Siemens SINAMICS G120 Operating Instructions Manual page 271

Parameter
Manipulating the actual value of the technology controller
p2267
p2268
p2269
p2271
p2270
For further information refer to the function block diagrams 7950 ff of the List Manual.
Autotuning of the PID controller
Autotuning is an inverter function for the automatic optimization of the PID controller.
For active autotuning, the inverter interrupts the connection between the PID controller and
the speed controller. Rather than the PID controller output, the autotuning function provides
the speed setpoint.
Figure 6-40
The speed setpoint results from the technology setpoint and a superimposed rectangular signal
with amplitude p2355. If actual value = technology setpoint ± p2355, the autotuning function
switches the polarity of the superimposed signal. This causes the inverter to excite the process
variable for an oscillation.
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD
Remark
Technology controller upper limit actual value (factory setting: 100 %)
Technology controller lower limit actual value (factory setting: -100 %)
Technology controller gain actual value (factory setting: 100 %)
Technology controller actual value inversion (sensor type)
0: No inversion
1: Inversion actual value signal
If the actual value decreases with increasing motor speed, then p2271 must
be set = 1.
Technology controller actual value function
0: No function
1: √
2: x
2
3: x
3
Autotuning of the PID controller using the example of a filling-level control
Advanced commissioning
6.17 PID technology controller
271