Siemens SINAMICS S220 Equipment Manual page 315

Procedure
Proceed as follows to reform DC link capacitors:
1. For a 50 mm wide component, first remove the DC link bridge.
2. Make sure that the device does not receive a switch-on command (e.g. via PROFINET/
PROFIBUS, BOP20 or terminal block).
3. Connect the forming circuit. When forming with PTC resistors, the component must remain
in the circuit for approx. 1 h.
Figure 12-2
Booksize power units
Equipment Manual, 09/2023, A5E53307519B AA
Forming circuit for Line Modules with PTC resistors
Service and maintenance
12.2 Forming DC link capacitors
313