Corrected from:
Inverter Drives 8400 StateLine, HighLine, and TopLine from firmware version 14.00.00.00
Response of the new version?
Behaviour has been corrected.
Which products are affected?
Inverter Drives 8400 StateLine, HighLine, and TopLine with a firmware version lower than 14.00.00.00
What happens?
No pulse inhibit is set after expiry of the hold time for DC braking (C107), and the DC injection brake is activated for an infinite amount of time.
When does the problem occur?
The following conditions must all be met at the same time:
- C142 bit 3=0 (no inhibit in the case of undervoltage)
- DC braking hold time C107 is set to a non-zero value
- DC-injection braking is active
- Controller enable is active
- External 24 V supply
If the supply of the power section (AC230V, AC400V or DC supply) is switched on now, the problem occurs
Short-term measures/recommendations?
Set C142 bit 3 to 1
or
Switch external 24 V supply using the supply of the power section
or
After switching on the supply of the power section, deactivate controller enable once or deactivate DC-injection braking once
Evaluation:
A DC injection brake that is continuously switched on is not energy-efficient and causes increased noise emission.
By default, a DC braking current of 50% of the rated inverter current is injected. If the rated power of the motor is considerably lower than the rated inverter power, the motor can be thermally destroyed due to the DC injection brake.
