Open Or Shorted Heater; Blown Fuse, Ac Conditioning Board - ABB PGC2000 Operation And Service Manual

See "AIR PURGING" in Section 4 for the override function. Do not perform
override until you have read Section 4 completely and you understand and can
perform the procedure requirements.
The temperature controllers must be stable with respect to tracking the set point.
Symptom: The actual temperature is not stabilizing at the set point temperature. This alarm occurs
when the zone temperature has remained outside the operational band of the set point for more than
90 seconds.
Any one of the following alarm messages or conditions could be present:
On Background Screen
On Manual Temperature
Control Mode Screen
On Alarm Screen
1. Check to ensure proper sufficient heater air flow
2. Perform Test Procedure 21 (Open Temperature Sensor), steps 1-3, to check probe for stability.
If not stable replace probe.
3. Replace applicable zone board. Check for stability.
4. Replace AC Conditioning board. Check for stability.

Open or Shorted Heater

Symptom: No heat to a specific temperature zone. Actual temperature is ambient, while set point is
at normal setting. The analyzer may indicate out of control or low temperature alarm.
Failure: The temperature controller and sensor input and heater output control board are functioning
normally. An open heater will not supply heat to the temperature zone.
Cause: The heater to the temperature zone is possibly open. Perform Test Procedure 26 (Open or
Shorted Heater).

Blown Fuse, AC Conditioning Board

Symptom: No heat to any temperature zone.
Failure: All temperature zone outputs share a common fuse.
Cause: Open fuse causes power to be removed from zone heaters. The analyzer may indicate an
out of control or low temperature alarm. Perform Test Procedure 27 (Open Fuse to AC Conditioning
Board).
6-20
CAUTION
***ALARM:*** (flashing)
Zone (#) (flashing)
*Temp Bd Alarm* (flashing)
Temperature Board:
*Zone Specific
*** TEMP ZONE (#) Alarm ***
*Out of Control
2000-OSM, F1