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Problem
Process value is abnormal or
not obtained.
Determining Temperature Controller Errors or Sensor Errors
Using a Thermocouple
Using a Platinum Resistance Thermometer
Other service problems or questions can be answered by contacting
ACM Series Dehumidifying Dryers
Possible cause
Input polarity on thermo-couple
is wrong or connection is wrong.
Input-type setting is incorrect.
No compensating lead wires
used for extension of the
thermocouple.
Thermocouple and controller are
connected by wires other than
proper lead wires.
Process thermocouple not in
airflow.
Sensor is broken or short-
circuited.
The controller is influenced by
noise or other induction.
Celsius temperatures used
instead of Fahrenheit or vice
versa.
Process value shifted because
the input shift function is used.
If the controller displays a temperature that is close to room
temperature (70ºF/21ºC) when you short-circuit controller input
terminals, the controller is normal and the sensor is probably
broken, short-circuited, or incorrectly wired.
If the controller displays a temperature of about 0.0°C (32ºF) when
you insert a 100-ohm resistor between terminals
controller, and you short-circuit controller terminals
, the controller is normal and the sensor is probably broken,
–B
short-circuited, or incorrectly wired.
the AEC Service Department.
Corrective action
Properly wire the terminals.
Properly set the input with the
input-type selector rotary switch.
Use proper compensating lead
wires and terminals.
Use a dedicated thermocouple
connector. If a connector is a
metal different from the
thermocouple and controller, a
temperature error may result.
Verify that the thermocouple is
properly installed in the inlet
tube.
Replace with a good sensor.
Separate input wires as far as
possible from the origin of the
noise.
Check Mode selector switch 6:
• ON - ºF
• OFF - ºC
Set input shift value to 0, or set
mode selector switch 4 to OFF.
and
A
–B
and
+B
of the
Page 57
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