Lincoln Electric TIG 275 manual Input and Grounding Connections

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A-4

INSTALLATION

A-4

 

 

 

3.Be sure the torch and work cable rubber coverings are free of cuts and cracks that allow high frequen- cy leakage. Cables with high natural rubber content, such as Lincoln Stable-Arc® better resist high fre- quency leakage than neoprene and other synthetic rubber insulated cables.

4.Keep the torch in good repair and all connections tight to reduce high frequency leakage.

5.The work terminal must be connected to a ground within ten feet of the welder, using one of the fol- lowing methods:

A metal underground water pipe in direct contact with the earth for ten feet or more.

A 3/4" (19 mm) galvanized pipe or a 5/8" (16 mm) solid galvanized iron, steel or copper rod driven at least eight feet into the ground.

The ground should be securely made and the ground- ing cable should be as short as possible using cable of the same size as the work cable, or larger. Grounding to the building frame electrical conduit or a long pipe system can result in re-radiation, effectively making these members radiating antennas. (This is not rec- ommended).

6.Keep all access panels and covers securely in place.

7.All electrical conductors within 50 feet (15.2 m) of the welder should be enclosed in grounded rigid metallic conduit or equivalent shielding. Flexible helically-wrapped metallic conduit is generally not suitable.

8.When the welder is enclosed in a metal building, several good earth driven electrical grounds (as in 5 above) around the periphery of the building are rec- ommended.

INPUT and GROUNDING CONNECTIONS

WARNING

ELECTRIC SHOCK can kill.

Turn the input power OFF at the disconnect switch or fuse box before working on this equipment.

Be sure the voltage, phase, and frequency of the input power is as specified on the rating plate, located on the rear of the machine.

Fuse the input circuit with the recommended super lag fuses or delay type1 circuit breakers. Choose an input and grounding wire size according to local or national codes or use Section A-2. Using fuses or circuit break- ers smaller than recommended may result in "nui- sance" tripping from welder inrush currents even if not welding at high currents.

Unbalanced AC TIG welding draws higher input cur- rents than those for Stick, DC TIG, or Balanced AC TIG welding. The welder is designed for these higher input currents. However, where unbalanced AC TIG welding above 185 amps is planned, the higher input currents require larger input wire sizes and fuses per Section A-2:

Remove the reconnect panel cover located near the back of the left case side to reveal the reconnect panel. Welder supply line entry provision is in the case rear panel. Entry is through a 1.75 inch (44 mm) diameter hole in the case back. Appropriate supply line strain relief clamp is provided by installer. (See Figure A.1)

FIGURE A.1

CONNECT INPUT

POWER LEADS

CONNECT INPUT

GROUND LEAD

CONNECT INPUT VOLTAGE LEVEL

Failure to observe these recommended installation procedures can cause radio or TV interference prob- lems and result in unsatisfactory welding performance resulting from lost high frequency power.

All connections should be made in accordance with all local codes and national electrical codes. Installation by a qualified electrician is recom- mended.

PRECISION TIG 275

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Contents IP21S Precision TIGCalifornia Proposition 65 Warnings SafetyElectric Shock can kill Cylinder may explode if damaged Sûreté Pour Soudage a L’Arc Précautions DE SûretéSafety Safety Thank You Table of Contents Rated Input Single Phase only InstallationPrecision TIG Physical Dimensions Recommended Input Wire and Fuse SizesTemperature Ranges Additional Output CapacitySafety Precautions Input and Grounding Connections Stick Electrode Cable Connection Work Cable ConnectionOutput CABLES, Connections and Limitations Figure A.2 TIG Torch ConnectionFigure A.3 Auxiliary Power ConnectionsFigure A.4 Robotic Interface ConnectionProduct Description OperationPipe Thawing Welding SparksRecommended Processes Recommended Processes and EquipmentProcess Limitations Equipment LimitationsFigure B.1 Control Panel Controls and SettingsOperation Advanced Panel Controls Do not USE 4-STEP if Using AN Amptrol RemoteOperation Stick Welding Features Internal SET UP ControlsTIG Welding Features Figure B.3 Figure B.4 Setup Guidelines for TIG Welding with AN Amptrol TIG Weld Cycle ChartUsing the Start Pedal Foot Amptrol K870-1 Figure B.5 Recommended Electrode Amperage Ranges Precision TIG Making a TIG Weld with AN AmptrolFactory Installed Options AccessoriesField Installed Options Optional EquipmentSafety Precautions MaintenanceRoutine and Periodic Maintenance Overload ProtectionComponent Access Service ProceduresSpark GAP Adjustment UNDER-COOLER ServiceHOW to USE Troubleshooting Guide TroubleshootingOutput Problems SymptomsCourse of Action GAS Problems Meter ProblemsHI-FREQ Problems Preset & Output Control Problems TIG Welding Problems Stick Welding ProblemsTIG Problems Precision TIG 275 Wiring Diagram for Code Wiring DiagramL11660 Dimension PrintPrecision TIG Precision TIG Warnung Aviso DE