Miller Electric XMT 456CV 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 28

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Contents OM-203 034N ProcessesDescription File MIG GmawFrom Miller to You Table of Contents Decstat6/05 DirectivesStandards Symbol Usage Arc Welding HazardsElectric Shock can kill HOT Parts can cause severe burnsFumes and Gases can be hazardous ARC Rays can burn eyes and skinWelding can cause fire or explosion Flying Metal or Dirt can injure eyesWelding Wire can cause injury Fire or Explosion hazardFalling Unit can cause injury Moving Parts can cause injuryPrincipal Safety Standards California Proposition 65 WarningsEMF Information About Implanted Medical DevicesSymboles utilisés UNE Décharge Électrique peut entraîner la mortLE Soudage peut provoquer un in cendie ou une explosion DES Pièces Chaudes peuvent provoquer des brûlures gravesLES Fumées ET LES GAZ peuvent être dangereux LE Bruit peut endommager l’ouïe LES Bouteilles peuvent exploser si elles sont endommagéesRisque D’INCENDIE OU D’EXPLO- Sion LA Chute DE L’APPAREIL peut blesserLE Soudage À L’ARC risque de provoquer des interférences Proposition californienne 65 AvertissementsLES Fils DE Soudage peuvent provoquer des blessures En ce qui concerne les implants médicaux Principales normes de sécuritéInformation EMF OM-203 034 Keep your head out of the fumes Disconnect input plug or power before working on machineManufacturer’s Warning Label Definitions 60 s Symbols And Definitions I1maxI1eff Weee LabelManufacturer’s Rating Labels Specifications Duty Cycle And OverheatingCV Modes CC Modes Dimensions And WeightVolt-Ampere Curves Connecting To Weld Terminals Selecting a LocationMovement Tipping Location350 ft 400 ft Put terminals Weld Output Terminals And Selecting Cable SizesARC Welding can cause Electromagnetic Interference Connecting Weld Output Cables Remote 14 Receptacle InformationElectrical Service Guide Hz Three PhaseVolts AC Duplex Receptacle Input VoltageConnecting Input Power Input Filter BoardAlways connect grounding conductor first L21 Tools NeededMode And Voltage Control For CV Only Models Mode ControlFront Panel Controls For CV Only Models Voltage ControlPreset Volts Blank Power SwitchMeter Functions For CV Only Models Front Panel Controls For CC/CV ModelsMeter Functions For CC/CV Models Panel Control GtawHold TIG Gtaw Blank Pulsed MIGMode Switch Settings For CC/CV Models Lift-Arc TIG Procedure For CC/CV Models Touch Seconds Do not Strike Like a MatchDo not remove case when blowing out inside of unit Blowing Out Inside Of UnitRemoving Case and Measuring Input Capacitor Voltage Voltmeter/Ammeter Help Displays Troubleshooting Reset circuit breaker CB1 see SectionOM-203 034 − Electrical Diagram 203 505-A Circuit Diagram For CC/CV Welding Power Source 204 950−B Complete Assembly 39 40 41Dia Part Description Quantity Mkgs 180 Support ServiceYour distributor also gives To locate a Distributor or Service Agency visit Miller Electric Mfg. CoFor assistance in filing or settling claims, contact Your distributor and/or equipment manufacturer’s