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Functions
14.10 Closed-loop drive control
How does the converter calculate the load torque?
Figure 14-155
In the case of small speed changes, the converter calculates the load torque M
actual motor torque.
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 converter calculate the moment of inertia?
Figure 14-156
In the case of larger speed changes, the converter initially calculates the accelerating torque
M
by subtracting load torque M
B
M
= M
B
558
Calculation of the load torque
Calculation of the moment of inertia
- M
- M
M
L
R
(≙ speed change 480 rpm per s)
2
and friction torque M
L
R
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
L
from motor torque M
:
M
SINAMICS G220 converter
from the
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