SINAMICS S120 Functi.. - Gregbotos.com

Extended FunctionsArmature short-circuit brake, internal voltage protectionCautionWhen the internal voltage protection is active (p1231 = 3), after the pulses havebeen cancelled, all of the motor terminals are at half of the DC link potential(without internal voltage protection the motor terminals have a no voltagecondition)!!DangerThe 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 thisoperation takes too long, then this can result in thermal overload of the drive.Function diagram overview (refer to the List Manual) 7014 External armature short-circuit (EASC, p0300 = 2) 7015 Internal voltage protection (IVP, p0300 = 2)Overview of important parameters (refer to the List Manual) p1230 BI: Armature short-circuit activation p1231 Armature short-circuit configuration p1235 BI: Armature short-circuit, external contactor feedback signal p1236 Armature short-circuit, external contactor feedback signalmonitoring time p1237 Armature short-circuit, external delay time when opening r1238 Armature short-circuit, external status r1239 CO/BO: Armature short-circuit, status word4-228© Siemens AG 2006 All Rights ReservedSINAMICS S120 Function Manual, 03/2006 Edition