Siemens SINAMICS G120C DP

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