Miller Electric OM-220 390F manual Troubleshooting, Disconnect power before troubleshooting

Page 34

8-3. Troubleshooting

	Y Disconnect power before troubleshooting
Trouble	Remedy
Wire feeds, shielding gas flows, but	Check and secure weld cable connections (see Section 5-2).
electrode wire is not energized.
Electrode wire feeding stops or feeds	Check gun trigger connection. See gun Owner’s Manual.
erratically during welding.	Check gun trigger. See gun Owner’s Manual.
	Check gun trigger. See gun Owner’s Manual.
	Readjust hub tension and drive roll pressure (see Section 5-6).
	Change to correct size drive roll (see 5-6).
	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 feeder power is on, displays light	Check welding gun trigger leads for continuity, and repair leads or replace gun.
up, but unit is inoperative.

OM-220 390 Page 30

Image 34

Contents Description OM-220 390FProcesses File Advanced Manufacturing SystemsFrom Miller to You Table of Contents Directives Decwire2/04Standards Arc Welding Hazards Symbol UsageMarks a special safety message Electric Shock can killFlying Metal can injure eyes ARC Rays can burn eyes and skinWelding can cause fire or explosion Buildup of GAS can injure or killCalifornia Proposition 65 Warnings EMF Information Principal Safety StandardsAbout Pacemakers LES Fumées ET LES GAZ peuvent être dangereux UNE Décharge Électrique peut entraîner la mortIndique un message de sécurité particulier DES Particules Volantes peuvent blesser les yeux LE Soudage peut provoquer unIncendie ou une explosion DES Pièces Chaudes peuvent provoquer des brûlures graves’EMPLOI Excessif peut SUR Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser DES Organes Mobiles peuvent provoquer des blessuresPrincipales normes de sécurité En ce qui concerne les stimulateurs cardiaques− Definitions Disconnect input plug or power before working on machineKeep your head out of the fumes Symbols And Definitions Manufacturer’s Rating Label For CE Products− Introduction − InstallationSpecifications Selecting a LocationConnection Diagram Rear Panel Connections And Rotating Drive Assembly Pin Network Receptacle Information Gun Recommendation TableInstalling And Threading Welding Wire Power Source Upper Display Lower Display Voltage Range Feeder Display At Power UpDual Schedule Switch Option Net Wait− Operation Operational TermsPower Switch See Front Panel SectionsSee Section Program Push Button Upper DisplayLower Display Amps LEDFeeder Set Up Push Button Adjust KnobProcess Set Up Push Button ProcessSetupJog/Purge switch provides the following functions Jog/Purge Push Button Adjust Knob Gun Trigger ReceptacleJog/Purge Mild Steel Reset ModePulse Accu-pulseSequence Parameters In a Program − Setting Sequence ParametersSequence Parameters − Maintenance Routine MaintenanceDiagnostics Closed error Indicates a triggerDisconnect power before troubleshooting TroubleshootingTrouble Remedy OM-220 390 − Electrical Diagram Circuit Diagram211 005-E − Parts List − Fig 21 − Fig 10-2Part Description Quantity Control Box PLG4 Drive Assembly, Wire Drive Assembly, Wire -1Item1.2 mm Metric1.4 mm Page Page Page Your distributor also gives ServiceSupport For assistance in filing or settling claims, contact To locate a Distributor or Service Agency visitMiller Electric Mfg. Co Your distributor and/or equipment manufacturer’s