature operating range by more than 70°C [158°F].
d When a platinum RTD sensor is used, this message is displayed when the temperature has fallen to -99.9°C [-147.82°F].
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Figure 9: Regeneration Monitor Signal Processor Error Messages
Output Status
Item
Condition
Error
Message
Corrective
Action
Compara-
tive
BCD
Output
Linear
Output
Commun-
ications
Outputs
CPU RAM
error,
external
memory
error,
Turn the power OFF
and then ON again
once. If the error
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
persists, call Service.
Device
Failure
memory
data error.
Turn the power OFF
and then ON again
once. If the error
persists, press the
mode key and set all
parameters again.
Corrupted
Data
Breakage or
short circuit of
sensor. When
the
Sensor
Error
thermocouple
is used,
terminals 11
and 13 are
not short
Check sensors for
breakage, short
circuiting, or incorrect
wiring.
OFF
OFF
OFF
OFF
circuited.
Input value
or display
Underflow value
outside
Overflow,
Display
Blinks
Continues
OVER
ON
Continues Keep the input value
Continues OVER ON and display value
within the range.
Continues
OFF
range.
Check the output type.
If correct, press the
mode key. This erases
When
output type
has
Output
Type
Change
OFF
OFF
OFF
the set the parameters,
so re-enter them. If the
problem persists, call
Service.
changed.
Turn the power OFF
and then ON again
once. If the error
Output type
other than
specified.
Output
Type Error
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
persists, call Service.
Input
Input type
other than
specified.
Turn the power OFF
and then ON again
once. If the error
Specifi-
cation
Error
persists, call Service.
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6-12 Regeneration Monitor Advanced Programming
The regeneration monitor has three menu levels, numbered 0 through 2. Each menu level allows
specific parameters to be viewed and/or set.
Moving Between Levels
Level 0, the RUN mode, is the default and automatically appears when the dryer is powered up. To
move to Level 1, press and hold
for 2 seconds. When Level 1 is reached, press and hold both
and
for 1 second to move up a level, or move back to RUN mode by pressing for 1 second.
See the flow chart below.
+
1 sec.
Press
Press
2 sec.
1 sec.
Press
+
1 sec.
Press
Press
Level 0
Level 1
Level 2
1 sec.
Comparative output settings (when security is enabled)
Output hysteresis
Sensor type
Display unit (°F/°C)
Display refresh time
Communication unit
Process temperature
Input shift value
Comparative output settings (when security is disabled)
Linear output range
Security protection
Present Value (PV)
Regen Bleed Air Temp
LEVEL 0
In this, the default level, the present regeneration
bleed air temperature is displayed, plus the
monitor’s four setpoints can be viewed and
changed.
HH Set Value
Heater Cut Off Temp
If security is enabled, the setpoints cannot be
changed. They may be reviewed by pressing
If security is disabled, the setpoints can be
.
H Set Value
changed on this level by using
and
.
Closed Loop Regen Cool Down Temp
When the desired setpoint is displayed, press
to move to the digit you want to change, and use
to change the digit. Then press
the new setting to memory and to move on to the
next setpoint.
to save
L Set Value
Regen Blower Shutdown Temp
LL Set Value
Low Regen Temp Alarm
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LEVEL 1
In this level, the four setpoints can be
Setpoints
changed, plus Hysteresis, Input Shift
and Security Protection can be set.
Use
to move from one parameter
to the next.
Hysteresis
Input Shift
When the desired parameter appears
on the LED display, press
to
select that parameter for program-
ming. The parameter’s current value
appears on the LED display.
When the desired parameter is
Security Protection
displayed, use
and/or change the parameter. Then
and
to view
press to save the new setting to
memory, and to move on to the next
parameter.
Setpoints -
When
while security lockout is enabled.
appears on the LED display, the HH, H, L, and LL setpoints can be changed even
To set the values, press
on the LED display. Use
after
and
appears. The present value for the HH setpoint will appear
to view and/or change the setpoint. Then press to save the
new setting to memory, and to move on to the next setpoint. After all setpoints are set, the LED display
returns to
.
Hysteresis -
The hysteresis value for the setpoints can range from 0° to 99° C or F.
Press
after
appears on the LED display. Use
and
to set the value. Then press
to save the new setting to memory.
Input Shift -
The input shift value can range from -99° to +99° C or F. The factory set value is “000”
The input shift value offsets the displayed temperature by the value you set here. This may be useful to
force the regeneration monitor to display the same temperature as a known [or supposed] temperature
reading.
