York YK-EP Operation And Maintenance Manual page 218

The chiller has shutdown because the baseplate temperature has increased to greater than 158°F.
The chiller can be started after the fault condition clears, the RESET button on the VSD Logic Board
and the Operator presses the WARNING RESET button.
VSD – High Phase C Inverter Baseplate Temperature
(VSD part number 371-03789-xxx (503HP 60 Hz; 419HP 50 Hz)
The chiller has shutdown because the baseplate temperature has increased to greater than 158°F.
The chiller can be started after the fault condition clears, the RESET button on the VSD Logic Board
and the Operator presses the WARNING RESET button.
VSD – Precharge Lockout
If the VSD fails to make pre-charge, the relay will drop out for ten seconds while the VSD fans and
water pumps remain energized and the pre-charge resistors cool down. After this, the VSD will
attempt to initiate pre-charge again.
If the VSD fails to make pre-charge after 3 consecutive attempts, the unit will shut down, lockout,
and display this message: The chiller can be started after the Operator presses the WARNING RESET
button.
Harmonic Filter – High Heatsink Temperature
(Style D VSD)
The Harmonic Filter power assembly has one heatsink transmitter on the 503 HP units, and two
heatsink transmitter on the 790 HP units. If the temperature on any heatsink exceeds 167°F, the
unit will shut down. This message is usually an indication of a low coolant level in the VSD cooling
loop. The chiller can be started after the fault condition clears, the OVERTEMP RESET button on the
Filter Logic Board is pressed and the Operator presses the WARNING RESET button.
Harmonic Filter – High Baseplate Temperature
(Applicable to VSD with part number 371-02767-XXX (60 Hz) and 371-03700-XXX (50 Hz))
This shutdown occurs when the baseplate temperature exceeds 174°F (79°C). The chiller can be
started after the fault condition clears, the OVERTEMP RESET button on the Filter Logic Board is
pressed and the Operator presses the WARNING RESET button.
Harmonic Filter – High Baseplate Temperature
(VSD part number 371-03789-xxx (503HP 60 Hz; 419HP 50 Hz)
The chiller has shutdown because the baseplate temperature has increased to greater than 194°F.
The chiller can be started after the fault condition clears, the OVERTEMP RESET button on the Filter
Logic Board is pressed and the Operator presses the WARNING RESET button.
VSD – Harmonic Filter-High Baseplate Temperature
(575V/60 Hz applications)
If the baseplate temperature rises above the following limits, this shutdown is performed:
424HP - 70.0°F, 174.2°C
608HP - 88.0°F, 190.4°C
Harmonic Filter – High Total Demand Distortion
This shutdown indicates the filter is not operating correctly and the input current to the VSD/Filter
is not sinusoidal. This shutdown will occur if the TDD exceeds 25% continuously for 45 seconds.
TDD is an acronym for Total Demand Distortion, a term defined by the IEEE Std 519-2014 standard
as the total root-sum-square harmonic current distortion, in percent of the maximum demand
load current (15 or 30 min demand). In the filter option supplied by YORK, the displayed TDD is
218 YK-EP Style B Centrifugal Chiller