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

DC link components Booksize

5.1

Braking Module Booksize

5.1
5.1.1

Description

A braking module (and an external braking resistor) is required to bring drives to a controlled
stop in the event of a line failure (e.g. emergency retraction or EMERGENCY OFF category
1) or to limit the DC link voltage during short-time regeneration if, for example, the
regenerative capability of the line module has been deactivated or has not been
dimensioned sufficiently.
The braking module contains the required power electronics and the associated control.
When the braking module is operated, the energy supplied back is dissipated via an external
braking resistor. The resistor is installed outside the cabinet.
The braking module can also be used with a braking resistor for fast discharging of the DC
link. The DC link is discharged in a controlled manner via the braking resistor once the
rectifier unit has been switched off and the line-up has been disconnected from the power
supply (e.g. main circuit-breaker, line contactor). The function can be activated via a digital
input on the braking module.
To operate the braking modules, a minimum capacitance is required in the DC link.
Depending on the braking resistor used, this is:
braking resistor 25 kW, DC link capacitance 220 µF;
braking resistor 100 kW, DC link capacitance 330 µF.
The capacitance of the braking module (110 µF) is included in the total capacitance.
When the braking modules are connected in parallel, the above-mentioned minimum
capacitance must be available for each braking module.
Note
Only the modules that are connected to each other via the DC link busbar can be included in
the total capacitance.
The cable between the braking module and the braking resistor is limited to 10 m.
Equipment Manuel for Booksize Power Modules
Manual, (GH2), Edition 06.2005, 6SL3097-2AC00-0BP2
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5-1