Samson 3731-3 Mounting And Operating Instructions page 69

Parameter – Display, values
Code
no. [default setting]
Note: Codes with marked with an asterisk (*) must be enabled with Code 3 prior to configuration.
14* Setpoint cutoff decrease
(final position w <)
0.0 to 49.9 [1.0] %
No · ESC
15* Setpoint cutoff increase
(final position w >)
[No]
50.0 to 100.0 %
ESC
16* Pressure limit
[No]
P 1.4 · 2.4 · 3.7
ESC
17* Proportional-action
coefficient KP (step)
0 to 17 [7]
ESC
18* Rate time TV (step)
[2]
1 3 4 No
ESC
Description
If reference variable w reaches the percentage adjusted that
causes the valve to close, the actuator is immediately completely
vented (with AIR TO OPEN) or filled with air (with AIR TO
CLOSE). This action always lead to maximum tight-closing of the
valve.
Codes 14/15 have priority over Codes 8/9/10/11.
Codes 21/22 have priority over Codes 14/15.
If reference variable w reaches the percentage adjusted that
causes the valve to open, the actuator is immediately completely
filled with air (with AIR TO OPEN) or vented (with AIR TO
CLOSE). This action always lead to the valve being completely
opened.
A signal pressure limit is possible over Code 16.
Codes 14/15 have priority over Codes 8/9/10/11.
Codes 21/22 have priority over Codes 14/15.
Example: Set the cutoff to 99 % for three-way valves.
The signal pressure to the actuator can be limited in stages.
After changing a pressure limit already set, the actuator must be
vented once (e.g. by selecting the fail-safe position (SAFE) over
Code 0).
NOTICE
Do not activate the pressure limit for double-acting actuators with
fail-safe position AIR TO OPEN (AtO).
Displaying or changing the K
During initialization, the K
the positioner show a tendency for impermissibly high post-pulse
oscillation due to additional interference, the K
be adapted after initialization. For this, either the T
increased in increments until the desired response behavior is
reached or, when the maximum value of 4 is reached, the K
step can be decreased in increments.
Note: Changing the K
Changing T , see Code 17.
V
Note: Changing the T
tion.
and T steps:
P V
and T values are optimized. Should
P V
step influences the system deviation.
P
step has no effect on the system devia-
V
Code list
and T steps can
P V
step can be
V
P
69
EB 8387-3 EN