COATS 1250 Series Balancer - Manual (Page 25)

Important: Always read and follow the information box instructions. • 19
Diagnostic Procedures
After Balance Vibration Problems
If vibration is still present after balancing the wheels
and driving the vehicle on smooth pavement, remove
the wheels and recheck the balance. If a wheel is out
of balance the cause maybe:
• Wheel was not mounted/centered correctly on the
balancer.
• A weight has come off the wheel (possibly the
wrong clip style). Remove the other weights from
the wheel and rebalance.
• Foreign material inside the tire. Remove the tire
from the wheel, remove the foreign material, and
remount. Remove wheel weights and rebalance
the wheel.
• Stones or other foreign objects caught in the tire
tread or rim. Remove the objects. Check and rebal-
ance if needed.
If the balancer still indicates the wheels are balanced
to within 0.05 ounces on both inner and outer displays,
the problem is not in the balance of the wheels. Check
the following possible sources of vibration:
• Tire pressure. Bring all tires up to the recom-
mended PSI.
• Radial or lateral runout in the tire or wheel. Replace
the damaged part.
• Unbalance in wheel covers or trim rings. Remove
the wheel covers or trim rings and test drive. If the
vibration is gone, remove the shaft and use an
appropriate adapter to mount the wheel to the bal-
ancer. Balance the wheel with the wheel cover or
trim ring attached to the wheel.
• Incorrectly mounted tire and wheel. Remount cor-
rectly.
• Damaged wheel bolt holes. Replace wheel.
• Worn universal joints. Replace as required.
• Drive shaft unbalance or damaged. Balance, repair,
or replace.
• Unbalance in brake rotor(s) or drum(s).
• Suspension out of alignment. Align the vehicle and
replace any damaged or worn parts.
Troubleshooting
A COATS ® Service Technician may ask for information
to help diagnose service concerns (Please contact
COATS ® directly at 1-800-688-9240 for the Certified
Service Partner nearest you). Conveying this informa-
tion to your service technician prior to servicing can
help to expedite service to your equipment. Although
much of the diagnostic information aids your COATS ®
Service Technician, several remedies for balancer mis-
functions are available to the operator.
Error Messages - One of the following error mes-
sages, shown in the information box display, may
appear indicating a problem with the balancer.
Note: Always EXIT error message and repeat func-
tion to see if error is eliminated.
Error 1 - Spin up is too slow - Verify power supply to
balancer and motor connection E1
Error 2 - Spin up time too long - Check Wheel DIA
and power supply - press STOP - EXIT E2
Error 3 - No rotation signal - Check motor & encoder
function & wiring -press STOP - EXIT E3
Error 4 - Wheel rotation direction is reversed -
Disconnect power and correct wiring E4
Error 5 - Stop time too long - Verify power supply
and motor connection - press STOP - EXIT
E5
Error 6 - Encoder is not connected or has failed -
Disconnect power supply and repair E6
Error 9 - Wheel coast speed is too slow E9
Error 11 - User cancelled the operation E11
Error 20 - Arm Scale is out of range E20
Error 24 - Lower hood to spin E24
Error 25 - Loose hub nut. Tighten hub nut and respin
E25
Error 26 - CAL ERROR E26
Inverter Error - Inverter Fault-Please Wait....
An inverter error occurs when one of several fault
conditions is detected by the inverter; such as, low line
voltage, motor over temperature, motor overload or
motor drive over temperature. The balancer will not
respond to inputs until the fault condition is corrected.
The balancer will clear this error as soon as possible
and indicate that with the following message:
Inverter Fault Cleared. Press Any Key
Overload Protection - On units manufactured after
August 2007, the balancer’ s motor is overload pro-
tected per UL requirements. After 4 to 5 minutes the
machine automatically resets itself; activating the fan
motor. If this happens, notify your Certified Service
Partner immediately.
Important: Allow the fan to cool the motor for at least
30 minutes before using the balancer so the overload
protection is not tripped again.