Samson Series 3730 Mounting And Operating Instructions page 98

Code list
Code
Parameter – Readings/
no.
values [default setting]
14* CLOSED end position (end
position w <)
0.0 to 49.9 %, [1.0 %] of the
span adjusted in
Code 12/13, No, ESC
15* OPEN end position (end po-
sition w >)
50.0 to 100.0 % of the span
adjusted in Code 12/13,
[No], ESC
16* Pressure limit
1.4 to 7.0 bar, [No], ESC
Do not activate pressure lim-
itation for double-acting ac-
tuators (with closed position
ATO).
17* Proportional-action coeffi-
cient Kp level
0 to 17 [7], ESC
KP level changes affect the
set point deviation. This ef-
fect can be compensated for
by tuning the input filter in
Code 6. See section 7.6.6.
18* Derivative-action time Tv
level
1, [2], 3, 4, No, ESC
98
Description
Limit of the set point w
Actuators with fail-safe action ATO are completely vented and
actuators with fail-safe action ATC 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.
Limit of the set point w
Actuators with fail-safe action ATO are completely filled with air
and actuators with fail-safe action ATC are completely vented
when the set point exceeds 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 end position w > to 99 % for three-way valves.
Signal pressure to actuator can be limited.
After changing the pressure limit setting, the actuator must be vent-
ed once (e.g. by selecting the fail-safe position).
During positioner initialization, the values for Kp and Tv are opti-
mally 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 dis-
turbances, 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.
See Code 19
A change of the TV level has no effect on the set point deviation.
EB 8384-6 EN