Siemens SINAMICS S120 Device Manual page 328

Maintenance and servicing
6.5 Forming the DC link capacitors
Forming circuit for Motor Modules
Figure 6-33
Procedure
● The unit being formed must not receive a power-on command (e.g. from the keyboard,
BOP20 or terminal block).
● Connect the appropriate forming circuit.
● During the forming process, the incandescent lamps must become less bright or go
completely dark. If the incandescent lamps continue to be brightly lit, a fault has occurred
in the drive unit or in the wiring.
Maintaining the operational readiness of individual power blocks for servicing
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.
328
Forming circuit for Motor Modules
Cabinet Modules NEMA
Manual, 04/2014, A5E03586450A