WEG CFW-11W G2 RB Series User Manual page 89

Troubleshooting and Maintenance
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
6
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
6-6 | CFW-11MW G2 RB
Description
Alarm of current unbalance of phase U book 1.
It indicates an unbalance 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 unbalance of phase V book 1. It
indicates an unbalance 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 unbalance of phase W book 1.
It indicates an unbalance 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 unbalance of phase U book 2.
It indicates an unbalance 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 unbalance of phase V book 2. It
indicates an unbalance 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 unbalance of phase W book 2.
It indicates an unbalance 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 unbalance of phase U book 3.
It indicates an unbalance 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 unbalance of phase V book 3. It
indicates an unbalance 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 unbalance of phase W book 3.
It indicates an unbalance 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 unbalance of phase U book 4.
It indicates an unbalance 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 unbalance of phase V book 4. It
indicates an unbalance 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.
Possible Causes
Poor electrical connection between the DC link
„
and the power unit.
Poor electrical connection between input U, V and
„
W of the power unit and the filter.
Note: In case of quick accelerations and brakes,
this alarm may be momentarily indicated,
disappearing after some seconds. This does not
indicate a malfunction of 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.