17.1 Setting 2-wire system 4 – 20 mA and 3-/4-wire system 0 – 20 mA
.
Connect voltage to electronic position transmitter.
.
Move valve to
end position CLOSED
.
.
Connect ammeter for 0 – 20 mA to measuring points (figure 39).
The circuit (external load) must be connected
(observe 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 potentiometer “0” back until the following value is reached:
for 3- or 4-wire system:
approx. 0.1 mA
for 2-wire system:
approx. 4.1 mA.
This ensures that the signal remains above the dead and live zero point.
.
Move valve to end position OPEN.
.
Set potentiometer “max.” to end value 20 mA.
.
Approach end position CLOSED again and check minimum value
(0.1 mA or 4.1 mA). If necessary, correct the setting.
If the maximum value cannot be reached, the selection of the
reduction gearing must be checked.
29
Multi-turn actuators SA 07.1 – SA 30.1/SAR 07.1 – SAR 30.1
Operation instructions
with actuator controls AUMA MATIC AM 01.1/AM 02.1
Figure 39
“0” (0/4 mA)
“max.” (20 mA)
Meas.point (+)
0/4 – 20 mA
Meas.point (–)
0/4 – 20 mA
Cover plate
E2