Reforming The Dc Link Capacitors - Siemens SINAMICS S120 Equipment Manual

9.5

Reforming the DC link capacitors

Description
If the Power Module, Basic Line Module, Active Line Module and Motor Module are kept in
storage for more than two years, the DC link capacitors have to be reformed. If this is not
done, the units could be damaged when they are operated under load.
If the cabinet is commissioned within two years of its date of manufacture, the DC link
capacitors do not need to be reformed. The date of manufacture is indicated in the serial
number on the type plate (see "Technical Specifications").
Note
The DC link capacitors are reformed by applying the rated voltage without load for at least 30
minutes at room temperature.
Procedure
The DC link capacitors are reformed by applying the rated voltage without load for at least
30 minutes at room temperature.
Type plate
Fig. 9-28
Chassis Power Units Liquid Cooled
SINAMICS S120 Equipment Manual, Edition 12/2007, 6SL3097-2AM00-0BP4
Type plate for an Motor Module
Maintenance and servicing
9.5 Reforming the DC link capacitors
9-59