Hofmann megaspin 300 Instruction Manual

0068 - 1
( Series A ) ( Series A )
WHEEL BALANCER WITH MICROPROCESSOR FOR CARS,
LIGHT COMMERCIAL VEHICLES AND MOTORCYCLES
N° 0068 - 1999.04
Operating instruction manual
Controlpanel
Wheel guard
Weight and
accessory tray
Adapterholderpins Balancingspindle
Automaticrimdistance
+ diameter gauge
Automaticwidth
gauge(optional)
Parking brake
pedal
Pneumaticspindle
lockingpedal
(Version P)
HofmannIndustrialGmbH
A - 5302 Henndorf
Hauptstraße 59
Tel [phone] \ Fax -22

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0068 - 3
CONTENTS page
1-GENERAL ....................................................................................................................................................................... 5
1.1-GENERALSAFETYRECOMMENDATIONS................................................................................................... 5
1.1.1 -STANDARD SAFETY DEVICES .................................................................................................... 5
1.2-FIELDOFAPPLICATION ................................................................................................................................ 5
1.3-OVERALLDIMENSIONS ................................................................................................................................ 5
1.4-SPECIFICATION.............................................................................................................................................. 6
2-HANDLINGANDHOISTING ........................................................................................................................................... 6
3- COMMISSIONING .......................................................................................................................................................... 6
3.1-ANCHORING ................................................................................................................................................... 6
3.2-ELECTRICALCONNECTION........................................................................................................................... 6
3.3-PNEUMATICCONNECTION(onlyforversionP) ............................................................................................. 7
3.3.1-EXTRASAFETYDEVICES ............................................................................................................. 7
3.4-ADAPTERMOUNTING.................................................................................................................................... 7
3.5-GUARDMOUNTINGANDADJUSTMENT(Explodeddrawing4) ..................................................................... 7
4- CONTROLSANDCOMPONENTS ................................................................................................................................ 8
4.1 - BRAKE PEDAL ............................................................................................................................................... 8
4.2-PNEUMATICLOCKINGPEDAL(VersionP) ................................................................................................... 8
4.3-DISTANCEANDDIAMETERGAUGE .............................................................................................................. 8
4.4-AUTOMATICWIDTHGAUGE(OPTIONAL) ..................................................................................................... 8
4.5- AUTOMATICWHEELPOSITIONING ............................................................................................................. 9
4.6-CONTROLPANELANDDISPLAY .................................................................................................................. 9
4.6.1-FUNCTIONSMENUCONTROL ......................................................................................................10
5-INDICATIONSANDUSEOFTHEBALANCINGMACHINE ..........................................................................................10
5.1-DOUBLEOPERATORPROGRAM ................................................................................................................10
5.2 -PRESETTINGOFWHEELDIMENSIONS.....................................................................................................10
5.2.1-AUTOMATICPRESETTING............................................................................................................10
5.2.1.1-"AUTOMATICWIDTH"OPTION...................................................................................................11
5.2.1.2ALU-MWHEEL .............................................................................................................................11
5.2.2 - MANUAL PRESETTING (Use only in special cases or for checks)...............................................12
5.3-RECALCULATIONOFTHEUNBALANCEVALUES ......................................................................................14
5.4-RESULTOFMEASUREMENT.......................................................................................................................15
5.4.1.-INDICATIONOFEXACTCORRECTIONPOSITIONINALU-M/ALU2/ALU3 ...................................15
5.4.2.-RESOLUTIONOFTHEUNBALANCE(SPLIT) ..............................................................................16
5.4.3-UNBALANCEOPTIMIZATION ........................................................................................................17
5.4.4-ALUAND STATICMODES.............................................................................................................18
5.4.5-AUTOMATICZEROINGOFSTATICUNBALANCE.........................................................................18
6- SET-UP ..........................................................................................................................................................................19
6.1-SELF-DIAGNOSTICS .....................................................................................................................................19
6.2.-SELF-CALIBRATION .....................................................................................................................................20
6.3-AUTOMATICGAUGES ..................................................................................................................................21
6.3.1-RIMDISTANCEGAUGE ................................................................................................................21
6.3.2-DIAMETERGAUGE .......................................................................................................................21
6.3.3-WIDTHGAUGE(OPTION)..............................................................................................................22
7 - ERRORS .......................................................................................................................................................................23
7.1-INCONSISTENTUNBALANCEREADINGS....................................................................................................23
8-ROUTINEMAINTENANCE .............................................................................................................................................23
8.1- TO REPLACETHE FUSES............................................................................................................................23
8.2- ADAPTER ENDPIECE FORSPINDLE P ......................................................................................................23
-EXPLODEDWHEELBALANCERDRAWINGS
-CE DECLARATION OF CONFORMITY

