Braking Module / External Braking Resistor; Braking Module For Power Units In Chassis Format - Siemens SINAMICS G130 Engineering Manual

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Braking Module / External braking resistor

Braking Module for power units in chassis format

A Braking Module and an external braking resistor are required in order to be able to decelerate a drive to a stand still
in the event of a power failure (e.g. emergency withdrawal or emergency stop category 1) or for limiting the DC link
voltage during short-term regenerative operation of the motor, if, for example, a regenerative operation of the Line
Module is not possible (BLM) or the regenerative operation has been deactivated (SLM or ALM).
The Braking Module for the chassis units contains the power electronics and the corresponding control facility. When
in operation the energy of the DC link is converted into heat in an external braking resistor outside of the cabinet unit.
The Braking Module operates autonomously, meaning that there is no communication between the Braking Module
and the controller of the chassis unit.
Braking Module for installation in a power unit in chassis format
Parallel operation of several Braking Modules is possible, but each Braking Module must be connected to its own
braking resistor. A parallel configuration of up to four Braking Modules per DC busbar is possible. For higher braking
power, cabinet units in the S120 Cabinet Module range are available, see chapter "Modular Cabinet Unit System
SINAMICS S120 Cabinet Modules", section "Central Braking Modules".
Braking Modules can be installed in every power unit in chassis format. Depending on the frame size of the Line
Module resp. Motor Module it is possible to install up to three Braking Modules. The Braking Modules are installed in
the air outlet at the top of the Power unit.
There are up to three places for installation available depending on the frame size of the Power Unit:
Frame size FX, GX:
Frame size HX:
Frame size JX:
The Braking Unit is made up of two components:
A Braking Module, which is installed in the Power Unit
A braking resistor, which is installed externally (degree of protection IP20).
The Braking Units operate as autonomous units and require no external voltage supply. The Braking Modules are
installed in the air outlet at the top of the Power Units. During braking operation, the kinetic energy of the motor is
converted into heat in the externally installed braking resistor. Between the Braking Module and braking resistor, a
maximum cable length of 100 m is permissible. The braking resistor can, therefore, be installed externally to release
the heat losses outside of the room where the converter is installed. The braking resistor is connected directly to the
terminals of the Braking Module.
The response threshold of the Braking Modules, where they start to operate, can be adapted to the requirements on
site using a switch in the Braking Module. The values for the response thresholds of the Braking Modules and the
corresponding DC link voltages during braking operation are given the following table.
1 place for installation
2 places for installation
3 places for installation
Engineering Information
SINAMICS Engineering Manual - May 2008
© Siemens AG
SINAMICS S120
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