Dc Braking; Configuring The Function Via Parameters - Siemens SINAMICS S120 Function Manual

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DC braking

You set the "DC braking" function in the parameters p1231[0...n]. You can determine the

current status of the function in r1239.

Supported Motor Modules

The function has been released for Motor Modules in the Booksize and Chassis formats.

● Operation with induction motors

Function description

Motor accelerates uncontrollably for pulling loads

For pulling loads, when DC braking is used, during the demagnetization time, the motor can

accelerate uncontrollably. This can result in severe injury or death. An additional supporting

mechanical brake is only closed after the demagnetization time - when the motor is already

rotating - and therefore does not prevent the motor from accelerating uncontrollably.

● Do not use DC braking for pulling loads.

Using the "DC braking" function, you can brake induction motors down to standstill. With this

function, after a demagnetization time, a direct current is injected in the stator windings of the

induction motor. The motor is braked by the direct current.

The function is preferably used in the following cases:

● It is not possible to ramp down the drive in a controlled fashion

● Operation with a line module that is not capable of energy recovery

● Operation without a braking resistor

Carry out the following steps to configure the function via parameters:

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Basic functions

8.13 DC braking