Armature Short-Circuit Braking, Dc Braking; General; External Armature Short-Circuit Braking - Siemens SINAMICS G150 Operating Instructions Manual

Parameter
• p3820
• ...
• p3839
• r3840
• r3841
• p3842
• p3845
• p3846
• p3847
9.2.9

Armature short-circuit braking, DC braking

9.2.9.1

General

The "External armature short-circuit" function for permanent-magnet synchronous motors
initiates an external contactor which short-circuits the motor via resistors when the pulses
are canceled. This reduces the kinetic energy of the motor.
The "Internal armature short-circuit braking" function for permanent-magnet synchronous
motors short-circuits a half-bridge in the power unit to control the motor power consumption,
thus braking the motor.
The "DC braking" function for induction motors injects direct current into the motor, thus
braking the motor.
9.2.9.2

External armature short-circuit braking

Description
External armature short-circuit braking is only available for synchronous motors. It is used
preferably when braking in a hazardous situation, if controlled braking via the drive is no
longer possible (for example, in the event of a power failure, an EMERGENCY OFF, etc.) or
if no regenerative infeed is used. In this case, the motor stator windings are short-circuited
via external braking resistors. This means that an additional resistance is inserted in the
motor circuit that supports reducing the kinetic energy of the motor.
The external armature short circuit is activated via p1231 = 1 (with contactor feedback
signal) or p1231 = 2 (without contactor feedback signal). It is initiated when the pulses are
canceled.
This function controls an external contactor via output terminals, which then short-circuits the
motor through resistors when the pulses are canceled.
Converter cabinet units
Operating Instructions, 03/2012, A5E03263466A
Friction characteristic, value n0
Friction characteristic, value M9
Friction characteristic status word
Friction characteristic, output
Activate friction characteristic
Activate friction characteristic plot
Friction characteristic plot ramp-up/ramp-down time
Friction characteristic plot warm-up period
Functions, Monitoring, and Protective Functions
9.2 Drive Functions
447