LCSSS – Phase Rotation
The Liquid Cooled Solid State Starter Logic/Trigger Board has detected the three phase compressor
motor power line voltage phase rotation is not correct. The chiller can be started after the phase
rotation is correct and the Clear Fault key is pressed on the display.
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 contained 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 over the serial link. Since serial
communications are initiated every 2 seconds, this message is typically 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 potentiometer on the VSD
Logic Board. The chiller can be started after the RESET push-button on the VSD Logic Board is
pressed and the Clear Fault key is pressed on the display.
VSD – High Phase A Inverter Heatsink Temperature
(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 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 running, 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 Clear Fault key is pressed on the display.
VSD – High Phase B Inverter Heatsink Temperature
(Style D VSD)
See
VSD – High Phase A Inverter Heatsink Temperature
message above.
VSD – High Phase C Inverter Heatsink Temperature
(Style D VSD)
See
VSD – High Phase A Inverter Heatsink Temperature
message above.
VSD – High Converter Heatsink Temperature
(Style D VSD)
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
192