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1- GENERAL
1.1 - GENERAL SAFETY RECOMMENDATIONS
- The balancing machine should only be used by duly authorized and trained personnel.
-Thebalancingmachineshouldnotbeusedforpurposesotherthanthosedescribedintheinstruction
manual.
-Undernowayshouldthebalancingmachinebemodifiedexceptforthosemodificationsmadeexplicitly
by the manufacturer.
- Never remove the safety devices. Any work on the machine should only be carried out by duly
authorizedspecialistpersonnel.
- Do not use strong jets of compressed air for cleaning.
- Use alcohol to clean plastic panels or shelves (AVOID LIQUIDS CONTAINING SOLVENTS).
-Beforestartingthewheelbalancingcycle,makesurethatthewheelissecurelylockedontheadapter.
- The machine operator should not wear clothes with flapping edges. Make sure that unauthorized
personnel do not approach the balancing machine during the work cycle.
- Avoid placing counterweights or other objects in the base which could impair the correct operation
ofthe balancingmachine.
1.1.1 - STANDARD SAFETY DEVICES
- STOP push button for stopping the wheel under emergency conditions.
- The safety guard of high impact plastic is with shape and size designed to prevent risk of
counterweights from flying out in any direction except towards the floor.
- A microswitch prevents starting the machine if the guard is not lowered and stops the wheel
whenever the guard is raised.
1.2 - FIELD OF APPLICATION
The machine is designed for balancing wheels of cars, light commercial vehicles or motorcycles weighing
less than 65 kg. It can be operated within a temperature range of -10° to +45°C.
It is provided with the following functions: Double Operator; ALU-M; SPLIT; Unbalance optimization; Self
diagnostics;Self-calibration.
1.3 - OVERALL DIMENSIONS
Fig. 1
1170
1615
1935
1255
1390

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1.4 - SPECIFICATION
Weight with guard (excluding adapter) 108 kg version with standard spindle 300
120kgversion with pneumatic spindle 300P
Singlephasepowersupply 115 /230 V 50-60 Hz
Protectionclass IP 54
Max.powerconsumption 500 W
Balancingspeed approx. 180 r.p.m.
Cycle time for average wheel (14 kg) 6 seconds
Max.resolutionofthemeasurement 1 gram
Positionresolution ± 1.4°
Averagenoiselevel < 70 dB(A)
Distance rim - machine 0 - 267 mm
Rimwidthsettingrange 1.5" to 20" or 40 to 510 mm
Diametersettingrange 10 to 24" or 265 to 615 mm
Totalwheeldiameterwithinguard 1067 mm (42")
Totalwheelwidthwithinguard 500mm
Min/max.compressedairpressure 7 to 10 kg/cm 2 (approx. 0.7 to 1MPa;
approx. 7 to 10 BAR; approx. 100 to 145PSI)
2 - HANDLING AND HOISTING
Fig.2
N.B.: NEVER HOIST THE MACHINE
USING OTHER LIFTING POINTS
3 - COMMISSIONING
3.1 - ANCHORING
The machine can be operated on any flat non-resilient floor. Make sure that the machine rests solely on the
three support points provided (fig. 2).
3.2 - ELECTRICAL CONNECTION
The machine is supplied with a single phase mains cable plus earth (ground).
The supply voltage (and mains frequency) is given on the machine nameplate. It may NOT be changed.
Connection to the mains should always be made by expert personnel.
The machine should not be started up without proper earth (ground) connection.
Connection to the mains should be through a slow acting safety switch rated at 2A amp (230V) or 4 amp
(115V) .

