Siemens SIMATIC ET 200pro FC-2 Operating Instructions Manual page 165

When using the moment of inertia estimator, we recommend that you also activate the
friction characteristic.
How does the inverter calculate the load torque?
Figure 7-34
At low speeds, the inverter 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
How does the inverter calculate the moment of inertia?
Figure 7-35
SIMATIC ET 200pro FC-2 converter
Operating Instructions, 04/2018, FW V4.7 SP10, A5E34257324B AF
Friction characteristic (Page 159)
Calculating the load torque
Calculating the moment of inertia
(≙ speed change 480 rpm per s)
2
Advanced commissioning
7.11 Motor control
from the actual motor torque.
L
163