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

DC link components

5.1

Braking Module

5.1.1

Description

A Braking Module and an external braking resistor are required to bring drives to a controlled
standstill in the event of a power failure (e.g. emergency retraction or EMERGENCY STOP
category 1) or limit the DC link voltage if the generator is operated for a short period of time,
for example because there is no regenerative feedback capability into the supply network
when a Basic Line Module is used). The Braking Module contains the power electronics and
the associated control.
During operation the DC link energy is converted into heat loss in an external braking
resistor outside of the control cabinet. Braking Modules function autonomously. Parallel
operation of several braking modules is possible. In this case, each Braking Module must
have its own braking resistor.
Up to three slots are available depending on the size of the Basic Line Module, Smart Line
Module, Active Line Module, or Motor Module:
Frame sizes FB, GB, FX, GX:
Frame size HX:
Frame size JX:
Figure 5-1
Layout
The Braking Module in chassis format is inserted in a mounting location inside the Basic Line
Modules, Smart Line Modules, Active Line Modules, or Motor Modules, the fan of which
ensures forced cooling. The supply voltage for the electronics is drawn from the DC link. The
Chassis power units
Manual, (GH3), 10/2008, 6SL3097-2AE00-0BP3
Braking Module
1 mounting location
2 mounting locations
3 mounting locations
5
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