Functions, monitoring, and protective functions
9.2 Drive functions
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
507
Technology functions - External armature short circuit
p0300:
p1230
-circuit/DC braking activation
p1231
re short-circuit/DC braking configuration
1: External armature short-circuit with contactor feedback signal
2: External armature short-circuit without contactor feedback signal
p1235
BI: External armature short
-circuit, contactor feedback signal
p1236
ternal armature short-circuit, contactor feedback signal monitoring time
p1237
-circuit, delay time when opening
r1238
CO: External armature short
-circuit state
r1239
-circuit/DC braking status word
Internal armature short-circuit braking
Description
Internal 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 a half-bridge in the power unit. This means that an additional resistance is inserted in the
motor circuit that supports reducing 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 canceled.
A prerequisite for the use of the internal armature short circuit is the use of a permanent-
magnet synchronous motor (p0300 = 2xx).
Danger to life due to electric shock for armature short-circuit braking
When the armature short-circuit is active, after the pulses have been cancelled all the motor
terminals are at half the DC link potential.
Contact with live parts can result in death or serious injury.
• Observe the general safety instructions.
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