Table 100: Safety shutdown messages
Message Description
VSD – MOTOR
CURRENT
IMBALANCE
Each phase of motor current is compared against the average of the three
phases of motor current to determine the current imbalance value. If the
current imbalance value is greater than 32 amps for a period of 45 seconds,
then this shutdown is generated. For example: The three motor current RMS
values are 200, 225, and 240 amps. This would be calculated to an average
current of (200 + 260 + 240)/3 = 233 amps. Subtract the real current value from
the average value. 200 – 233 = 33, 260 – 233 = 33, 240 – 233 = 7. If this condition
or worse were maintained for 45 seconds, then this shutdown is generated,
because the motor current imbalance is 33 amps. The chiller can be started after
the clear faults button is pressed.
VSD – 105%
MOTOR CURRENT
OVERLOAD
The 105% motor current overload value is based on the highest output current
compared to the programmed Motor Current value displayed on the Control
panel. The 105% motor current overload value is 1.05 times the programmed
Motor Current value displayed on the Control panel. The motor current overload
value must be greater than the shutdown value for 40 continuous seconds for
this shutdown to occur.
Drive model Maximum motor current overload shutdown value
0490, 0490A 490 Amps
0612A 612 Amps
0730A 730 Amps
0774 774 Amps
1278A 1278 Amps
When the condition clears, the chiller can be started after the clear faults button
is pressed.
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 button 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 button
is pressed.
VSD – PHASE B
INPUT DCCT
See VSD – PHASE A INPUT DCCT.
VSD – PHASE C
INPUT DCCT
See VSD – PHASE A INPUT DCCT.
125
YMC
2
Mod B with OptiView Control Center
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