14.2 Setting 3- /4- wire system 4 – 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
(observe 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 to the stop.
.
Turn potentiometer (E2) back a little.
.
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 “0" 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 cannot be reached, the selection of the
reduction gearing must be checked.
22
Multi-turn actuators SAN 07.1 – SAN 25.1/SARN 07.1 – SARN 25.1
for valve automation in nuclear power plants
Operation instructions
Figure P-2
Cover plate
Meas.point (+)
0/4 – 20 mA
“0” (0/4 mA)
“max.” (20 mA)
E2
Meas.point (–)
0/4 mA – 20 mA
