Siemens SINAMICS S120 Function Manual page 228

Extended Functions
Armature short-circuit brake, internal voltage protection
Caution
When the internal voltage protection is active (p1231 = 3), after the pulses have
been cancelled, all of the motor terminals are at half of the DC link potential
(without internal voltage protection the motor terminals have a no voltage
condition)!
Danger
!
The voltage protection is not switched-out. Kinetic energy is converted into heat
(power loss) in the drive converter and motor. If the power loss is too high or if this
operation takes too long, then this can result in thermal overload of the drive.
Function diagram overview (refer to the List Manual)
S 7014
S 7015
Overview of important parameters (refer to the List Manual)
S p1230
S p1231
S p1235
S p1236
S p1237
S r1238
S r1239
4-228
External armature short-circuit (EASC, p0300 = 2)
Internal voltage protection (IVP, p0300 = 2)
BI: Armature short-circuit activation
Armature short-circuit configuration
BI: Armature short-circuit, external contactor feedback signal
Armature short-circuit, external contactor feedback signal
monitoring time
Armature short-circuit, external delay time when opening
Armature short-circuit, external status
CO/BO: Armature short-circuit, status word
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition