SECTION 3 - DISPLAY MESSAGES
JOHNSON CONTROLS
189
FORM 160.54-O1
ISSUE DATE: 9/10/2014
3
VSD – Low Phase B Inverter Heatsink
Temperature
(Style D VSD)
See Low Phase A Inverter Heatsink Temperature mes-
sage above.
VSD – Low Phase C Inverter Heatsink
Temperature
(Style D VSD)
See Low Phase A Inverter Heatsink Temperature mes-
sage above.
VSD – Low Converter Heatsink Temperature
If VSD part number is 371-02767-XXX (60Hz) or 371-
03700-XXX (50Hz), a heatsink temperature sensor in-
dicating a temperature of less than 37°F will cause the
chiller to shutdown and display this message. In most
cases, the problem will be an open transmitter or bro-
ken wiring to the transmitter. The normal transmitter
resistance is 10K ohms at 77°F.
VSD – Low Phase A Inverter Baseplate
Temperature
(VSD part number 371-03789-xxx (503 HP 60Hz; 419
HP 50Hz) (Flash Memory Card version C.MLM.01.08
and later)
The chiller has shutdown because the baseplate tem-
perature has decreased to less than 37°F.
VSD – Low Phase B Inverter Baseplate
Temperature
(VSD part number 371-03789-xxx (503 HP 60Hz; 419
HP 50Hz) (Flash Memory Card version C.MLM.01.08
and later)
The chiller has shutdown because the baseplate tem-
perature has decreased to less than 37°F.
VSD – Low Phase C Inverter Baseplate
Temperature
(VSD part number 371-03789-xxx (503 HP 60Hz; 419
HP 50Hz) (Flash Memory Card version C.MLM.01.08
and later)
The chiller has shutdown because the baseplate tem-
perature has decreased to less than 37°F.
VSD – Precharge – Low DC Bus Voltage
During pre-charge, the DC link must be equal to or great-
er than 50VDC (41VDC for 50Hz) within ½ second and
500VDC within 15 seconds after the pre-charge relay is
energized. If this condition is not met, a shutdown is per-
formed and this message is generated.
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 (60Hz) or 371-03700-XXX (50Hz))
(If compressor other than “P”, requires Flash Memory
Card version C.MLM.01.05A.xxx and later)
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 Adaptive Capacity Control (ACC) Board
and the VSD Logic Board, or between the Control
Center Microboard and the VSD Logic Board, is dis-
rupted. This is generally indicative of defective wiring
between J11 on the VSD Logic Board and J8 on the
ACC Board.
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