York YK-EP Operation And Maintenance Manual page 201

LCSSS – Phase Locked Loop
The Liquid Cooled Solid State Starter Logic/Trigger Board phase locked loop circuit was not able to
maintain lock with phase A of the power line. This could be caused by a power line anomaly such
as sag or jitter. A power line frequency jitter of up to 3 Hz/second can be tolerated. The chiller will
automatically restart when lock has resumed.
LCSSS – Low Supply Line Voltage
The Liquid Cooled Solid State Starter Logic/Trigger Board has detected that the compressor motor
AC Power Line Voltage, in any phase, decreased below the low line voltage threshold continuously
for 20 seconds. The chiller will automatically restart when the voltage in all phases returns to the
restart level. The thresholds are as follows:
Table 203: Voltage thresholds
Supply voltage
range (Volts)
Disabled
200-208
220-240
380
400
415
440-480
550-600
LCSSS – High Supply Line Voltage
The Liquid Cooled Solid State Starter Logic/Trigger Board has detected that the compressor motor
AC Power Line Voltage, in any phase, exceeded the high line voltage threshold continuously for 20
seconds. The chiller will automatically restart when the voltage in all phases returns to the restart
level. The thresholds are as follows:
Table 204: Voltage thresholds
Supply voltage
range (Volts)
Disabled
200-208
220-240
380
400
415
440-480
550-600
LCSSS – Logic Board Processor
Communication between the V25 Microprocessor and Digital Signal Processor (DSP) on the Liquid
Cooled Solid State Starter Logic/Trigger Board has been interrupted. The chiller will automatically
restart when communications are restored.
YK-EP Style B Centrifugal Chiller
Shutdown (Volts)
None
160
185
305
320
335
370
460
Shutdown (Volts)
None
227
262
415
436
454
524
655
Restart (Volts)
N/A
174
200
331
349
362
400
502
Restart (Volts)
N/A
226
261
414
435
453
523
654
201