Dc Braking; Activation Via Parameters - Siemens SINAMICS S120 Function Manual

Basic functions
7.12 Armature short-circuit, DC braking
7.12.2

DC braking

Preconditions
● This function has been released for Motor Modules in the booksize, blocksize and chassis
formats.
● An induction motor must be used.
With the function "DC braking", after a demagnetization time, a DC current is injected in the
stator windings of the induction motor. The DC current brakes the motor.
7.12.2.1

Activation via parameters

Setting
DC braking is set with parameter p1231 = 4.
● Setting the braking current for DC braking with p1232[0..n]
● Setting the braking current duration for DC braking with p1233[0..n]
● Setting the start speed for DC braking with p1234[0..n]
Activation
The function is activated if the signal source of p1230 is set to "1". Initially, for the motor
demagnetization time p0347[0 ... n], the pulses are inhibited until the motor is demagnetized.
The DC braking start speed parameter p1234 is not taken into account with this activation.
The DC braking current p1232[0 ... n] is injected into the motor as long as a "1" signal is
available at the input of p1230. The motor can be braked down to standstill.
If the drive is switched off - and DC braking is activated - the drive switches itself on. DC
current is then injected into the stator windings.
Deactivation
If DC braking is deactivated by setting the signal source of p1230 to "0" and the ON
command is still active, then the drive returns to its selected operating mode.
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Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions