User Manual of EM730 Series Inverter If the input terminal function “41: process PID pause” is valid, the PID will also stop the adjustment. Users need to use these two modes together. The differential (D) component of the PID regulator must not be greater than the PID differential limit (F09.19), in order to avoid the excessive deviation and output at a certain moment to cause system oscillations. If this value is set correctly, the impact of sudden interference on the system can be well suppressed. For better PID regulation, only PD or P adjustment is needed sometimes, while integral adjustment is not needed.
For this reason, the EM730 series inverter has a special integral separation function. When the deviation between the PID setting and feedback is greater than the PID integral separation threshold (F09.20), the integral separation will be valid. That is, the integral (I) adjustment of the PID regulator will be suspended. To facilitate remote control, the input terminal function “42: process PID integration pause” can be used. But if the function code setting is invalid (F09.20=100.00), the input terminal function will not work, as detailed in Table 7-16.
Table 7- 16 Description of Integral Separation Function 245 Function code Function code name Parameter description Unit Default setting Attribute Mailing address F09.19 PID differential limit 0.00~100.00 % 5.00 ● 0x0913 Function code Function code name Parameter description Unit Default setting Attribute Mailing address F09.20 PID integral separation threshold 0.00~100.00 (100.00% = invalid integral separation) % 100.00 ● 0x0914 Method Description F09.20 DI(42) F09.20: PID integral separation threshold; DI (42): Process PID integral pause 100.00% -- The integral (I) is always valid.
0.00% ~ 99.99% Depending on the relationship between |e(k)| and F09.20 as well as the status of the DI function Invalid If |e(k)|>F09.20, the integral separation is valid. Valid The integral separation is valid.