Motor Holding Brake - Siemens Sinamics CU240D-2 DP Operating Instructions Manual

6.8

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 6-17
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. When braking, the inverter compares the speed setpoint and the actual speed with the
"standstill detection speed threshold" p1226:
– Speed setpoint < p1226: The "standstill detection monitoring time" p1227 starts
– Current speed < p1226: The "pulse cancellation deceleration time" p1228 starts
Converter with the control units CU240D-2
Operating Instructions, 04/2018, FW V4.9 SP10, A5E34262100B AF
Motor holding brake function
Advanced commissioning
6.8 Motor holding brake
141