Siemens SINAMICS G120 Operating Instructions Manual page 314
Low voltage inverters
built-in units with cu250s-2 control units and
encoder evaluation
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- List manual (1256 pages) ,
- Manual (732 pages) ,
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Advanced commissioning
6.21 Motor control
Parameter
r1407
r1493
p1496
p1498
p1502
p1755
Advanced settings
Parameter
p1226
p1560
p1561
p1562
p1563
p1564
312
Explanation
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.
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.
Explanation
Standstill detection, speed threshold (factory setting: 20 rpm)
The moment of inertia estimator only measures the load torque for speeds ≥ p1226.
p1226 also defines from which speed the inverter switches-off the motor for OFF1 and
OFF3.
Moment of inertia estimator accelerating torque threshold value (factory setting: 10%)
Moment of inertia estimator change time
inertia (factory setting: 500 ms)
Moment of inertia estimator change time
load (factory setting: 10 ms)
Moment of inertia estimator load torque positive direction of rotation (factory setting:
0 Nm)
Moment of inertia estimator load torque negative direction of rotation (factory setting:
0 Nm)
)
2
The lower that p1561 or p1562 is, the short‐
er the moment of inertia estimator meas‐
urements.
The larger p1561 or p1562 is, the more ac‐
curate the results provided by the moment
of inertia estimator.
Converter with the CU250S-2 Control Units
Operating Instructions, 04/2018, FW V4.7 SP10, A5E31759476B AG
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