Miller Electric 456 CC manual Removing Case and Measuring Input Capacitor Voltage, Tools Needed

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6-3. Removing Case and Measuring Input Capacitor Voltage

! Significant DC voltage can remain on capac- itors after unit is Off. Always check the volt- age as shown to be sure the input capacitors have discharged before working on unit.

Turn Off welding power source, and disconnect input power.

1 Outside Handle Screws

To loosen top, remove two outside handle screws from both handles and all side bolts.

2Interconnecting Board PC2

3Voltmeter

Measure the dc voltage across the screw terminals on RC3 and RC5 as shown until voltage drops to near 0 (zero) volts.

Proceed with job inside unit. Rein- stall cover when finished.

+ lead to lower right terminal, − lead to upper right terminal

Tools Needed:

5/16 in

802 260 / 801 536

OM-203 034 Page 27

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Contents File MIG Gmaw OM-203 034RProcesses DescriptionFrom Miller to You Table of Contents Page HOT Parts can cause severe burns Symbol UsageArc Welding Hazards Electric Shock can killFlying Metal or Dirt can injure eyes Fumes and Gases can be hazardousARC Rays can burn eyes and skin Welding can cause fire or explosionMoving Parts can cause injury Welding Wire can cause injuryFire or Explosion hazard Falling Unit can cause injuryAbout Implanted Medical Devices Principal Safety StandardsCalifornia Proposition 65 Warnings EMF InformationUNE Décharge Électrique peut entraîner la mort Symboles utilisésLES Fumées ET LES GAZ peuvent être dangereux DES Pièces Chaudes peuvent provoquer des brûlures gravesLE Soudage peut provoquer un in cendie ou une explosion LA Chute DE L’APPAREIL peut blesser LE Bruit peut endommager l’ouïeLES Bouteilles peuvent exploser si elles sont endommagées Risque D’INCENDIE OU D’EXPLO- SionLES Fils DE Soudage peuvent provoquer des blessures Proposition californienne 65 AvertissementsLE Soudage À L’ARC risque de provoquer des interférences Information EMF Principales normes de sécuritéEn ce qui concerne les implants médicaux OM-203 034 Manufacturer’s Warning Label Definitions Disconnect input plug or power before working on machineKeep your head out of the fumes 60 s Weee Label Symbols And DefinitionsI1max I1effDuty Cycle And Overheating SpecificationsVolt-Ampere Curves Dimensions And WeightCV Modes CC Modes Location Connecting To Weld TerminalsSelecting a Location Movement TippingARC Welding can cause Electromagnetic Interference Weld Output Terminals And Selecting Cable Sizes350 ft 400 ft Put terminals Remote 14 Receptacle Information Connecting Weld Output CablesInput Voltage Electrical Service GuideHz Three Phase Volts AC Duplex ReceptacleL21 Tools Needed Connecting Input PowerInput Filter Board Always connect grounding conductor firstVoltage Control Mode And Voltage Control For CV Only ModelsMode Control Front Panel Controls For CV Only ModelsFront Panel Controls For CC/CV Models Preset Volts BlankPower Switch Meter Functions For CV Only ModelsPulsed MIG Meter Functions For CC/CV ModelsPanel Control Gtaw Hold TIG Gtaw BlankMode Switch Settings For CC/CV Models Touch Seconds Do not Strike Like a Match Lift-Arc TIG Procedure For CC/CV ModelsBlowing Out Inside Of Unit Do not remove case when blowing out inside of unitRemoving Case and Measuring Input Capacitor Voltage Voltmeter/Ammeter Help Displays Reset circuit breaker CB1 see Section Troubleshooting− Electrical Diagram 239 524-A Circuit Diagram For CC/CV Welding Power Source 239 526-A 39 40 41 Complete AssemblyDia Part Description Quantity Mkgs 180 Material Thickness Gauge Work like a Pro Your distributor also gives ServiceSupport Your distributor and/or equipment manufacturer’s To locate a Distributor or Service Agency visitMiller Electric Mfg. Co For assistance in filing or settling claims, contact

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