Siemens SINAMICS G120 Operations Instructions download pdf (Page 192)

Functions

7.9 Application-specific functions

Inverter with CU240B-2 and CU240E-2 Control Units

190 Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB

7.9.2.2 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

Whether DC braking or ramp-down with an OFF1 command is more effective depends on

the motor properties.

Principle of operation

With DC braking, the inverter outputs an internal OFF2 command for the time that it takes to

demagnetize the motor - and then impresses the braking current for the duration of the DC

braking.

The following operating modes are available for DC braking.

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Siemens SINAMICS G120 Operations Instructions Page 192

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