Siemens SINAMICS G120D - Page 230

Setting functions
8.8 Application-specific functions
Converter with control units CU250D-2
230 Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
Procedure
Proceed as follows to commission the "Motor holding brake" function using an operator
panel.
1. Set p1215 = 1.
The "Motor holding brake" function" is enabled.
2. Check the magnetizing time p0346; the magnetizing time is pre-assigned during
commissioning and must be greater than zero.
3. Take the opening and closing times of the connected brake from the technical data for the
motor holding brake.
– Depending on the brake size, brake opening times lie between 25 ms and 500 ms.
– Depending on the brake size, brake closing times lie between 15 ms and 300 ms.
4. Set the following parameters in the inverter to match the opening and closing times of the
brake:
– Opening time ≤ p1216.
– Closing time ≤ p1217.
5. Switch on the motor.
6. Check the acceleration behavior of the drive immediately after the motor has been
switched on:
– If the brake opens too late, the inverter accelerates the motor against the closed brake
which results in a jerky motion.
In this case, increase the opening time p1216.
– After opening the brake, if the motor waits too long before it accelerates the motor,
then reduce the opening time p1216.
7. If the load sags after switching on the motor, then you must increase the motor torque
when opening the motor holding brake. Depending on the control mode, you must set
different parameters:
– U/f operation (p1300 = 0 to 3):
Increase p1310 step-by-step.
Increase p1351 step-by-step.
– Vector control (p1300 ≥ 20):
Increase p1475 in small steps.
8. Switch off the motor.
9. Check the braking behavior of the drive immediately after the motor has been switched
off:
– If the brake closes too late, the load briefly sags before the brake closes.
In this case, increase the closing time p1217.
– After closing the brake, if the motor waits too long before it switches off the motor,
then reduce the closing time p1217.
You have commissioned the "Motor holding brake" function.