AC90 TENSION CONTROL FREQUENCY INVERTER MANUAL
Function Parameter specifications
135
PID CENTRE ALIGN
PID feedback
lowest limit
0%
PID setting
40%
PID feedback
highest limit
100%
after centre align
before centre align
0%
E=
50%
-50%
E=
0%
0%
E=
40%
-60%
E=
0%
LED “0000” digit: reserved
Fb.06 PID
preset
frequency
Setting range: 0.00-max frequency
Factory set: 50.00Hz
Fb.07
PID preset frequency running
time
Setting range: 0.0-6500.0s
Factory set: 0.0s
While it defines as PID start running, frequency ACC to PID pre-set frequency
[Fb.06]
according to ACC time 1. After
setting
[Fb.07]
time, it runs as PID closed loop trait.
Fb.08
Proportion gain: P
Setting range: 0.00-100.00 Factory
set: 1.00
Fb.09
Integral time: I
Setting range: 0.01-10.00s Factory
set: 0.10s
Fb.10
Differential coefficient : D
Setting range: 0.00-10.00s Factory
set: 0.00s
Proportion gain P:
It decides the impact of P act to bias. Response is quicker while gain is bigger. But there will be
surge while it is too big. Response is slower while gain is smaller.
Integral time I:
It decides the size of effect of I act. Response is slower and control ability for out disturbance while I is
big. Response is quicker while I is small. But there will be surge if it is too small.
Differential coefficient D:
While bias of PID feedback and PID given is changing, it adjusts change rate of output and
bias pro rata. It is related to direction and size of bias change, not related to direction and size of bias itself. Use it
carefully for it easily magnifies the disturbance.
