Internal Armature Short-Circuit Braking - Siemens SINAMICS S120 Function Manual

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Basic functions

8.12 Armature short-circuit

Internal armature short-circuit braking

With the "Internal armature short-circuit braking" function, the motor windings are short-

circuited via a Motor Module.

Supported Motor Modules

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

● Short-circuit-proof motors (p0320 < p0323)

● One of the following motor types is used:

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

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

● The maximum current of the Motor Module (r0209.0) must be at least 1.8x the motor short-

circuit current (r0331).

Internal short-circuit braking despite power failure

If armature short-circuit braking should still be maintained despite a power failure, you must

buffer the 24 V power supply for the Motor Module. For this purpose, you can use for

example a dedicated SITOP unit for the Motor Module or a Control Supply Module (CSM).

Configuring the function

Carry out the following steps to configure the function:

Setting the function

The internal armature short-circuit braking is set with p1231 = 4.

Activating the function

The function is activated and initiated if the signal source of p1230 is set to a "1" signal.

Deactivating the function

The function is deactivated if the signal source of p1230 is set to a "0" signal. When triggered

by a fault, the fault must have been removed and acknowledged.

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

Drive functions