Siemens SINAMICS S120 Manual page 407

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● Make sure that the device does not receive a power-on command (e.g. from the keyboard

or terminal block).

● Connect the forming circuit.

● While forming, 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.

● For forming using resistors, the module must remain in the circuit for approx. 1h. The

resistors will become very hot if there is a fault in the unit (surface temperature > 80 °C).

Manual, (GH6), 07/2016, 6SL3097-4AL00-0BP5

Service and maintenance

11.4 Forming the DC link capacitors