User Manual of EM730 Series Inverter 700FH data range is -100.00% to 100.00%, as detailed in Table 12-31. For the general communication (F10.05=0), the specific feedback percentage is “7005H (communication setting of process PID feedback)”, and the 7005H data range is -100.00% to 100.00%, as detailed in Table 12-31. and the status of the input function “44: PID positive/negative action switching”, as detailed in The process PID action mode depends jointly on the setting of the function code F09.04 Table 7-14. Table 7- 14 Description of PID Positive/Negative Action Note: The deviation in PID control is usually “setting - feedback”.
When the feedback signal is greater than the PID setting, the output frequency of the inverter should decrease for PID balance. Take the water supply control as an example. When the pressure increases, the pressure feedback will increase. The output frequency of the inverter must be decreased to reduce the pressure and keep the constant pressure. In this case, the PID should be set to the positive action. When the feedback signal is greater than the PID setting, the output frequency of the inverter needs to increase for PID balance. Take temperature control as an example. The PID regulator needs to be set to negative action to control the temperature.
240 Function code Function code name Parameter description Unit Default setting Attribute Mailing address F09.04 PID positive and negative action selection 0: positive 1: negative 0 〇 0x0904 F09.04 44: PID positive/negative switching Mode of action Note 0 0 Positive action Both the deviation and output are positive. 0 1 Negative action The deviation is positive and the output is negative. 1 0 Negative action The deviation is positive and the output is negative. 1 1 Positive action Both the deviation and output are positive.