Entering The Air Action; Entering The Direction Of Action - Samson 3725 Mounting And Operating Instructions

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.
Note
The changed air action first 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 configuration as de-
scribed in section 7.2):
EB 8394 EN
Default air action: ATO
Change the air action (enable configuration as described in sec-
tion 7.2):
1. Touch or
to confirm selected code. P2 blinks.
2. Press
3. Touch or
4. Press to confirm setting.
Changing the direction of action to increasing/decreasing:
1. Touch or
2. Press to confirm selected code. P7 blinks.
3. Touch or
4. Press to confirm setting.
until Code P2 appears.
until the required air action appears.
until Code P7 appears.
until <> appears.
Operating the positioner
53