EB 8384-5 EN
87
Code list
Code
no.
Parameter
– Readings/
values [default setting]
Description
15* Reference variable range
end (w-end)
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. 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.
16* Pressure limit
1.4, 2.4, 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 coeffi
-
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 distur-
bances, the K
P
and T
V
levels can be adapted accordingly after initial-
ization. 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.
K
P
level changes affect the set point deviation.
18* Derivative-action time T
V
(level)
1, [2], 3, 4, No, ESC
Read or change T
V
(see K
P
level)
A change of the T
V
level has no effect on the system deviation.
19* Tolerance band
0.1 to 10.0 %, [5.0 %] of
the operating range, ESC
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.
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