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Functions, monitoring and protective functions
9.3 Drive functions
Parameters
• p0300
• p1230
• p1231
• p1235
• p1236
• p1237
• r1238
• r1239
9.3.10.3
Internal armature short-circuit braking
Description
Internal armature short circuit braking is only available for synchronous motors. It is used
preferably when braking in an emergency, 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 a
half bridge in the power module. This creates additional resistance in the motor circuit, which
helps reduce the kinetic energy of the motor.
The internal armature short circuit is configured via p1231 = 4 and activated via p1230. It is
initiated when the pulses are suppressed.
A prerequisite for the use of the internal armature short circuit is the use of a permanent-
magnet synchronous motor (p0300 = 2xx).
Electric shock due to armature short-circuit braking
When the armature short-circuit is active, all the motor terminals are at half the DC-link
potential after the pulse suppression.
Contact with live parts can result in death or serious injury.
• Observe the general safety instructions.
522
Motor type selection
BI: Armature short-circuit/DC braking activation
Armature short-circuit/DC braking configuration
• 1: External armature short circuit with contactor feedback signal
• 2: External armature short-circuit without contactor feedback signal
BI: External armature short circuit, contactor feedback signal
External armature short circuit, contactor feedback signal monitoring time
External armature short circuit, waiting time when opening
CO: Armature short circuit, external state
CO/BO: Armature short-circuit/DC braking status word
DANGER
Converter cabinet units
Operating Instructions, 11/2017, A5E36652151A
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