Parameter Explanation
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 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.
p1562 Moment of inertia estimator change time
load (factory setting: 10 ms)
p1563 Moment of inertia estimator load torque positive direction of rotation(factory setting: 0 Nm)
p1564 Moment of inertia estimator load torque negative direction of rotation(factory setting:
0 Nm)
p5310 Moment of inertia precontrol configuration (factory setting: 0000 bin)
.00 1 signal: Activates calculation of the characteristic (p5312 … p5315)
.01 1 signal: Activates moment of inertia precontrol
p5310.00 = 0, p5310.01 = 0 Deactivating moment of inertia precontrol
p5310.00 = 1, p5310.01 = 0 Adapting the moment of inertia precontrol
p5310.00 = 0, p5310.01 = 1 Activating the moment of inertia precontrol.
The characteristic of the moment of inertia precon‐
trol remains unchanged.
p5310.00 = 1, p5310.01 = 1 Activating the moment of inertia precontrol. The
inverter adapts the characteristic in parallel.
Advanced commissioning
6.19 Motor control
SINAMICS G120C converter
280 Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
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