York YK Style H Operation Manual page 182

Board within 5 seconds, a shutdown is performed and this message is displayed. This is generally
indicative of a wiring problem between the Control Center and the VSD.
VSD – Serial Communications
This message is generated when communications between the Control Center Microboard and the
VSD Logic Board, is disrupted. This is generally indicative of defective wiring between the VSD Logic
Board and the Control Center Microboard.
Harmonic Filter – Logic Board or Communications
This message is generated when communications between the Harmonic Filter and the VSD Logic
Board, is disrupted for 10 continuous communications cycles (20 seconds) causing this shutdown to
occur.
Harmonic Filter – High DC Bus Voltage
The Harmonic Filter's DC Link Voltage is continuously monitored and if the level exceeds 860 VDC,
this shutdown is performed. The Harmonic Filter has its own DC bus as part of the filter power
assembly, and this DC Link is not connected in any way with the VSD's DC link. If this shutdown
occurs, it will be necessary to look at the level of 460 VAC applied to the Harmonic Filter. The
specified voltage range is 414 to 508. If the incoming voltage is in excess of 508, steps should be
taken to reduce the level to within specified limits. The cause of this message is typically high line
voltage or a surge on the utility supply.
Harmonic Filter – High Phase A Current
The maximum instantaneous Harmonic Filter current is monitored and compared to a preset limit.
If this limit is exceeded, a shutdown is performed and this message is generated. The filter current
is monitored using two DCCT's and these signals are processed by the Filter Logic Board. The
preset limits are as follows:
• 351/292 HP equals 356 Amps
• 503/419 HP equals 496 Amps
• 790/658 HP equals 745 Amps
• 1048/917 HP equals 385 Amps
If the VSD automatically restarts after this shutdown and continues to operate properly with the
filter operating, it is likely the filter tripped due to a sag or surge in the voltage feeding the VSD. If
this message reoccurs, preventing the chiller from starting, the VSD will require service.
Harmonic Filter – High Phase B Current
See Harmonic Filter – High Phase A Current message above.
Harmonic Filter – High Phase C Current
See Harmonic Filter – High Phase A Current message above.
Harmonic Filter – Phase Locked Loop
This shutdown indicates that a circuit called Phase Locked Loop on the Filter Logic Board has lost
synchronization with the incoming power line. This is usually indicative of an open fuse in one of
the filter's incoming power line. Filter power fuses 11FU, 12FU and 13FU should be checked.
Harmonic Filter – Precharge – Low DC Bus Voltage
During pre-charge, the Filter's DC link must be equal to or greater than 50 VDC (41 VDC for 50 Hz)
within 1/10 second after the pre-charge relay is energized. If this condition is not met, a shutdown
is performed and this message is generated.
182 Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center