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The "Armature short-circuit braking" function can be realized internally via the converter or
externally using a contactor circuit with braking resistors.
• Internal armature short-circuit braking: p1231 = 4
The response time of the internal armature short-circuit braking is just a few milliseconds, so
it is much shorter than the response time of a mechanical brake.
To maintain armature short-circuit braking despite a power failure, the 24 V power supply to
the converter must continue even after the power failure.
• External armature short-circuit braking p1231 = 1 or p1231 = 2
Via output terminals, the "External armature short-circuit braking" function controls an
external contactor, which then short-circuits the motor windings through resistors.
With p1231 = 1, the converter monitors the feedback signal of the external contactor. The
motor can only be operated if the external contactor is open.
The converter monitors contactor feedback signals "Contactor is open" and "Contactor is
closed" using signals c1235[0] and c1235[1].
To achieve the highest braking effect, calculate the resistance value R using the following
formula:
R = 5.2882 · 10
n
When using NO contacts as main contacts for the contactor, then the drive is no longer
protected against power failure. Protection against power failure is only
guaranteed when using the NC contacts as the main contacts for the contactor. Inversion of
the digital inputs and digital outputs may be necessary.
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
· p0314 · p0356 · n
-5
= maximum speed used
max
- p0350
max
Functions
14.11 Drive functions
597
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