SICE S 64E, Руководство по обслуживанию

Страница: 26 / 54

- Unscrew the fixing screws of the potentiometer support plate;
- disassemble the gears and reassemble them on the new potentiometer, tightening the screw so that they rub against the shaft, thus permitting
the subsequent adjustment;
- reassemble the new potentiometer with its relative gears on the plate and fix everything, ensuring that the teeth of the gears are aligned;
- re-hook the spring in the appropriate hole;
- reconnect the cable to the potentiometer;
- tighten the screw to block the gears onto the potentiometer shaft;
- turn the sensor completely towards the wheel resting flange of the machine, checking the electrical continuity of the potentiometer and the
correct coupling of the gears along the entire stroke.
As the travel of the potentiometer corresponds to about 250 numbers, if the potentiometer has been adjusted with a resting value of 5, the
value at the end stop will be about 255.
- calibrate the external sensor as indicated in the User Manual.
- check the widths obtained are correct, using wheels with known dimensions (or a special tool). To obtain these data with a precision to a tenth
of an inch, it is useful to first select the icon in the service environment and visualise the message “OFF” in the appropriate window. The
maximum error permitted on a wheel with a steel rim and average dimensions is +/- 0.2 inches.
Notes
Bear in mind that the rated width and diameter of the wheel (e.g. 6”x14”) refer to the resting planes of the tyre beads, that are obviously inside the rim.
The values measured are with reference to external planes and, as a result, are smaller than the nominal values due to the thickness of the rim itself. The
correction value therefore refers to an average thickness of the rim. This means that the data measured on wheels with different thicknesses may vary
slightly (2 or 3 tenths of an inch maximum) from the rated values. This is not a lack of accuracy of the measuring devices, but reflects reality.
12.5 Ultrasonic width sensor
Check the range in notches measured in the service environment as indicated in the table:
DISTANCE FROM THE
SENSOR (mm)
NOTCHES READ
60 (minimum reading
range)
5 (+/-5)
400 (maximum reading
range)
1,950 (+/-50)
Calibration template 1250 (+/-200)
If the value of the notches displayed by the machine is equal to -1/-2, check:
-
The cable connection on the ultrasonic sensor.
- The sensor cable connection on the connector to the side of the casing.
- connection on the main board (A, Fig. 8a).
- the sensor power voltage (24V DC) using a multimeter, see figure 8:
If the power supply voltage of the sensor is NOT present as described above, check:
-
the connection between the main board (B, Fig. 7) and the PEAL32F power board (20, Fig. 3).
- replace the connector cable (O, Fig.3) if necessary;
- replace the PEAL32F board or the main board.