Johnson Controls YORK YK MaxE, Operation Manual

Page: 165 / 184

FORM 160.54-O1
165
JOHNSON CONTROLS
2
“ 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
TEMPERATURE
”
(Style D VSD)
The Harmonic Filter power assembly has one heat-
sink thermistor on the 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))
(If compressor other than “P”, requires Flash Memory
Card version C.MLM.01.05A.xxx and later) This shut-
down 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 COMPRESSOR
Switch is placed in the Stop-reset position (O).
“HARMOnIC FILTER – HIgH BASEPLATE
TEMPERATURE”
(VSD part number 371-03789-xxx (503HP 60 Hz; 419HP
50 Hz) (Flash Memory Card version C.MLM.01.08.xxx
and later)
The chiller has shutdown because the Baseplate
temperature has increased to greater than 194ºF. 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 position (O).
“VSD-HARMOnIC FILTER-HIgH BASEPLATE
TEMPERATURE” (575V/60Hz applications)
(Software version C.OPT.01.15.xxx (or later))
If the Baseplate temperature rises above the following
limits, this shutdown is performed:
424HP – 70.0 deg F, 174.2 deg C
608HP – 88.0 deg F, 190.4 deg 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 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 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 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 typi -
cally 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).
VSD – LOW FREQUEnCY DETECTED”
(Software version C.MLM.01.14.xxx (and later) or
C.OPT.01.14.306 (and later))
After a 20 second bypass after entering “System Run”,
if the VSD frequency decreases to below 1 Hz less than
the minimum allowed frequency for 25 continuous sec-
onds, this shutdown is initiated. With software version
C.OPT.01.19.307 (and earlier), this fault occurs when the
VSD frequency falls below 1 Hz less than the minimum
allowed frequency after having reached the minimum
frequency. The minimum allowed frequency for the
VSD is 25Hz for 50Hz units; 30Hz for 60Hz units. The
COMPRESSOR Switch is placed in the STOP-RESET
position.