Siemens SINAMICS G120C User Manual

7. Switch o󹪜 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
I
): T
I
≥ 4 · p1452
• If, after these measures, the speed controller does not operate with an adequate dynamic
performance, then increase p1470 (gain K
P
) step-by-step.
Parameters
Table 8-64 Encoderless speed control
Number Name Factory setting
p0342[M] Ratio between the total and motor moments of inertia 1
p1452 Speed controller actual speed value smoothing time (enco‐
derless)
10ms
p1470[D] Speed controller encoderless operation P gain 0.3
p1472[D] Speed controller encoderless operation integral time 20ms
p1496[D] Acceleration precontrol scaling 0%
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.
Advanced commissioning
8.20Motor control
SINAMICS G120C Converters
314 Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK

Siemens SINAMICS G120C Specifications

General

Brand	Siemens
Model	SINAMICS G120C
Category	Inverter
Language	English