Siemens SINAMICS G115D Operating Instructions Manual page 306

Advanced commissioning
7.20 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]
304
Description
BI: Freeze moment of inertia esti‐
mator
Motor model changeover speed en‐
coderless operation [rpm]
Description
Threshold for zero speed detection
[rpm]
Moment of inertia estimator accel‐
erating torque threshold 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 direction of rota‐
tion [Nm]
Moment of inertia estimator load
torque negative direction of rota‐
tion [Nm]
Setting
Sets the signal source to freeze the estimated mo‐
ment 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
motor, set this signal to 0.
Factory setting: 0
Defines the switchover between open-loop and
closed-loop controlled operation of the encoder‐
less 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 identifi‐
cation.
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 iner‐
tia estimator.
Factory setting: 500
Sets the change time for
the load torque for the
moment of inertia esti‐
mator.
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
SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA
The lower that p1561 or
p1562 is, the shorter
the moment of inertia
estimator measure‐
ments.
The larger p1561 or
p1562 is, the more accu‐
rate the results provided
by the moment of iner‐
tia estimator.