16.1 Setting for 2-wire system 4 – 20 mA and 3- /4-wire system 0 – 20 mA
.
Connect voltage for electronic position transmitter.
.
Move valve to end position CLOSED.
.
If installed, pull off indicator disc.
.
Connect ammeter for 0 – 20 mA to measuring points (figure P-2).
The circuit (external load) must be connected (max. load
R
B
), or the appropriate poles at the terminals (refer to
terminal plan) must be linked, otherwise no value can be
measured.
.
Turn potentiometer (E2) clockwise until stop is felt.
.
Turn potentiometer (E2) slightly back from the stop.
.
Turn potentiometer “0” clockwise until output current starts to increase.
.
Turn potentiometer “0” back until the following value is reached:
for 3-/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 anew and check minimum value (0.1 mA
or 4.1 mA). If necessary, correct the setting.
If the maximum value can not be reached, the selection of
the reduction gearing must be checked.
20
Multi-turn actuators SA 07.1 – SA 16.1
with actuator controls AMB 01.1/AMB 02.1 Operation instructions
Figure P-2
“0” (0/4 mA)
“max.” (20 mA)
Measuring point
(+)
0/4 – 20 mA
Measuring point
(–)
0/4 – 20 mA
Cover plate
E2
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