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Operation
Coding
Field
CURRENT INPUT
Z
function group
Select flow
monitoring of main
Z1
stream (with
controller switch-off)
Enter the delay for
controller switch-off
Z2
through current
input
Enter the delay for
controller switch-on
Z3
through current
input
Enter the switch-off
Z4
limit value for the
current input
Enter the switch-off
Z5
direction for the
current input
Select feedforward
Z6
control to PID
controller
Enter value for
feedforward control
Z7
at which gain = 1
applies
34
Setting range
(Factory settings, bold)
Off
On
0 s
0 ... 2000 s
0 s
0 ... 2000 s
50%
0 ... 100%
Low
High
Off
Lin = linear
Basic
50%
0 ... 100%
Display
Z
CUR.INPUT
Off
Z1
Cont.stop
0
s
Z2
Off Delay
s
0
Z3
On Delay
%
50
Z4
A.Thresh
Low
Z5
Stop Dir
Off
Z6
PID influ
50
%
Z7
Kinflu=1
OPM223/253
Info
Current input settings.
Flow monitoring may only be switched on
if the flowmeter is connected in the main
stream.
If Z1 = off, fields Z2 to Z5 are not
available.
Brief flow shortfalls can be suppressed
by a delay and do not result in controller
switch-off.
In the case of a controller, a delay until a
representative measured value is
received is useful if the flow fails for an
extended period.
0 ... 100% corresponds to 4 ... 20 mA at
the current input. Observe measured
value assignment to the current output of
the flowmeter.
The controller is switched off if the value
entered in Z4 is undershot or overshot.
If Z6 = off, the field Z7 is not available.
Z6 = basic: disturbance variable only
affects the basic load (alternatively
dosing in proportion to quantity, if usual
PID controller not possible, e.g. defective
sensor).
When the value is set, the controller
actuating variable is the same size when
feedforward control is switched on as
when feedforward control is switched off.
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