Reforming The Dc Link Capacitors - Siemens SINAMICS S120 Equipment Manual

6.5

Reforming the DC link capacitors

Description
If the Basic Line Modules, Smart Line Modules, Active Line Modules, and Motor Modules
have not been used for more than two years, the DC link capacitors must be reformed. If this
is not carried out, the units could be damaged when the line voltage is connected.
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 can be taken from the
factory serial number on the rating plate.
Note
It is important that the storage period is calculated from the date of manufacture and not from
the date that the equipment was shipped.
Procedure
The DC link capacitors are reformed by applying the rated voltage line-side to the power
block within the chassis without load for at least 30 minutes at room temperature.
Note
It is recommended that during the planned downtimes, the power blocks positioned on the
line side are replaced in order to guarantee the correct functioning of the power blocks
during servicing.
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A
Maintenance and servicing
6.5 Reforming the DC link capacitors
309