14.1 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
.
.
If installed, pull off indicator disc.
.
Connect ammeter for 0 – 20 A (refer to wiring diagram).
The circuit (external load) must be connected (observe
max. load R
B
), or the appropriate poles at the terminals
(refer to wiring diagram) must be linked, otherwise no
value can be measured.
.
Turn setting spindle (A) clockwise until stop is felt.
.
Turn potentiometer (P1) clockwise until output current starts to increase.
.
Turn back potentiometer (P1) until the following value has been reached:
for 3- or 4-wire system:
approx. 0.1 mA
for 2-wire system:
approx. 4.1 mA
This ensures that the signal does not fall below the dead and live zero
point.
.
Move valve to end position OPEN.
.
Set to end value 20 mA using potentiometer (P2).
.
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 cannot be reached, the selection of the
reduction gearing must be checked.
22
Multi-turn actuators SAI 6 – SAI 100 / SARI 6 – SARI 100
for valve automation Inside Containment in nuclear power plants
Operation instructions
A
P1
P2
Figure N-2: Electronic position transmitter
