Siemens SINAMICS G115D

If you use encoderless vector control with a pulling load, the following settings are required:
• Set the following parameters:
Parameter Description Setting
p1750[0...n] Motor model con󹪝guration Sets the con󹪝guration for the motor model.
Bit07=1: Use speed switchover limits that are
less sensitive to external e󹪜ects.
p1610[0...n] Static torque setpoint (encoder‐
less) [%]
Sets the static torque setpoint for sensorless vec‐
tor control in the low speed range.
Set a value which is higher than the maximum
load torque that occurs.
Factory setting: 50
• When opening the motor holding brake, enter a speed setpoint>0.
For speed setpoint = 0, and with the motor holding brake open, the load drops because the
asynchronous motor rotates with the slip frequency as a result of the pulling load.
• Set the ramp-up and ramp-down times≤10s in the ramp-function generator.
7.20.3.4 Optimizing the operation of the permanent magnet synchronous motor
Overview
An unfavorable parameter setting can lead to malfunctions or unwanted behavior of the motor
during operation of the permanent magnet synchronous motor.
Description
Problem Possible cause Solution
The converter reports the
F07807 fault (fault current, over‐
current or ground fault) during
the standstill measurement of
the motor identi󹪝cation or during
the pole position identi󹪝cation.
The value of the rated motor volt‐
age is too high.
1. Check the motor wiring and
insulation resistance.
2. Start quick commissioning.
3. Reduce the rated motor volt‐
age p0304 by 5V ... 10V.
4. Restart the standstill meas‐
urement of the motor identi‐
󹪝cation or the pole position
identi󹪝cation.
5. If the converter reports the
F07807 fault again, go back
to step 2.
The motor current increases sig‐
ni󹪝cantly when operating at low
speeds continually, despite no
mechanical problems being
present.
You are operating the motor con‐
tinuously at a speed < p1755 or <
15% of the rated speed.
Set p1080 > p1755.
Advanced commissioning
7.20Motor control
SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA 295