Siemens SINAMICS S120 Function Manual page 212

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Table of Contents

Basic functions

6.9 Armature short-circuit brake, internal voltage protection, DC brake

External armature short-circuit braking

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

This function controls an external contactor via output terminals, which then short-circuits the

motor through resistors when the pulses are canceled. Armature short-circuit braking has the

advantage with respect to a mechanical brake that at the start of braking (at a high speed),

the braking effect is initially high. However, at lower speeds, the braking effect is significantly

decreases - this is the reason that we recommend a combination with a mechanical brake.

A prerequisite for the use of the external armature short-circuit is:

● One of the following motor types was parameterized:

In case of incorrect parameterization (e.g. induction motor and external armature short-circuit

selected), a fault message 7906 "Armature short-circuit / DC brake parameterization error" is

(r0046.19 = 1)

External armature short-circuit braking with/without contactor feedback signal

Integrated voltage protection (booksize)

For detailed information about integrated voltage protection, please refer to chapter

"Integrated voltage protection".

– Rotating permanent-magnet synchronous motor (p0300 = 2xx)

– Linear permanent-magnet synchronous motor (p0300 = 4xx)

Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5

Drive functions