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OPM223/253
Constant controller
Via the current output 2, the minimum actuating variable (0 %) of the controller is output with
0/4 mA and the maximum actuating variable (100%) of the controller is output with 20 mA.
Control characteristic for direct and inverse control action
You can choose between two control characteristics in the R236 field:
• Direct control action = maximum function
• Inverse control action = minimum function
Fig. 34:
A
Direct = max. function
B
Inverse = min. function
Timer for cleaning function
This function includes a simple cleaning option. You can set the time interval after which
cleaning should start. So you can only select a constant interval sequence.
Other cleaning functions are available for selection in conjunction with the Chemoclean
function (version with four contacts, see "Chemoclean function" section).
!
Note!
Timer and Chemoclean do not work independently of one another. While one of the two
functions is active, the other cannot be started.
Abb. 35: Connection between cleaning time, pause time and Hold dwell period
A
Wiper and/or spray cleaning system
B
Hold function
0
Inactive
1
Active
A
– X
W
B
– X
W
Control characteristic of a proportional controller with direct and inverse control action
A
t
1
1
0
B
1
0
Y
100 %
X
Y
100 %
X
t
2
t
3
t
Cleaning time (0 ... 999 s)
1
t
Pause time between two cleaning intervals
2
(1 ... 7200 min)
t
Clean Hold dwell period (0 ... 999 s)
3
Operation
W
W
C07-OxM2x3xx-05-06-00-xx-006.eps
t
t
C07-OLM2x3xx-05-06-xx-007.eps
47
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