CEMB USA C211 (C) - Manual (Page 18)

I 0147 - 18 I 0147 - 19 GB GB
10 - Errors
Various abnormal conditions can arise during machine operation. When detected by the microprocessor, they appear
on the monitor as:
ERRORS CAUSES CONTROLS
Err. 1 No rotation signal. 1. Verify belt tautness.
2. Verify the function of the phase pick-up board and, in particular,
the reset signal.
3. Replace the phase pick-up board.
4. Replace the computer board.
Err. 2 Speed too low during detection.
During unbalance measurement rotation, wheel speed
is less than 42 rpm.
1. Make sure that a vehicle wheel is mounted on the wheel balancer.
2. Verify belt tautness.
3. Verify the function of the phase pick-up board and, in particular,
the reset signal.
4. Replace the computer board.
Err. 3 Unbalance too high. 1. Verify wheel dimension settings.
2. Check detection unit connections.
3. Perform machine calibration.
4. Mount a wheel with more or less known unbalance (less than 100
grammes) and verify the response of the machine.
5. Replace the computer board.
Err. 4 Rotation in opposite direction.
After pressing [START], the wheel begins to rotate in
the opposite direction (anticlockwise).
1. Verify the connection of the UP/DOWN – RESET signals on the
phase pick-up board.
Err. 5 Guard open
The [START] pushbutton was pressed without first
closing the guard.
1. Reset the error by pressing pushbutton [7]=End.
2. Close the guard.
3. Verify the function of the protection uSwitch.
4. Press the [START] pushbutton.
Err. 7 /
Err. 8
NOVRAM parameter read error 1. Repeat machine calibration
2. Shut down the machine.
3. Wait for a minimum time of ~ 1 Min.
4. Re-start the machine and verify correct operation.
5. Replace the computer board.
10.1 - 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 cor-
rectly 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 found to be still out-of-balance when refitted on the vehicle, this
could be due to the unbalance of the car 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, see our models L36,
L38/2).