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15.2.3 Two-position interpulse controller for pH
Application
•
Downward control direction of pH value using
acid.
•
Control of the dosing pump by power supply.
Description
•
The actual value of the required pH value
exceeds the setpoint:
– Dosing pump for acid is switched on for brief
periods.
•
The measured value deviates from the setpoint:
– Dosing pump runs longer during the interpulse
period.
– With a large deviation, the pump runs
continuously.
Fig. 55
Two-position interpulse controller for pH
Parameter settings
TM0
3
7
110
16
13
Off
On
Off
On
Off
On
{
SP 1
Deviation from
setpoint
Interpulse period
Switching status of the pump.
pH value
SP 1
Required pH value, e.g. 50 % (correlates with pH 7.00).
Pulse frequency for SP 1
0
SP 2
-
*)
Pulse frequency for SP 2
-
X
p
According to local conditions, e.g. 100 %
• Higher setting results in smaller control steps.
• Lower setting results in larger control steps.
T
n
According to local conditions, e.g. 300 sec
• Higher setting results in slower control.
• Lower setting results in faster control.
T
v
0
Hysteresis
e.g. 1 %
Interpulse period
e.g. 10 sec
Actuating time
0
Minimum pulse width
≥
0.3 sec
Required code functions
None
Other code functions
As required
*)
"-": without function (no setting required)