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3.3 - PNEUMATIC CONNECTION (only for version P)
For operation of the spindle with pneumatic locking (constant thrust air springs), connect the balancing
machine to the compressed air main: relative connection fitting is located at the rear of the machine. At
least 7 kg/cm 2 (approx. 0.7 MPa; approx. 7 BAR; approx. 100 PSI) is required for correct operation of
theunlockingdevice.
3.3.1 - EXTRA SAFETY DEVICES
- Wheel always locked even when there is pressure failure during the balancing cycle.
- Rotary block wheel retainer which, in the event of accidental pressing of the pneumatic locking
pedal during the balancing cycle, avoids risk of the wheel slipping from the adapter. Always
actuate the unlocking control pedal with the machine stationary in order to avoid stress and
abnormal wear on the adapter.
3.4 - ADAPTER MOUNTING
The balancing machine is supplied complete with cone adapter for fastening wheels with central bore.
Otheroptionaladapters canbemounted:
Fig. 3 Fig. 3A
ABAB
Megaspin300 a) Back-off screw B and remove
threaded end-piece A.
b) Fit the new adapter.
Megaspin300P a) Unscrew rod B.
b) Unscrew end-piece A.
c) Fit the new adapter.
3.5 - GUARD MOUNTING AND ADJUSTMENT (Exploded drawing 4)
a) Insert the guard tube in its seat.
b) Fit the mounting bolts, then tighten them securely.
c) The position of the wheel guard when closed can be adjusted with relative screw accessible at the back
of the machine. Correct position is shown in fig. 1.
Adjust the angular position of microswitch control (item 403).

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4 - CONTROLS AND COMPONENTS
4.1 - BRAKE PEDAL
Thispedalallowstheoperator to holdthewheelwhenfittingthe
counterweights. It must not be actuated during the
measuringcycle.
4.2 - PNEUMATIC LOCKING PEDAL (Version P)
Thispedalallows releasingthedevicefastening thewheelon
the adapter. Do not actuate this pedal during the machine
cycle and/or when adapters other than the standard
cone adapter are mounted.
4.3- DISTANCE AND DIAMETER GAUGE
Thisgauge allows measurement of the distanceofthewheel from the machine andthewheeldiameter at
the point of application of the counterweight.
It also allows correct positioning of the counterweights on the inside of the rim using the specific function
(see 5.4.1) which allows reading, on the displays, the position used for the measurement (see 5.2.1.2).
4.4 - AUTOMATIC WIDTH GAUGE (OPTIONAL)
This gauge allows measuring the rim of the wheel to be balanced in the point of application of the
counterweight (see 5.2.1.1).
4.5 - AUTOMATIC WHEEL POSITIONING
At the end of the spin, the wheel is positioned according to the unbalance on the outside or else according
tothe static unbalance (when selected).
Positioning is disabled automatically for wheels less than 13" in diameter.
Accuracy is ±20 degrees for wheels weighing up to 25 kg.

