User Manual of EM760 High-Performance Inverter 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. For a variety of complex scenes, two sets of PID parameters have been introduced into the process PID module. Switching or linear interpolation ofthe two sets ofparameters can be performed according to the function setting (F09.11) and input conditions [e.g. input function “43: PID parameter switching”, and deviation e(k)). See the instruction below for details. 90 0 0 1 Negative action The deviation is positive and the output is negative. 0 1 0 Negative action The deviation is positive and the output is negative. 0 1 1 Positive action Both the deviation and output are positive.
1 0 0 Negative action The deviation is positive and the output is negative. 1 0 1 Positive action Both the deviation and output are positive. 1 1 0 Positive action Both the deviation and output are positive. 1 1 1 Negative action The deviation is positive and the output is negative. Function code Function codename Parameter description Unit Default setting Attribute F09.05 Proportional gain 1 0.00~100.00 0.40 ● F09.06 Integral time 1 0.000 to 30.000; 0.000: no integral s 2.000 ● F09.07 Differential time 1 0.000~30.000 ms 0.000 ● F09.08 Proportional gain 2 0.00~100.00 0.40 ● F09.09 Integral time 2 0.000 to 30.000; 0.000:
no integral s 2.000 ● F09.10 Differential time 2 0.000~30.000 ms 0.000 ● F09.11 PID parameter switching conditions 0: no switching 1: switching via digital input terminal 2: automatic switching according to deviation 3: Automatic switching by frequency 0 ● F09.12 PID parameter switching deviation 1 0.00~F09.13 % 20.00 ● F09.13 PID parameter switching deviation 2 F09.12~100.00 % 80.00 ●