ARI Armaturen RI21 EN - Manual (Page 3)

Rev. 0040602000 1014 Page 2-3
Operating and installation instructions 
Electronic position indicator RI21
4.0 Description
4.1 Scope of application
The electronic position indicator RI21 is used for converting electrical resistances of up to
1000
 to electrical signals.
The electronic position indicator RI21 is suitable for installation in switch cabinets as well as
in the actuator ARI-Premio or in actuators ARI CS25 through CS27.

Electronic position indicators installed in an actuator serve to indicate exact positioning.
The ambient conditions have to be conform to the actual electromagnetic compatibility
directives. Additional the compatibility to this directives has to be maintained in case of
expansion or other changings of the ambient conditions.
4.2 Operating principle
The Ready Status on the electronic position indicator is indicated by a yellow LED. 
The positioning signal is selected by means of the slide switch SY. 
Matching of the resistance input and positioning signal output is effected via trimming
potentiometers.

The positioning signal outputs Y
u
and Y
i
are dependent on set resistance value of the
connected potentiometer. 
The control section is (electrically) DC-decoupled from the mains input.
ATTENTION !
For use on a three-wire system, the ground input
 may only be connected up to
the N contact of the mains input on the 24V AC version. 
The new contact is referred to as zero potential (0V)