User Manual of A90 Series Inverter prevail; when the function code is set to 1, the PID parameters will be selected according to the status of the input function “43: PID parameter switching”; when the function code 2 is used, the PID parameters will be selected according to the absolute value |e(k)| (=|setting-feedback|) of the current deviation and the relationship between the function codes F09.12 and F09. Or, the linear difference may be used. In the case of “F09.12≤|e(k)|≤F09.13”, the current PID parameters are obtained through linear interpolation of the first and second groups of parameters. The specific principle is shown by the intermediate segment in Fig. 7-27.
PID parameters Parameter 2 Parameter 1 100.00% 0 Switching deviation 1 Switching deviation 2 |Deviation| Fig. 7-27 Schematic Diagram of Automatic Switching of PID Parameters based on Deviation (F19.11=2) The inverter starts running, and the process PID module constantly outputs the initial PID value (F09.14) for the initial PID holding time (F09.15). Then the output is adjusted by the PID based on the deviation. Specific effects are shown in Fig. 7-28. When the initial PID holding time is set to 0.00s, i.e. F09.15=0.00, the initial PID output function will be invalid.
203 ( e ,Y) 1 1 (e ,Y ) 2 2 Default Function code Function code name Parameter description Unit Attribute setting F09.14 Initial PID value 0.00-100.00 % 0.00 ● F09.15 PID initial value holding time 0.00~650.00 s 0.00 ●