138
EB 8384-6S EN
Annex
Code
no.
Parameter
– Readings/
values [default setting]
Description
14* CLOSED end position (end
position w <)
0.0 to 49.9 %, [1.0 %] of the
span adjusted in
Code 12/13, No, ESC
Limit of the set point w
Actuators with ATO fail-safe action are completely vented and
actuators with ATC fail-safe action are completely filled with air
when the set point falls below the adjusted limit.
This action always lead to the 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* OPEN end position
(end
position w >)
50.0 to 100.0 % of the span
adjusted in Code 12/13,
[No], ESC
Limit of the set point w
Actuators with ATO fail-safe action are completely filled with air
and actuators with ATC fail-safe action are completely vented
when the set point falls below the adjusted limit.
This action always lead to the valve to be opened to the maximum.
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 to 7.0 bar, [No], ESC
Do not activate pressure
limitation for double-acting
actuators (with closed
position ATO).
Signal pressure to actuator can be limited.
After changing the pressure limit setting, the actuator must be
vented once (e.g. by selecting the fail-safe position).
17* Proportional-action
coefficient Kp level
0 to 17 [7], ESC
Kp level changes affect the
set point deviation. This
effect can be compensated
for by tuning the input filter
in Code 6. See
section 7.6.6.
During positioner initialization, the values for Kp and Tv are
optimally set. If the value for the KP level is below 3, the error
code 61 is activated.
If the positioner tends to overshoot impermissibly due to other
disturbances, the KP and TV levels can be adapted accordingly
after initialization. Increment TV level until desired behavior is
reached or when the maximum value of 4 is reached, the KP level
can be decreased in increments.
18* Derivative-action time Tv
level
1, [2], 3, 4, No, ESC
See Code 19
A change of the TV level has no effect on the set point deviation.
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