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4.6 - CONTROL PANEL AND DISPLAY
Fig. 4
1-2 Digitalreadouts,AMOUNTOFUNBALANCE
on inside/ outside
3-4 Indicators,UNBALANCEPOSITIONoninside/
outside
5 Indicators, correction mode selected
6 Indicators,selectionmade
7 Push button, unbalance reading < 5 g (0.25 oz)
8 Pushbutton,operatorselection
9 Push button, selection of correction mode
10 Push button, SPLIT(resolutionof unbalance)
11 Pushbutton,FUNCTIONSMENU
12 Pushbutton,MENUselectionconfirm
13 Push button, cycle start
14 Emergencystoppushbutton
15 Pushbuttons,manualDISTANCE/
DIAMETER/WIDTHsetting
16 Homepushbutton
17 Positionrepeatpushbutton
18 Push button, selection of unit of
measurement,diameter/width
19 Pushbutton,unbalanceoptimizationcontrol
N.B.: - Only use the fingers to press the
pushbuttons.Neverusethe
counterweight pincers or other
pointedobjects.
- When the beep signal is enabled
(see section 4.6.1), pressing of any
push button is accompanied by a
"beep".
USER 2 ALU M
mm
FINE
ALU SD
inch
mm
MENU STOP
START
HOME ENTER
STOP
1/2
3
5
6
7
8
9
10
11
12
13 14
15
16
17
18
19
4

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4.6.1 - FUNCTIONS MENU CONTROL

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5 - INDICATIONS AND USE OF THE BALANCING MACHINE
5.1 - DOUBLE OPERATOR PROGRAM
Thisprogramallows memorizing the dimensions of two typesofwheels.Thustwooperatorscan work
simultaneouslyontwodifferent vehiclesusingthesamebalancingmachine.Thesystemmemorizes two
programswiththevariouspresetdimensions.
1 - Press to select operator (1 or 2). Choice is confirmed by the panel-mounted LED.
2 - Enter the dimensions (see 5.2).
3 - Press to carry out the balancing normally.
With call program 1 or 2 for subsequent balancing operations without setting the dimensions again.
5.2 - PRESETTING OF WHEEL DIMENSIONS
5.2.1-AUTOMATICPRESETTING
- Standard wheels (calibration necessary also for modes ALU 1, 2,3, 4, Static)
Fig.5 DISTANCE + DIAMETER
Move the gauge tip against the rim keeping it in position for at least 2
seconds.
N.B.: The measurement is the same in Position A or Position B.
Always use the round part of the retainer.
Indicationofgaugeinmovement
Indication of preset dimensions Fig. 5B
N.B.: When the acoustic beep is enabled
(see section 4.6.1), acquisition of
the dimensions is accompanied by
a "beep".
Return the gauge to position 0.
ThesystemmovesautomaticallyintoWIDTHposition.
POS. A
POS. B
Fig. 5A

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Fig. 6
- Preset the nominal width, which is normally
stamped on the rim, or else measure the
widthwiththecallipergauge(standard
accessory).
5.2.1.1 - "AUTOMATIC WIDTH" OPTION
-Movethegaugessimultaneouslyintomeasuringposition.
For distance + diameter gauge, see fig. 5.
Fig. 6A WIDTH gauge
During gauge movement, the symbol in movement appears on the display (see fig.5A) indicating that the
gauges are not steady.
- Hold the gauges still in position for approx. 2 sec.
- Successful memorization is given by the display as shown in fig. 5B.
N.B.: When the acoustic beep is enabled (see section 4.6.1), acquisition of the dimensions is
accompanied by a "beep".
- Return the gauges to rest position.
N.B.: - If the symbol of fig. 5B remains on the display, it means that at least one of the two measuring
gauges is not in rest position.
-The two measurements (distance + diameter and width) can be made at different moments. In this
case first make the (distance + diameter) measurement. Correct position of the gauge tips is
essential for accurate measurement. Incorrect measurement of the distance entails incorrect width
measurement. Check that the data calculated with the nominal width stamped on the rim (errors up
to 1/2" do not normally cause appreciable residues).

