Loss Of Air; Triac Failure - ABB PGC2000 Operation And Service Manual

Any one of the following alarm messages or conditions could be present:
On Background Screen
On Manual Temperature
Control Mode Screen
On Alarm Screen
Failure: The failure is most likely isolated to the zone indicating a temperature greater than 500
degrees.
Cause: The sensor to the zone input for temperature monitoring has possibly opened, or is no longer
connected. Perform Test Procedure 25 (Zone Input Sensor Open).

Loss of Air

Symptom: The isothermal oven (zone # 1) and programmed temperature oven (zone #2) are not
being heated. The actual temperature reduces and eventually approaches ambient. These are the
only temperature controllers that use air baths.
Any one of the following alarm messages or conditions could be present:
On Background Screen
On Manual Temperature
Control Mode Screen
On Alarm Screen
Failure: Malfunction is related to application of oven air to air bath ovens. The air bath heater(s) will
overheat and burn out if air is not applied to the heaters while power is applied. The air provides the
heat to ovens by displacing heat from the heaters. The presence or lack of oven air is sensed by a
pressure switch. If air is removed, the switch opens and power is removed from the air bath heaters.
When air is applied the switch closes allowing the temperature controller to apply heat to the air bath
heaters.
Cause: The oven air has been shut off or reduced below air pressure switch setting. The oven loss
of air pressure switch has failed or connection problem exists. Perform Test Procedure 23 (Loss of
Oven Air).

Triac Failure

Symptom: The Actual temperature is indicating below set point for zone and alarm is indicating triac
failure.
Any one of the following alarm messages or conditions could be present:
On Background Screen
6-14
***ALARM:*** (flashing)
Zone (#) (flashing)
*Temp Bd Alarm* (flashing)
Temperature Board:
*Zone Specific
*Analysis Shutdown
*** TEMP ZONE (#) Alarm ***
*Overtemp
*Reasonableness Test
*Probe Open/Shorted or TC Faulty
***ALARM:*** (flashing)
*Temp Bd Alarm* (flashing)
Temperature Board:
*Loss of Air
***ALARM:*** (flashing)
2000-OSM, F1