Lincoln Electric SVM132-A service manual Perform the 1CR Relay Test

Page 57

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F-7

 

TROUBLESHOOTING AND REPAIR

F-7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

 

 

 

 

 

 

PROBLEMS

 

POSSIBLE AREAS OF

RECOMMENDED

 

 

 

(SYMPTOMS)

 

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

 

 

 

FUNCTION PROBLEMS (Continued)

 

 

 

 

 

 

 

 

 

 

 

The wire feed speed cannot be

1.

If the LN-8 is being used for sub-

1.

Check for loose connections

 

 

 

controlled. The motor runs and

 

merged arc welding with the vari-

 

between the speed control, the

 

 

 

feeds wire but the speed cannot

 

able voltage board switch in the

 

control board, and the variable

 

 

 

be changed regardless of control

 

VV position, change it to the CV

 

voltage board. See wiring

 

 

 

setting.

 

 

position. If proper motor speed

 

diagram.

 

 

 

 

 

 

 

control returns, the variable volt-

 

 

 

 

 

 

 

 

 

age board may be faulty.

2.

Check the speed control rheostat

 

 

 

 

 

 

 

 

for proper operation. Normal

 

 

 

 

 

 

 

 

 

resistance is 5000 ohms.

 

 

 

 

 

 

 

 

3.

Perform the Drive Motor Test.

 

 

 

 

 

 

 

4.

The control board may be faulty.

 

 

 

 

 

 

 

 

 

The wire feed “coasts” when the

1.

Make sure the gun trigger is not

1.

Perform the 1CR Relay Test.

 

 

gun trigger is released.

 

 

“sticking”.

 

 

 

 

 

 

 

 

 

 

 

 

 

The wire feeds normally and welds

1.

Check or replace the solenoid.

1.

With the gun trigger activated,

 

 

 

but the solenoid is not operating.

 

 

 

check for the presence of

 

 

 

 

 

 

 

 

 

115VAC at terminals 32A and 7.

 

 

 

 

 

 

 

 

If the proper voltage is present,

 

 

 

 

 

 

 

 

the solenoid may be faulty. If the

 

 

 

 

 

 

 

 

correct voltage (115VAC) is NOT

 

 

 

 

 

 

 

 

present, the relay board may be

 

 

 

 

 

 

 

 

faulty.

 

 

 

 

 

 

 

 

 

 

 

When the gun trigger is activated

1.

Check wire feed direction switch

1.

The 1CR relay may be faulty.

 

 

 

the wire “backs up” instead of feed-

 

for proper direction and operation.

 

Check or replace.

 

 

 

ing forward.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-800-833-9353.

