Advanced commissioning
7.11 Motor control
SIMATIC ET 200pro FC-2 converter
166
Operating Instructions, 04/2018, FW V4.7 SP10, A5E34257324B AF
Parameter Explanation
.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 calculat-
ing 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
)
p1502
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
p1755
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 settings
Parameter Explanation
p1226
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.
p1560
Moment of inertia estimator accelerating torque threshold value (factory setting: 10%)
p1561
Moment of inertia estimator change time
inertia (factory setting: 500 ms)
The lower that p1561 or p1562 is, the
shorter the moment of inertia estimator
