Siemens CU240B-2 - Page 313

Advanced commissioning
6.7 Application-specific functions
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
313
Parameter
Remark
p2350
PID Autotune Enable
(Factory setting: 0)
Automatic controller setting based on the "Ziegler Nichols" method.
After completion of the autotuning, the inverter sets p2350 = 0.
0: No function
1: Controller setting after completion of the autotuning:
The process variable follows the setpoint after a sud-
den setpoint change (step function) relatively quickly,
however with an overshoot.
2: Faster controller setting than for p2350 = 1 with larger
overshoot of the controlled variable.
3: Slower controller setting than for p2350 = 1. Overshoot
of the controlled variable is, to a large extent, avoided.
4: Controller setting after completion of the autotuning as
for p2350 = 1. Optimize only the P and I action of the
PID controller.
p2354
PID tuning timeout length
(Factory setting: 240 s)
Monitoring time for the process response.
p2354 must be greater than half the time period of the process variable oscillation.
p2355
PID tuning offset
(Factory setting: 5%)
Autotuning offset.
p2355 must be sufficiently large so that the amplitude of the process variable oscil-
lation signal can be differentiated from any superimposed noise.