York YK Style H Operation Manual page 178

SECTION 3 - DISPLAY MESSAGES
VSD – Low Inverter Baseplate Temperature
(Applicable to VSD with part number 371-02767-
XXX (60Hz) or 371-03700-XXX (50Hz))
A baseplate temperature sensor indicating a temper-
ature 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 transmitter or broken wiring
to the transmitter. The normal transmitter 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 re-
ceived 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 be-
tween the Control Center and the VSD.
VSD – Serial Communications
This message is generated when communications be-
tween the Control Center Microboard and the VSD
Logic Board, is disrupted. This is generally indicative
of defective wiring between the VSD Logic Board and
the Control Center Microboard.
Harmonic Filter – Logic Board or
Communications
This message is generated when communications be-
tween the Harmonic Filter and the VSD Logic Board,
is disrupted for 10 continuous communications cycles
(20 seconds) causing this shutdown to occur.
Harmonic Filter – High DC Bus Voltage
The Harmonic Filter's DC Link Voltage is continu-
ously monitored and if the level exceeds 860VDC,
this shutdown 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
178
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 equals 356 Amps
• 503/419 HP equals 496 Amps
• 790/658 HP equals 745 Amps
• 1048/917 HP equals 385 Amps
If the VSD automatically restarts after this shutdown
and continues to operate properly with the filter oper-
ating, it is likely the filter tripped due to a sag or surge
in the voltage feeding the VSD. If this message reoc-
curs, 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 syn-
chronization 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.
Harmonic Filter – Precharge – Low DC Bus
Voltage
During pre-charge, the Filter's DC link must be equal to
or greater than 50VDC (41VDC for 50Hz) within 1/10
second after the pre-charge relay is energized. If this
condition is not met, a shutdown is performed and this
message is generated.
FORM 160.76-O2
issue date: 6/15/2015
JOHNsON CONtROLs