Samson 3767 - Adjusting the Optional Position Transmitter

EB 8355-2 EN 5-25
Installation
5.6 Adjusting the optional
position transmitter
Thestartingpoint(zero)andupperrange
value (span) must be set before adjusting the
positiontransmitter(seesection5.5.2).
Depending on the position of the multi-pin
connector(symbolonconnector:>>or<>),
the feedback signal can be set to either a
rangeof4to20mAor20to4mAfor0to
100%travel.
ZERO
SPAN
12 34
SPAN
ZERO
Fig.5-13: Position transmitter
Zero point
Use the switches 1 and 2 to roughly set the
zeropointandtheZEROpotentiometerfor
ne-tuning.Theadjustedvalueisalways
basedona4mAsignal.
Span
Use the switches 3 and 4 to roughly set the
span, i.e. the upper range value and the
SPANpotentiometerforne-tuning.Thead-
justedvalueisalwaysbasedona20mA
signal.
Example:
Move the valve to the open position while
observing the position transmitter signal.
If the signal does not move in the desired di-
rection, change the position of the multi-pin
connector.
Adjustthezeropoint(4mA)andspan
(20mA)forthevalvepositionsaccordingto
Table 5-4.
Table 5-4: Position transmitter
Valvemovement Observed feedback signal Direction of signal Setzero/spanto
Open
á
Closed
Signal increases á
OK
20mA ValveOPEN
4mA ValveCLOSED
Not OK
à Change connec-
tor's position
4mA ValveOPEN
20mA ValveCLOSED
Signal drops â
OK
4mA ValveOPEN
20mA ValveCLOSED
Not OK
à Change connec-
tor's position
20mA ValveOPEN
4mA ValveCLOSED