Miller Electric D-74DX Troubleshooting, Disconnect power before troubleshooting, Trouble Remedy

Page 36

9-2. Troubleshooting

 

 

 

 

! Disconnect power before troubleshooting.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Trouble

Remedy

 

 

Wire feeds, shielding gas flows, but elec-

Check interconnecting cord connections. If secure, check cord for continuity and repair or replace (see

trode wire is not energized.

Sections 5-2and 5-3).

 

 

Wire feeder is on, meter(s) do not light

Check and reset circuit breaker at welding power source.

up, motor does not run, gas valve and

 

welding power source contactor do not

 

pull in.

 

 

 

Electrode wire feeding stops or feeds er-

Check gun trigger connection. See gun Owner’s Manual.

ratically during welding.

 

 

 

 

 

 

 

 

 

 

Check gun trigger. See gun Owner’s Manual.

 

 

 

 

 

 

 

 

 

Readjust hub tension and drive roll pressure (see Section 5-7).

 

 

 

 

 

 

 

 

 

Change to correct size drive roll (see Table 11-1).

 

 

 

 

 

 

 

 

 

Clean or replace dirty or worn drive roll.

 

 

 

 

 

 

 

 

 

Incorrect size or worn wire guides.

 

 

 

 

 

 

 

 

 

Replace contact tip or liner. See gun Owner’s Manual.

 

 

 

 

 

 

 

 

 

Remove weld spatter or foreign matter from around nozzle opening.

 

 

 

 

 

 

 

 

 

Have Factory Authorized Service Agency check drive motor or motor control board PC1.

 

 

Motor runs slowly.

Check for correct input voltage.

 

 

Wire does not feed until trigger is pulled,

Check for a short between welding gun trigger leads and weld cable. Repair short or replace welding gun.

but continues to feed after trigger is re-

 

leased, and trigger hold is not on.

 

 

 

Gas valve in feeder is rattling loudly

Check for a short between welding gun trigger leads and weld cable. Repair short or replace welding gun.

along with possible erratic or slow wire

 

feed speed.

 

 

 

Wire feeder power is on, displays light

Check welding gun trigger leads for continuity, and repair leads or replace gun.

up, but unit is inoperative.

 

 

 

 

 

 

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Contents OM-1500-7 204 129H ProcessesDescription File MIG GmawFrom Miller to You Table of Contents Decwire6/05 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 mortIndique des instructions spécifiques DES Pièces Chaudes peuvent provoquer des brûlures graves LES Fumées ET LES GAZ peuvent être dangereuxLE Soudage peut provoquer un in cendie ou une explosion 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 blesserProposition californienne 65 Avertissements LES Fils DE Soudage peuvent provoquer des blessuresLE Soudage À L’ARC risque de provoquer des interférences Principales normes de sécurité Information EMFEn ce qui concerne les implants médicaux OM-1500-7 Disconnect input plug or power before working on machine Drive rolls can injure fingersKeep your head out of the fumes Symbols And Definitions Some symbols are found only on CE productsRating Label For CE Products Weee Label For Products Sold Within The EUSpecifications Site SelectionRating Equipment Connection Diagrams Shielding gas pressure not toExceed 100 PSI 689 kPa Rear Panel Connections And Rotating Drive Assembly Wire Type, Size, And Feed Speed Capability Table Motor Speed Wire Type Wire Size Feed Speed CapabilityPin Plug Information Gun Recommendation TableInstalling And Threading Welding Wire Ment above.Cut wire off. Close coverSetting Internal DIP Switches DIP Switch S1 DIP Switch S4 Not For Customer UseWhen DIP switch positions are changed, Position Settings And Results For DIP Switch S1Power Source Selection Menu Power Switch Left/Right Select SwitchOperational Terms Jog/Purge Switch Wire Speed Front Panel ControlsTime sec Program Push Button Upper DisplayNon-CE Models CE ModelsSetup Push Button Lower DisplayAdjust Control Time Welding Sequence DiagramSequence Push Button Setup Push Button Auxiliary MenusSequence Push Button Upper DisplayReset To Factory Settings Power Source Selection MenuTrigger Hold Setup Wire Feed Speed UnitsDisplay Hold Software Revision LevelCode Optional Dual Schedule Switch Diagrams Sequence Parameters In a ProgramFor more information on Sequence Push Button see Section Diagnostics ErrorLED3-Related Error Indications There is a two-position DIPDiagnostics For User Defined Options Routine MaintenanceMonths Troubleshooting Disconnect power before troubleshootingTrouble Remedy PullOM-1500-7 − Electrical Diagram 204 144-C − Parts List Part Description Quantity Control Box Harness Connectors/Receptacles PLG117 165See -1 For Drive Roll & Wire Guide Kits Hardware is common Not available unless listed21 . PC51,151 201 Drive Roll And Wire Guide Kits Fraction Metric Kit Roll Wire SizeRoll Drive Roll Drive KitService Your distributor also givesSupport 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
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