4-217
10-09
PID bias
Range
-100~100
%
10-10
PID Primary delay time
Range
0.00~10.00
%
10-14
PID integral limit
Range
0.0~100.0
%
10-23
PID limit
Range
0.00~100.0
%
10-24
PID output gain
Range
0.0~25.0
10-25
PID reversal output selection
Range
0:
Do not allow the reversal output
1:
Allow the reversal output
10-26
PID target acceleration / deceleration time
Range
0.0~25.5 Sec
PID Adjustments
Gain control:
The error signal (deviation) between the input command (set value) and the actual control value
(feedback). This error signal or deviation is amplified by the proportional gain (P) to control the offset between the
set value and the feedback value.
Integral control:
The output of this control is the integral of the error signal (difference between set value and
feedback value) and is used to minimize the offset signal that is left over from the gain control. When the integral
time (I) is increased, the system response becomes slower.
Differential control:
This control is the inverse from integral control and tries to guess the behavior of the error
signal by multiplying the error with the differential time. The result is added to the PID input. Differential control
slows down the PID controller response and may reduce system oscillation.
Note:
Most applications that PID
control (fan and pump) do not require differential control.
Refer to Figure 4.4.77 for PID control operation
Control
Deviation
t
PID Control
t
I Control
P Control
D
Figure 4.4.77 PID Control