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Section VIII - Power$ync II
™
Operation
62 Quincy Compressor
®
- QSD™
A potentially serious condition could exist if the main
motor starter does not respond to the controller’s signal to
disengage. The cooling fan motor will not stop as long as
the main motor is running so that cooling can be
maintained in the event that the starter does not respond
to a signal to perform a normal shutdown. If the starter
does not respond to a signal to disengage in an
emergency, an unsafe condition may result. The
Power$ync II
™
controller will flash all the LED safety
and warning lights to draw attention to this situation,
should it occur. It will also display one of the following
messages, depending on the unit configuration:
NOTICE! *********
NOTICE!
COMPRESSOR MAIN CONTACTOR
IS NOT DISENGAGING
PULL MAIN DISCONNECT
NOTICE!
REMOTE STARTER
IS NOT DISENGAGING
PULL MAIN DISCONNECT
Pull the main disconnect to cut the power to the
compressor. Determine the reason that the starter
is not responding, correct the problem and repeat
the start-up procedure. As with other faults, loose
wiring should be the first item checked. If all
wiring to and from the relay board is tight and
wiring to the starter auxiliary contacts is tight, a
faulty starter may be the problem. Determine the
original cause for the shutdown. If the unit was
being stopped because there was no air demand,
it can be restarted after the starter problem is
corrected. If the unit was being stopped due to a
detected fault, correct the fault before continuing
operation. Do not attempt to run the compressor
in Back-up Mode until all faults have been
corrected.
In addition to the sensor check at power-up, the
Power$ync II
™
controller continually checks sensors for
faults. If the controller receives a signal that is outside its
expected range or fails to receive a signal, one of the
following messages will be displayed depending on the
sensor affected:
NOTICE!
COMPRESSOR HAS SHUT DOWN
DISCHARGE RTD FAULTY OR DISCONNECTED
REFER TO YOUR SERVICE MANUAL
NOTICE!
COMPRESSOR HAS SHUT DOWN
STG 2 OUT RTD FAULTY OR DISCONNECTED
REFER TO YOUR SERVICE MANUAL
NOTICE!
COMPRESSOR HAS SHUT DOWN
STG 2 IN RTD FAULTY OR DISCONNECTED
REFER TO YOUR SERVICE MANUAL
NOTICE!
COMPRESSOR HAS SHUT DOWN
STG 1 OUT RTD FAULTY OR DISCONNECTED
REFER TO YOUR SERVICE MANUAL
NOTICE!
COMPRESSOR HAS SHUT DOWN
PACKAGE PRESSURE SENSOR FAULTY
REFER TO YOUR SERVICE MANUAL
NOTICE!
COMPRESSOR HAS SHUT DOWN
STG 2 OUT PRESSURE SENSOR FAULTY
REFER TO YOUR SERVICE MANUAL
NOTICE!
COMPRESSOR HAS SHUT DOWN
FLUID PRESSURE SENSOR FAULTY
REFER TO YOUR SERVICE MANUAL
NOTICE!
COMPRESSOR HAS SHUT DOWN
STG 1 OUT PRESSURE SENSOR FAULTY
REFER TO YOUR SERVICE MANUAL
There are two probable causes for these displays:
a disconnected wire or a failed sensor or
transducer. Disconnect the main power supply to
the compressor and check the connection at the
temperature probe and at the controller. If a loose
connection is found, correct the problem and
repeat the start-up procedure. If all connections
are tight, the problem is a failed sensor or
transducer. If a spare part is available, replace
and repeat the start-up process. If no spare part
is available, contact a service representative. The
compressor can be operated in Back-up Mode.