Samson 3730-2, Mounting And Operating Instructions

Page: 88 / 128

88 EB 8384-2 EN
Code list
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 final
value that causes the valve to close, the actuator is immediately com-
pletely 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.
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 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.
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.
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
coefficient 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 posi-
tioner 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 in-
crements.
NOTICE
!
K
P
level changes affect the set point deviation.