Siemens SINAMICS G120C Operating Instructions Manual page 322

Advanced commissioning
8.20 Motor control
Figure 8-57
When using the moment of inertia estimator, we recommend that you also activate the
friction characteristic.
How does the converter calculate the load torque?
Figure 8-58
At low speeds, the converter calculates the load torque M
The calculation takes place under the following conditions:
• Speed ≥ p1226
• Acceleration setpoint < 8 1/s
• Acceleration × moment of inertia (r1493) < 0.9 × p1560
320
Overview of the function of the moment of inertia estimator
Friction characteristic (Page 316)
Calculating the load torque
(≙ speed change 480 rpm per s)
2
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
from the actual motor torque.
L
SINAMICS G120C Converters