ARI Armaturen ARI-PREMIO - Manual (Page 31)

0040501000 4511 Page 31
Operating and installation instructions
Thrust actuator ARI-PREMIO
5.5.4 Potentiometers
The potentiometers are used for electrical position acknowledgement on the facility control
system or for the options - electronic position controller ES11 or electronic position indicator
RI21
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 and the electronic position indicator RI21 use
must be made solely of 1000 ohm potentiometers.
Conversion of the relevant valve-lift to the potentiometer angle of rotation is effected by
means of transmission determined in respect of each valve-lift between the toothed rack on
the trip slide and the pinion on the potentiometer shaft.
Use must only be made of the pinion specified for the valve-lift.
If the thrust actuator is supplied with the valve and built-in potentiometer, the potentiometer
is assembled and set ready for operation.
To achieve optimal electromagnetic compatibility it is recommended to use shielded cables
for connecting potentiometers or standardized active current or voltage signals.
5.5.4.1 Installing the potentiometer
If retrofitting the potentiometer, proceed as follows:
- Switch-off mains voltage and safeguard to prevent it from being switched back on again
accidentally.
- Loosen collar nut / countersunk screw on hood, carefully remove hood.
- Insert the potentiometer into the guide in the way that the pinion (pos. 50.73) of the
potentiometer meshes with the gear stick of the trip slide.
- With a valve lift up to 30 mm, hook spiral spring (pos. 50.70) into the left-hand window of
board support (pos. 50.42) above the potentiometer guide, insert into the guide between
the slide block and the potentiometer guide and hook into the cut-out below the
potentiometer.
With a valve lift between 30 mm and 50mm, hook spiral spring (pos. 50.70) into the right-
hand window (for 12 - 15kN middle window) above the potentiometer guide, insert into the
guide between the slide block and the potentiometer guide and hook into the cut-out
below the potentiometer.
With a valve lift between 50 mm and 65 mm, hook spiral spring (pos. 50.70) into the
middle window in board support (pos. 50.42) above the potentiometer guide, insert into
the guide between the slide block and the potentiometer guide and hook into the cut-out
below the potentiometer.
- Check to see whether pinion (pos. 50.73) is pressed into toothed rack by spiral spring
(pos. 50.70) and is positioned free from backlash.
- If this is not the case, remove spiral spring (pos. 50.70), readjust by bending a little, and
place back in position again.
- Screw jack strip of connecting cable (pos. 50.68) to board support (pos. 50.42) with two
self-tapping screws (pos. 50.69) (single potentiometer connectors 25-27).
- Insert additional 3-pole connector (pos. 50.74) in jack strip of connecting cable
(pos. 50.68).
- Set potentiometer (see point 5.5.4.2).
- Place hood carefully onto thrust actuator and fasten it on the actuator with collar nut /
rubber gasket and countersunk screw.