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Section VIII - Power$ync II
™
Operation
Quincy Compressor
®
- QSD™ 67
MOTOR OVERLOAD
The control monitors the status of the main motor
and fan motor overloads. Should one of the
overloads detect an amp draw that is too high, it
will shut the compressor down and the control will
log the event.
CONTACTOR WELDED
The control monitors the status of the motor
starters during compressor operation. If the
control sends a signal to the starter to disengage
and it does not receive confirmation of this, is will
trip an alarm and log this message. This may
indicate a failed contactor or it may indicate a
fault in the wiring to the auxiliary contacts.
WYE CONTACTOR NOT CLOSED
This message will be logged if the control sends a
start signal to the Y-D contactor motor starter and
fails to receive confirmation that the contactor
engaged.
M1 AUX CONTACT OPENED
This message will be logged if the controller
detected that the auxiliary contacts on the main
contactor opened up, when they should be closed.
This could indicate a loose wire, or chattering
contactor.
WYE AUX CONTACT CLOSED
This message is logged in Y-D starter
configurations, when the controller sees an input
from the auxiliary contacts when they should be
open.
CONTACTOR FAILURE
This message will be logged if the control sends a
start signal to the main and/or fan motor starter
and fails to receive confirmation that the contactor
engaged.
COMM TO RELAY BD FAILS
This indicates that communication between the
microprocessor board and the relay board has
been interrupted.
PKG DISCHARGE RTD FAILURE
The package discharge RTD is the temperature
probe between the compressor package and the
system lines. The control will log this message if
it fails to receive a valid signal from this probe.