Siemens Sinamics S120 Manual page 830

Service and Support Booksize
14.3 Forming the DC link capacitors
Figure 14-5
Procedure
● Be sure to remove the DC-link bridge before forming the DC-link capacitors.
● Make sure that the device does not receive a switch-on command (e.g. from the
● Connect the forming circuit.
● While forming, the incandescent lamps must become less bright or go completely dark. If
● For forming using PTC resistors, the modules must remain in the circuit for approx. 1h.
830
Forming circuit for Motor Modules with PTC resistors
keyboard, BOP20 or terminal block).
the incandescent lamps continue to be brightly lit, a fault has occurred in the drive unit or
in the wiring.
The resistors will become very hot if there is a fault in the unit (surface temperature > 80°
C).
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6