Samson 3725 - Page 69

EB 8394 EN 69
Annex
P5 Characteristic
0 to 8
[0]
Select characteristic:
0, 1, 2 for globe valves, 0 to 8 with rotary actuators (P3 = 90°)
0 Linear
1 Equal percentage
2 Reverse equal percentage
3 SAMSON buttery valve, linear
4 SAMSON buttery valve, equal percentage
5 VETEC rotary plug valve, linear
6 VETEC rotary plug valve, equal percentage
7 Segmented ball valve, linear
8 Segmented ball valve, equal percentage
P6 Reference variable
[4 to 20 mA]
SRLO/SRHI
For split-range operation:
SRLO: low range 4 to 11.9mA
SRHI: high range 12.1 to 20mA
P7 w/x
[>>]/<>
Direction of action of the reference variable w to the travel/rota-
tional angle x (increasing/increasing or increasing/decreasing)
P8* Gain K
P
30/[50]
On initializing the positioner, the gain is set to the selected value.
If the positioner hunts, the K
p
value can be reduced.
P9 Pressure limitation
ON/[OFF]
The signal pressure can take on the same pressure as the supply air
at the maximum [OFF] or, in the case that the maximum actuator
force can damage the valve, the pressure is limited to approx.
2.3bar.
P10 End position w <
[ON]/OFF
Lower tight-closing function:
If w reaches up to 1 % towards the nal value that causes the valve
to close, the actuator is immediately completely vented (with ATO -
air to open) or lled with air (with ATC - air to close).
P11 End position w >
ON/[OFF]
Upper tight-closing function:
If w reaches up to 99% towards the nal value that causes the
valve to open, the actuator is immediately completely lled with air
(with ATO - air to open) or vented (with ATC - air to close).
P14 Info w Initialized Indicates the internally adjusted set point in the positioner (adjust-
ed set point in 0 to 100% according to the settings in P6 and P7).
Touch
to display external set point (applied set point in 0 to
100% according to the 4-20mA signal).
Not initialized Displays external set point in 0 to 100% according to the
4-20mA signal.