ET 66 - ET 66 M operator’s manual
CALIBRATION PROGRAM FOR
TRUCK WHEELS
This operation must be performed when you feel that the machine is out of tolerance
or when it calls for self-calibration by displaying the message Err CAL on the display
when it is set up for truck wheels.
- Set the machine in truck balancing mode (LED next to TRUCK is lit).
- Mount an average size and balanced truck wheel (or one with fairly limited out-of-
balance)
- Input all the wheel data accurately
- Press the
keys until the LED next to CAL lights.
- Confirm with .
- Lift the brake lever.
- Rotate the wheel to the point denoted by the position indicator and by the appear-
ance of the value “300” (or 10” if ‘ounce’ mode is selected) in the display.
- Release the brake lever.
- Attach a 300 g (or 10 oz) sample weight to the OUTSIDE of the wheel rim, positioning
at 12 o’clock exactly.
- Make a first spin and wait for the message “End Sp1” to appear before braking the
wheel.
Important: spins may take longer in the calibration program than during normal
operation.
The wait can be reduced by starting the spin gently, accelerating gradually and
interrupting as soon as the correct data acquisition speed is reached.
- Once the wheel is at standstill, remove the sample weight and rotate the wheel to
the point denoted by the position indicator and by the appearance of the value “300”
(or 10”) in the display.
- Attach the 300 g (or 10 oz) sample weight once again to the OUTSIDE of the wheel
rim, at 12 o’clock exactly.
- Make a second spin and wait for the message “End CAL” to appear before braking
the wheel.
At the end of this spin you will get a beep as a calibration OK signal; otherwise one of
the following error messages will be displayed:
- “Er3 CAL” if the calibration procedure has been performed incorrectly. In this case
repeat the procedure making sure that the standard weight is applied correctly.
- “Er4 CAL” if calibration has been performed with a wheel with excess unbalance. In
this case reduce the unbalance of the wheel and then repeat the calibration proce-
dure
- “Err 13” if calibration has been performed with the inside wall of the wheel posi-
tioned at a distance from the machine that is not sufficient to provide accurate
calibration.
In this case you must perform the calibration routine with a different wheel or using a
suitable distance ring to alter the wheel-machine distance.
The self-calibration program ends by displaying the unbalance value for the wheel
(disregarding the 300 g standard weight).
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