16.2 Setting for 3- / 4- wire system 4 – 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 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 “max.” 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 anew and check setting. If necessary, correct
the setting.
If the maximum value can not be reached, the selection of
the reduction gearing must be checked.
21
Multi-turn actuators SA 07.1 – SA 16.1
Operation instructions with actuator controls AMB 01.1/AMB 02.1
Figure P-2
Cover plate
Measuring point
(+)
0/4 – 20 mA
“0” (0/4 mA)
“max.” (20 mA)
E2
Measuring point
(–)
0/4 mA – 20 mA
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