CEMB USA K10 (D) - Manual (Page 16)

I 0215 - 16 GB
7 - ERRORS
During machine operation, various causes of faulty operation could occur. If detected by the
microprocessor, they appear on the display as follows:
ERROR MEANING
1 No rotation signal. Could be caused by faulty position transducer, or something
preventing the wheel from turning.
2 During the measurement spins, wheel speed had dropped below 60 r.p.m. Verify
encoder function (see
SELF-DIAGNOSTICS ) and repeat the spin.
3 Unbalance too high.
4 Rotation in opposite direction.
5 Guard open before start of spin.
7 Fault in reading the machine calibration parameters. Repeat the self-calibration.
8 Fault in writing the machine calibration parameters. Repeat the self-calibration.
9 General fault in memory of the machine calibration parameters. Contact Technical
Service Department.
11 Speed too high during unbalance measurement spins.
12/13/14 Difficulty in reading the analogue signal. Verify encoder function (see SELF-
DIAGNOSTICS ). Contact Technical Service Department.
15/17 Inside/outside analogue signal too high. Contact Technical Service Department.
16/18 Inside/outside analogue signal too low. Contact technical service department.
Perform a manual wheel spin until the unbalance is displayed.
7.1 - INCONSISTENT UNBALANCE READINGS
Sometimes after balancing a wheel and removing it from the balancing machine, it is found that, upon
mounting it on the machine again, the wheel is not balanced.
This does not depend on incorrect indication of the machine, but only on faulty mounting of the wheel
on the adapter, i.e. in the two mountings the wheel has assumed a different position with respect to the
balancing machine shaft centre line. If the wheel has been mounted on the adapter with screws, it could
be possible that the screws have not been correctly tightened, i.e. crosswise one by one, or else (as often
occurs) holes have been drilled on the wheel with too wide tolerances.
Small errors, up to 10 grams (0.4 oz) are to be considered normal in wheels locked by a cone; the error is
normally greater for wheels fastened with screws or studs.
If, after balancing, the wheel is still unbalanced when refitted, this could be due to the unbalance of the
brake drum or very often due to the holes for the screws on the rim and drum sometimes drilled with too
wide tolerances. In such case a readjustment could be advisable using the balancing machine with the
wheel mounted. (For example, our L36, L38/2 models).