User Manual of A90 Series Inverter
205
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.
Function
code
Function code
name
Parameter description
Unit
Default
setting
Attribute
F09.20
PID integral
separation
threshold
0.00-100.00 (100.00% =
invalid integral separation)
%
100.00
●
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
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.
Function code Function code name
Parameter description
Unit
Default
setting
Attribute
F09.21
PID setting change time 0.000-30.000
s
0.000
●
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.
