Test Meter PC Board Voltage Accuracy | Lincoln Electric SVM138-A

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F-44

F-44

TROUBLESHOOTING & REPAIR

METER CIRCUIT ACCURACY TEST (continued)

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Test Digital Meter Accuracy. (For LN-9 GMA models above code 7980 with separable digital meter and meter boards only).

1.Use a test meter with at least 3-1/2 digits and

± 0.5% accuracy.

2.Connect the + probe to TP4 and the - probe to lead #510C.

NOTE: The coating will have to be removed from the test points.

3.With the meter in SET volts, adjust the voltage control until the test meter matches the set- tings in the table below.

If the LN-9 GMA digital meter does not match the readings, the LN-9 GMA digital meter may be faulty. Replace the digital meter.

LN-9 GMA SET	TEST VOLTMETER
VOLTS READING	READING

15.0 V	.150 ± .004 VDC
30.0 V	.300 ± .004 VDC
60.0 V	.600 ± .006 VDC

Test Meter PC Board Voltage Accuracy.

(All Models)

1.Use a test meter with at least 3-1/2 digits and

± 0.5% accuracy.

2.Connect the + probe to leads #517 and the - probe to lead #510C.

NOTE: The coating will have to be removed from the test points.

3.With the meter in SET volts, adjust the voltage control until the LN-9 GMA meter matches the settings in the table below.

If the test meter does not match the readings, the meter PC board may be faulty. Replace the meter PC board.

LN-9 GMA SET	TEST VOLTMETER
VOLTS READING	READING

15.0 V	1.50 ± .05 VDC
30.0 V	3.00 ± .05 VDC
60.0 V	6.00 ± .07 VDC

Test Meter PC Board Wire Feed Speed

Accuracy. (For LN-9 GMA, LN-9F GMA Models

Only)

1.Use a test meter with at least 3-1/2 digits and

± 0.5% accuracy.

2.Connect the + probe to lead #519 and the - probe to lead #510C.

NOTE: The coating will have to be removed from the test points.

3.With the meter in SET IN/MIN, adjust the speed control until the LN-9 GMA meter matches the settings in the table below. If the test meter does not match the readings, the meter PC board may be faulty. Replace the meter PC board.

LN-9 GMA SET	TEST VOLTMETER
VOLTS READING	READING

082 IPM	0.50 ± .05 VDC
489 IPM	3.00 ± .05 VDC
978 IPM	6.00 ± .07 VDC

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LN-9 GMA Wire Feeder

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Lincoln Electric SVM138-A service manual Test Meter PC Board Voltage Accuracy, Test Meter PC Board Wire Feed Speed

