Samson 3730 Series - Shipment and on-site transport; Accepting the delivered goods; Removing the packaging from the positioner; Transporting the positioner

EB 8389-1S EN 37
On/off valve
5 On/off valve
The travel range of open/close (on/off) is
dened by the fail-safe position and the op-
erating point. As a result, the following pa-
rameters to determine the working range
and set point range are not analyzed and
cannot be changed.
− Lower travel/angle range value
− Upper travel/angle range value
− Lower travel/angle limit
− Upper limit for travel/angle
− Lower set point range value
− Upper set point range value
The discrete analysis of the reference vari-
able is performed in automatic mode.
If the set point ( ) is below 'Operating point
limit' when the automatic mode starts, the
valve (
) moves to the fail-safe position. If
the set point increases and exceeds 'Operat-
ing point limit', the valve moves to the 'Op-
erating point'. The valve moves back to the
fail-safe position (0% in the example) if the
set point then falls below 'Fail-safe action
limit'.
Operating point
Operating point limit
Fail-safe action limit
Fail-safe position
t [s]
25
50
∆t > 6 s
x [%]
w [%]
If the set point ( ) is above 'Operating
point limit' when the automatic mode
starts, the valve (
) moves to the operating
point. The valve moves back to the fail-safe
position (0% in the example) if the set point
then falls below 'Fail-safe action limit'.
Operating point
Operating point limit
Fail-safe action limit
Fail-safe position
t <6s
t [s]
25
50
x [%]
w [%]
Starting the partial stroke test (PST)
A partial stroke test is started when the set
point ( ) moves in the range between 25
and 50% of the travel range and remains
there for longer than six seconds. See
uSection 12.1.
Operating point =
Lower range value (PST)
Fail-safe action limit
Fail-safe position
Upper range value (PST)
Operating point limit
Stop PSTStart PST
>
6
s
t [s]
x [%]
w [%]
t
25
50