Service manual

www.enc.net.cn/en Tel/Fax:[phone] Detailed function description
76
When F3.00=2, Start PID control constant pressure water supply, At this point
the water supply system F3.03 will become the target pressure value. Upper limit
is F3.21Mpa.
F3.04 Min. specified value
Range: 0.0－max.
s
p
ecified value
0.0(%)
F3.05
Corresponding feedback
value of min. s
p
ecified value
Range: 0.0－100.0(%) 0.0(%)
F3.06
Max. specified value value
Range: min. specified
value -100.0
(
%
)
100.0(%)
F3.07
corresponding feedback
value of max. specified value
Range: 0.0%－100.0(%) 100.0(%)
F3.04~F3.07 define relation curve of analog closed-loop provision and
expected feedback. Their set value is percentage of provision and feedback actual
value relative to reference (10V or 20mA).
F3.08 Proportion gain Kp Range: 0.000－9.999 0.150
F3.09 Integral gain Ki Range: 0.000－9.999 0.150
F3.10
Differential gain Kd
Range: 0.000－9.999 0.000
F3.11
Sampling cycle T
Range: 0.01－1.00S 0.10S
The more big Kp proportion gain is, the more quick the response is，but overbig
is prone to bringing surge.
Only applying proportion gain Kp adjustment can’t eliminate offset
completely，can apply integral gain Ki and differential gain to make up of PID
control in order to eliminate residual offset. The bigger Ki is, the more quickly the
system responds to changing offset, but overbig is prone to bringing surge.
Fig.6-16 provision，feedback curve
positive adjusting feedback
corresponding feedback value
of max. specified value
corresponding feedback value
of min. specified
value
max. provision
min. provision
corresponding feedback value
of min. s
p
ecified value
corresponding feedback value
of max. specified value
negative adjusting feedbac
k
max. provision
min.
p
rovision