Siemens SINAMICS G120XA - Autotuning the PID Technology Controller; Additional Functions; Autotuning Using Closed-Loop Level Control as Example

6.5.1.1 Autotuning the PID technology controller
Overview
Autotuning is a converter function for the automatic optimization of the PID technology
controller.
Precondition
Additional functions
● The motor closed-loop control is set
● The PID technology controller must be set the same as when used in subsequent operation:
– The actual value is interconnected.
– Scalings, filter and ramp-function generator have been set.
– The PID technology controller is enabled (p2200 = 1 signal).
Tools
One of the commissioning tools is needed to change the function settings.
Function description
For active autotuning, the converter interrupts the connection between the PID technology
controller and the speed controller. Instead of the PID technology controller output, the
autotuning function specifies the speed setpoint.
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Figure 6-46 Autotuning using closed-loop level control as example
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 converter to excite the
process variable for an oscillation.
Advanced commissioning
6.5 Technology controller
SINAMICS G120XA converter
258 Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB