Compressor Motor Variable Speed Drive: Safety Shutdown Messages - Johnson Controls YORK YK Style G OPTIVIEW Operation And Maintenance

FORM 160.54-O1
ISSUE DATE: 9/10/2014
COMPRESSOR MOTOR VARIABLE SPEED
DRIVE: SAFETY SHUTDOWN MESSAGES
The following safety shutdown messages are displayed
on Compressor Motor Variable Speed Drive (VSD)
applications only. These messages are generated by
events that occur within the VSD. The chiller can be
started after manual resets are performed as detailed
below. Service and troubleshooting information is con-
tained in Variable Speed Drive – Service Instructions
(Form 160.00-M1).
VSD Shutdown – Requesting Fault Data
The VSD has shut down the chiller and the Control
Center has not yet received the cause of the fault from
the VSD, via the serial communications link. The VSD
shuts down the chiller by opening the Motor Controller
VSD Stop Contacts (located on the VSD Logic Board
and connected between TB6-16 and TB6-53 in the
Control Center). The Microboard in the Control Center
then sends a request for the cause of the fault to the
VSD Logic Board via the Adaptive Capacity Control
Board, over the serial link. Since serial communica-
tions are initiated every 2 seconds, this message is typ-
ically displayed for a few seconds and then replaced
with one of the following fault messages.
VSD – 105% Motor Current Overload
This shutdown is generated by the VSD Logic Board
and it indicates that a motor overload has occurred. The
shutdown is generated when the VSD Logic Board has
detected that at least 1 of the 3 output phase currents
has exceeded 105% of the chiller Full Load Amps
(FLA) value for greater than 7 seconds. The chiller
FLA value is set by adjustment of the FLA potentiome-
ter on the VSD Logic Board. The chiller can be started
after the RESET push-button on the VSD Logic Board
is pressed and the Compressor Switch is placed in the
Stop-Reset (O) position.
VSD – High Phase A Inverter Heatsink Tem-
perature
(Style D VSD)
This shutdown will occur if the heatsink temperature
exceeds 158°F on any of the output pole assemblies.
This shutdown will seldom occur. In most cases where
the coolant temperature has risen abnormally, the VSD
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
will shut down on Ambient Temperature @ 140.0°F
before the heatsinks can reach 158°F. If this message
is displayed, make sure there is adequate coolant level,
ascertain the pump is operating when the chiller is run-
ning, and check the strainer in the primary of the heat
exchanger for clogs and silt. The chiller can be started
after the fault condition clears, the RESET button on
the VSD Logic Board is pressed and the Compressor
Switch is placed in the Stop-Reset (O) position.
VSD – High Phase B Inverter Heatsink
Temperature
(Style D VSD)
See PHASE A message above.
VSD – High Phase C Inverter Heatsink
Temperature
(Style D VSD)
See PHASE A message above.
VSD – High Converter Heatsink Temperature
(Style D VSD)
See PHASE A message above.
VSD – High Converter Heatsink Temperature
(Applicable to VSD with Part Number 371-02767-
XXX (60Hz) and 371-03700-XXX (50Hz))
(If compressor other than "P", requires Flash Memory
Card version C.MLM.01.05A.xxx and later)
This shutdown will occur if the heatsink temperature
exceeds 170°F. The chiller can be started after the fault
condition clears and the Compressor Switch is placed
in the Stop-Reset (O) position.
VSD – High Inverter Baseplate Temperature
(Applicable to VSD with Part Number 371-02767-
XXX (60Hz) and 371-03700-XXX (50Hz))
(If compressor other than "P", requires Flash Memory
Card version C.MLM.01.05A.xxx and later)
This shutdown will occur if the baseplate temperature
exceeds 175°F. The chiller can be started after the fault
condition clears, the RESET button on the VSD Logic
Board is pressed and the Compressor Switch is placed
in the Stop-Reset (O) position.
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