Siemens SINAMICS G120 - DC Braking

Setting functions
8.7 Application-specific functions
Inverter with CU230P-2 Control Units
Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG
275
Braking method depending on the application
Application examples
Electrical braking methods
Power Modules that can be
used
Pumps, fans, mixers,
compressors, extruders
Not required PM230, PM240, PM250,
PM260, PM330
Grinding machines, conveyor
belts
DC braking, compound braking PM240
Centrifuges, vertical conveyors,
hoisting gear, cranes, winders
Dynamic braking
PM240
Braking with regenerative feedback
into the line supply
PM250, PM260
8.7.3.2
DC braking
DC braking is used for applications without regenerative feedback into the line supply, where
the motor can be more quickly braked by impressing a DC current than along a braking
ramp.
Typical applications for DC braking include:
● Centrifuges
● Saws
● Grinding machines
● Conveyor belts
Function
NOTICE
Motor damage caused by overheating
The motor can overheat if it is braked for long periods of time or frequently using DC
braking. This may damage the motor.
• Monitor the motor temperature.
• If the motor gets too hot during operation you must select another braking method or
give the motor more time to cool down.
With DC braking, the inverter outputs an internal OFF2 command for the time that it takes to
de-energize the motor p0347 - and then impresses the braking current for the duration of the
DC braking.
The DC-braking function is possible only for induction motors.