OEM OPM223, Руководство по эксплуатации

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OPM223/253 Operation
49
Neutralisation controller
During neutralisation control, the pH value of a medium is kept constant by dosing acid and
alkali. Two separate actuating signals are required for this task, one for acid and one for alkali.
The neutralisation controller is a controller with two relay contacts and is specially designed for
this task. The P(ID) controller is available as the controller.
The values for the control gain K
p
for acid and alkali can be set separately. Integral action time
T
n
and derivative action time T
v
apply to both controllers (see "P(ID) controller" section).
The "neutral Zone" is located between the set values 1 and 2. There is no acid or alkali dosing
(Y = 0, see Fig. 37) in the "neutral zone" with a controller without integral components (P, PD).
In the case of a controller with an integral component (PI, PID), there is constant alkali/acid
dosing (Y
new
= Y
old
). The behaviour of the I-component within the neutral zone depends on the
process type (inline/batch).
The "neutral zone" can be shifted as desired in the X direction via set point 1 and 2.
!
Note!
Neutralisation control is only possible with relays 1 and 2.
C07-OxM2x3xx-05-06-00-xx-009.eps
Fig. 37: Control characteristic of a proportional neutralisation controller
1
2
3
Neutral zone
Set point 1
Set point 4
5
6 Set point 2
Control contact 1 for alkali
Control contact 2 for acid
Y [%]
X
100
50
0
1
2 3
4
5
6
Coding Field Setting range
(Factory settings, bold) Display Info
R
RELAY function
group
Relay contact settings.
R1
Select contact to be
configured
Rel1
Rel2
Rel3
Rel4
Rel3 (water) and Rel4 (cleaner) are only
available with the relevant version of the
transmitter.
If Chemoclean is used as the cleaning
method, Rel4 is not available.
R2 (1)
Configure limit
contactor for pH/
ORP measurement
LC PV = limit contactor
pH/ORP
(1)
LC C = limit contactor T (2)
PID controller (3)
Timer (4)
Clean = Chemoclean (5)
Neutra controller (6)
PV = process value
If Rel4 is selected in the R1 field,
Clean = Chemoclean cannot be
selected.
By confirming with ENTER, another
relay function already switched on is
switched off and its settings are reset to
the factory settings.
R
RELAIS
R1
Sel . Relay
Rel1
R2
Sel . Type
LC PV