Samson 3730-1 - Determining Fail-Safe Position

EB 8384-1 EN 73
Operating the positioner
7.3 Determining the fail-safe
position
− AIR TO OPEN (ATO) applies to a valve
opening as the signal pressure increases.
− AIR TO CLOSE (ATC) 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.
AIR TO OPEN (ATO) always applies to posi-
tionerswithamountedreversingamplier
for double-acting rotary actuators (connec-
tionsaccordingtosection5.9).
Default: ATO
1. Turn untilCodeP2appears.
2. Press
, the code P2 blinks.
3. Turn
and select the required fail-
safe position (ATO or ATC).
4. Press toconrm.
7.4 Setting other parameters
Table14listsalltheparametercodesand
their default settings. If you want to change
the default setting of a parameter, proceed as
described previously.
More details concerning the parameter codes
canbefoundinsection11.3.