COATS 6275HS Truck Wheel Balancer - Manual (Page 12)

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5.2.5 - UNBALANCE OPTIMIZATION ►
This ■ function serves to reduce the amount of weight to be added in order to balance the wheel.
It is suitable for static unbalance exceeding 30 g./ 1.5 .oz ■
It improves the residual eccentricity of the tyre. ■
This operation is required if no unbalance has been measured previously; other-
wise go to the next step
■ Mark with chalk a reference point on the adapter and rim.
■ With the aid of a tyre remover, turn the tyre on the rim by 180°.
■ Refi t the wheel with the reference mark coinciding between rim and adapter.
■ Perform a manual spin under normal conditions
■ RH display: percentage reduction
■ LH display: actual static unbalance which can be reduced by rotation.
■ Mark the two positions of the rim and tyre, and turn the tyre on the rim
until the positions correspond in order to obtain the optimization on the display.
■ RETURN TO MEASUREMENT SCREEN.
5.2.6 ► - ALU AND STATIC MODES
From the measurement screen, press the button to select all the possible types of corrections. The (5)-LED
displays show the position where to apply the weights. If a spin has already been performed, the processor automati-
cally recalculates, for each change of mode, the amounts of unbalance according to the new calculation.
5.2.7 - AUTOMATIC MINIMIZATION OF STATIC UNBALANCE ►
This program is designed to improve the quality of
balancing without any mental effort or loss of time by
the operator. In fact by using the normal commercially
available weights, with pitch of 5 in every 5 g, and by
applying the two counterweights which a conventional
wheel balancer rounds to the nearest value, there could
be a residual static unbalance of up to 4 g. The damage
of such approximation is emphasized by the fact that
static unbalance is cause of most of disturbances on
the vehicle. This new function automatically indicates
the optimum entity of the weights to be applied by
approximating them in an “intelligent” way according
to their position in order to minimize residual static
unbalance.
Initial unbalance
phase shift
Possible approximations
residual static residual static residual static
Choice with minimum
static residual
With conventional
wheel balancer
residual static