Troubleshooting & Repair | Lincoln Electric SVM127-A guide

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F-21		F-21
TROUBLESHOOTING & REPAIR
TROUBLESHOOTING GUIDE		Observe Safety Guidelines
	detailed in the beginning of this manual.

PROBLEMS	POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)	MISADJUSTMENT(S)	COURSE OF ACTION

	STARTING PROBLEMS
Voltage seems to be too high or the	1. Adjust the "start" trimmer on the	1. The LN-9 voltage PC board may
arc flares at the start of weld.	voltage PC board. It should be	be faulty. Replace.
Welding is good.	only slightly higher than the weld
	voltage. See Starting Charac-
	teristics in the Operation section
	of this manual.
	2. Put the Lincoln power source in
	the "Machine Control" mode.
	Jumper the "BYPASS" pins on
	the LN-9 voltage PC board.
	Adjust the weld voltage from the
	power source for the process
	being used. If the correct volt-
	age cannot be set, the power
	source may be faulty.
	3. Check for correct control cable
	connections to the power
	source.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.

LN-9 Wire Feeder

Image 79

Lincoln Electric SVM127-A service manual Troubleshooting & Repair

Contents

LN-9 Wire Feeder LN-9 Wire Feeder Safety ARC Rays can burn Electric Shock can killFumes and Gases can be dangerous Iii Cylinder may explode if damaged Précautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications LN-9 InstallationWidth Height Mounting the Unit Installing the LN-9F Roll and 4-ROLL ModelsAttaching the Wire Reel Stand Mounting the Wire Feed Unit Routing the Electrode Power Input Cable AssemblyLN-9S Wire Feed Unit Electrical Connections LN-9N, S and LN-9F Figure A.2 Strain Relief Clamp Figure A.4 LN-9F Control BOX Bottom View Figure A.5 for DC-250, DC-400 and CV-400, CV-500 l Connecting the Power Input Cable Assembly to Power Sources Can kill Figure A.6 Connection of LN-9 to DC-600 Power Sources Figure A.7 Connection of LN-9 to DC-1000 Power Sources Installation Table A.1 Work Cable Sizes Machine GroundingWork Cable Connection Direct Work Lead Connection Figure A.9 GUN Cable Connections Connecting the GUN Cable to the Wire Feeder LN-9 Wire Feeder Table of Contents Operation Section Operation Safety Instructions General Description DC Constant Voltage Power SourcesRecommended Processes and Equipment Controls and Settings Figure B.1 Wire Feeder Controls for LN-9N, NE, S, SE LN-9F Control BOX Bottom View Figure B.2 Wire Feeder Controls for LN-9F Avoiding Grounding Lead Protector GLP Shutdown Circuit Protection and Automatic Shutdown Automatic Shutdown Figure B.3 2 Roll Wire Feed Mechanism Drive Roll Installation and Pressure Setting Setting the Idler Roll Spring Pressure 2-ROLL Wire Drives Setting the Idler Roll Pressure 4-ROLL Wire Drives Operation Figure B.4 Installing Drive Rolls on a 4-ROLL Feeder Loading and Feeding READI-REELS or Spools Wire Loading When Using the Extension Assembly models LN-9NE and LN-9SE Electrode Feeding and Brake AdjustmentLoading a 15 to 30 LB. Spool 12 Diameter Figure B.6 Loading a 50 or 60 LB. Coil Electrode Feeding Pulse Power 500, DC650 PRO Adjust the Power SourceSAM Select Acceleration Adjust the LN-9 ControlsStarting Characteristics Voltage Control Response Security of Weld Procedure Settings Procedure AT END of CoilMaking a Weld Table of Contents Accessories Auxiliary Equipment Contacts Optional Equipment and AccessoriesPower Input Cable Assemblies K196, K595, K596 Wire Reel Stands and Mountings Spindle for READI-REELS and 2 I.D. Spools K162-H Attaching the Wire Reel StandsWire Reel Door KIT M-11514 50-60 LB. Wire Reel Assembly for Customer Mounting K299 Process Model Electrode Rating GUN and Cable AssembliesTable C.1 LN-9 GUN and Cable Assemblies 60% Duty Pulse Power Filter Conversion KIT K442-1 Wire Feeder AccessoriesBurnback Delay KIT K202 Dual Procedure KIT K319 K320 Flux