Contents

LN-9 GMA Wire Feeder Safety Depends on You Safety LN-9 GMA Wire Feeder Electric Shock can kill ARC Rays can burnFumes and Gases can be dangerous Cylinder may explode if damaged Iii Précautions DE Sûreté Master Table of Contents Master Table of Contents cont’d Vii LN-9 GMA Wire Feeder Table of Contents Installation SectionInstallation Section A-1 Installation Technical SpecificationsWidth Height Installing the LN-9 GMA Roll and 4-ROLL Models Attaching the Wire Reel StandMounting the Wire Feed Unit Mounting the Unit Power Input Cable Assembly Electrical Connections LN-9 GMA and LN-9F GMARouting the Electrode Connecting the Power Input Cable Assembly to Power Sources Bottom View Installation Can kill Figure A.5 Connection of LN-9 GMA to DC-600 Power Sources Figure A.6 Connection of LN-9 GMA to DC-1000 Power Sources To LN-9 GMA Input Cable Plug Figure A.8 Connection of LN-9 GMA to V300 Power Sources Machine Grounding Work Cable ConnectionDirect Work Lead Connection Table A.1 Work Cable Sizes Connecting the GUN Cable to the Wire Feeder For GMA GUN CablesThumb- screw Hooking UP GMA Shielding GAS Cylinder may explode if damaged Table of Contents Operation Section Safety Precautions OperationOperating Instructions General Description Recommended Processes and EquipmentK424 LN-9 GMA 2-ROLL and K568-1 LN-9 GMA 4-ROLL K436 LN-9F GMA 2-ROLL and K583-1 LN-9F GMA 4-ROLL DC Constant Voltage Power Sources Controls and Settings Figure B.3 Wire Feeder Controls for LN-9 GMA Figure B.4 Wire Feeder Controls for LN-9F GMA Power Supply Fuse Circuit Protection and Automatic ShutdownAvoiding Grounding Lead Protector GLP Shutdown Circuit Breaker Automatic Shutdown Drive Roll Installation Changing Drive Rolls for 2-ROLL Wire Feeders Guide Tube Detail Changing Drive Rolls for 4-ROLL Wire Feeders Large Wire Loading Figure B.7a Threaded Locking Collar Loading a 50-60 LB .7-27.2 KG. Coil Using K1504-1 Coil Reel Feeding Electrode and Brake Adjustment Adjustable Wire Reel Brake Loading a 50 or 60 LB. Coil Feeding Electrode and Brake Adjustment Idle Roll Pressure Setting Roll Wire Feeders Adjust the Power Source Adjust the LN-9 GMA ControlsPulse Power 500, DC650 PRO DC-250, DC-400, or DC-600 Starting Characteristics RUN-IN FeatureVoltage Control Response Select Acceleration Procedure AT END of Coil Security of Weld Procedure SettingsMaking a Weld LN-9 GMA Wire Feeder Table of Contents Accessories Section Accessories Optional Equipment and AccessoriesPower Input Cable Assemblies K196, K595, K596 Wire Reel Stands and Mountings Attaching the Wire Reel Stands Wire Reel Door KIT50-60 LB. Wire Reel Assembly for Customer Mounting K299 Spindle for READI-REELS and 2 I.D. Spools K162-H Universal Wire Reel Stand K1524-1 Wire Feeder Accessories Burnback Timer KIT K419GUN and Cable Assemblies Table C.1 LN-9 GMA GUN and Cable Assemblies GMA Timer KIT K418 Dual Process KIT K317 For Wire FeedersDual Procedure KIT K319 Pulse Power Filter Conversion KIT K442-1 Swivel Platform K178-1 Undercarriage K163Continuous Flux Feed Tank K320 K320 Flux Tank Loading K58 Magnetic Separator Table C.2 Drive Roll and Guide Tube Kits Kit Roll Solid Steel ElectrodeCored Electrode Aluminum Electrode LN-9 GMA Wire Feeder Table of Contents Maintenance Section Maintenance Routine MaintenancePeriodic Maintenance GUN and Cable Maintenance Proper Speed Sensor Module Mounting3D-3 Figure D.2 LN-9 GMA Connectors Table of Contents Theory of Operation Section Figure E.2 Power Input Circuits Theory of Operation Trigger and Shutdown Circuit Figure E.3 Trigger and Shutdown Circuit ARC VOLTAGE, Wire Speed Control and Metering Figure E.4 ARC VOLTAGE, Wire Speed Control and Metering Power Board Printed Circuit Board FunctionsControl Board LN-9 GMA Wire Feeder Table of Contents Troubleshooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting Guide PC Board Troubleshooting Procedures PC Board can be damaged by static electricity Troubleshooting Guide Observe Safety GuidelinesDetailed in the beginning of this manual Trigger Troubleshooting & Repair Troubleshooting & Repair Troubleshooting Guide Troubleshooting & Repair Interlock Function Problems Test T2 Transformer Troubleshooting & Repair Range Shutdown Test Feeding Problems Welding Problems Troubleshooting & Repair Meter Function Problems Hall Effect Bypass Starting Problems Troubleshooting & Repair Starting Problems T1 Transformer Test DescriptionMaterials Needed Test Procedure T1 Transformer Test Figure F.2 Secondary Leads #601 and #602 AT Lead Splices T2 Transformer Test Figure F.3 Protection Circuit Troubleshooting Nameplate T2 Transformer Test Circuit Breaker Lead 32A Lead Lead Wire Drive Motor Test Wire Drive Motor Test Electric Shock can kill Hall Effect Module Test and Alignment Hall Effect Module Feedback Test Procedure Hall Effect Module Test and Alignment Test Hall Effect Module Alignment Test Procedure Figure F.8 Hall Effect Module Location Voltmeter Accuracy Test Voltmeter Accuracy Test Figure F.9 Voltmeter Connection Point Return Return to Master TOC Meter Circuit Accuracy Test Meter Circuit Accuracy Test Figure F.10 Meter PC Board Locations and Cover Figure F.11 Meter PC Board Test Points Test Meter PC Board Wire Feed Speed Test Meter PC Board Voltage Accuracy Test Meter PC Board Wire Feed Speed Accuracy Metric Model Metric Range SET M/MIN Reading Test Voltmeter Wire Speed Accuracy Test Wire Speed Accuracy Test Check for the proper drive roll revolutions per minute OUT of Voltage Range Shut Down Test OUT of Voltage Range Shut Down Test Figure F.12 Voltage PC Board with Jumpers Section TOC General Power Supply Tests General Power Supply Tests Also perform the T1 Transformer Test General Power Supply Checks Digital Meter and Meter PC Board Removal Replacement Replacement ProcedureDigital Meter and Meter PC Board Removal Meter PC Board Removal Digital Meter Removal Procedure Replacement Procedure Reed Switch CR2 Removal and Replacement Reed Switch CR2 Removal and Replacement Replacement T1 Transformer Removal and Replacement T1 Transformer Removal and Replacement Figure F.17 Primary Lead #31 AT R1 Resistor Figure F.18 Leads #526 and #527 AT Power PC Board NUT and Screw Control PC Board 1CR Relay Phillips Screws T1 Transformer Mounting Screws Terminal Strip Drive Motor Removal and Replacement Drive Motor Removal and Replacement Figure F.22 TOP Motor Plate Screws Nuts and Washers 4-ROLL Feeders Mylar Insulator Glastic Mounting Board Bolts Reassembly Figure F.25 Drive Motor Removal from Gear BOX Retest the LN-9 GMA wire feeder Retest After Repair LN-9 GMA Wire Feeder Section G LN-9 GMA Wire Feeder Electrical Diagrams Wiring Diagram-LN-9 GMALN-9 GMA Wiring Diagram-LN-9F GMA DEC Voltage Board Schematic LN9, LN9F, LN9GMA, LN9FGMA Power PC Board Schematic SHT. no Trigger PC Board Schematic 17950 M PM Control Schematic Circuit Meter Board Schematic 21146 Operating Schematic 525 B