Troubleshooting - AEC ACM Series Operation And Installation Manual

Troubleshooting

Problem
Loss or reduction of process air
temperature.
Loss or reduction in drying
capacity.
PLC Regeneration Bed LED
indicators both off.
PLC Regeneration Heater
Left/Right output indicators both
off.
ACM Series Dehumidifying Dryers
Possible cause
Process heaters are faulty.
Solid-state temperature
controller faulty.
Process temperature was
adjusted in error by plant
personnel.
Process heaters are faulty.
Material being dried differs from
material specified at the time of
purchase.
Break in flex hose to/from drying
hopper.
Insufficient power to PLC
(Power LED is off).
Faulty PLC (PLC Power light is
on, Run light is off, and/or Error
light is on).
Regenerating bed cooldown.
Blower Input indicator is off.
Process air in high-temperature
condition.
Insufficient power to PLC
(Power light is off).
Faulty PLC (PLC Power light is
on, Run light is off, and/or Error
light is on).
Corrective action
Check for open heaters.
Replace if required.
Replace.
Make sure that plant personnel
are aware of the proper
temperature set point. Post an
appropriate sign next to the
controller.
Replace.
Drying systems are designed for
the material which was originally
specified. Different materials
may need a longer residence
time or a different drying
temperature.
Inspect for air leaks; replace as
needed.
Check power supply and power
wiring to PLC.
Replace PLC.
None.
Verify that blower contactor is
on. Check input wiring to PLC.
None.
Check power supply and power
wiring to PLC.
Replace PLC.
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