Eliminated from:
8400 StateLine / HighLine with firmware version V05.01 or higher
Behaviour of the new version?
The software has been modified as follows:
- During operation, earth fault detection will be inactive in the first 3 seconds after the controller was enabled
- The smoothing time can be set via code C1770 (filter time earth fault detection during operation, factory adjustment 2 ms as before, setting: 0 - 250 ms)
- In devices with filters on the motor side, the function can only be deactivated by a setting of C1770 = 250 ms.
Due to these modifications, it is less likely for capacitive compensation currents to trigger earth fault detection. If the problem occurs nevertheless, increase the smoothing time or deactivate 'Earth fault detection during operation'.
Which products are affected?
8400 StateLine / HighLine with FW <= 04.xx
What happens?
'Earth fault OC2' error message
When does the problem occur?
1. Earth fault detection during operation
Earth fault detection can be triggered in devices with a power greater than 3 kW (devices with current transformers) if filters are used on the motor side which have a capacitive connection to +UG and -UG. During operation, earth fault can be detected from this power if the controller is enabled (Logbook entry: "Earth fault detection OC2".
2. Earth fault detection for long motor cables (> 50 m)
Current sensor technology measurements with motor cable lengths > 50 m show that compensation processes are started after an inverter switch has been switched on. The resulting maximum voltage amplitude approximately amounts to the earth fault threshold so that unintentional activation of the earth fault detection cannot be ruled out.
Possible diagnostics?
Logbook entry, display in the monitor window, display on the keypad
Short-term measures / recommendations?
Deactivation of the earth fault detection (C0602)
Evaluation:
The error can be avoided if the recommendations are followed.
Information taken from chapter 1.1.15 of
Service Message No. 16/2010.
