Advanced Settings - Siemens SINAMICS G120D Operating Instructions Manual

Advanced commissioning
8.16 Motor control
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 8-52
Number
p0342[M]
p1452
p1470[D]
p1472[D]
p1496[D]
8.16.2.4

Advanced settings

K - and T adaptation
p n
The K
commissioning, the inverter optimizes the speed controller using the "rotating measurement"
function. If you have performed the rotating measurement, then the K
been set.
You can find additional information in the List Manual, function block diagram 6050.
Droop
The droop function reduces the speed setpoint as a function of the torque setpoint.
Figure 8-44
236
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
- and T adaptation suppresses possible speed controller oscillations. During basic
p n
Effect of droop in the speed controller
): T ≥ 4 · p1452
I I
) step-by-step.
P
Operating Instructions, 10/2020, FW V4.7 SP13, A5E34262100B AH
Factory setting
1
10 ms
0.3
20 ms
0%
- and T adaptation has
p n
Converter with the control units CU240D-2