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SMD Series Dehumidifying Dryers Page 53
Troubleshooting 9
Problem Possible cause Corrective action
Process heaters are faulty.
Check for open heaters.
Replace if required.
Solid-state temperature
controller faulty.
Replace.
Loss or reduction of process air
temperature.
Process temperature was
adjusted in error by plant
personnel.
Make sure that plant personnel
are aware of the proper
temperature set point. Post an
appropriate sign next to the
controller.
Process heaters are faulty. Replace.
Material being dried differs from
material specified at the time of
purchase.
Drying systems are designed for
the material which was originally
specified. Different materials
may need a longer residence
time or a different drying
temperature.
Loss or reduction in drying
capacity.
Break in flex hose to drying
hopper.
Inspect for air leaks; replace as
needed.
Insufficient power to PLC
(Power LED is off).
Check power supply and power
wiring to PLC.
PLC Regeneration Bed LED
indicators both off.
Faulty PLC (PLC Power light is
on, Run light is off, and/or Error
light is on).
Replace PLC.
Process air in high-temperature
condition.
None.
Insufficient power to PLC
(Power light is off).
Check power supply and power
wiring to PLC.
PLC Regeneration Heater
Left/Right output indicators both
off.
Faulty PLC (PLC Power light is
on, Run light is off, and/or Error
light is on).
Replace PLC.