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Section II - Description
Quincy Compressor
®
- QSD™ 13
Back-up Control
The QSD
™
Power$ync II
™
controller is supplied with a
back-up control for emergency operations if the
electronic control is inoperative. The Back-up Mode is a
simplified system of operations and is not intended for
long-term operation. When Back-up Mode is selected all
power is removed from the Power$ync II
™
controls, thus
the indicator lights located on the annunciator panel will
be inoperable. The back-up control uses a PLC for the
logic circuit. In the Back-up Mode, the PLC monitors
several different areas of the unit to ensure they are in the
proper ranges for normal operation.
Under no condition should the QSD
™
be switched
from Power$ync II to Back-up Mode or vice versa
without first removing all power to the unit.
Always inspect for component failure before
operating in Back-up Mode. Operating the unit
with faulty components may void warranty.
Shutdown Conditions
NOTE
If one of the following conditions occurs at any
time the unit will immediately shutdown. The unit
should not be restarted until the problem has been
corrected.
• The fluid pressure does not reach 15 PSI within five
(5) seconds at start-up or does not maintain pressure
during normal operation.
• The HAT’s are open at start-up or at any time during
operation.
• The drive or fan contactor overloads trip.
• The coolant flow switch does not close within five
(5) seconds after start-up.
• The interstage pressure switch does not open within
five (5) seconds after start-up (Back-up Mode only).
• The second stage pressure switch does not open
within five (5) seconds after start-up (Back-up Mode
only).
• Both the interstage and second stage pressure
switches are open at start-up (Back-up Mode only).
• The second stage pressure switch does not close
within five (5) seconds after the load/unload pressure
switch opens and does not reopen within five (5)
seconds after the load/unload pressure switch closes
(Back-up Mode only).
High voltage could cause death or serious injury.
Disconnect all power supplies before opening the
electrical enclosure or servicing.
!
CAUTION
!
CAUTION
!
WARNING