Lincoln Electric SVM176-A service manual 14TROUBLESHOOTING and REPAIRF-14, Potentiometer Test

Page 42
LN-23P

Section TOC

Master TOC

F-14TROUBLESHOOTING AND REPAIRF-14

POTENTIOMETER TEST (cont.)

FIGURE F.4

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535

LN-23P

Control

Board

641

642

TEST PROCEDURE

WIRE SPEED CONTROL POTENTIOMETER

1. Disconnect leads 641, 642 and 535 from the Control Board. (See Figure F.4)

a. Check resistance between lead 535 and lead 641 for a reading of 10kΩ +/-10%.

A low reading or an ʻopenʼ reading indicates a defective potentiometer.

b. Connect the ohmmeter to leads 641 and 642, and rotate the control slowly from min to max speed setting.

The meter should vary smoothly from 10kΩ to 0 Ω.

c. Repeat test ʻbʼ with meter connected to leads 642 and 535.

Any irregularity or ʻskippingʼ in the meter read- ing indicates a defective potentiometer.

d. Check all three leads to the potentiometer case. Reading must be >500kΩ.

Codes Below 10892

77

 

 

F

75

E

A

76

D

B

 

C

 

 

Codes 10892 & Above

76

 

75

G

F

A

 

H

77

E

B

 

D

C

 

VOLTAGE CONTROL POTENTIOMETER For codes above 10892 (8 pin connector)

1. Disconnect the Control Cable from the back of the feeder.

NOTE: See Figure F.4 for Pin locations

a. Check resistance from Pin F(75) to Pin H (77) of the box connector for a reading of 10kΩ +/- 10%.

A low reading or an ʻopenʼ reading indicates a defective.

b. Connect the meter from Pin F(75) to Pin G(76) and rotate the control slowly from min to max voltage setting.

The meter should vary smoothly from 0 Ω to 10kΩs.

c. Repeat test ʻbʼ with meter connected to Pins G and H.

Any irregularity or ʻskippingʼ in the meter read- ing indicates a defective potentiometer.

d. Check all three leads to the potentiometer case. Reading must be >500kΩ.

NOTE: Codes below 10892 have a 6 pin connector. Test points will be pins E(75), D(76) and F(77)

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Contents Safety Depends on You LN-23PFor Engine SafetyPowered equipment Electric Magnetic FieldsElectric Shock can kill ARC Rays can burn Fumes and GasesCan be dangerous For Electrically Cylinder may explodeCause fire or explosion If damaged IiiLES Machines À Souder À Précautions DE SûretéPrécautions DE Sûreté Pour Transformateur ET ÀMaster Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications LN-23PEnvironmental Rating Work Cable and Remote Voltage Safety PrecautionsInput Cable Sensing Work LeadWire Drive Rolls and Guide Tubes Optional Features InstallationInnershield GUN and Cable Accessories Power SourceLN-23P Table of Contents Operation SectionOperation Section B Loading the Wire Reel OperationProduct Description Voltage Adjusting Wire Feed SpeedDrive Roll Pressure Making the WeldLN-23P Accessories Section Accessories Section CGUN and Cable Assemblies Enclosed Wire Reel SupportOptional Equipment K350 Adapter KITMaintenance Section Maintenance Section DWire Drive Assembly Maintenance MaintenanceGUN and Cable Maintenance Removing Idle Roll AssemblyCircuit Protection NameplatesLN-23P Theory of Operation Section Section E E-2E-2E-3E-3E-3E-4Input Power Circuit Theory of OperationGeneral Description Figure E.3 Control Circuits Optional Circuits K350 / K350-1ADAPTER KitsK350 / K350-1ADAPTER Kits LN-23P Troubleshooting and Repair Troubleshooting and Repair Section FSection F-1 How To Use Troubleshooting Guide Important Troubleshooting TipsTroubleshooting & Repair PC Board Troubleshooting ProceduresElectric Shock Gun Perform Potentiometer Test K350 Adapter Problems Call LN-23PWire Feeder Test Test DescriptionMaterials Needed Wire Feeder Test Test ProcedureGUN Test 10TROUBLESHOOTING and REPAIRF-10 GUN TestFeed Head Test 12TROUBLESHOOTING and REPAIRF-12 Feed Head TestPotentiometer Test 14TROUBLESHOOTING and REPAIRF-14 Wire Speed Control PotentiometerPotentiometer Test K350-1 Adapter Test 16TROUBLESHOOTING and REPAIRF-16 K350-1 Adapter TestMeasurement Points Expected Reading 18TROUBLESHOOTING and REPAIRF-18 Calibration CheckElectrical Diagrams Section Electrical Diagrams Section GSection G-1 Electrical Diagrams Wiring Diagram Entire Machine M14197Schematic Entire Machine L6518 Wiring Diagram K350 Adapter KIT M14247 Wiring Diagram K350-1 Adapter KIT M17514 Machine Schematic for K350/K350-1 Adapter PC Board Assembly for Codes below 10892 G1528-4 PC Board Assembly for Codes 10892 and Higher G4184-3 Schematic for LN-23P Codes 10892 and Higher L11838-3

SVM176-A specifications

The Lincoln Electric SVM176-A is a robust and versatile semiautomatic wire feeder designed to cater to a wide range of welding applications. Known for its reliability and ease of use, the SVM176-A is particularly favored in both industrial and construction settings, where efficiency and performance are paramount.

One of the standout features of the SVM176-A is its compact design. This relatively lightweight unit is easy to transport and can fit into tight spaces, making it an ideal choice for mobile applications or projects that require more maneuverability. The unit's construction is durable and built to withstand the rigors of demanding work environments, ensuring longevity and consistent performance.

The SVM176-A supports various welding processes, including MIG (Metal Inert Gas) and flux-cored arc welding, providing versatility for different materials and thicknesses. This adaptability is enhanced by its ability to accommodate a variety of wire sizes, allowing users to select the ideal wire type for their specific project requirements. The equipment also features adjustable wire feed speed, helping to ensure optimal weld quality by allowing operators to tailor their settings based on the needs of the job.

Innovative technologies in the SVM176-A contribute to its performance. The unit is equipped with a digitally controlled microprocessor that streamlines operations, providing enhanced control over welding parameters. This advanced technology enables users to achieve precise welds consistently, minimizing the risk of defects and improving overall efficiency.

Another remarkable characteristic of the SVM176-A is its user-friendly interface. The unit features easy-to-read displays and intuitive controls, enabling operators to make quick adjustments without having to consult an extensive manual. This is particularly beneficial in fast-paced work environments where time is of the essence.

Furthermore, the Lincoln Electric SVM176-A boasts a range of safety features, including thermal overload protection and a sturdy casing, which safeguard both the equipment and the operator. With these characteristics combined, the SVM176-A stands out as a preferred choice for professional welders seeking reliability, versatility, and operational excellence in their equipment. This exceptional wire feeder continues to uphold Lincoln Electric's commitment to quality and performance in welding technology.
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