Miller Electric 293, 271 Maintenance &TROUBLESHOOTING, Routine Maintenance, Circuit Breaker CB1

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SECTION 5 − MAINTENANCE &TROUBLESHOOTING

5-1. Routine Maintenance

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

Ref. 802 990

5-2. Circuit Breaker CB1

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

2	drive gear or misaligned drive rolls.
2
	Allow cooling period and reset
	breaker. Close door.

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5-3. Unit Overload

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-223 194 Page 18

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Contents Processes OM-223 194E 2006−09Description From Miller to You Table of Contents Standards DirectivesDecstatMilan6/05 Electric Shock can kill Symbol UsageArc Welding Hazards Fumes and Gases can be hazardousFlying 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 Information− Definitions Electric shock can killDo not move or operate unit Where it could tipFalling unit can cause injury Cylinders can expolde ifCan kill Electrical shock from wiringWear approved safety Working on this machine− Installation SpecificationsVolt-Ampere Curves Duty Cycle And OverheatingModel Installing Gas Supply Installing Wire Spool and Adjusting Hub Tension271 273 293 333 383 Positoning Jumper Links 230/400V 3-Phase ModelsElectrical Service Guide 230 400L2 L3 Installing Drive Rolls and Wire Guide Aligning Drive Rolls and Wire GuideThreading Welding Wire and Adjusting Pressure Roll Tension Using Gun/Cable Holder Setting Gun Polarity for Wire Type OptionalControls for Migmatic 271/273 − OperationControls for Migmatic 293/333 Controls for Migmatic Run-In, Burnback Optional and Spot Weld Timer ControlsSpot Weld Timer Run-In ControlCircuit Breaker CB1 − Maintenance &TROUBLESHOOTINGRoutine Maintenance Unit OverloadReplace Z1 if necessary TroubleshootingCheck voltage switchs. Replace if necessary Nections. Check secondary voltages. Replace T1 if necessaryOM-223 194 − Electrical Diagrams Circuit Diagram for MigmaticCircuit Diagram for Migmatic 273 400 VAC Circuit Diagram for Migmatic 293 400 VAC Circuit Diagram for Migmatic 333 400 VAC Circuit Diagram for Migmatic 383 400 VAC − Parts List Wrapper Assembly, All ModelsPart Description Quantity Main Assembly for Migmatic Dia Part Description Quantity Mkgs Main Assembly for Migmatic Dia Part Description Main Assembly for Migmatic PL2 Main Assembly for Migmatic PL1 Main Assembly for Migmatic TP1 See Table Drive Roll & Wire Guide Kits Wire Drive and Gears 2 rollWire Drive and Gears 4 roll 1.0 mm Drive Roll And Wire Guide Kits 2 Roll ModelsDrive Roll And Wire Guide Kits 4 Roll Models 1.2 mmPage Page Effective January 1 Your distributor and/or equipment manufacturer’s For assistance in filing or settling claims, contactTransportation Department