Internal Armature Short-Circuit Braking - Siemens SINAMICS G150 Operating Instructions Manual

Function diagram
FP 7014
Parameters
• p0300:
• p1230
• p1231
• p1235
• p1236
• p1237
• r1238
• r1239
9.2.9.3

Internal armature short-circuit braking

Description
Internal armature short-circuit braking is only available for synchronous motors. It is used
preferably when braking in 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.
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
Technology functions - External armature short circuit
Mot 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, delay time when opening
CO: External armature short-circuit state
CO/BO: Armature short-circuit/DC braking status word
DANGER
Functions, monitoring, and protective functions
9.2 Drive functions
507