AUMA SAR 07.1 - SAR 30.1 - Setting 3-;4-wire System 4-20 mA

17.2 Setting 3-/4- wire system 4 – 20 mA
.
Connect voltage to electronic position transmitter.
.
Move valve to end position CLOSED.
.
Connect ammeter for 0 – 20 mA to measuring points (figure 40).
The circuit (external load) must be connected
(obser
ve max. load R
B
), or the appropriate poles at the termi-
nals (refer to wiring diagram) must be linked, otherwise no
value can be measured.
.
Turn potentiometer (E2) clockwise to the stop.
.
Turn potentiometer (E2) slightly back.
.
Turn potentiometer “0” clockwise until output current starts to increase.
.
Turn back potentiometer “0” until a residual current of approx. 0.1 mA is
reached.
.
Move valve to end position OPEN.
.
Set potentiometer “max.” to end value 16 mA.
.
Move valve to end position CLOSED.
.
Set potentiometer “0” from 0.1 mA to initial value 4 mA.
This results in a simultaneous shift of the end value by 4 mA, so that the
range is now 4 – 20 mA.
.
Approach both end positions again and check setting. If necessary, correct
the setting.
If the maximum value cannot be reached, the selection of the
reduction g
earing must be checked.
30
Multi-turn actuators SA 07.1 – SA 30.1/SAR 07.1 – SAR 30.1
with actuator controls AUMA MATIC AM 01.1/AM 02.1 Operation instructions
Figure 40
“0” (0/4 mA)
“max.” (20 mA)
Meas. point (+)
0/4 – 20 mA
Meas. point (–)
0/4 – 20 mA
Cover plate
E2