YORK INTERNATIONAL
110
FORM 160.55-O1 (920)
VSD Logic Board is pressed and the COMPRESSOR
switch is placed in the Stop-reset (O) position.
"VSD – HIGH PHASE C INVERTER BASE-
PLATE TEMPERATURE”
(VSD part number 371-03789-xxx (503HP 60Hz; 419HP
50Hz (Flash Memory Card version C.MLM.02.04.xxx
and later)
The chiller has shutdown because the baseplate tempera-
ture has increased to >158 ºF. The chiller can be stated
after the fault condition clears, the RESET button on the
VSD Logic Board is pressed and the COMPRESSOR
switch is placed in the Stop-reset (O) position.
“
VSD – PRECHARGE LOCKOUT
”
If the VSD fails to make Pre-charge, the Pre-charge
relay 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 chiller
can be started after the
COMPRESSOR
switch is placed
in the Stop-reset (O) position.
“
HARMONIC FILTER – HIGH HEATSINK TEM-
PERATURE
”
(Style D VSD)
The Harmonic Filter power assembly has one heatsink
thermistor on the 351 and 503 HP units and two heatsink
thermistors 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 COMPRESSOR switch is placed in the Stop-reset
(O) position.
“HARMONIC FILTER – HIGH BASEPLATE
TEMPERATURE”
(Applicable to VSD with part number 371-02767-
XXX (60 Hz) and 371-03700-XXX (50 Hz))
(Requires Flash Memory Card version C.MLM.-
02.02A.xxx and later)
This shutdown occurs when the Baseplate temperature
exceeds 174ºF (79ºC). The chiller can be started after the
fault condition clears, the OVERTEMP RESET button
on the Filter Logic Board is pressed and the COMPRES-
SOR Switch is placed in the Stop-reset position (O).
“HARMONIC FILTER – HIGH BASEPLATE
TEMPERATURE”
(VSD part number 371-03789-xxx (503HP 60Hz; 419HP
50Hz (Flash Memory Card version C.MLM.02.04.xxx
and later)
The chiller has shutdown because the Baseplate tem-
perature has increased to >194 ºF. The chiller can be
started after the fault condition clears, the OVERTEMP
reset button on the Filter Logic Board is pressed and
the COMPRESSOR switch is placed in the stop-reset
(O) position
“
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 si-
nusoidal. 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 519-1992 standard as the “total root-sum-square har-
monic 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
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 current TDD level
on the order of 28-30%. The chiller can be started after
the COMPRESSOR switch is placed in the Stop-reset
position (O).
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