AEC ACM Series Operation And Installation Manual page 56

Problem
Material in drying hopper cakes,
or meltdown occurs.
Poor dew point performance.
Nothing displays when the
controller is turned on.
No setting change possible on
temperature controller.
Page 56
Possible cause
Process temperature set too
high due to operator error.
High temperature alarm not set
properly.
Process set point is out of
acceptable range.
Function set for degrees Celsius
(ºC), set point at degrees
Fahrenheit (ºF).
Process thermocouple not in
airflow.
Burned out regeneration heater.
Leaking process air hoses.
Dryer operates beyond its
capacity.
Bad dew point sensor.
Fouled dew point sensor
manifold.
Coalescing filter saturated.
Large particle filter dirty.
Membrane contaminated.
The internal mechanism is not
inserted properly into the
housing.
The power supply is not
connected to its terminals
properly.
No power is supplied, or the
supplied power is not within the
specified range.
Disconnect switch or Control
Power switch not set to ON.
Control Power fuse blown.
The key protection switch is set
to ON.
Corrective action
Check resin manufacturer's data
sheet for proper drying
temperature. Make sure plant
personnel are aware of the
correct process temperature set
point.
Reset high temperature alarm.
Restore temperature controller
to factory pre-sets.
Verify correct Celsius or
Fahrenheit settings.
Verify that the thermocouple is
properly installed in the inlet
tube.
Repair or replace.
Repair or replace.
Check dryer and drying hopper
sizing.
Replace.
Clear obstruction. Air should
flow freely through sensor.
Replace with new element.
Remove and clean.
Replace.
Properly insert the internal
mechanism into the housing.
Properly connect the power
supply to the power supply
terminals.
Supply a voltage of 85 to 125
VAC to the power supply
terminals of the controller.
Check control power fuse for
continuity. Turn disconnect
switch and control power switch
ON.
Set the key protection switch to
OFF.
ACM Series Dehumidifying Dryers