Operating Instructions

6.17.1 Autotuning the PID technology controller
Overview
Autotuning is an inverter 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
To change the function settings, you can use an operator panel or a PC tool, for example.
Function description
For active autotuning, the inverter 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 6-35 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 inverter to excite the process
variable for an oscillation.
Advanced commissioning
6.17 PID technology controller
Converter with the CU230P-2 Control Units
284 Operating Instructions, 04/2018, FW V4.7 SP10, A5E34257946B AF