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Press
after
appears on the LED display. Use
and
to set the value. Then press
to save the new setting to memory.
Security Protection -
When Security Protection is enabled, the setpoints can’t be changed when the Regeneration Monitor is
in “RUN” mode. The setpoints can only be changed in Level 1 using the function.
Press
after
appears on the LED display.Use
to toggle between ON and OFF. The
to save the new setting to
factory setting is “OFF”. When the selection has been made, press
memory.
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LEVEL 2
In this level, parameters such as the type of
Sensor Input Type
temperature sensor connected to the
regeneration monitor, Fahrenheit/centigrade
display, and display refresh cycle can be set.
Scale Indication °C or °F
Display Refresh Cycle
moves from one parameter to the next.
When the desired parameter appears on the
LED display, press
to select that
parameter for programming. The current
value of the parameter is then displayed on
the LED display. Use
and
to change
the setting. When you are satisfied with the new setting, press
to save the new setting to memory.
Sensor Input Type
The regeneration monitor is factory equipped with and configured to use a type K thermocouple. Type
R, S, J, L, T, U, E, and 1OO W RTD’s can also be used. The factory setting is
.
Press
after
appears on the LED display. Use
to save the new setting to memory.
to scroll through the available sensor
types. Then press
Scale Indication
The regeneration monitor can display the regeneration bleed air temperature in either Fahrenheit (°F,
the factory default) or Celsius (°C). The control is factory set to the scale indicated on the dryer at the
time of purchase.
Press
after
appears on the LED display. Use
to save the new setting to memory.
to toggle between the two choices.
Then press
Display Refresh Cycle
The regeneration monitor’s display refresh speed can be set separately from the sampling speed.
Press
after
appears on the LED display. Use
(2 seconds). Then press
to toggle between the two choices:
(500 ms) or
to save the new setting to memory. The
factory setting is
.
Note: Even if the display refresh speed is set to two seconds, the sampling times for the
setpoints still remains at 500 milliseconds.
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Chapter 7: Troubleshooting
PROBLEM
Little or no air coming from
process delivery tube.
POSSIBLE CAUSE
A. Dirty Filters
CORRECTIVE ACTION
A. Clean or replace
filters.
B.
Desiccant beds
B. Replace desiccant
contaminated by material
or plasticizer leaking into
the system. See Sec. 6-6.
C. Blower fuse(s) blown.
D. Overload tripped.
C. Fix problem and
Replace fuse(s).
D. Fix problem and reset
the overload.
E. Blower fins filled with
dust or contaminants.
E. Remove blower
sideplate, clean
baffles, replace.
Suction in delivery tube,
pressure from the return
tube.
A. Phase is reversed on A.
Stop the Dryer.
power drop coming
into the dryer.
If the dryer was connected
to the drying hopper, check
to see if the desiccant and
process air heater has
been contaminated with
resin. If so, replace the
desiccant and remove any
resin carry-over. Otherwise,
change the phase of two
legs of the three-phase
power drop. Never change
the phase at the motor
starters unless only one of
the two blowers is rotating
improperly.
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Chapter 7: Troubleshooting
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PROBLEM
Loss or reduction of
process air temperature.
POSSIBLE CAUSE
A. Process heaters are
faulty.
CORRECTIVE ACTION
A. Check for open or
shorted heaters. Replace if
required. Check the fuses.
B. Solid-state temperature B. Replace.
controller faulty.
C. Process temperature
was adjusted in error by
plant personnel.
C. Make sure that plant
personnel are aware of the
proper temperature
setpoint. A sign posted next
to the control would be
helpful.
Loss or reduction in drying A. Process heaters are
A. Replace.
capacity.
faulty.
B. Desiccant beds are
contaminated.
B. Replace desiccant.
C. Material being dried
differs from material
specified at the time of
purchase.
C. Drying systems are
designed for the material
which was originally
specified. Different
materials may need a
longer residence time or
different drying
temperature.
D. Break in flex hose
to/from drying hopper.
E. Airflow valves sticking
or failing to shift.
D. Inspect for air leaks;
replace if necessary.
E. Check for proper
operation of linear valve
actuator. Check fusing.
Repair or replace if
necessary.
F. Blower fins filled with
dust or contaminants.
F. Remove blower
sideplate, clean baffles,
replace. Replace filter
elements.
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PROBLEM
POSSIBLE CAUSE
CORRECTIVE ACTION
Material in drying hopper
A. Process temperature set A. Check resin
cakes, or meltdown occurs. too high due to operator
error.
manufacturer's data sheet
for proper drying
temperature. Make sure
plant personnel are aware
of the correct process
temperature Set Point.
B. High temperature alarm B. See Section 5-5.
not set properly.
C. Process set point is out
of acceptable range.
C. Restore temperature
controller to factory pre-
sets. Auto-Tune if
necessary. See Sec. 6-11.
Poor Dew Point
Performance.
A. Burned out regeneration A. Repair or replace.
heater.
B. Contaminated or worn
out desiccant.
B. Replace.
C. Leaking process air
hoses.
C. Repair or replace.
D. Dryer is being operated
beyond its capacity.
E. Bad dew point sensor.
F. Fouled dew point
sensor manifold.
D. Check dryer and drying
hopper sizing.
E. Replace.
F. Clear obstruction. Air
should flow freely through
sensor.
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Chapter 8: Appendix
8-1 Returned Material Policy
Credit Returns
Prior to the return of any material, authorization must be given by the manufacturer. A RMS number
will be assigned for the equipment to be returned.
Reason for requesting the return must be given.
All returned material purchased from the manufacturer is subject to a 15% ($75.00 minimum)
restocking charge.
All returns are to be shipped prepaid.
The invoice number and date or purchase order number and date must be supplied.
No credit will be issued for material that is not within the manufacturer’s warranty period and/or in new
and unused condition, suitable for resale.
Warranty Returns
Prior to the return of any material, authorization must be given by the manufacturer. A RMS number
will be assigned for the equipment to be returned.
Reason for requesting the return must be given.
All returns are to be shipped prepaid.
The invoice number and date or purchase order number and date must be supplied.
After inspecting the material, a replacement or credit will be given, at the manufacturer’s discretion, if
the item is found to be defective in materials or workmanship. Purchased components are covered
under their specific warranty terms.
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Chapter 8: Appendix
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-Notes-
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Preventive Maintenance Checklist
Dehumidifying Dryers
Dryer Model #
Serial #
Date/ Date/ Date/ Date/ Date/ Date/ Date/ Date/ Date/ Date/ Date/ Date/ Date/
By By By By By By By By By By By By By
EVERY WEEK
Inspect all filters for wear,
replace/clean if dirty or
worn
Check air regulator to
make sure pressure is 60-
80 psi. [If applicable]
EVERY MONTH Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Lock out electrical power
and inspect electrical
wiring for integrity
Lock out electrical power
and check heater
elements for continuity
using an ohmmeter
Check Dew point and
temperature tracking with
an external dew point
monitor and pyrometer
Visually inspect the
shifting of the airflow
valve
during one cycle
Next Scheduled
Inspection
Actual Inspection
Date/By
Next Scheduled
Inspection
Actual Inspection
Date/By
EVERY YEAR
Inspect desiccant. Replace
if brown or broken
Scheduled
Replacement Date
Actual Replacement
Date/Work Done By
Scheduled
Replacement Date
Actual Replacement
Date/Work Done By
EVERY 2 YEARS
Replace desiccant
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Chapter 8: Appendix
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8-2 Technical Assistance
Parts Department
[
]
[
]
Call toll-free 7am–5pm CST 800 423-3183 or call 262 641-8610 Fax: [262] 641-8653
The ACS Customer Service Group will provide your company with genuine OEM quality parts manufactured to
engineering design specifications, which will maximize your equipment’s performance and efficiency. To assist in
expediting your phone or fax order, please have the model and serial number of your unit when you contact us. A
customer replacement parts list is included in this manual for your convenience. ACS welcomes inquiries on all
your parts needs and is dedicated to providing excellent customer service.
Service Department
[
]
[
]
Call toll-free 8am–5pm CST 800 423-3183 or call 262 641-8610
[
]
Emergencies after 5pm CST, call 847 439-5655
We have a qualified service department ready to help. Service contracts are available for most products. Service
contracts are available for most of our products.
Sales Department
[
]
Call 262 641-8610 Monday–Friday, 8am–5pm CST
Our products are sold by a world-wide network of independent sales representatives. Contact our Sales
Department for the name of the sales representative nearest you.
Contract Department
[
]
Call 262 641-8610 Monday–Friday, 8am–5pm CST
Let us install your system. The Contract Department offers any or all of these services: project planning; system
packages including drawings; equipment, labor, and construction materials; and union or non-union installations.
Sterling, Inc.
2900 S. 160th Street
New Berlin, WI 53151
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