(2) Integral gain
Integral (I) gain () is integral gain for PID control.
This gain acts to make the deviation which remains in proportional operation (remained
deviation offset) to zero. Setting this parameter at a large value gives smaller remained deviation
offset, but setting at a too large value may result in an unstable phenomenon like hunting.
Feedback amount
(3) Differential gain
Differential (D) gain () is differential gain for PID control.
This gain acts to improve the response to sudden change of the deviation. Setting this
parameter at a too large value may result in an unstable phenomenon in which output frequency
is greatly unsteady.
The last deviation
ー This Time Deviation
Feedback amount
(4) Delay filter
Delay filter () acts to soften a rapid change of the deviation (linear delay function).
Usually, it is not necessary to change the setting. A small setting value makes processing fast, a
large setting value makes it slow.
(5) PID deviation upper limit
PID deviation upper limit () is upper limit over positive deviation.
It limits the instantaneous value of deviation. Usually, it is not necessary to change the setting.
(6) PID deviation lower limit
PID deviation lower limit () is upper limit over negative deviation.
It limits the instantaneous value of deviation. Usually, it is not necessary to change the setting.
is small.
is
large.
Remained deviation offset
Time
Time
is large.
is small.
Time
C-12
Reference of process
amount