En
gl
is
h (
G
B)
50
15.2.9 Three-position proportional controller
Application
•
Open-loop control of dosed chlorine proportional
to the flow.
Description
A varying flow of water is to be chlorinated by a
uniform amount. The electromagnetic flowmeter
measures the flow quantity and passes it on to the
controller.
•
When the flow of water increases:
– The servomotor moves in direction of the
increased dosing capacity.
•
When the flow of water decreases:
– The servomotor moves in direction of the
decreased dosing capacity.
Fig. 67
Three-position proportional controller
Parameter settings
TM
04 1
192
16
13
Min.
Max.
Min.
Max.
Min.
Max.
Water flow
Position of the servomotor
SP 1
0
Pulse frequency for SP 1
-
*)
SP 2
-
Pulse frequency for SP 2
-
X
p
e.g. 100 % (transmission ratio 1:1):
• > 100 % (transmission ratio 1: > 1).
• < 100 % (transmission ratio 1: < 1).
T
n
0
T
v
0
Hysteresis
e.g. 1 %
Interpulse period
e.g. 2 sec
Actuating time
0
Minimum pulse width
≥
0.3 sec
Required code functions
3, 4, 8, 9, 10, 11, 17
Other code functions
As required
*)
"-": without function (no setting required)