LN-8

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Contents LN-8 Semiautomatic Wire Feeder LN-8 SafetyElectric Shock can kill Iii Welding Sparks can cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Installation LN-8 with K303 Electrode DiameterLN-8 with K377 LN-8 with K378Power Source Connections Table A.1 Work Lead SpecificationsLN-8N and LN-8NE LN-8S and LN-8SE and Converted LN-8N and LN-8NE Power Source Selection Switch Variable Voltage PC BoardTable A.2 LN-8 Power Source Connection Diagrams Power Source Connection DiagramsSection TOC Installation TOC Figure A.5 Connection of LN-8 to R3S-250 and R3S-325 9A-9Figure A.6 Connection of LN-8 to DC-600 10A-10Power Source To LN-8 Input Cable Plug Control Cable LN-8 for Same Polarity Operation Shock Can Kill LN-8 for Opposite Polarity Operation14A-14 Figure A.10 for Power Sources Other than Lincoln ElectricInput Cable Connections Cable Clamp Conductor Electrode Wire Reel BasecontrolLN-8N and LN-8S LN-8NE and LN-8SEExtension Tube Connector Connections to Wire FeederLocking ScrewSELF-TAPPING Screw Hinge Handle Figure A.14 Wire Feeder Handle InstallationGUN and Cable Assemblies Handling ProceduresLN-8S and LN-8SE Continuous Flux Feed Submerged ARC GeneralOperation Controls and Their Functions Safety InstructionsConstant Current Controls Gouging SparksCurrent Controls Voltage Constant Voltage ControlsAvoiding Ground Lead Protector GLP Activation Circuit ProtectionFigure B.3 Wire Feed Rolls and Guide Tube Installation Wire Feed Rolls and Guide TubesSetting for CV or CC Power Sources Welding with a Constant Voltage Power SourceSlots Coil Reel Mounting a 50 or 60 lb CoilWire Reel Loading K1524-1 Universal Wire Reel Stand K363-P READI-REEL AdapterAdapter 12 in./300 mm Diameter or 14 lb 6 kg To Mount 10 to 44 lb 4.5 to 20 kg SpoolsInnershield Coils READI-REELS a K438 READI-REEL Adapter Must be UsedFeeding Electrode to the LN-8N or LN-8S Feeding Electrode to the LN-8NE or LN-8SE with ExtensionBrass Blocks Hand Crank ARM Slow Acceleration Starting Code 7926 and Above Flux Tank LoadingAccessories General Table C.1 LN-8 Wire Feeder AccessoriesK163 Undercarriage Requires K303, K377, or K378 K161 Mechanized Travel Power PackK178 Mounting Platform K58 Magnetic SeparatorReel Mounting Accessories Constant Current Conversion Parts Welding Guns Welding GUN AccessoriesLN-8 Table of Contents Maintenance Section MaintenanceRoutine Maintenance Periodic Maintenance Theory of Operation Table of Contents Theory of Operation SectionGeneral Description Power Input CircuitsFigure E.2 GUN Trigger and 1CR Contact Control Circuits GUN Trigger and 1CR Relay Contact Control CircuitsFuse Field SCR Operation 5E-5Applied Later CYCLE, the SCR Output Is Decreased LN-8 Troubleshooting and Repair Return to Return to Section TOC HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Troubleshooting & RepairProblems Symptoms Troubleshooting GuideFunction Problems Transformer Test Perform the 1CR Relay Test Feeding Problems Welding Problems LN-8 Electrical Sequence of Operation Figure F.1 LN-8 Electrical Sequence of Operation Test Description Trigger Transformer TestTrigger Transformer Test Internal Voltage Test Receptacle ConnectorCircuit Applied Breaker Control BoardTable F.1 Voltage Test Points Internal Voltage Test1CR Relay Test 1CR Relay Test Table F.2 Relay Test Terminal Connections 1CR Relay TestDrive Motor Test Drive Motor Test 1CR Figure F.6 GUN Terminal Jumper LocationsTable F.3 Drive Motor Test Points To further check the drive motorPotentiometer Replacement Repair Procedure Circuit Breaker Replacement Retaining NUT Ground Lead Protector Switch Mount Flatwasher Lockwasher NUTGround Lead Protector Push Button Switch Replacement Ground Lead Protector Push Button Trigger Transformer Replacement Insulation Sheet Trigger Transformer NUT Relay PC Board Roundhead ScrewPC Board Replacement Control PC Board Variable Voltage PC Board Relay PC Board Figure F.10 PC Board LocationsRelay Board Removal Control PC Board Replacement Wire Drive Assembly and Component Replacement White BlackGreen Ground Yellow Blue TWO#568 #567 ShuntGearbox Insulation Sheet Mounting Plate MotorTOC Retest After Repair Electrical Diagrams LN-8N, -8NE, -8S, and -8SE Wiring Diagram Source Power to Work Connection Schematic1CR Wire Feed Motor Field Operating SchematicControl Board L5767 Schematic Variable Voltage Board L5039 Schematic Control Control Board L5767 LayoutVariable Voltage Board L5039 Layout SVM Error Reporting Form
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