En
gl
is
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G
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54
15.2.11 Continuous controller
Application
•
Upward control direction of chlorine
concentration using chlorine bleaching leach.
•
Control of dosing pump via the current input.
Description
•
The actual value of the required chlorine
concentration falls below the setpoint:
– The continuous current signal is generated
proportional to the deviation from the setpoint.
•
Response of the dosing pump with increasing
deviation from the setpoint:
– The frequency of dosing strokes increases.
– If the deviation is large, the pump runs
continuously with maximum frequency of
dosing strokes.
Fig. 70
Continuous controller
Parameter settings
TM0
4
1
1
95
16
13
Off
On
Off
On
Off
On
SP 1
Chlorine
concentration
Deviation from
setpoint
Switching status of pump
(individual dosing stokes).
Current signal
20 mA
0 (4) mA
SP 1
Required chlorine concentration, e.g. 38 %.
Pulse frequency for SP 1
0
SP 2
-
*)
Pulse frequency for SP 2
-
X
p
e.g. 100 %
• Higher setting results in smaller control steps.
• Lower setting results in larger control steps.
T
n
e.g. 300 sec
• Higher setting results in slower control.
• Lower setting results in faster control.
T
v
0
Hysteresis
-
Interpulse period
-
Actuating time
0
Minimum pulse width
1 sec - so that the relays which are not required are not activated
unnecessarily.
Required code functions
1
Other code functions
As required
*)
"-": without function (no setting required)