0068 - 13
5.2.1.2ALU-MWHEEL
(correction from the inside for two balancing planes with direct calibration):
Fig. 7
After the measurement for inside FI as shown in fig. 7, pull out the gauge further for memorizing the data
for outside FE; hold the position for at least 2 seconds.
Select pos. A or B in fig. 5 as required.
Manualpresettingispossibleusingthebuttonsasdescribedbelow.
5.2.2 - MANUAL PRESETTING (Use only in special cases or for checks)
- Standard wheel
Fig. 8
- Press until reading the symbol
- Preset the distance in cm of the wheel from the machine.
- Select by pressing
- Preset the nominal width which is normally stamped on the rim, or else
measure the width with the calliper gauge (standard accessory).
- Select by pressing
- Preset the nominal diameter marked on the tyre.
FE
FI

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- Wheel ALU-M
- Measure the dimensions according to the diagram below.
Fig. 9
PRESETTING:
Select the dimension to be preset by pressing
N.B.:When the outer diameter is not preset ( ) the system automatically calculates:
outer diameter ( ) = 0.8 x inner diameter ( ).
5.3 - RECALCULATION OF THE UNBALANCE VALUES
Press after a new measurement presetting.
Reading 1 - 2
14 mm
1
2

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5.4 - RESULT OF MEASUREMENT
Fig. 10 Insidecorrection Outside correction
After performing a balancing spin, the amounts of unbalance are shown on the displays.
Displays with LED's 3- 4 lit up indicate the correct angular wheel position to mount the counterweights (12
o'clock position). When the acoustic beep is enabled (see section 4.6.1), acquisition of the dimensions is
accompanied by a "beep".
If the unbalance is less than the threshold selected, is displayed instead of the unbalance. With
it is possible to read the values below the threshold chosen gram by gram.
5.4.1.- INDICATION OFEXACTCORRECTION POSITION INALU-M/ALU2/ALU3
In correction modes ALU-M/ALU2/ALU3 it is possible to cancel approximations in the mounting of the
counterweightsbyproceeding as follows:
1) Press push button N.B.: Correction position changes from 12 0'clock to 6 o'clock.
2) Bring the wheel into correct angular position indicated by the instrument for each side.
3) Pull out the gauge in Pos. B of fig. 5 bearing in mind that the following appears on the display:
indicating to move the gauge further to the outside
indicating to return the gauge to rest position
Fig. 11
The left display gives the indications for reaching the position used for the inside, while the right display
those for the outside.
4) Apply the weights at 6 o'clock position for each side making reference to the gauge tip position.

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5.4.2. - RESOLUTION OF THE UNBALANCE (SPLIT)
SPLIT only has meaning in the case of static unbalance or ALU-M on outside. It serves for hiding any
stick-on unbalance correction weights behind the rim spokes.
PRESETTING:
-Number of spokes (3 to 12)
- RISULTS :
- Move a spoke at random to the 12 o'clock position
- Split unbalance not in position, bring into position 1
- Correction position 1
- Bring second split unbalance in position 2
To return to normal unbalance display, perform a new spin by pressing or else push button .
N.B.: If button is pressed, the angular correction positions are at 6 o'clock (see also
5.4.1); the other functions are disabled.
15
30
15
15
30
30
15
30
-Correction position 2

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5.4.3-UNBALANCEOPTIMIZATION
- 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.
- It improves the residual eccentricity of the tyre.
A)
- Mark with chalk a reference point on the adapter and rim.
- With the aid of a tyre remover, turn the rim on the tyre by 180°.
- Refit the wheel with the reference mark coinciding between rim and
adapter.
- 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 rim on the
tyre until the positions correspond in order to obtain the optimization
on the display.
RETURN TO THE MEASUREMENT SCREEN
TYRE
POSITION
RIM
POSITION
If, before pressing button , a spin has not yet been performed, the machine asks for one to be
carried out as follows
The procedure is resumed from point A)

