Dc Link Components; Braking Module; Description - Siemens SINAMICS S120 Combi Equipment Manual

DC link components

7.1

Braking Module

7.1.1

Description

A Braking Module with an external braking resistor is required in order to
● be able to stop the S120 Combi and expansion axes in a controlled fashion when the
● limit the DC link voltage for brief generator operation, if e.g. the energy recovery function
The Braking Module includes the necessary power electronics and control. The Braking
Module is operational, the regenerative energy is dissipated as thermal energy in an external
braking resistor.
Furthermore, the Braking Module can also be used with a braking resistor to quickly
discharge the DC link. The DC link is discharged in a controlled manner via the braking
resistor once the infeed has been switched off and the line-up has been disconnected from
the line supply (e.g. using a main switch, line contactor). The function can be activated via a
digital input on the braking module.
Note
Only the components that are connected to each other via the DC link busbar can be
included in the total capacitance.
Note
The fast discharge function is used for discharging the capacitors in the DC link after
interruption of the line supply. This makes sense, for example, when maintenance tasks are
to be performed on the S120 Combi and/or motor installation (reduction of the discharge
time). For this purpose, the drive system must be completely disconnected from the line
supply and the motors must be in standstill position.
The cable between the braking module and the braking resistor is limited to 10 m.
SINAMICS S120 Combi
Manual, Edition 05.2010, 6SL3097-4AV00-0BP0
power fails (e.g. emergency retraction or EMERGENCY OFF Category 1).
is deactivated or is not adequately dimensioned.
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