Samson 3730 Series Mounting And Operating Instructions page 184

Annex A (configuration instructions)
Code Parameter – Readings/
no.
values [default setting]
15* Set point cutoff increase
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
16-4
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 leads 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 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 pressure limitation for double-acting actuators (with
closed position AIR TO OPEN).
Read or change K
Note concerning changing the K
initialization, the values for K
If the positioner tends to overshoot impermissibly due to other
disturbances, the K
initialization. Increment T
when the maximum value of 4 is reached, the K
decreased in 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
and T are optimally set.
P V
and T levels can be adapted accordingly after
P V
level until desired behavior is reached or
V
(see K level)
V P
level has no effect on the system deviation.
V
levels: During positioner
V
level can be
P
EB 8384-4 EN