606.x DC voltage asymmetric
Description
The direct voltage over the link from the zero point to +VDC and -VDC deviates at least 100 V. In case of drives which only pick off one side of the DC link, energy recovery could lead to asymmetry and the capacitors could fail.
Remedy
- Check/replace balancing resistors.
- Check/replace neutral conductor choke.
- Check/replace capacitors.
- Distribute the drives differently on the DC link voltage.