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Section VIII - Power$ync II
™
Operation
Quincy Compressor
®
- QSD™ 63
The Power$ync II
™
controller also performs continuing
checks on itself while the compressor is in operation. If
it detects a fault, it will display one of the following two
messages:
NOTICE!
COMPRESSOR HAS SHUT DOWN
**NOTICE** COMMUNICATION FAILURE
REFER TO YOUR SERVICE MANUAL
The Power$ync II
™
controller continually checks
its communication pathways between boards, even
when no pertinent information is being passed.
This is done to confirm that all communication
pathways are functioning and ready to accept and
process signals. If the controller fails to receive
the proper response to its attempt to confirm that
the communication pathways are functioning
properly, it will try two more times and then shut
the compressor down. Call your local service
representative to correct this problem. The
compressor can be operated in Back-up Mode.
PKG. DISCH TEMP_______
COMPRESSOR HAS SHUT DOWN
**NOTICE** HIGH DISCHARGE TEMPERATURE
TAKE CORRECTIVE ACTION
This display indicates that the controller has
detected a high temperature condition at the
temperature probe installed in the discharge line
from the package to the plant air. This could be
the result of a mechanical failure or it could be
the result of low coolant flow. This is a serious
condition. Do not attempt to restart the
compressor until the cause of the shutdown has
been determined and corrected. The compressor
will not restart as long as the high temperature
condition exists. Call your service representative
if you cannot determine and correct the cause of
the shutdown.
Power$ync II
™
is connected to and monitors the state of
the motor starter and overload. Should the controller
detect a fault condition or detect that a component is not
responding to commands, it will illuminate the
appropriate LED on the schematic and display one of the
following messages:
2 INLET TEMP ______
COMPRESSOR HAS SHUT DOWN
NOTICE! HIGH STAGE 2 INLET TEMP
TAKE CORRECTIVE ACTION
2 DISCH TEMP ______
COMPRESSOR HAS SHUT DOWN
NOTICE! HIGH STAGE 2 DISCH TEMP
TAKE CORRECTIVE ACTION
1 DISCH TEMP ______
COMPRESSOR HAS SHUT DOWN
NOTICE! HIGH STAGE 1 DISCH TEMP
TAKE CORRECTIVE ACTION
High temperature shutdowns could be caused by
high ambient temperatures. Verify that the ambient
temperature is within the operating limits of the
compressor. A failed or broken vent fan could
also cause high temperatures. For water-cooled
units, the water temperature or flow might be
outside the operating limits of the compressor or
the cooler might need cleaning. For air-cooled
units, the air flow might be blocked, the fan or fan
motor may have failed, the thermal mixing valve
may have failed or the cooler may need cleaning.
High Stage 2 discharge temperature can be caused
by a high delta-pressure across stage 2. This could
be caused by a blowdown valve failure.
FLUID PRESSURE ______
COMPRESSOR HAS SHUT DOWN
NOTICE! LOW FLUID PRESSURE
TAKE CORRECTIVE ACTION
Low fluid pressure may be caused by a failed fluid
pump or regulating valve.