Veichi Electric AC60 series Manual page 141

feedback voltage is 4.5V, the largest range of the sensor is 20mpa
Nixie light display value =（4.5-0.5）×20/(9-0.5)=9.4mpa
H-19 Proportion gain P
H-20 Integral time constant
I
H-21 Differential gain D
The adjustable parameters, which are control by PID，should be set based
on actual characteristics of the system.
Proportion gain is the parameter which determines the impact degree of P
action to deviations. When gain is large, it responds quickly, but vibrates.
When gain is small, respond will delay.
Integral time constant I decides the I action effect. When integral time
is large, it responds slowly; Besides, the control power to the exterior
disturbance is getting weaker. When integral is small, it responds fast.
Frequency inverter will vibrate if the integral is too small.
Differential gain D; when the deviation of PID feedback quantity and PID
given quantity changes, The output and the change rate of deviation are
proportionally adjusted. This adjustment is only related to the direction and
size of the deviation change and has nothing to do with the direction and size
of the deviation itself. While the feedback signal changes, differential
adjustment is used to adjust according the change trend to restrain the change
of feedback signal.Please be careful to use the differential adjustment.
Because it easily amplies the system disturbance, especially disturbance with
higher changing frequency.
Range ：0.1～100.0
Range ：0.1～100.0
second
Range ：0.0 ～ 10.0
137
Factory
setting：20.0
Factory settin：
2.0second
Factory
setting：0.0