ARI Armaturen RI21 EN - Manual (Page 17)

Rev. 0040602000 1014 Page 2-17
Operating and installation instructions 
Electronic position indicator RI21
6.1 Factory setting
Upon delivery of the RI21 with a cpl. control device (valve and actuator), the potentiometer
and the RI21 are adjusted by factory to it’s valve travel. The factory setting is indicated with
a waterproof marker or a sticker on the nameplate.

If the order was given without indication of a special control signal, the default is 4-20mA.
4mA for a closed valve.
6.2 Setting of potentiometer
a) To adjust the potentiometer in the actuator, the operating instructions of the
corresponding actuator have to be observed.
b) Switch-off mains voltage and secure against unintentional reconnection.
c) Turn the potentiometer to 0 Ohm position.
- At PREMIO-actuator turn the potentiometer spindle counter-clockwise until it stops
(0 Ohm position).
- For inspection, the resistance of the potentiometer must be measured with an
ohmmeter. 
For resistance measurement disconnect the potentiometer from the RI21 position
indicator.

First measurement contact ................R
B
- grey cable...... - PREMIO terminal 26 (29) 
Second measurement contact ...........R
C
- red cable........ - PREMIO terminal 25 (28) 
With completely extended actuator spindle, it must be approx. 0 Ohm between the first
and second measuring contact.
d) Turn thrust actuator with manual handwheel into cpl. retracted position and read the
corresponding resistance value at the Ohmmeter.
- With cpl. retracted actuator stem, 750th .. 1100 Ohm must lie between the first and
second measuring contact.
e) Connect the potentiometer with the RI21 positioner again
f) Connect potentiometer acc. to Fig. 11 : Effective direction (only RI21!)
- For the effective direction INV (refer to Fig. 11), the cables RA and RC have to be
changed at terminal X16: 
- red cable to terminal RA 
- yellow cable to terminal RC
- For the effective direction NORM (refer to Fig. 11), the cables RA and RC at terminal
X16 have to be connected as following: 
- yellow cable to terminal RA 
- red cable to terminal RC
- Check and correct if necessary.