Samson 3730-2 Mounting And Operating Instructions page 73

9* Upper x-range value
20.0 to 100.0 [100.0] %
nominal range,
Specified in mm or angle °, provided
Code 4 is set
ESC
10* Lower x-limit
[OFF]
0.0 to 49.9 % of the
operating range
ESC
11* Upper x-limit
[100 %]
50.0 to 120.0 [100] % of
the operating range
or OFF
ESC
12* w-start
0.0 to 75.0 [0.0] % of the
reference variable range
ESC
13* w-end
25.0 to 100.0 [100.0] % of
the reference variable range
ESC
Upper range travel/angle of rotation in the nominal or operating
range. Value is displayed or must be entered.
The characteristic is adapted.
Example: The operating range is modified, for example, to limit
the range of a control valve which has been sized too large. For
this function, the entire resolution range of the reference variable
is converted to the new limits. 0 % on the display corresponds to
the set lower limit and 100 % to the set upper limit.
Limitation of the travel/angle of rotation downwards to the en-
tered value, the characteristic is not adapted.
The characteristic is not adapted to the reduced range. See also
example in Code 11.
Limitation of the travel/angle of rotation upwards to the entered
value, the characteristic is not adapted.
Example: In some applications, it makes sense to limit the valve
travel, e.g. if a certain minimum medium flow is required or a
maximum flow must not be reached.
The lower limit must be adjusted with Code 10, and the upper
limit with Code 11. If a tight-closing function has been set up, it
has priority over the travel limitation!
When set to OFF, the valve can be opened past the nominal
travel with a reference variable outside of the 4 to 20 mA range.
Lower range value of the applicable reference variable range
must be smaller than the final value w-end, 0 % = 4 mA
The reference variable range is the difference between w-end
and w-start, and must be Δw ≥ 25 % = 4 mA.
For an adjusted reference variable range of 0 to 100 % = 4 to
20 mA, the control valve must move through its entire operating
range from 0 to 100 % travel/angle of rotation.
In split-range operation, the valves operate with smaller refer-
ence variables. The control signal of the control unit to control
two valves is divided such, for instance, that the valves move
through their full travel/angle of rotation at only half the input
signal (first valve set to 0 to 50 % = 4 to 12 mA and second valve
set to 50 to 100 % =12 to 20 mA reference variable).
Upper range value of the applicable reference variable range,
must be greater than w-start.
100 % = 20 mA
Code list
73
EB 8384-2 EN