Function
From the actual speed, the actual motor torque and the frictional torque of the load, the
inverter calculates the total moment of inertia of the load and motor.
Figure 6-55
When using the moment of inertia estimator, we recommend that you also activate the
friction characteristic.
Calculating the load torque
Distributed converter for SIMOGEAR geared motors
Operating Instructions, 09/2017, FW V4.7.9, A5E31298649B AH
Overview of the function of the moment of inertia estimator
Friction characteristic (Page 244)
At low speeds, the inverter calculates the load torque
M
from the actual motor torque.
L
The calculation takes place under the following condi-
tions:
• Speed ≥ p1226
• Acceleration setpoint < 8 1/s
480 rpm per s)
• Acceleration × moment of inertia (r1493) < 0.9 ×
p1560
Advanced commissioning
6.17 Motor control
(≙ speed change
2
247