7.4 Entering the opening
direction
4
AIR TO OPEN/ATO applies to a valve
opening as the signal pressure increases.
4
AIR TO CLOSE/ATC applies to a valve
closing as the signal pressure increases
The signal pressure is the pneumatic pres-
sure at the output of the positioner applied
to the actuator.
Enable configuration (refer to section 7.1).
Standard
ATO
Press or until Code
P2
appears.
Press to confirm the selected code.
P2
blinks.
Press or to select the required fail-
safe position.
Press to confirm setting.
Note: The changed opening direction first
becomes effective after the positioner has
been re-initialized.
7.5 Defining the direction of
action
The direction of action is set to increas-
ing/increasing by default.
For checking purposes:
After successfully completing initialization,
the positioner display should read 0 % when
the valve is closed and 100 % when the
valve is open.
If necessary, the direction of action can be
changed either before or after initialization.
The following correlation applies:
Valve
CLOSED OPEN
Display
0 % 100 %
ATO
ää
4 mA 20 mA
äæ
20 mA 4 mA
ATC
ää
4 mA 20 mA
äæ
20 mA 4 mA
ää Increasing/increasing
äæ Increasing/decreasing
7.6 Limiting the signal pressure
If the maximum actuator force may cause
damage to the valve, the signal pressure
must be limited.
Set Code
P9
to ON. This limits the signal
pressure to approx. 2.4 bar.
Enable configuration at the positioner before
activating the pressure limit function (refer to
section 7.1)
36 EB 8394 EN
Start-up – Settings
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