Samson 3725 - Entering the air action; Entering the direction of action

EB 8394 EN 53
Operating the positioner
7.4 Entering the air action
− ATO (air to open) applies to a valve opening as the signal pressure increases.
− ATC (air to close) applies to a valve closing as the signal pressure increases.
The signal pressure is the pneumatic pressure at the output of the positioner applied to the
actuator.
Default air action: ATO
Change the air action (enable conguration as described in sec-
tion7.2):
1. Touch
or until Code P2 appears.
2. Press
to conrm selected code. P2 blinks.
3. Touch
or until the required air action appears.
4. Press
to conrm setting.
The changed air action rst becomes effective after the positioner has been re-initialized.
7.5 Entering the direction of action
The direction of action (P7) is set to increasing/increasing (>>) by default, i.e. when the posi-
tioner is initialized, 0
% is displayed when the valve is closed and 100 % when the valve is
fully open. If necessary, the direction of action can be changed (enable conguration as de-
scribed in section7.2):
Changing the direction of action to increasing/decreasing:
1. Touch
or until Code P7 appears.
2. Press
to conrm selected code. P7 blinks.
3. Touch
or until <> appears.
4. Press
to conrm setting.
Note