ARI Armaturen RI21 EN - Manual (Page 20)

Page 2-20 Rev. 0040602000 1014
Operating and installation instructions 
Electronic position indicator RI21
6.5 Slope span setting
ATTENTION !
- Observe the order of the settings:

1. Potentiometer (refer to 6.2) 
2. Type of control signal (refer to 6.3) 
3. Zero point (refer to 6.4) 
4. Slope span (refer to 6.5)
- In case of subsequent changes to a setting, the following settings must be
readjusted!
a) Turn the valve stem with the handwheel for the max. control signal in the desired
position, e.g. 20mA or 10V (according to the switch position SW and as shown in Fig. 11
: Effective direction). Typically this will be the opened valve.
b) Connect the instrument corresponding to the set control signal type to terminal X16 
(if it was disconnected at item 6.4). 
- Yu: voltmeter at terminal Yu and GND 
- Yi: amperemeter at terminal Yi and GND
c) Adjust the slope span screw S until the maximum desired control signal value on the
instrument is shown (after 25 rotations, the slip clutch sets). 
- Increase value: turn clockwise, 
- Decrease value: turn anti-clockwise. 
E.g.: 
- Current output ................ maximum value .........Yi = 20 mA 
- Voltage output ..................... maximum value ............Yu = 10V
d) Switch off the power supply to the RI21, and reconnect the terminal X25 or X28 to the
motor.
e) Disconnect measuring instrument
f) After the feedback signal is connected corresponding to the position of the switch SY at
terminal 16 and the switching power supply is also turned on, the position indicator RI21
is ready for operation.
7.0 Care and maintenance
The electronic position indicator RI21 requires little maintenance so that specific
maintenance tasks are not specified at set intervals.

Dirt which may build up on the outside should be cleaned from the electronic position
indicator RI21 corresponding to operating conditions.
ATTENTION !
Before cleaning electronics the supply line must be disconnected from the mains
(not live). It must be impossible to switch the power on unintentionally while the
mains are disconnected in this way.
Failure to comply may result in death, serious injury or substantial damage to
property.
The electronic position indicator RI21 must not be cleaned with watery liquids or with
solvents or detergents which are aggressive, harmful or highly flammable.
Before cleaning, the detergent should preferably be applied to a cleaning cloth. Liquids
must not penetrate into the inside of the electronic position indicator.