Siemens SINAMICS S120 Manual page 121

Air-cooled chassis power units

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The precharging is monitored via feedback from the contactors to the Active Line Module

To achieve or to increase the permissible DC link capacitance, the precharging resistors must

or can be connected in parallel in each phase.

The specifications regarding connecting precharging resistors in parallel and the DC link

capacitance are included in the technical data of the Active Line Module Chassis-2.

Damage to the units if the pre-charging input circuit is faulty

If the pre-charging input circuit is not correctly set up, the Active Line Module Chassis-2

connected to the Active Interface Module Chassis-2 can be destroyed during switch-on.

• The pre-charging input circuit must be implemented according to the following circuit

Connection example for Active Interface Module Chassis-2

Air-cooled chassis power units

Equipment Manual, 06/2020, 6SL3097-5AE00-0BP3

and the notes for dimensioning the various components.

Line-side power components

4.7 Active Interface Modules Chassis-2