CANDY SWITCH

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- Accurately adjust the timing of electrical orelectronic circuits-even while running.

a CANDY

~ CONTROLS

- Dwell length and the timing of the dwell are fullyadjustable from 0-360 degrees.

- Eliminate costly down time associated with trialand error machine start-ups and changeovers.

DESCRIPTION;:; ;:; - -

The Candy Switch series is a fullline of adjustable-while-runningearn switches. These electro-mechanical and solid-stateswitches are used to adjust the"on" and "off" points (or dwelltime) of electrical or electroniccircuits at any point during amachine cycle. These variabledwell devices are commonly usedto control glue guns, solenoids,air and hydraulic cylinders, motors,relays, clutch-brakes and manyother industrial devices.Dwell control is just one functionof this earn-switch mechanism. Itis equally important to establishthe "trip-on point" or timingwithin the machine cycle. TheCandy Switch series allows amachine operator to advance orretard this timing to ensure thatthe dwell activates at the rightpoint. Like the dwell control, thetiming of the Candy Switch maybe adjusted while the machineis running.

Since it is possible to alter bothdwell and timing, the Candyswitch becomes a unique toolfor the machine designer andoperator. The designer.no,iongerhas to calculate the rise and dwellfor cams which are exp~nsive to

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fabricate and modify. The machineoperator no longer has to settlefor "good enough" timing. Withadjustable-while-running control,optimal machine performancebecomes a reality.

PRINCIPLE OFThe Candy Switch series iscomprised of five majorcomponents: an input shaft,a rotating cam, a switchingmechanism, a dwell controlassembly and a timing controlassembly. The only componentswhich change depending onthe model of Candy Switch(electro-mechanical or solid-state)are the cam and the switchingmechanism.

To actuate the switch, the input shaftmust be coupled, in some manner,to a rotating member of the parentmachine. The Candy Switch is a1:1 unit, meaning that one fullrevolution of the input shaftrepresents one full cycle ofthedwell and timing set points. Ifone revolution of the input shaftdoes not match the machine cycle,a ratio must be added betweenthe parent machine and the CandySwitch, bringing these relationshipsback to a 1:1 ratio.

Rotating the input shaft causesthe cam to rotate via a parallel-shafthelical gear arrangement. Inelectro-mechanical Candy Switches,the cam has a physical, uniformlyincreasing rise which rotates overa snap action type switch or airvalve. When the nylon roller of theswitch hits the rise, the circuit"trips on" until the cam rotatesand the nylon roller falls off therise, thus turning the circuit "off".

Solid-state Candy Switches employa solid cam wrapped with a two-tonereflective material. The solid-statecam rotates above a photo sensorwhich is part of the solid-stateswitching mechanism.

The switching mechanism activatesboth the dwell and the timing byopening or closing a circuit basedon the cam location. This

DWELL

To provide an infinitely adjustable dwell or "on-time" period, acam of uniformly increasing rise is employed to activate the switch.Shifting the cam on its hex drive shaft alters the percentage of risearea in contact with the switch roller. This design allows dwell timeto be varied from 0-360° even while running.

TIMING

To provide infinite timing adjustment of the switch "trip-on" point,a pair of helical gears are arranged so that when the shorter gearis shifted on its hex shaft, a rotary motion is imparted which causesa change in phase relationship. Full travel allows over 3600 of phasetiming, even while running.

OPERATION

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mechanism also serves as theterminal block for incomingand outgoing signals or voltages.Electro-mechanical switchestypically incorporate a snap actiontype micro switch or a two or threeway air valve. Solid-state switchingmechanisms are typically photosensor based boards which pickup a reflective pattern off aprinted cam.

The unique internal design of theCandy Switch permits on-the-flycontrol of both circuit dwell andtiming. The dwell control assemblyincreases or decreases the dwell bymoving the cam back and forth overthe switching mechanism. Circuittiming is achieved by rotating thecam on its axis over the switchingmechanism. Both adjustments areactuated by the respective controlknobs on the front face of theCandy Switch.

Most models provide a full 3600range for both timing and dwell.The values for these setpoints maybe monitored from the referencescale on top of the Candy Switch.

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ELECTRO-MECHANICAL CANDY SWITCH MODELS

MODELS

There are two basic types of electro-mechanical CandySwitches which can be determined by the switchingmechanism. The first type employs a snap action typeswitch to open and close the circuit. The secondtype uses a two or three-way air valve as theswitching mechanism.

The standard cam for all electro-mechanicalmodels is the CS-12. The CS-12 camprovides a full 0-360' range for bothdwell and timing"

..MODEL AGeneral Purpose SwitchA 20 amp, single pole, double throw, snapaction switch. Speed to 500 cpm. Switchmechanical life- 10 million cycles.

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ELECTRO-

MECHANICAL CAMS

CS-12

MODEL B ~~~p~:~~~;.~~AY DOWN t UP t

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.suitable for air, vacuum and some 6'8CFM@100PS1fluid applications. Barbed fittings for1/8" plastic tubing. Specify: 2-wayor 3-way valve. . 'N.

AIR FLOW I Standard cam for clockwiserotation. The CS-12 provides a0-360' range for both dwelland timing.

