Motor Holding Brake - Siemens SINAMICS G120C USS/MB Operating Instructions Manual

Advanced commissioning

6.12 Motor holding brake

6.12 Motor holding brake
The motor holding brake holds the motor in position when it is switched off.
When the "Motor holding brake" function is correctly set, the motor remains switched on as
long as the motor holding brake is open. The inverter only switches the motor off when the
motor holding brake is closed.
Function
Figure 6-21
After the ON command
1. With the ON command, the inverter switches the motor on.
2. At the end of the "motor excitation build-up time" (p0346), the inverter issues the command
to open the brake.
3. The inverter keeps the motor at a standstill until the "motor holding brake opening time"
p1216 has ended.
The motor holding brake must be opened within time p1216.
4. The inverter accelerates the motor to the speed setpoint.
After the OFF1 or OFF3 command
1. The inverter brakes the motor down to a standstill using the OFF1 or OFF3 command.
2. If the actual speed is less than 20 rpm, then the inverter issues the command to close the
brake. The motor comes to a standstill but remains switched on.
3. After the "motor holding brake closing time" p1217, the inverter switches off the motor.
The motor holding brake must close within the time p1217.
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Motor holding brake function
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
SINAMICS G120C converter