Samson 3730-2 - Page 129

EB 8384-2 EN 129
Appendix
Code
no.
Parameter–Readings/
values [default setting]
Description
13* w-end
25.0to[100.0%]ofthe
set point range, ESC
The upper range value of the set point range must be greater than
lower range value (w-start).
100.0%=20mA
14* Set point cutoff decrease
0.0to49.9%,[1.0%]of
the span adjusted in
Code12/13,No,ESC
Ifthesetpointwreachesuptotheenteredpercentageatthenal
value that causes the valve to close, the actuator is immediately
completelyvented(withAIRTOOPEN)orlled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.
15* Set point cutoff increase
50.0to100.0%ofthe
span adjusted in
Code12/13,[No],ESC
Ifthesetpointwreachesuptotheenteredpercentageatthenal
valuethatcausesthevalvetoopen,theactuatorisimmediatelylled
withair(withAIRTOOPEN)orcompletelyvented(withAIRTO
CLOSE). This action always lead to the valve being completely
opened.
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.
16* Pressure limit
1.4bar,2.4bar,3.7bar,
[No], ESC
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).
17*
Proportional-action
coefcient K
P
(level)
0 to 17, [7], ESC
ReadorchangeK
P
Note concerning changing the K
P
and T
V
levels: During positioner
initialization, the values for K
P
and T
V
are optimally set. If the
positioner tends to overshoot impermissibly due to other
disturbances, the K
P
and T
V
levels can be adapted accordingly after
initialization. Increment T
V
level until desired behavior is reached or
when the maximum value of 4 is reached, the K
P
level can be
decreased in increments.
NOTICE
!
K
P
level changes affect the set point deviation.