York YK Style H Operation Manual page 187

FORM 160.76-O2
issue date: 6/15/2015
VSD – High Phase B Inverter Baseplate
Temperature
(VSD part number 371-03789-xxx (503HP 60Hz;
419HP 50Hz))
The chiller has shutdown because the baseplate tem-
perature 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 Clear Fault key
is pressed on the display.
VSD – High Phase C Inverter Baseplate
Temperature
(VSD part number 371-03789-xxx (503HP 60Hz;
419HP 50Hz))
The chiller has shutdown because the baseplate tem-
perature 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 Clear Fault key
is pressed on the display.
VSD – Precharge Lockout
If the VSD fails to make pre-charge, the pre-charge re-
lay shall drop out for 10 seconds during which time the
VSD's fans and water pumps shall remain energized
in order to permit the pre-charge resistors to cool. Fol-
lowing this 10-second cool down period, pre-charge
shall again be initiated. The VSD shall attempt to make
pre-charge 3 consecutive times. If the VSD fails to
make pre-charge on 3 consecutive tries, the unit will
shut down, lockout and display this message. The chill-
er can be started after the Clear Fault key is pressed on
the display.
Harmonic Filter – High Heatsink Temperature
(Style D VSD)
The Harmonic Filter power assembly has one heat-
sink 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 cool-
ant 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 Clear Fault key is pressed on the display.
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
Harmonic Filter – High Baseplate Temperature
(Applicable to VSD with part number 371-02767-xxx
(60Hz) and 371-03700-xxx (50Hz))
This shutdown occurs when the baseplate temperature
exceeds 174°F (79°C). The chiller can be started af-
ter the fault condition clears, the OVERTEMP RESET
button on the Filter Logic Board is pressed, and the
Clear Fault key is pressed on the display.
Harmonic Filter – High Baseplate Temperature
(VSD part number 371-03789-xxx (503HP 60Hz;
419HP 50Hz))
The chiller has shutdown because the baseplate tem-
perature has increased to greater than 194°F. The chill-
er can be started after the fault condition clears, the
OVERTEMP RESET button on the Filter Logic Board
is pressed and the Clear Fault key is pressed on the
display.
VSD – Harmonic Filter-High Baseplate
Temperature
(575V/60Hz 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 cor-
rectly and the input current to the VSD/Filter is not
sinusoidal. This shutdown will occur if the TDD ex-
ceeds 25% continuously for 45 seconds. TDD is an
acronym for Total Demand Distortion, a term defined
by the IEEE Std 519-1992 standard as the total root-
sum-square harmonic current distortion, in percent of
the maximum demand load current (15 or 30 min de-
mand). In the filter option supplied by YORK, the dis-
played TDD is the total RMS value of all the harmonic
current supplied by the main power to the VSD divided
by the chiller Full Load Amps, in percent. A standard
VSD, less the optional filter typically has an input cur-
rent TDD level on the order of 28-30%. The chiller can
be started after the Clear Fault key is pressed on the
display.
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