User Manual of A90 Series Inverter 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 A90 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 7-14. Table 7-14 Description of Integral Separation Function The PID setting change time refers to the time required for the setting to change from 0.0% to 100.0%, similar to the acceleration and deceleration time function. When the PID setting changes, the actual PID setting will change linearly, thus reducing the impact of sudden changes on the system.
Smoothing is invalid during the initial setting. The setting will change from the current feedback value during the start. 205 Function Function code Default setting Parameter description Unit Attribute code name F09.20 PID integral separation threshold 0.00-100.00 (100.00% = invalid integral separation) % 100.00 ● 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.
Default Function code Function code name Parameter description Unit Attribute setting F09.21 PID setting change time 0.000-30.000 s 0.000 ●