Table 91: Cycling shutdown messages
Message Description
VSD – HIGH INTERNAL
AMBIENT TEMPERATURE
The variable speed drive contains two temperature sensors, which
monitor the unit’s internal ambient temperature. This shutdown is
generated when the higher of the two ambient temperatures exceeds
a high limit of 158°F (70°C). The unit’s fan(s) and water pump(s) remain
energized until the internal temperature drops below 148°F (64°C),
after which they shall be de-energized and the fault can be cleared.
Some potential causes for this shutdown are internal VSD fan failure,
VSD coolant pump failure, entering condenser water temperature
higher than design, condenser water flow lower than required, fouled
VSD heat exchanger, or restriction of condenser water to the VSD.
VSD – HIGH PHASE A
INPUT CURRENT
If the A phase input current exceeds the value for the given model of
drive, then a cycling shutdown will occur. If three high input current
cycling shutdown faults occur on any phase within 90 minutes, the
third fault in the 90 minute period will cause a Safety Shutdown. If the
safety shutdown occurs, the chiller can be restarted after the CLEAR
FAULTS key is pressed.
Drive model Input current fault value
0490 886 Amps
0490A 942 Amps
0612A 1418 Amps
0730A 1418 Amps
0774 1446 Amps
1278A (380-415 VAC) 3304 Amps
1278A (460 VAC) 2796 Amps
VSD – HIGH PHASE B
INPUT CURRENT
See VSD – HIGH PHASE A INPUT CURRENT message preceding.
VSD – HIGH PHASE C
INPUT CURRENT
See VSD – HIGH PHASE A INPUT CURRENT message preceding.
VSD – HIGH PHASE A
MOTOR CURRENT
If the A phase motor current exceeds the value for the given model of
drive, then a cycling shutdown will occur. If three high motor current
cycling shutdown faults occur on any phase within 90 minutes, the
third fault in the 90 minute period will cause a Safety Shutdown. If the
safety shutdown occurs, the chiller can be restarted after the CLEAR
FAULTS key is pressed.
Drive model Motor current fault value
0490, 0490A 776 Amps
0612A 1094 Amps
0730A, 0774 1317 Amps
1278A 2164 Amps
VSD – HIGH PHASE B
MOTOR CURRENT
See VSD – HIGH PHASE A MOTOR CURRENT message preceding.
VSD – HIGH PHASE C
MOTOR CURRENT
See VSD – HIGH PHASE A MOTOR CURRENT message preceding.
121
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