AUMA Electric multi-turn actuators SA 07.1 - 48.1_SAR 07.1 - 30.1 NORM - Manual (Page 21)

14.1 Setting for 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 .
.
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 connections at the terminals (refer to
terminal plan) must be jumpered, otherwise no value can be
measured.
.
Turn potentiometer (E2) clockwise to the stop.
.
Turn potentiometer (E2) back a little.
.
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.
21
Multi-turn actuators SA 07.1 – SA 48.1 / SAR 07.1 – SAR 30.1
Operation instructions AUMA NORM
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