WEG CFW11W G2 Series User Manual page 92

Fault/Alarm
A390:
Current unbalance
Phase U B1
A391:
Current unbalance
Phase V B1
A392:
Current unbalance
Phase W B1
A393:
Current unbalance
Phase U B2
A394:
Current unbalance
Phase V B2
A395:
Current unbalance
Phase W B2
A396:
Current unbalance
Phase U B3
A397:
Current unbalance
Phase V B3
A398:
Current unbalance
Phase W B3
A399:
Current unbalance
Phase U B4
A400:
Current unbalance
Phase V B4
A401:
Current unbalance
Phase W B4
Description
Alarm of current imbalance of phase U book 1.
It indicates an imbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current imbalance of phase V book 1.
It indicates an imbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current imbalance of phase W book 1.
It indicates an imbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current imbalance of phase U book 2.
It indicates an imbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current imbalance of phase V book 2.
It indicates an imbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current imbalance of phase W book 2.
It indicates an imbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current imbalance of phase U book 3.
It indicates an imbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current imbalance of phase V book 3.
It indicates an imbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current imbalance of phase W book 3.
It indicates an imbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current imbalance of phase U book 4.
It indicates an imbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current imbalance of phase V book 4.
It indicates an imbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Alarm of current imbalance of phase W book 4.
It indicates an imbalance of 20 % in the current
distribution between this phase and the smallest
current of the same phase in another book, only
when the current in this phase is higher than 75 %
of its rated value.
Troubleshooting and Maintenance
Possible Causes
Poor electrical connection between the DC link
„
and the power unit.
Poor electrical connection between the power
„
unit output and the motor.
Note: In case of quick accelerations and brakes,
this alarm may be momentarily indicated,
disappearing after some seconds. This does not
indicate a malfunction on the inverter. In case this
alarm persists when the motor is operating at
constant speed, it is an indication of abnormal
current distribution between the power units.
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CFW-11W G2 | 6-9