10
measured refer to external planes, so they will be lower than the nominal values because of
the thickness of the rim. These differences are compensated by the sensor calibration
procedure, so that the values measured are the same as the nominal values, a consolidated
reference for the user. Obviously, compensation is done with reference to the rim thickness
used in the calibration procedure, so the data measured later on wheels of different thickness
may vary slightly (maximum 2 or 3 tenths of an inch) from the nominal values. This is not an
error in the precision of the devices; it simply reflects the real situation.
Sensor errors:
ERR10:
1.
When the machine is switched on, the contacts of the reed microswitch, which indicates
the standby position of the distance and diameter sensors, are open. Check that the sensor
is in its standby position.
2.
With the sensor at standby, check that the microswitch cable contacts are closed with a
tester.
If not, check the adjustment of the microswitch (see above, "Replacing and adjusting the
reed microswitch"). If the problem cannot be resolved, replace the microswitch.
3.
Check the connection of the cable connecting the microswitch to the circuit board.
ERR12:
1.
When the machine is switched on, the outside sensor standby position reference value is
not 5 +/-1 marks (use function 98 to check) or the outside sensor is not in the standby
position;
2.
Check that the outside sensor connector is connected to the balancing machine's
connector panel;
3.
If the outside sensor is not mounted, simply select the sensor calibration function to
cancel the error message.
REPLACING AND ADJUSTING THE PICKUPS
-
Remove the weight-holder lid and the side casing to access the machine's interior.
-
Disconnect the two pickups.
-
Remove the pickup by undoing the two M8 stud bolts (to better access the inside pickup,
you can undo the M8 locknut to remove the automatic brake lever);
-
Fit the new set of pickups, making sure that the balls fit correctly into their seats, then
tighten down the stud bolts so that the pickups are lightly friction fit.
-
The pickup marked with the letter
I
(inside) mounts on the right and that marked with
E
(outside) on the left (when facing the machine).
-
Reconnect the pick up connector.
-
Set the "1 On" mode in service program "91" to display the unbalance value at maximum
precision.
-
Fit the calibration disc to the balancing machine shaft.
-
Apply a sample weight to the outside of the rim.
-
Select service program "96" and run a spin cycle to check the values of the pickup signal
and phase.
The correct values should be as follows:
- phase difference
F
from -2.0 to +2.0
- inside pickup signal
I
from 200 to 280
- outside pickup signal
E
from 110 to 170
