York YK Style H Operation Manual page 181

VSD – Low Phase B Inverter Heatsink Temperature
(Style D VSD)
See VSD – Low Phase A Inverter Heatsink Temperature message above.
VSD – Low Phase C Inverter Heatsink Temperature
(Style D VSD)
See VSD – Low Phase A Inverter Heatsink Temperature message above.
VSD – Low Converter Heatsink Temperature
If VSD part number is 371-02767-XXX (60 Hz) or 371-03700-XXX (50 Hz), a heatsink temperature
sensor indicating a temperature of less than 37°F will cause the chiller to shutdown and display
this message. In most cases, the problem will be an open transmitter or broken wiring to the
transmitter. The normal transmitter resistance is 10K ohms at 77°F.
VSD – Low Phase A Inverter Baseplate Temperature
(VSD part number 371-03789-xxx (503 HP 60 Hz; 419 HP 50 Hz)
The chiller has shutdown because the baseplate temperature has decreased to less than 37°F.
VSD – Low Phase B Inverter Baseplate Temperature
(VSD part number 371-03789-xxx (503 HP 60 Hz; 419 HP 50 Hz)
The chiller has shutdown because the baseplate temperature has decreased to less than 37°F.
VSD – Low Phase C Inverter Baseplate Temperature
(VSD part number 371-03789-xxx (503 HP 60 Hz; 419 HP 50 Hz)
The chiller has shutdown because the baseplate temperature has decreased to less than 37°F.
VSD – Precharge – Low DC Bus Voltage
During pre-charge, the DC link must be equal to or greater than 50 VDC (41 VDC for 50 Hz) within
½ second and 500 VDC within 15 seconds after the pre-charge relay is energized. If this condition is
not met, a shutdown is performed and this message is generated.
VSD – Precharge – Low DC Bus Voltage
(575V/60 Hz applications)
If the DC Link Voltage does not reach at least 60 VDC (within 4 seconds) or at least 600 VDC (within
20 seconds) after the precharge command has been received, this shutdown is performed.
VSD – Low Inverter Baseplate Temperature
(Applicable to VSD with part number 371-02767- XXX (60 Hz) or 371-03700-XXX (50 Hz))
A baseplate temperature sensor indicating a temperature of less than 37°F will cause the chiller
to shut down and display this message. In most cases, the problem will be an open transmitter or
broken wiring to the transmitter. The normal transmitter resistance is 5K ohms at 77°F.
VSD – Logic Board Processor
This shutdown is generated if a communications problem occurs between the two microprocessors
on the VSD Logic Board.
VSD – Run Signal
Redundant Run Signals are generated by the Control Center; one via TB6-24 and the second via
the serial communications link. Upon receipt of either of the two Run Commands by the VSD, a 5
second timer shall commence timing. If both Run Commands are not received by the VSD Logic
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center 181