Central Braking Modules - Siemens SINAMICS S120 Manual

5.7

Central Braking Modules

5.7.1 General information
Hazardous electrical voltage
Hazardous voltages are present in certain parts of this equipment during operation of the
cabinet unit.
Only qualified personnel may work on the cabinet.
Such personnel must be thoroughly familiar with all the warnings and maintenance
procedures for the cabinet described in the documentation provided.
The successful and safe operation of this cabinet unit is dependent on correct transport,
proper storage and installation, as well as careful operation and maintenance.
National safety regulations must be observed.
5.7.2 Description
Note
Additional information
Refer to the layout diagrams and circuit diagrams provided on the enclosed customer DVD
for the arrangement of components and interfaces, and for wiring.
Central Braking Modules limit the DC link voltage at a central location in the drive line-up
when the motors are operated in regenerative mode and energy recovery to the supply
system is not possible. If, in regenerative mode, the voltage of the DC busbar exceeds a limit
value, an externally installed braking resistor is switched in, thus restricting the voltage from
increasing further. The regenerative energy is converted to heat loss. The braking resistor is
switched in by the Braking Module inside the Cabinet Module.
Central Braking Modules are an alternative to the optional Braking Modules (option L61/L62
or L64/L65) and are particularly suitable when high braking power is required in a drive line-
up.
Central Braking Modules operate as fully stand-alone modules. They only require a
connection to the DC link. An external control voltage is not required.
The capacitor module in the Central Braking Module is an extension of the DC link
capacitance for the safe functioning of the Braking Module.
Cabinet Modules
Manual, 03/2013, A5E03263538A
DANGER
Cabinet Modules
5.7 Central Braking Modules
235