Endress+Hauser Liquisys M CLM253 - Page 44

Commissioning Liquisys M CLM223/253
44 Endress+Hauser
Functions marked in italics are not supported by the basic device version.
Coding Field Range of
adjustment
(factory
settings in
bold)
Display Info
Z
CURRENT INPUT
function group
Z
CUR.INPUT
A0024903-EN
Current input settings
Z1 Select flow
monitoring of main
stream (with
controller switch-
off)
Off
On
Z1
Cont.stop
Off
A0024904-EN
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.
Z2 Enter the delay for
controller switch-
off through current
input
0 s
0 to 2000 s
Z2
s
Off Delay
0
A0024905-EN
Brief flow shortfalls can be
suppressed by this delay and do
not result in controller switch-
off.
Z3 Enter the delay for
controller switch-
on through current
input
0 s
0 to 2000 s
Z3
s
On Delay
0
A0024934-EN
In the case of a controller, a
delay until the reception of a
representative measured value
is recommended after a long
period without flow.
Z4 Enter the switch-off
limit value for the
current input
50 %
0 to 100 %
Z4
%
A.Thresh
50
A0024935-EN
0 to 100% corresponds to 4 to
20 mA at the current input.
Observe measured value
assignment to the current
output of the flowmeter.
Z5 Enter the switch-off
direction for the
current input
Low
High
Z5
Stop Dir
Low
A0024939-EN
The controller is switched off if
the value entered in Z4 is
undershot or overshot.
Z6 Select feedforward
control to PID
controller
Off
Lin = linear
Basic
Z6
PID influ
Off
A0024940-EN
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).
Z7 Enter value for
feedforward control
at which gain = 1
applies
50 %
0 to 100 %
Z7
%
Kinflu=1
50
A0024941-EN
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.