Samson 3730-0 - Signal Pressure Limitation; Set Point

EB 8384-0 EN 47
Mounting and start-up
5.10.5 Signal pressure limita-
tion
Set switch S5 to ON to limit the output signal
pressureto2.4barifrequiredbytheactua-
tor.
5.10.6 Set point
Set switches S7 and S8 to determine the in-
put signal, i.e. the range of the set point.
Switch
S7
OFF
S8
OFF
S7
ON
S8
OFF
S7
OFF
S8
ON
Input mA
4to11.9 12.1 to 20 4 to 20
Insplit-rangeoperation(Fig.15,below),the
control valves work with smaller set point
ranges. The controller output signal is used
to control two control valves, dividing it such
that the valves move through their entire
travel range at half the input signal range
each(e.g.rstvalvesetto4to11.9mA,
secondvalvesetto12.1to20mA).Toavoid
overlapping,adeadbandof±0.1mAmust
be taken into account.
100%
0%
4 20 mA12
4
20 mA
100%
0%
< >< <
< >< <
Open
Travel
Closed
Open
Travel
Closed
Set point
Input signal
Valve 1 Valve 2
Dead band
Fig.15: Normal or split-range operation
Once all start-up parameters are set:
Î Connectthesupplyair.Seesection5.11.
Î Connect the electrical power. See sec-
tion5.12.