Quincy Compressor QSD 65040-AB Instruction Manual page 15

Back-up Control
™ ™
The QSD Power$ync II
back-up control for emergency operations if the
electronic control is inoperative. The Back-up Mode is a
simplified system of operations and is not intended for
long-term operation. When Back-up Mode is selected all
power is removed from the Power$ync II
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.
CAUTION
!
Under no condition should the QSD
from Power$ync II to Back-up Mode or vice versa
without first removing all power to the unit.
CAUTION
!
Always inspect for component failure before
operating in Back-up Mode. Operating the unit
with faulty components may void warranty.
controller is supplied with a
™
controls, thus
™
be switched
Quincy Compressor
Section II - Description
Shutdown Conditions
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).
WARNING
!
High voltage could cause death or serious injury.
Disconnect all power supplies before opening the
electrical enclosure or servicing.
®
- QSD™
NOTE
13