Miller Electric XR W, XR A Spot Controls Optional, Remote Voltage Control Optional, Power Switch

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5-7. Spot Controls (Optional)

3

2

4

1

1 Spot/ContinuousSwitch

Use switch to select either an un- timed continuous weld cycle or a timed spot weld cycle. Both weld cycles consist of the following steps: run-in, weld (untimed or spot time), and burnback.

2 Time Range Switch

Use switch to select spot weld time range.

3 Spot Time Control

Use control to set spot weld time. Welding wire feeds at speed se- lected on the gun Wire Speed Con- trol. Spot time starts at arc initiation.

The scale around the control is marked in seconds.

4 Burnback Time Control

Use control to adjust time (up to 0.25 seconds) that the welding wire is electrically energized after the wire stops feeding.

If welding wire sticks in the weld puddle, increase burnback time. If wire burns back into the gun contact tip, decrease burnback time.

The scale around the control is marked in fractions of a second.

5-8. Remote Voltage Control (Optional)

 

1 Voltage Control

 

Use control to adjust arc voltage at

1

the wire feeder.

The scale around the control is

 

 

marked in percent.

5-9. Power Switch

 

1 Power Switch

1

Use switch to turn unit On and Off.

 

OM-1581 Page 26

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Contents Description OM-1581137 532YProcesses File MIG GmawFrom Miller to You Table of Contents Troubleshooting Spot Controls OptionalArc 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 Principal Safety Standards EMF InformationAbout Pacemakers UNE Décharge Électrique peut entraîner la mort LES Fumées ET LES GAZ peuvent être dangereuxIndique 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 cardiaquesGun Specifications − SpecificationsWire Feeder Specifications Duty Cycle And Overheating− Installation Constant Voltage CV Weld- ing Power Source Plug Removing Top Cover Of Pistol Grip Gun Top Cover Triangular BossPush door back into original posi- tion to close Air-Cooled Gun Connections Water-Cooled Gun Connections Air-Cooled Feeder Connections RegulatorReturn Fitting On Water-Cooled Feeder ConnectionsTop View Rear Panel Supply Fitting On RegulatorReinstall right side panel Voltage Sensing Lead Connections11 VAC/Contactor Control Plug Information Receptacle on welding power Pins a & B of PLG5Or -4, install 5-pin or Source, and install plug ontoInstalling Wire Spool Threading Welding Wire Through Feeder Threading Welding Wire Through Gun Coolant GuidelinesAdjusting Wire Feed Starting Speed Front Panel Controls Of Feeder Air-Cooled Model Shown Safety Equipment− Operation Work And Voltage Sensing Cable ClampsJog Switch Voltage/Wire Speed Switch And Meter OptionalRun-In Speed Control Power Switch Spot Controls OptionalRemote Voltage Control Optional Flowmeter Optional Internal ControlsCoolant Supply For Water-Cooled Models Only Gun ControlsShielding Gas Sequence Of Gas Metal Arc Welding Gmaw − Continuous Or SpotTurn Off all power before maintaining − Maintenance & TroubleshootingRoutine Maintenance MonthsChanging Or Cleaning Gun Drive Roll Changing Feeder Drive Roll And Wire Inlet Guide Close pressure roll assembly. Close and latch door Changing Gun Contact Tip Removing Diffuser In Air And Water-Cooled Pistol-Grip GunsSplit End Turn Off welding power source and wire feederReplacing The Liner Drive Roll Collet NutReplacing Hub Assembly Close gun pressure roll assembly and reinstall gun coverAdjusting Hub Tension Water Flow Switch Optional For Water-Cooled ModelsOverload Protection Troubleshooting Wire Feeder TroubleReinstall current pick-up tab if applicable see Section Filter, and clean fittings see SectionGun Trouble − Electrical Diagrams Circuit Diagram For Wire FeederCircuit Diagram For Gun OM-1581 − Parts List 12 13 9 10 17 18 1745 46 Dia Part Description Quantity Mkgs CB1 Motor & Wire Drive -1 Item Includes ItemsPanel, Front w/Components Water-Cooled Model Illustrated Panel, Front w/Components -1 Item 38Fig Items 24Includes PLG20 136 Head Tube Assembly Of Pistol-Grip Gun − Parts List Including Consumables NumberHeavy Duty FasTiptContact Tips Extra Heavy Duty FasTiptContact TipsTapered FasTipt Contact Tips Barrel Assemblies Gas DiffusersInsulators Head Tube AssembliesService Your distributor also givesSupport 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