198
Operating Instructions – Electronic Motor DRC.-..-DAC
11
Shutdown
Service
11.10 Shutdown
To shut down the DRC drive unit, de-energize it using appropriate measures.
11.11 Storage
Observe the following instructions when shutting down or storing DRC drive units:
• If you shut down and store the DRC drive unit for a longer period, you must close
open cable entries and cover contacts with protective caps.
• Make sure that the unit is not subject to mechanical impact during storage.
Observe the notes on storage temperature in the "Technical Data" chapter.
11.12 Extended storage
11.12.1 Electronics
If the unit is stored for a long time, connect it to the supply system voltage for at least
5 minutes every 2 years. Otherwise, the unit's service life may be reduced.
Procedure in case
maintenance has
been neglected
Electrolytic capacitors are used in the inverters. They are subject to aging effects when
de-energized. This effect can damage the capacitors if the unit is connected using the
nominal voltage after a longer period of storage. If you have not performed maintenance
regularly, SEW-EURODRIVE recommends that you increase the line voltage slowly up
to the maximum voltage. This can be done, for example, by using a variable transformer
for which the output voltage has been set according to the following overview. After you
have completed the regeneration process, the unit can be used immediately or stored
again for an extended period with maintenance.
The following stages are recommended:
AC 400/500 V units:
• 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
WARNING
Electric shock due to charged capacitors.
Severe or fatal injuries.
• Observe a minimum switch-off time of 10 minutes after disconnecting the power
supply.
