Direct Acting (Acid); Dual (Bi-Directional) Pi Controller; Ouput Assignment - ABB AnalyzeIT AX460 User Manual
Single input ph/redox (orp) analyzer
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...1 INTRODUCTION
...1.2 Dual (Bi-directional) PI Controller – Figs 1.4 and 1.5
Dual (bi-directional) control is used if the pH value must be controlled within specified upper and lower limits. The minimum span
between set points is 0.5pH.
100%
Control
Output
Reverse Acting
Base Controller
(Output 1)
0%
0pH
1.3 Ouput Assignment
For single PID control, the output signal is assignable to either relay 1 or analog output 1. For dual (bi-directional) PI control, the output
signals are assignable to any two of the following outputs: relay 1, relay 2, analog output 1 and analog output 2 – see Table 1.1 and
Section 4.3.
S
n i
g
e l
P
D I
C
o
t n
o r
l l
r e
D
u
l a
B (
- i
i d
e r
t c
o i
n
a
) l
I P
C
o
O
u
p t
t u
T
y
p
e
(
i D
e r
t c
A
t c
n i
g
–
A
c
d i
C
o
t n
A
n
a
o l
g
T
m i
e
r o
P
l u
e s
A
n
a
o l
g
T
m i
e
r o
P
l u
e s
4
Fig. 1.5 Dual (Bi-directional) PI Control
O
u
p t
t u
T
y
p
e
A
n
a
o l
g
T
m i
e
r o
P
l u
e s
t n
o r
l l
r e
O
u
p t
t u
o r
e l l
) r
R (
e
v
e
s r
e
A
t c
n i
g
–
B
A
n
a
o l
A
n
a
o l
T
m i
e
r o
T
m i
e
r o
Table 1.1 Output Assignment
6pH
8pH
R
e
a l
y
1
T
y
p
e
R
e
a l
y
1
a
s
e
C
o
t n
o r
e l l
) r
g
g
P
l u
e s
P
l u
e s
Direct Acting
Acid Controller
(Output 2)
R
e
a l
y
2
R
e
a l
y
3
A
O
R
e
a l
y
2
R
e
a l
y
3
A
O
14pH
1
A
O
2
1
A
O
2
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