Procedure in case maintenance has been neglected
Electrolytic capacitors that are subject to an aging effect when depowered are utilized in the inverters. This effect might result in damage to the capacitors if the device is directly connected to the nominal voltage after a long period of storage. If maintenance has been neglected, SEW-EURODRIVE recommends slowly increasing the line voltage up to the maximum voltage. For instance, this can occur with a variable transformer, whose output voltage is configured according to the following overview. According to this regeneration, the device can be used immediately or continue to undergo long-term storage with maintenance.
The following graduations are recommended:
AC 400/500 V devices:
- Stage 1: AC 0 V to AC 350 V within a few seconds
- Stage 2: AC 350 V for 15 minutes
- Stage 3: AC 420 V for 15 minutes
- Stage 4: AC 500 V for 1 hour
