Miller Electric OM-229 038D Maintenance &TROUBLESHOOTING, Routine Maintenance, Unit Overload

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SECTION 5 − MAINTENANCE &TROUBLESHOOTING

5-1. Routine Maintenance

	Y	Disconnect power	. Maintain more often
			during severe conditions.
		before maintaining.

3 Months

Replace unreadable labels

Repair or replace cracked weld cable

Clean and tighten weld terminals

6 Months

Blow out or vacuum inside.

OR

Remove drive roll and carrier. Apply light coat of oil or grease to drive motor shaft.

5-2. Circuit Breaker CB1

1

1 Circuit Breaker CB1

CB1 protects the unit from over-

loading of drive motor M1. If CB1 opens, wire feeding stops.

2 Welding Gun

Check gun liner for blockage or kinks.

3 Wire Drive Assembly

Check for jammed wire, binding drive gear or misaligned drive rolls.

2

3

5-3. Unit Overload

Allow cooling period and reset breaker. Close door.

221−253−4

Thermal switches TP1 in XFMR and TP2 in SR1 protect the unit from damage due to overheating. If the thermal indica- tor illuminates, wait for unit to cool allowing fan motor to run before trying to weld. If unit is cool and no weld output continues, contact Factory Authorized Service Agent.

OM-229 038 Page 17

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Contents OM-229 038D 2007−04 ProcessesDescription From Miller to You Table of Contents Standards DirectivesMarks a special safety message Symbol UsageArc Welding Hazards Electric Shock can killWelding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or killCalifornia Proposition 65 Warnings Principal Safety Standards EMF InformationAbout Pacemakers Electric shock can kill − DefinitionsFalling unit can cause injury Weee Label − Installation SpecificationsDuty Cycle And Overheating Installing Gas Supply Volt-Ampere CurvesModel Positoning Jumper Links 230/400V 3-Phase Models Installing Wire Spool and Adjusting Hub TensionPhase Electrical Service GuideTools Needed = GND/PE Earth Ground Drive Roll Installing Drive Rolls and Wire Guide Scale Threading Welding Wire and Adjusting Pressure Roll TensionSetting Gun Polarity for Wire Type Optional Using Gun/Cable HolderBurnback and Spot Weld Timer Controls − OperationControls for Migmatic 221/253 Routine Maintenance − Maintenance &TROUBLESHOOTINGCircuit Breaker CB1 Unit OverloadTrouble Remedy TroubleshootingOM-229 038 Circuit Diagram for Migmatic − Electrical DiagramsCircuit Diagram for Migmatic 253 400 VAC Wrapper Assembly, All Models − Parts ListPart Description Quantity Main Assembly for Migmatic Dia Part Mkgs Description Quantity Main Assembly for Migmatic Dia Part Quantity Mkgs Description 230V 400V Drive Roll And Wire Guide Kits 2 Roll Models Wire Diameter Drive Roll Wire GuideFraction Page Page Effective January 1 ITW Welding Products Italy S.r.l. Via Privata Iseo, 6/E Owner’s Record