Lincoln Electric SAM650, SAM400 manual Ground Tests

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TROUBLESHOOTING

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GROUND TESTS

CAUTION

This machine is equipped with solid-state electronic components which can be damaged if subjected to a ground test or a megger test without observing special precautions as outlined here:

A.Prior to the ground test always turn the engine off and remove the two Printed Circuit boards mounted on the rear of the welder control panel. For access remove the welder roof and the metal enclosures over the PC boards. Remove one screw from the smaller board and two screws from the larger board and pull each board straight out from the connector block. There are no wires to disconnect.

B.Connect the following jumpers:

1.Welding generator frame to base.

2.Across D13 (#232 to #1)

3.Across D14 (#234 to #75).

C.Place jumpers across the following points, see wiring diagram.

1.Across the voltmeter terminals if the unit is so equipped.

2.Positive side of SCR bridge (#75) to #214 on the SCR bridge located on the rear panel of the control box.

3.Positive side of SCR bridge (#75) to #212 on the SCR bridge.

4.Across C5 on the SCR bridge.

5.Negative side of the SCR bridge (brown generator field lead) to #214 on the SCR bridge.

6.Negative side of the SCR bridge to #212 on the SCR bridge.

7.Across C6 on the SCR bridge.

8.#1 on the two diode aluminum finned heat sink to #212 on the SCR bridge.

9.#1 on the two diode aluminum finned heat sink to #213 on the SCR bridge.

10.#2 on the base of D4, single diode mount- ed on copper heat sink to #75 on SCR bridge.

11.Across each of the three-phase bridge diodes, jumper from the heat sink across the diode on all six diodes.

NOTE: All jumpers must be as short as possible

SAM400 & 650

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Contents
IM568 SAM400 SafetyElectric Shock can kill Welding Sparks can cause fire or explosion Sûreté Pour Soudage a L’Arc Précautions DE SûretéThank You Table of Contents Technical Specifications SAM400 InstallationHEIGHT1 Width Depth Weight Height Width Depth Weight Technical Specifications SAM650Machine Grounding Installation PrecautionsProduct Description Spark ArresterOutput Cables PRE-OPERATION ServiceWelder Location Pipe Thawing Operating PrecautionsAdditional Safety Precautions OperationMounting on LN-7 Welder Controls FUNCTION/OPERATIONOutput Studs Portable Field Control ConnectionCurrent and Voltage Controls Toggle SwitchElectrode Polarity Switch ContactorTo Set The Controls -- Stick Welding Variable Voltage WeldingTo Set The Controls -- Submerged Arc SAM400 Controls Operation SAM650 Controls Operation BREAK-IN Period Auxiliary PowerDuty Cycle Starting InstructionsAccessories Bearing Maintenance MaintenanceRoutine Maintenance Periodic MaintenanceAPR97 Commutator and Brush MaintenanceContactor Maintenance Cooling SystemHOW to USE Troubleshooting Guide TroubleshootingFunction Problems Symptoms Course of ActionLoss of Output in Both Modes of Operation Control Boards. Note a Pg. E-2 Recommended SCR Bridge PC Board Test Procedure Diode Test ProcedureControl PC Board Calibration Ground Tests LOW Voltage Option SAM400 Machine Wiring DiagramSAM650 Machine Wiring Diagram Wiring DiagramsMaintenance Instructions Daily Checks SAM400 Engine Wiring DiagramTerminal SAM650 Engine Wiring DiagramDimension Print Dimension Print SAM400 and SAM650 Perkins Engine Welders$700.00 Basic CoursePrecaucion Aviso DE Warranty Costs Statement of Warranty To Obtain Warranty CoverageWarranty Period Warranty Repair