AEC AD Series - Page 65

AD Series Dehumidifying Dryers Page 65
Problem Possible cause Corrective action
Fouled dew point sensor
manifold.
Clear obstruction. Air should
flow freely through sensor.
Poor dew point performance
(cont’d.).
Dirty filter. Clean or replace filter element.
The internal mechanism is not
inserted properly into the
housing.
Properly insert the internal
mechanism into the housing.
The power supply is not
connected to its terminals
properly.
Properly connect the power
supply to the power supply
terminals.
No power is supplied, or the
supplied power is not within the
specified range.
Supply a voltage of 85 to 125
VAC to the power supply
terminals of the controller.
Nothing displays when the
controller is turned on.
Disconnect switch or Control
Power switch not set to ON.
Control Power fuse blown.
Check control power fuse for
continuity. Turn disconnect
switch and control power switch
ON.
No setting change possible on
temperature controller.
The key protection switch is set
to ON.
Set the key protection switch to
OFF.
Input polarity on thermo-couple
is wrong or connection is wrong.
Properly wire the terminals.
Input-type setting is incorrect.
Properly set the input with the
input-type selector rotary switch.
No compensating lead wires
used for extension of the
thermocouple.
Use proper compensating lead
wires and terminals.
Thermocouple and controller are
connected by wires other than
proper lead wires.
Use a dedicated thermocouple
connector. If a connector is a
metal different from the
thermocouple and controller, a
temperature error may result.
Process thermocouple not in
airflow.
Verify that the thermocouple is
properly installed in the inlet
tube.
Sensor is broken or short-
circuited.
Replace with a good sensor.
The controller is influenced by
noise or other induction.
Separate input wires as far as
possible from the origin of the
noise.
Celsius temperatures used
instead of Fahrenheit or vice
versa.
Check Mode selector switch 6:
• ON - ºF
• OFF - ºC
Process value is abnormal or
not obtained.
Process value shifted because
the input shift function is used.
Set input shift value to 0, or set
mode selector switch 4 to OFF.