Siemens SINAMICS G120 Operating Instructions Manual page 280

Setting functions
8.7 Application-specific functions
Function after OFF1 and OFF3 command
The inverter controls the motor holding brake in the following way:
● After the ON command (to switch on motor), the inverter magnetizes the motor.
● After the magnetizing time (p0346), the inverter issues the command to open the brake.
● The inverter keeps the motor at a standstill up until the end of the time in p1216. The
motor holding brake must open within this time.
● At the end of the brake opening time the motor accelerates to the speed setpoint.
● After the OFF command (OFF1 or OFF3) the motor brakes to a standstill.
● When braking, the inverter compares the speed setpoint and the actual speed with the
speed threshold p1226:
If the speed setpoint falls below the threshold p1226, the inverter starts the time p1227.
If the actual speed falls below the threshold p1226, the inverter starts the time p1228.
● As soon as the first of the two times (p1227 or p1228) has elapsed, the inverter issues
the command to close the brake.
The motor comes to a standstill but remains switched on.
● After the brake closing time p1217, the inverter switches off the motor.
The motor holding brake must close within this time.
Figure 8-26
280
Controlling the motor holding brake when the motor is switched on and off
Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB