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.
.
Pulling off the indicator disc.
.
Connect ammeter for 0 – 20 mA to measuring points (figure P-2).
The circuit (external load) must be connected (observe
max. load R
B
), or the appropriate connections at the termi-
nals (refer to wiring diagram) must be jumpered, other-
wise no value can be measured.
.
Turn potentiometer (E2) counterclockwise until stop is felt.
.
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.
Part-turn actuators SG 05.1 – SG 12.1 / SGR 05.1 – SGR 12.1
AUMA NORM
Operation instructions
Figure P-2
“0” (0/4 mA)
“max.” (20 mA)
Meas. point (+)
0/4 – 20 mA
Meas. point (–)
0/4 – 20 mA
Cover plate
E2
