Lincoln Electric R3R 375-I Routine Maintenance, Pocket Amptrol, Power Rectifier Replacement

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MAINTENANCE

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WARNING

ELECTRIC SHOCK can kill.

•Have an electrician install and ser- vice this equipment.

•Turn the input power off at the fuse box before working on equipment.

•Do not touch electrically hot parts.

ROUTINE MAINTENANCE

1.The fan motor has sealed bearings which require no service.

2.In extremely dusty locations, dirt may clog the air channels causing the welder to run hot. Blow out the machine at regular intervals.

POCKET AMPTROL

Routine cleaning should be the only maintenance required. The probe tip should be kept in condition to provide sharp edges at the ends to assure penetration of heavy oxide coatings on the work piece. A blunted tip could result in giving different welding currents for a given dial setting.

POWER RECTIFIER REPLACEMENT

Refer to the troubleshooting section “Power Rectifier Bridge Assembly Checking Procedure” if a rectifier fail- ure is suspected

NOTE: Since proper material and correct assembly procedures are critical, field disassembly of the power rectifier bridge sections can do more harm than good. Return a defective rectifier bridge section (or the entire bridge) to the factory for repairs.

IDEALARC® R3R 375-I, 500-I AND 600-I

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Contents R3R 375-I, 500-I Safety California Proposition 65 WarningsElectric Shock can kill Welding and Cutting Sparks can Cause fire or explosion Précautions DE Sûreté Sûreté Pour Soudage a L’ArcThank You Table of Contents Installation InstallationInput Power Connection Duty CycleOperation Output Current Control MACHINE- Remote Switch High Temperature Warning LightARC Force Control Dial Output Current Control DialAccessories Optional EquipmentK857 Remote Current Control K817, K817R UndercarriageMaintenance Routine MaintenancePower Rectifier Replacement Pocket AmptrolTroubleshooting HOW to USE Troubleshooting GuideRecommended Function Problems Troubleshooting Troubleshooting Problems Possible Cause Recommended R3R 375Troubleshooting Procedures Checking Snubber CircuitChecking Current Control Rheostat on Machine Power Silicon Controlled REC- Tifier Test Diagram Power Diode TestWiring Diagrams Idealarc R3R-400, 500-I, 500 & 600-I Wiring DiagramWiring Diagrams R3R 375-I, 500-I K817 or K817R Precaucion Aviso DE
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