MODEL CHeavy Duty, Double Break SwitchA 20 amp double-break, butterflyswitching mechanism. Testedto over 20 million cyclesmechanical life. 1 HP @ 125 VAG.2 HP@ 250 VAG.

MODEL DDual Circuit Control SwitchA 10 amp double-break switch formultiple circuit control. 10 millioncycle mechanical life. 1/2 HP @125 VAG. 3/4 HP @ 250 VAG.

ELECTRICAL RATING" S.P.O.T.-D.B

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MODEL KHall Effect, Solid-State Cam Operated SwitchAn integrated circuit produces a digitaloutput, with no contacts (the output isbounce freel. 100 million cycle life.Specify: Model K5 (5VDC) or Model K1616 to 16 VDC). Current sinking circuit.

REGULATOR, SHOWN BY DASHEO LNES

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CS-12C

Optional cam for counter-clockwise rotation. The CS-12Cprovides a 0-360' range forboth dwell and timing.

TECHNICALCONSTRUCTION:The Candy Switch housingis a gasketed aluminum castproviding a NEMA-12 dusttight,drip proof rating. The inputshaft is steel with a black oxidefinish and is supported byself-lubricating bushings. Thereference scale on top of eachunit is available in glass orLexan plastic. Each CandySwitch model has (2) 1/2"NPT outlets to accommodatecircuit connection.

INPUT DIRECTION:It is important to determine thedirection of input as all modelsare available with clockwiseand counterclockwise cams.Candy Switches may operatesatisfactorily if run in the wrongdirection, however, the valuesfor the timing shown in thereference scale will be reversed.

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Schematic represents clockwise rotation

DWELL AND TIMING:When setting up and adjusting theCandy Switch, it should benoted that the dwell and timingare independent adjustments.A change in the timing doesnot affect the dwell. However,a change in the dwell mayaffect the timing, depending onwhether the dwell adjustmentis made on the leading edgeor trailing edge of the cam.

DATAREFERENCE SCALE:Each Candy Switch model hasa reference scale located on top

of the switch. This scaledefines relative valuesfor both dwell andtiming. Operators mayuse this scale to definelimits of adjustment orto return to a previouslyestablished set ofvalues. Standard modelsare shipped with glassscales, however, Lexan

plastic scales are available whenglass is not suitable.

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REPEATABILITY:The Candy Switch series istypically accurate to within1/2 to 1% with slight variationsdepending on the model andoperating speeds.

SPEED:All Candy Switch models willoperate as specified up to 500RPM. The input speed is directlyrelated to the life of the switch,each model has a cycle ratinglisted in the following sections.Please consult the factory if anapplication requires greateroperating speeds.

BANKING:Any number of Candy Switchesmay be banked together formultiple circuit control. Differentmodels may be mixed in the bankdepending on applicationrequirements. Four (4) 1/4"-20threaded rods are required as tierods through the bank. The CS-30banking gears (one per switch)may be used to gear the switchestogether. In this arrangement,Candy recommends that everyother switch be ordered to runin the opposite direction as theone before it.

An alternative to this bankingarrangement employs the CS-56Idler Gear Unit between switches.This serves to separate the CandySwitches by 3/8" allowing fora third gear in the train causingeach input shaft to rotate in thesame direction. See accessorynotes for more details.

MOUNTING!

I NST ALLA TIONThe Candy Switch may bemounted in any position andmay be driven in either theclockwise or counterclockwisedirection. Most designers useone of four methods to tie theCandy Switch input shaft tothe parent machine's lineshaft or rotating member:Direct coupling, chain drive,belt drive or gear drive. It isimportant to note that themachine cycle must have a1:1 relationship with the inputshaft of the Candy Switch.

Various accessories may beused when installing a CandySwitch. The CS-35, mountingbracket may be used for astandard foot mountarrangement.The Candy Switchmay also be mounted to theside frame of the machine usingthe (4) 1/4" mounting holeslocated in each corner of thehousing. The CS-30 BankingGears and the CS-56 IdlerGear Unit may be used whenthe Candy Switch is appliedin a bank.

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SWITCH/ OPERATING SWITCHED DWELLMODEL

BOARDCAM SCALE

ROTATION VOLTAGE VOLTAGETIME SPECIFY

A A CS.12 S CW 120VAC/DC N.D.AlC A CS-12C R CCW 120VAC/DC N.D.B B CS-12 S CW Pneumatic N.D. 2 or 3 way valvec C CS-12 S CW 120VAC/DC N.D.K K CS-12 S CW 5VDC or 6-16 VDC N.D. K5 or K16N N N S CW 12VDC 12VDC N.D.F F F S CW 12VDC 12VDC N.C.G N G 0-10 either 12VDC 12VDC N/AP - P S CW 10-30VDC 55mA@12V N.D. NPN or PNP

AT/12D AT N S CW 12VDC 5-400VAC N.D.AT/24D AT N S CW 24VDC 5-400VAG N.D.AT/90D AT N S CW 90VDC 5-400VAG N.D.

