Samson 3730-5 Mounting And Operating Instructions page 87

Code Parameter – Readings/
no.
values [default setting]
15* Reference variable range
end (w-end)
50.0 to 100.0 % of the
span adjusted in
Code 12/13, [No], ESC
16* Pressure limit
1.4, 2.4, 3.7 bar, [No],
ESC
17* Proportional-action coeffi-
cient K (level)
P
0 to 17, [7], ESC
18* Derivative-action time T
(level)
1, [2], 3, 4, No, ESC
19* Tolerance band
0.1 to 10.0 %, [5.0 %] of
the operating range, ESC
EB 8384-5 EN
Description
If the set point w reaches up to the entered percentage at the final
value that causes the valve to open, the actuator is immediately filled
with air (with AIR TO OPEN) or completely vented (with AIR TO
CLOSE). This action always lead to the valve being completely
opened. The signal pressure can be limited in 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 end position w > 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 pressure limitation for double-acting actuators (with
fail-safe position AIR TO OPEN).
Read or change K
Note concerning changing the K
initialization, the values for KP and TV are optimally set.
If the positioner tends to overshoot impermissibly due to other distur-
bances, the K and T
P
ization. Increment T
the maximum value of 4 is reached, the K
increments.
K level changes affect the set point deviation.
P
Read or change T
V
A change of the T
Used for error monitoring.
Determination of the tolerance band in relation to the operating
range.
Associated lag time (30 s) is a reset criterion.
If a transit time is determined during initialization which is six times
longer than 30 s, the six-fold transit time is accepted as the lag time.
P
and T
P
levels can be adapted accordingly after initial-
V
level until desired behavior is reached or when
V
(see K level)
V P
level has no effect on the system deviation.
V
Code list
levels: During positioner
V
level can be decreased in
P
87