Table 92: Safety shutdown messages
Message Description
VSD – MOTOR
CURRENT THD
FAULT
This shutdown provides protection to the compressor motor. High levels of
current total harmonic distortion (THD) can cause the motor to overheat. Verify
that all wiring is correctly connected between the inverter and the output
harmonic filter. When the condition clears, the chiller can be started after the
CLEAR FAULTS key is pressed.
VSD – PHASE A
INPUT DCCT
The input current in each phase to the VSD is measured during the precharge
time. If the input current does not exceed the shutdown value for the given
model of drive listed below, then this shutdown is generated.
Drive model Minimum input current shutdown value
0490A, 0490, 0612A, 0730A, 1278A 5.0 amps
0774 15.0 amps
When the condition clears, the chiller can be started after the CLEAR FAULTS key
is pressed.
VSD – PHASE B
INPUT DCCT
See VSD –PHASE A INPUT DCCT message preceding.
VSD – PHASE C
INPUT DCCT
See VSD – PHASE A INPUT DCCT message preceding.
VSD – PHASE A
MOTOR DCCT
The motor current in each phase of the VSD is measured at the beginning of
the run command. The motor current at this time should measure very low.
This low value will be used as the zero current value for the rest of this run time.
The motor current is then monitored for the next 1.5 seconds to ensure that
a minimum amount of current is flowing to the motor. If at the end of the 1.5
second time a minimum of 25 amps peak is not detected, then this shutdown is
generated. When the condition clears, the chiller can be started after the CLEAR
FAULTS key is pressed.
VSD – PHASE B
MOTOR DCCT
See VSD –PHASE A MOTOR DCCT message preceding.
VSD – PHASE C
MOTOR DCCT
See VSD – PHASE A MOTOR DCCT message preceding.
VSD – PHASE
LOCKED LOOP
The VSD must be able to determine the input voltage frequency from the input
voltage measurement. If the input voltage frequency is not stable enough for
the VSD to make this determination, then this shutdown is generated. When
this condition clears, the chiller can be started after the CLEAR FAULTS key is
pressed.
YMC
2
Mod B with OptiView
™
Control Center
138
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