6.19.3.3 Advanced settings
Special settings for a pulling load
For a pulling load, e.g. a hoisting gear, a permanent force is exerted on the motor, even when
the motor is stationary.
For a pulling load, we recommend that you use vector control with an encoder.
If you use encoderless vector control with a pulling load, then the following settings are required:
● Set the following parameters:
Par. Explanation
p1750 Motor model configuration
Bit 07 = 1 Use speed switchover limits that are less sensitive to external effects
p1610 Static torque setpoint (encoderless) (Factory setting: 50 %)
Set a value which is higher than the maximum load torque that occurs.
● 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).
Advanced commissioning
6.19 Motor control
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF 273
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