Siemens SINAMICS S120 Manual page 543

Forming circuit for Motor Modules
Figure 10-40 Forming circuit for Motor Modules
Procedure
• It is not permissible that the device being formed receives a power-on command (e.g.
from the keyboard, BOP20 or terminal block).
• Connect the appropriate forming circuit.
• Forming has been completed if the DC link voltage no longer increases.
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.
Air-cooled chassis power units
Equipment Manual, 06/2020, 6SL3097-5AE00-0BP3
Maintenance and Servicing
10.6 Forming the DC link capacitors
541