Siemens SINAMICS S120 Manual page 384

Maintenance and Servicing
8.5 Forming the DC link capacitors
Procedure in the event of repair or replacement
A replacement Line Module or Motor Module or the corresponding replacement power block
has to be re-formed after being in storage for a period of more than two years.
The DC-link capacitors are re-formed by applying the rated voltage without load for at least
30 minutes.
To do this, the DC link must be precharged (i.e. the Line Modules switched on), while the
controller for the existing Motor Modules must not be enabled for the specified length of time.
Procedure for re-forming outside the drive line-up
Replacement power units which have to be held ready for immediate use in the event of
repair or replacement can also be re-formed individually and outside the drive line-up.
For this, the equipment must be connected to the forming circuits described in the following.
Components for the forming circuit (recommendation)
● One fuse switch 3 AC 400 V / 10 A or 690 V / 10 A
● Three incandescent lamps 230 V / 100 W for a line voltage of 3 AC 380 to 480 V.
● Six incandescent lamps 230 V / 100 W for a line voltage of 3 AC 500 to 690 V, where two
● Various small components, such as lamp sockets, cable 1.5 mm
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Alternatively, use three resistors of 1 kΩ / 100 W each (e.g. GWK150J1001KLX000 from
Vishay) instead of the incandescent lamps.
incandescent lamps must be connected in series in each supply phase.
Alternatively, use three resistors of 1 kΩ / 160 W each (e.g. GWK200J1001KLX000 from
Vishay) instead of the incandescent lamps.
CAUTION
Install lamp sockets with insulation
For a line voltage of 3 AC 500 to 690 V, the two lamp sockets connected in series must
be insulated and protected from touch, because the insulation of the sockets is not
designed for this high voltage.
, etc.
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Manual, (GH3), 01/2013, 6SL3097-4AE00-0BP3
Chassis power units