AT/120A AT N S CW 120VAC 5-400VAG N.D.OT/120 AT N S CW 12VDC 90 VDC N.D.OT1240 AT N S CW 24VDC 90 VDC N.D.OT1900 AT N S CW 90VDC 90 VDC N.D.

OT/120A AT N S CW 120 VAG 90 VDC N.D.

Please note that not all models are listed. Please contact the factory fol mOle Infolmatlon.Scale: S=Standard. R=Reverse.Dimensions and specifications are subject to change without notice.

ORDERINGWhen ordering a Candy Switch,it is important to:1. Decide whether an electro-

mechanical or solid-stateversion is best suited forthe application.

2. Choose the appropriateCandy Switch model basedon desired dwell time,direction of rotation,operating and switchingvoltages. The followingspecification chart mayassist you in choosing themost appropriate modelfor your application.Please note that all thespecifications in this chartare based on the standardcam for each unit.

DIMENSIONS ACCESSORIES

CS-30Banking Gear

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CS-56Idler Gear Unit

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Candy Mfg. Co., Inc.5633 W. Howard St., Niles, IL 60714Phone: (847) 588-2639Fax: (847) 588-0055email: Candymfgco@aol.comwww.candycontrols.com

@1998CandyControls. Printed In USA.

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MODELS

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Model N

For applications that require higher switching speedsand greater accuracy, Candy offers a complete line ofsolid-state switches. This line employs a boardmounted photo scanner which reads a reflectivepattern from a printed cam.

The N cam is the standard cam for mostsolid-state models. Alternative cams areavailable with different operatingcharacteristics as described to thelower right.

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MODEL AT/DTConditioned,HighCurrent SignalsThe AT/DT series is a general purpose AC or DCsolid-state switch. The AT prefix refers to an ACswitching voltage (10 amp max. current) and usesan optically isolated triac controlled switchingmechanism. This triac is a zero crossing device.The DT prefix, refers to applications involving a DCswitching voltage. The DT switch uses a transistorcontrolled switching mechanism (4 amp max.current). The standard cam for the AT/DT series isthe N cam.

MODEL NConditioned, Low Current SignalsThe model N uses a photo sensor consisting of a light emitting diode anda phototransistor. The N board contains an amplifier circuit allowing fordirect interface with pwgrammable controllers or other electronic devices. The Model Nprovides both an active high and an active low output, providing complete flexibility inmeeting interface requirements. The active low output (WLA) features an operl collectoroutput allowing a'n external pull-up resistor to a voltage between 0 and + 25V. Thestandard Model N is supplied with an N cam. Please specify 12V or 5V model whenordering. Typical Custome"ntertace, 12-Volt Model Model N,S-Volt Model

Supply current(excludingoutput loading):12- Volt Model-25 mA, 5-VoltModel-18mA.

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Suggested Circuit for TTL output, as shown, can drive 7 standard TTL inputs.

MODEL FUnconditioned SignalsThe Model F is primarily for voltage dependent circuits. The F boardcontains only a terminal strip, a 1k limiting resistor and the photo scanner.Additional circuitry must be provided by the user to suit specific applications.The standard cam for this model is the F cam.

The biockdiogram isa suggestion for use ofthis scanner. in mostcoses a forwardcurrento! 10 MAwiliprovide sufficientradiation from theemlffer to generatethe on signal from thesensor.

The electrical ratingfor this device is:

Sensor

ON stateIcMln~ 100uA

@lf~40mA@Vce~5V

IfContlnuous~40mAMaxVf@40mA=1.6VMax

OFFstateCollector-Emitter Breakdown:

50VMaxLeakage: 25 nA@ Vce~ 30V

ReverseVoltage~2VMaxEmitter

ASchmifftrlggercircultls necessary to provide hysteresis between the light and darksurfaceoftheearn. This eilminates any possible oscillations In a solid state output.

MODEL PProximity SensorThe model P is a self contained proximity sensorwhich reads a foil wrapped cam. The Model P is theonly switch in the solid-state family that is restrictedto one type of cam. The P cam offers a 0-3600 rangeof adjustability for both dwell and timing. SpecifyNPN or PNP.

Electrical Characteristics:Suppiy voltage: 12-24 VDCMax continuous load: 200 mAMax current consumption(excluding load): 10mA @ 12V

20mA @ 24V

RL min: @12V=68 ohms@ 24V=130 ohms

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PHOTOREFLECTIVESCANNER

SOLID STATE CAMS

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N CAM

0 to 360° Dwell & liming CamRotation: ClockwiseDwell: Normally open

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NC CAM

0 to 3600 Dwell & liming CamRotation: CounterclockwiseDwell: Normallyopen

F CAM ~0 to 360° Dwell & liming CamRotation: ClockwiseDwell: Normally closed

FC CAM

, 0 to 360° Dwell & liming CamRotation: CounterclockwiseDwell: Normally closed

H CAM.,

H Cam: 0° to 30° Dwell CamRotation: Clockwise or counter-clockwiseDwell: 0-30°liming: Adjustable from 0-360°

GCAM

Rotation: Clockwise or counter-clockwisePulses: 0-10 equally spaced pulseswith a pulse duration ofapproximately 22°