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

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 permanent-magnet synchronous motor (p0300 = 2xx) is required in order to use the
internal armature short-circuit.
When the armature short-circuit is active, after the pulses have been cancelled all the motor
terminals are at half the DC-link potential.
CAUTION
Only short-circuit proof motors may be used.
The Power Module / Motor Module must be designed to handle 1.8 times the short-circuit
current of the motor.
Function diagram
FP 7016
Parameter
• p0300:
• p1230
• p1231
• r1239
Converter cabinet units
Operating Instructions, 03/2012, A5E03263466A
DANGER
Technology functions - Internal armature short circuit
Mot type selection
BI: Armature short-circuit/DC braking activation
Armature short-circuit/DC braking configuration
• 4: Internal armature short-circuit/DC braking
CO/BO: Armature short-circuit/DC braking status word
Functions, Monitoring, and Protective Functions
9.2 Drive Functions
449