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42
EB 8384-0 EN
Start-up and settings
100%
0%
4
20 mA
12
4
20 mA
100%
0%
< >
< <
< >
< <
Open
Travel
Closed
Open
Travel
Closed
Reference variable
Input signal
Valve 1
Valve 2
Dead band
Fig. 13:
Normal and split-range operation
7.8
Connecting the positioner
Î
Apply the supply air to the
pneumatic
connection (Supply 9). Make sure the cor
-
rect pressure is used as specified in sec
-
tion 5.1.2.
Î
Connect the electrical signal (ammeter at
ter11/–12
).
DANGER!
When connecting the electric signal,
the signal pressure may cause the
plug stem to move.
7.9
Zero adjustment
Note:
Before setting zero, settings using
switches S1 to S5 as well as switches
S7 and S8 must be made first. Refer
to sections 7.1 to 7.8.
Î
Set SPAN adjuster to 0.
Î
Adjust the input signal according to the
table below using an ammeter.
Î
Turn ZERO adjuster until the plug stem
just starts to move from its initial position.
Direction of
action
Reference
variable [mA]
Input signal for
zero [mA]
> >
4 to 20
4
> >
4 to 12
4
> >
12 to 20
12
< >
4 to 20
20
< >
4 to 12
12
< >
12 to 20
20
7.10
Gain
Î
Move the valve in small steps. If the valve
tends to hunt, set switch
S6
to
ON
to re-
duce the gain of the control loop.
7.11
Adapting the travel
In case the rated travel of the control valve
does not correspond with the selected travel
according to the table in section 7.4:
Î
Adjust the upper range value of the input
signal (e.g. 4, 12 or 20 mA) using the
ammeter.
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