ARI Armaturen ARI-PREMIO - Manual (Page 34)

Page 34 0040501000 4511
Operating and installation instructions
Thrust actuator ARI-PREMIO
5.5.5 Error-proof potentiometer for single-channel, error-proof position feedback
The TÜV certified potentiometer on conductive plastic basis is used for single-channel,
error-proof position feedback in connection with error-proof, electronic group monitoring
systems for the regulation of fuel -, air and exhaust gas streams.
A maximum of 2 potentiometers can be installed (=1 double potentiometer).
The potentiometers can be supplied with different resistance values (see point „4.4
Technical data“).
For the electronic position controller ES11 use must be made solely with 1000 ohm
potentiometers
The conversion of the relevant valve-lift to the potentiometer angle of rotation is effected by
the transmission between the toothed rack on the trip slide and the pinion on the
potentiometer shaft.
The pinion and the potentiometer shaft are firmly connected.
If the thrust actuator is supplied with the valve and built-in potentiometer, the potentiometer
is assembled and set ready for operation.
The potentiometer is with the options „Heating“ and “position indicator RI21“ not
combinably.
To use for the electromagnetic compatibility, shielded lines are recommended for
potentiometers and electrical unit signals.
Don`t lay signal lines parallel to the main line!
5.5.5.1 Setting the potentiometer on conductive plastic basis
To set the potentiometer, proceed as follows:
- Move thrust actuator to extended position.
- Switch-off mains voltage and safeguard to prevent it from being switched back on again
accidentally.
- For checking purposes, the resistance of the potentiometer needs to be measured using
an ohmmeter.
- Measure resistance on potentiometer 1 between terminals 25 and 26.
- Measure resistance on potentiometer 2 between terminals 28 and 29.
- Loose the potentiometer by unscrewing the 2 screws and remove it incl. pinion from the
toothed rack.
- Turn potentiometer shaft (angle of rotation mech. 360°, electr. 320° without stop) and by
means of ohmmeter bring the potentiometer in initial position (approx. 0 Ohm).
- Bring the potentiomter and the pinion back in contact with the toothed rack and fasten the
screws.
- Subsequently, the screws are to be provided again with locking lacquer.
- Run thrust actuator to upper final position and read off corresponding resistance value on
ohmmeter.
ATTENTION !
- In order to achieve as high a life span as possible with maximum accuracy,
potentiometers on conductive plastic basis are not as adjustable pre-resistors
to begin but as read-free voltage dividers!
- An additional installation of the option „Error-proof potentiometer“ is not
permitted for safety reasons.