8000m Series
- 110 -
Setting Options
0.01~10.00s
F9.06
Differential time (Td)
Factory Setting
0.00s
Setting Options
0.00~10.00s
Proportional gain(Kp): It decides the regulating intensity of the PID regulator. The
higher the Kp is, the larger the regulating intensity is. The value 100.0 indicates
when the deviation between PID feedback and PID setting is 100.0%, the
adjustment amplitude of the PID regulator on the output frequency reference is the
maximum frequency.
Integral time (Ti): It decides the integral regulating intensity of PID controller by
the difference between the feedback variable and the target value. The integral
time refers to the time when the deviation between PID feedback and PID setting is
100.0%, the integral regulator performs continuous adjustment for the time to let
hen the adjustment amplitude reaches the maximum frequency. The shorter the
integral time is, the largerthe regulating intensity is.
Differential time (Td): It decides the regulating intensity of the PID controller on
the deviation changing rate between feedback and target. Differential time is the
time within which the feedback value change reaches 100.0%, and then the
adjustment amplitude reaches the maximum frequency. The longer the differential
time is, the larger the regulating intensity is.
PID is the most commonly used control algorithm in process control, the effect are
different to each part of the algorithm. The following is a brief introduction to the
algorithm principle and commissioning procedure.
Proportional Control(P): With a deviation appears between PID feedback and
setting, PID controller will give an output proportional to the deviation. If the
deviation is stable, the output is also stable. Proportional control can respond
rapidly to the fluctuation of feedback. But with proportional control only, it cannot
achieve zero-deviation control. The higher the proportional gain is, the faster the
regulating speeds is, but if the gain is too high it will result in oscillation. To
commission the proportional control, first it is needed to set the integral time to the
