Siemens SINAMICS G120 Operating Instructions Manual page 307

Low voltage inverters built-in units with cu250s-2 control units and encoder evaluation

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If you use encoderless vector control with a pulling load, then the following settings are required:

● Set the following parameters:

● When opening the motor holding brake, enter a speed setpoint > 0.

For speed setpoint = 0, and with the motor holding brake open, the load drops because the

induction motor rotates with the slip frequency as a result of the pulling load.

● Set the ramp-up and ramp-down times ≤ 10 s in the ramp-function generator.

● If, in quick commissioning, you have selected application class Dynamic Drive Control then

set p0502 = 1 (technological application: dynamic starting or reversing).

Converter with the CU250S-2 Control Units

Operating Instructions, 04/2018, FW V4.7 SP10, A5E31759476B AG

Motor model configuration

Static torque setpoint (encoderless) (Factory setting: 50 %)

Set a value which is higher than the maximum load torque that occurs.

Use speed switchover limits that are less sensitive to external effects

Advanced commissioning

6.21 Motor control