Lincoln Electric IM467-B manual Maintenance, Input Power Factor Capacitor Discharge Procedure

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D-1

D-1

MAINTENANCE

SAFETY PRECAUTIONS

WARNING

•Only Qualified personnel should perform this maintenance.

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

•Do not touch electrically hot parts.

INPUT POWER FACTOR

CAPACITOR DISCHARGE

PROCEDURE

This procedure ensures that the power factor capaci- tors are discharged, for greater safety when you are working on the Square Wave TIG 355 with INPUT POWER REMOVED.

1.Remove input power to the machine.

2.With a 5/16" nut driver, remove the sheet metal screws that hold the right case side in place. Remove the right case side.

3.With a volt/ohmmeter, carefully check the voltage across the input power factor capacitors. When input power is removed, the voltage across each capacitor should be zero. (Normally, the capaci- tors discharge through the primary winding in the main transformer.)

4.If capacitor voltage is zero, you may begin working on the Square Wave TIG 355.

SQUARE WAVE TIG 355

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Contents Square Wave TIG Safety Electric Shock can kill Cylinder may explode if damaged Précautions DE Sûreté Thank You Table of Contents Section D Section CSection E P196 SeriesTechnical Specifications Square Wave TIG InstallationSelect Suitable Location Safety PrecautionsHigh Frequency Interference Protection Ground Connection Input ConnectionsInput Supply Connection Electric Shock can killFigure A.2 Input Supply Connections Reconnect ProcedureTable A.2 Recommended Input Wire and Fuse Sizes Table A.1 Recommended Input Wire and Fuse SizesVolt/Freq Nameplate AWG Copper Cond Volt/Freq AC Output AWG Copper CondTIG Torch Connection Output ConnectionsLengths up to 100 to 200 ft 200 to 250 ft 100 ft 30 m 30 to 61 m 61 to 76 mStick Electrode Cable Connection Operating Instructions Safety InstructionsDesign Features and Advantages Operational Features and ControlsGeneral Description Recommended ProcessesLimitations Welding CapabilityUpper Case Front Controls Controls and SettingsSTEP/4-STEP Switch Mode SwitchHigh Frequency Switch Upper Case Front Control PanelPeak Current Control VOLTS/AMPS SwitchAC Wave Balance Auto Balance LEDPulse Controls Spot ControlsStart Controls Crater Fill Controls Figure B.2 Status Indicator Light Sequence Square Wave TIGOperation Figure B.3 Lower Case Frontcontrols Square Wave TIG Lower Case Front ControlsOperation Hand and Foot Amptrol Operation Operation Initial START-UP Welding OperationStick Welding TIG Welding GuidelinesTable B.1 Specific Effects of Controls Illustrated in the 2-Step Mode for clarityOFF Crater Fill Switch onPulse Switch on Crater Fill Switch on Start Switch onSpot Switch OFF Spot Switch onDcen Dcep + Unbalanced Wave Balanced Wave Table B.2 Typical Current RANGES1 for Tungsten ELECTRODES2TIG Welding Sequence Operation 4-STEP Mode TIG Welding Sequence Operation 2-STEP ModeTable B.3 Recommended Settings for TIG Welding Polarity SwitchOverload Protection Auxiliary PowerALL Machines OPTIONS/ACCESSORIES AccessoriesInput Power Factor Capacitor Discharge Procedure MaintenanceRoutine and Periodic Maintenance Figure D.2 General Component Locations General Machine Trouble Troubleshooting GuideSymptom Cause and Remedy Troubleshooting Guide Stick WeldingTroubleshooting Guide TIG Welding TIG Welding Lower Panel Controls K870 Foot Amptrol or K963 Hand Amptrol AccessoriesDiagrams Dimension Print Square Wave TIG355 Equipment MANUFACTURER’S Certification Equipment Installation CertificationPage Precaucion Aviso DE