Siemens SINAMICS S120 Equipment Manual page 391

CAUTION
If parameter p0864 is not wired to the checkback signal, it is possible to operate the switch
under load. This can shorten the service life of the switch.
NOTICE
To switch from the "Pre-charging" to the "1 (Operation)" position, a switching current of
4 A/24 V DC is required for 30 ms. This must be provided via the auxiliary power supply
and taken into account during dimensioning (see the block diagram above).
Note
When activating digital inputs, note the guidelines provided in the List Manual and S120
Commissioning Manual.
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A
8.20 L37, DC interface incl. pre-charging input circuit for the relevant DC link capacitance
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