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5.4.4 - ALU AND STATIC MODES
FromtheMeasurement screen,pressbutton or to select the type required. The 5-LED displays
show the position where to apply the weights. If a spin has already been performed, the processor
automatically recalculates, for each change of mode, the amounts of unbalance according to the new
setting.
Fig. 13 Button →DYNAMIC →STATIC → DYNAMIC
DYNAMIC Balancing of steel or light alloy rims with application of clip-on
weights on the rim edges.
STATIC The STATIC mode is necessary for motorcycle wheels or
when it is not possible to place the counterweights on both
sides of the rim.
Button
ALU
→ ALU M →ALU 1→ALU 2→ALU 3→ALU 4→ALU M
ALU - 1 Balancing of light alloy rims with application of adhesive
weightsontherimshoulders.
ALU - 2 Balancing of light alloy rims with hidden application of the
outeradhesiveweight.Outerweightpositionis fixed.
ALU - 3 Combined application: clip-on weight inside and hidden
adhesiveweightonoutside(Mercedes).Outerweightposition
is the same as ALU-2.
ALU - 4 Combined application:adhesiveweightoutsideand clip-on
weightinside.
restingsurface
5.4.5-AUTOMATIC ZEROING OF STATICUNBALANCE
This program is designed to improve the quality of balancing without any mental effort or loss of time by the
operator.Infactwhenusingthenormalcommercially availableweights,withpitch of5inevery5 g,andwhen
applyingthetwocounterweightswhichaconventional wheelbalancerroundstothenearestvalue,therecould
bearesidual staticunbalanceofupto 4g. Thedamageof suchapproximationisemphasized bythefactthat
staticunbalanceis causeofmostofdisturbancesonthevehicle.Thisnewfunctionautomaticallyindicatesthe
optimumentityoftheweightstobeappliedbyapproximatingtheminan"intelligent"wayaccordingtotheirposition
inordertominimizeresidualstaticunbalance(theoreticalzero).Ifitisnotpossibletocompletelyzerothestatic
unbalancewiththedynamicunbalancekeptintolerance,suchfunctionsuppliesthesolutionforminimizingthe
staticunbalance.
Selection with
minimum static
residual unbalance
sx dx
23g 18g
50°
phase shift
sx dx
residual static
25g 20g
4 g
With
conventional
wheel balancer
Initial
unbalance Possible approximations
sx dx
25g 15g
3 g
residual static
sx dx
20g 20g
1 g
residual static
sx dx
20g 15g
6 g
residual static

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6 - SET UP
6.1 - SELF-DIAGNOSTICS
DISPLAYTEST
All displays, readouts and LED's should light up in sequence
- Turn the wheel in direction of rotation.
The following appears:
- Turn the wheel in reverse direction of rotation
The following appears:
- In one complete rev. of the wheel (in direction of rotation) this should
appear once:
-Testparameter
- Displays values of DISTANCE sensor
-Displays values of DIAMETER sensor
- Displays values of WIDTH sensor (optional)
END OF SELF-DIAGNOSTICS
CANCELSSELF-DIAGNOSTICSINANYPHASE
oppure
or
MENU

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6.2. - SELF-CALIBRATION
For machine self-calibration proceed as follows:
- Mount an iron wheel of "average" size on the shaft, example: 6''x14'' (±1''). It does not have to be a perfectlybalanced wheel.
-Preset the exact dimensions of the wheelmounted.
- Perform a spin under normal conditions.
- Add 100 g (3.5 oz) on the outside in any position.
- Shift the 100 g. weight from the outside to the inside keeping the same
position.
- Turn the wheel with the 100 g. weight to the 12 o’clock position.
oppure
or
CAUTION!! Presetting of incorrect dimensions would mean that the machine is not correctly calibrated,
therefore all subsequent measurements will be incorrect until a new self-calibration is
performed with the correct dimensions!
ENDOFSELF-CALIBRATION
CANCELSSELF-CALIBRATIONINANYPHASE
MENU