6
6-6 | CFW-11M RB
Troubleshooting and Maintenance
Fault/Alarm
Description
Possible Causes
A390:
Current Unbalance at
Phase U B1
Phase U book 1 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
;
Bad electric connection between the DC bus
and the power unit.
;
Bad electric connection between the power unit
output and the power supply.
Note:
In case of fast acceleration or braking, this
alarm may be indicated momentarily, disappearing
after a few seconds. This is not an indication of
any anomaly in the converter. If this alarm persists
when the motor is operating at a constant speed,
it is an indication of an anomaly in the current
distribution among the power units.
A391:
Current Unbalance at
Phase V B1
Phase V book 1 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
A392:
Current Unbalance at
Phase W B1
Phase W book 1 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
A393:
Current Unbalance at
Phase U B2
Phase U book 2 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
A394:
Current Unbalance at
Phase V B2
Phase V book 2 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
A395:
Current Unbalance at
Phase W B2
Phase W book 2 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
A396:
Current Unbalance at
Phase U B3
Phase U book 3 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
A397:
Current Unbalance at
Phase V B3
Phase V book 3 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
A398:
Current Unbalance at
Phase W B3
Phase W book 3 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
A399:
Current Unbalance at
Phase U B4
Phase U book 4 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
A400:
Current Unbalance at
Phase V B4
Phase V book 4 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
A401:
Current Unbalance at
Phase W B4
Phase W book 4 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
A402:
Current Unbalance at
Phase U B5
Phase U book 5 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
A403:
Current Unbalance at
Phase V B5
Phase V book 5 current unbalance alarm.
It indicates a 20 % unbalance in the current distribution
between this phase and the smallest current of the
same phase in other book, only when the current in this
phase is higher than 75 % of its nominal value.
