Siemens SINAMICS G115D Operating Instructions Manual page 248

Advanced commissioning
6.17 Motor control
Parameter
p1502[0...n]
p1755[0...n]
Advanced settings
Parameter
p1226[0...n]
p1560[0...n]
p1561[0...n]
p1562[0...n]
p1563[0...n]
p1564[0...n]
246
Description
BI: Freeze moment of inertia
estimator
Motor model changeover
speed encoderless operation
[rpm]
Description
Threshold for zero speed
detection [rpm]
Moment of inertia estimator
accelerating torque thresh-
old value [%]
Change time for moment of
inertia for moment of inertia
estimator [ms]
Change time for the load
torque for moment of inertia
estimator [ms]
Moment of inertia estimator
load torque positive direc-
tion of rotation [Nm]
Moment of inertia estimator
load torque negative direc-
tion of rotation [Nm]
Setting
Sets the signal source to freeze the estimated moment
of inertia.
0 signal: Moment of inertia estimator is active
1 signal: Determined moment of inertia is frozen
If the load torque changes when accelerating the mo-
tor, set this signal to 0.
Factory setting: 0
Defines the switchover between open-loop and closed-
loop controlled operation of the encoderless vector
control.
When selecting the closed-loop speed control, the
converter sets p1755 = 13.3% × rated speed.
Factory setting: 210000.00
Setting
Sets the speed threshold for the standstill identifica-
tion.
The moment of inertia estimator only measures the
load torque for speeds ≥ p1226.
p1226 also defines from which speed the converter
switches-off the motor for OFF1 and OFF3.
Factory setting: 20
Sets the threshold for the accelerating torque for the
moment of inertia estimator.
Factory setting: 10
Sets the change time for the
moment of inertia for the
moment of inertia estimator.
Factory setting: 500
Sets the change time for the
load torque for the moment
of inertia estimator.
Factory setting: 10
Display and connector output for the monitored load
torque in the positive direction of rotation.
Factory setting: 0
Display and connector output for the monitored load
torque in the negative direction of rotation.
Factory setting: 0
Operating Instructions, 09/2020, FW V4.7 SP13, A5E48681219B
The lower that p1561
or p1562 is, the shorter
the moment of inertia
estimator measure-
ments.
The larger p1561 or
p1562 is, the more
accurate the results
provided by the mo-
ment of inertia estima-
tor.
SINAMICS G115D distributed drive