Siemens SINAMICS G120 Operating Instructions Manual page 257

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.
Parameter
r0333
p0341
p0342
p1400
r1407
r1493
p1496
p1498
p1502
p1775
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
Explanation
Rated motor torque [Nm]
Motor moment of inertia (factory setting: 0 kgm
The inverter sets the parameter when selecting a listed motor. The parameter is then
write-protected.
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
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
motor switched off:
J = p0341 × p0342 + p1498
0
If the load torque can change when the motor is switched off, set
p1400.22 = 0.
.24 1 signal Accelerated moment of inertia estimator is active.
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: Accelerated moment of inertia estimator is active.
Total moment of inertia, scaled
r1493 = p0341 × p0342 × p1496
Acceleration precontrol scaling (factory setting: 0%)
According to rotating measurement of the motor data identification is p1496 = 100%.
Load moment of inertia (factory setting: 0 kgm
Freeze moment of inertia estimator (factory setting: 0)
If the load torque changes when accelerating the motor, set this signal to 0.
0 signal Moment of inertia estimator is active
1 signal Determined moment of inertia is frozen
Motor model changeover speed encoderless operation
Defines the switchover between open-loop and closed-loop controlled operation of
the encoderless vector control.
When selecting the closed-loop speed control, the inverter sets p1755 = 13.3% ×
rated speed.
Advanced commissioning
6.5 Motor control
)
2
)
2
when
0
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