Procedure
To activate the moment of inertia estimator, proceed as follows:
1. Set p1400.18 = 1
2. Check: p1496 ≠ 0
3. Activate the acceleration model of the speed controller pre-control: p1400.20 = 1.
You have activated the moment of inertia estimator.
The most important settings
Parameter Explanation
r0333 Rated motor torque [Nm]
p0341 Motor moment of inertia (factory setting: 0 kgm
2
)
The inverter sets the parameter when selecting a listed motor. The parameter is then
write-protected.
p0342 Moment of inertia ratio, total to motor (factory setting: 1)
Ratio of moment of inertia load + motor to moment of inertia of motor without load
p1400 Speed control configuration
.18 1 signal: Moment of inertia estimator active
.20 1 signal: Acceleration model on
.22 1 signal Moment of inertia estimator retain value when motor switched off
0 signal Moment of inertia estimator reset value to initial value J
0
when motor
switched off:
J
0
= p0341 × p0342 + p1498
If the load torque can change when the motor is switched off, set
p1400.22 = 0.
.24 1 signal Shortened moment of inertia estimation is active.
p1400.24 = 1 reduces the duration of the moment of inertia estimation.
Disadvantage: If the accelerating torque is not constant while calculating
the moment of inertia, the calculation of the moment of inertia using
p1400.24 = 1 is less precise.
r1407 Status word, speed controller
.24 1 signal: Moment of inertia estimator is active
.25 1 signal: Load estimator is active
.26 1 signal: Moment of inertia estimator is engaged
.27 1 signal: Shortened moment of inertia estimation is active.
r1493 Total moment of inertia, scaled
r1493 = p0341 × p0342 × p1496
p1496 Acceleration precontrol scaling (factory setting: 0%)
According to rotating measurement of the motor data identification is p1496 = 100%.
p1498 Load moment of inertia (factory setting: 0 kgm
2
)
Advanced commissioning
6.19 Motor control
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF 279
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