Advanced Settings - Siemens SINAMICS G120C Operating Instructions Manual

Advanced commissioning
8.20 Motor control
7. Switch off the motor.
8. Set p0340 = 4. The converter again calculates the speed controller parameters.
9. Switch on the motor.
10.Over the complete speed range check as to whether the speed control operates satisfactorily
with the optimized settings.
You have optimized the speed controller.
❒
When necessary, set the ramp-up and ramp-down times of the ramp-function generator
(p1120 and p1121) back to the value before optimization.
Mastering critical applications
The drive control can become unstable for drives with a high load moment of inertia and
gearbox backlash or a coupling between the motor and load that can possibly oscillate. In this
case, we recommend the following settings:
• Increase p1452 (smoothing the speed actual value).
• Increase p1472 (integral time T
• If, after these measures, the speed controller does not operate with an adequate dynamic
performance, then increase p1470 (gain K
Parameters
Table 8-64
Number
p0342[M]
p1452
p1470[D]
p1472[D]
p1496[D]
8.20.3.3

Advanced settings

Overview
Special settings for a pulling load
For a pulling load, e.g. a hoisting gear, a permanent force is exerted on the motor, even
when the motor is stationary.
For a pulling load, we recommend that you use vector control with an encoder.
314
): T
I
Encoderless speed control
Name
Ratio between the total and motor moments of inertia
Speed controller actual speed value smoothing time (enco‐
derless)
Speed controller encoderless operation P gain
Speed controller encoderless operation integral time
Acceleration precontrol scaling
≥ 4 · p1452
I
) step-by-step.
P
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
Factory setting
1
10 ms
0.3
20 ms
0%
SINAMICS G120C Converters