Tank Loading Swivel Platform K178-1Undercarriage K163 Continuous Flux Feed Tank K320 Mechanized Hand Travel Unit K110 Mechanized Travel Power Pack K161-CABLE LengthPower Extended Wire Drive K392 Magnetic Separator K58 Aluminum Electrode Table C.2 Drive Roll and Guide Tube KitsKit Roll Solid Steel Electrode Cored Electrode Table of Contents Maintenance Routine Maintenance Safety PrecautionsPeriodic Maintenance Figure D.1 LN-9 Connectors GUN and Cable Maintenance Figure D.3 General Component Locations Table of Contents Theory of Operation Section Theory of Operation Power Input Circuits Figure E.3 Trigger and Shutdown Circuit Trigger and Shutdown Circuit Figure E.4 ARC VOLTAGE, Wire Speed Control and Metering ARC VOLTAGE, Wire Speed Control and Metering Printed Circuit Board Functions LN-9 Wire Feeder Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & Repair PC Board can be damaged by static electricity PC Board Troubleshooting Procedures Observe Safety Guidelines Troubleshooting GuideDetailed in the beginning of this manual Function Problems Trigger Troubleshooting & Repair Troubleshooting Guide Troubleshooting & Repair Trigger Interlock Function Problems Perform the T1 Transformer Perform the T2 Transformer Troubleshooting & Repair Perform Out of Voltage Range Feeding Problems Welding Problems Troubleshooting & Repair Meter Function Problems Bypass Starting Problems Troubleshooting & Repair Symptoms Misadjustments Course of Action Problems Possible Areas Description T1 Transformer TestMaterials Needed T1 Transformer Test Test Procedure Figure F.2 Secondary Leads #601 and #602 AT Lead Splices T2 Transformer Test T2 Transformer Test Figure F.3 Protection Circuit Troubleshooting Nameplate Circuit Breaker Lead Lead Wire Drive Motor and Tach Feedback Test Wire Drive Motor and Tach Feedback Test Apply 115 VAC power Figure F.7 Leads #525, #510, #555 on Control PC Board Tach Feedback Test Procedure Voltmeter Accuracy Test Figure F.8 Voltmeter Connection Point Voltmeter Accuracy Test Return Return to Section TOC Meter Circuit Accuracy Test Figure F.9 Meter PC Board Locations and Cover Meter Circuit Accuracy Test Figure F.10 Meter PC Board Test Points Test Meter PC Board Accuracy. For LN9-H Test Meter PC Board Accuracy. All Models Metric Model Metric Range SET M/MIN Reading Test Voltmeter Test Meter PC Board Accuracy. Metric Models Only Wire Speed Accuracy Test Check for the proper drive roll revolutions per minute Wire Speed Accuracy Test OUT of Voltage Range Shut Down Test Figure F.11 Voltage PC Board with Jumpers OUT of Voltage Range Shut Down Test Section TOC General Power Supply Tests Also perform the T1 Transformer Test General Power Supply Tests General Power Supply Checks Digital Meter and Meter PC Board Removal Replacement Digital Meter and Meter PC Board Removal ReplacementMeter PC Board Removal Replacement Procedure Digital Meter Removal Procedure Reed Switch CR2 Removal and Replacement Replacement Reed Switch CR2 Removal and Replacement T1 Transformer Removal and Replacement Figure F.16 Primary Lead #31 AT R1 Resistor T1 Transformer Removal and Replacement Lead NUT and Screw Control PC Board 1CR Relay Phillips Screws Terminal Tach PC Board Removal and Replacement Figure F.21 Tach Assembly Cover Screws Tach PC Board Removal and Replacement Phillips Screw Disc NUT Tach PC Board Figure F.24 Tach Component Assembly Reassembly Drive Motor Removal and Replacement Figure F.25 TOP Motor Plate Screws Drive Motor Removal and Replacement Nuts and Washers 4-ROLL Feeders Mylar Insulator Glastic Mounting Board Bolts Mounting Screws Insulators Gear BOX Assembly Retest After Repair Retest the LN-9 wire feeder LN-9 Wire Feeder Electrical Diagram Section LN-9 Wire Feeder LN-9 Electrical Diagrams Operating Schematic 21145 Meter Board L6687 Schematic 20031 Trigger Board M13861 Schematic 19852 Tachometer Schematic