Johnson Controls YORK YK MaxE, Руководство по эксплуатации

Страница: 156 / 184

JOHNSON CONTROLS
156
FORM 160.54-O1
optiView Control Center
VSD-PRECHARgE-LOW DC BUS VOLTAgE ”
(575V/60Hz applications)
(Software version C.OPT.01.15.xxx (or later))
If the DC Link voltage does not reach at least 60VDC
(within 4 seconds) or at least 600VDC (within 20 sec-
onds) 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))
(If compressor other than “P”, requires Flash Memory
Card version C.MLM.01.05A.xxx and later)
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 thermistor or broken wiring to the thermistor.
The normal thermistor resistance is 5K ohms at 77°F.
“ VSD – LOgIC BOARD PROCESSOR ”
This shutdown is generated if a communications prob-
lem 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 Board within 5 seconds, a
shutdown is performed and this message is displayed.
This is generally indicative of a wiring problem between
the Control Center and the VSD.
“ VSD – SERIAL COMMUnICATIOnS ”
This message is generated when communications be-
tween the Adaptive Capacity Control (ACC) Board and
the VSD Logic Board, or between the Control Center
Microboard and the VSD Logic Board, is disrupted. This
is generally indicative of defective wiring between J11
on the VSD Logic Board and J8 on the ACC Board.
“HARMOnIC FILTER – LOgIC BOARD OR
COMMUnICATIOnS”
This message is generated when communications be-
tween the Harmonic filter and the VSD Logic Board, is
disrupted. If equipped with Flash Memory Card version
C.MLM.01.06.xxx and later, the communications must
be interrupted for 10 continuous communications cycles
(20 seconds) before the shutdown will occur.
“ HARMOnIC FILTER – HIgH DC BUS
VOLTAgE
”
The Harmonic filter’s DC Link voltage is continuously
monitored and if the level exceeds 860VDC, this shut-
down is performed. The Harmonic Filter has its own
DC bus as part of the Filter power assembly, and this
DC Link is not connected in any way with the VSD’s
DC link. If this shutdown occurs, it will be necessary
to look at the level of 460VAC applied to the Harmonic
Filter. The specified voltage range is 414 to 508. If the
incoming voltage is in excess of 508, steps should be
taken to reduce the level to within specified limits. The
cause of this message is typically high line voltage or a
surge on the utility supply.
“ HARMOnIC FILTER – HIgH PHASE A
CURREnT
”
The maximum instantaneous harmonic filter current is
monitored and compared to a preset limit. If this limit
is exceeded, a shutdown is performed and this message
is generated. The Filter current is monitored using two
DCCT’s and these signals are processed by the filter
logic board. The preset limits are as follows:
351/292 HP = 356 Amps
503/419 HP = 496 Amps
790/658 HP = 745 Amps
1048/917 HP = 385 AMPS
If the VSD automatically restarts after this shutdown and
continues to operate properly with the filter operating, it is
likely the filter tripped due to a sag or surge in the voltage
feeding the VSD. If this message reoccurs, preventing the
chiller from starting, the VSD will require service.
“
HARMOnIC FILTER – HIgH PHASE B
CURREnT ”
See “Harmonic Filter – High Phase A Current” message
above.
“
HARMOnIC FILTER – HIgH PHASE C
CURREnT ”
See “Harmonic Filter – High Phase A Current” message
above.
“
HARMOnIC FILTER – PHASE LOCKED
LOOP ”
This shutdown indicates that a circuit called “Phase
Locked Loop” on the filter logic board has lost synchro -
nization with the incoming power line. This is usually
indicative of an open fuse in one of the filter’s incoming
power line. Filter power fuses 11FU, 12FU and 13FU
should be checked.