Manuals / Lincoln Electric / Power Tools / Welding System

Lincoln Electric NA-5SF, NA-5NF service manual Meter PC Board Schematic & Layout, 21143

Models: NA-5S NA-5N NA-5SF NA-5NF

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G-11

ELECTRICAL DIAGRAMS

G-11

METER PC BOARD SCHEMATIC & LAYOUT

21143

S

514

515

511

512

SET

ACTUAL

510A

510B

516

513

WIRE

VOLTS

SPEED

TO DIGITAL METER

10 VAC

518

562

TP4

510C

510

+5V

+5V

A

3

4

E

C

2

1

B

D

5

517

518

510

510C

6

3

4

10

8

2

1

7

9

5

602

601

B5

B6

B2

B3

B4

B1

J14

J14

J14

J14

J14

J14

J14

J14

J14

J14

D1

R1

24.3K

D5

C4

TP5

CW

D2

R2

2K

C2

OUT

X1

IN

C1

500

4.7

50V

35V

GND

D3

C3

TP4

R3

2.8K

D4

NOTES :

GENERAL INFORMATION

LABELS

FILE: S21143_1CA

N.A.

SINCE COMPONENTS OR CIRCUITRY ON

A PRINTED

ELECTRICAL SYMBOLS PER E1537

CIRCUIT BOARD

MAY CHANGE

WITHOUT AFFECTING

SUPPLY

VOLTAGE NET

FRAME CONNECTION

THE INTERCHANGEABILITY

OF A COMPLETE

BOARD.

CAPACITORS =

MFD ( .022/50V

UNLESS OTHERWISE SPECIFIED)

POWER SUPPLY SOURCE POINT

THIS DIAGRAM MAY NOT

SHOW THE EXACT COMPONENTS

RESISTORS = Ohms (

1/4W UNLESS OTHERWISE SPECIFIED)

EARTH GROUND CONNECTION

OR CIRCUITRY OF

CONTROLS HAVING A COMMON

CODE NUMBER.

DIODES =

1A, 400V

(UNLESS OTHERWISE SPECIFIED)

COMMON CONNECTION

UNLESS OTHERWISE SPECIFIED TOLERANCE

Ch'ge.Sht.No.

THE LINCOLN ELECTRIC CO.

EQUIP.

LN-9, LN-9F, NA-5

ON HOLES SIZES PER E-2056

3-25-94

TYPE

ON 2 PLACE DECIMALS IS + .O2

CLEVELAND, OHIO U.S.A.

METER BOARD SCHEMATIC

ON 3 PLACE DECIMALS IS + .OO2

SUBJECT

ON ALL ANGLES IS + .5 OF A DEGREE

NONE

SCALE

MATERIAL TOLERANCE ("t") TO AGREE

SHT.

S 21143

DR.

FM

9-23-93

WITH PUBLISHED STANDARDS

DATE

CHK.

SUP'S'D'G.

NO.

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		517
	R1		C4
			C4
R2
	R3		601
	C3	518	510C
		518	510C
		510	602
	J14
	C2
D2	D4	D5
D1	D3
L6685-1	METER		X1
			X1
	C1

ITEM

REQ'D

PART NO.

IDENTIFICATION

NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not avail- able from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in

danger to the Machine Operator or Technician. Improper PC board repairs could result in damage to the machine.

NA-5

Image 151

Lincoln Electric NA-5SF, NA-5NF service manual Meter PC Board Schematic & Layout, 21143

Contents

NA-5NF NA-5S NA-5SF Safety Depends on YouISAFETYi Fumes and Gases can be dangerous SafetyElectric Shock can kill ARC Rays can burnWelding Sparks can cause fire or explosion Cylinder may explode if damagedSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Return to Master TOC Installation Section Table of ContentsInstallation Section a Technical Specifications NA-5 InstallationFT 1.2 M Cable Control Cable Power Source TachometerElectric Shock can kill Mechanical InstallationControl BOX Installation IntroductionThread Holes View from Bottom Welding Head InstallationPlaces HolesTable A.1 Electrical InstallationInput Power Requirements Control BOX to Welding Head ConnectionsPower Supply to Control BOX Connections Electrode Polarity Power Source Connection DiagramsFigure A.8 Connection of NA-5 ALL to a DC-600 Figure A.9 Connection of NA-5 ALL to a DC-650 PRO With no Line Voltage Compensator Obsolete Figure A.10 Connection of NA-5 ALL to a R3S-400, -600, orSAM Power Source Settings Power Source TAP To NA-5 Input Cable Plug Figure A.13 Connection of NA-5 to DC-1000 or DC-1500 Figure A.14 Connection of NA-5 to DC-400 or CV-400 NA-5 Operating Instructions Section Table of ContentsWelding Sparks Safety PrecautionsOperating Instructions OPERATOR’S InstructionsExposed Controls with Lockable Cover Down Controls Their FunctionsControls Under the Lockable Security Cover Auto TAB Setup InstructionsSee the Starting and Stopping Sequences section Travel Starting and Stopping section Starting and Stopping SequencesMeans of ARC Striking Travel Starting and Stopping orStopping Sequences Setting Travel Starting and StoppingReconfiguring the Travel Sequences Starting SequencesTravel Starts Travel Stops Older Models Newer Models Table B.1 Travel Sequence Lead and Switch PositionsBurnback and Electrode Backup Wire Feed Motor Acceleration Electric Shock can killOptional Crater Controls Voltage Control Response Table B.2 Stopping Sequence SettingsStart Circuitry Automatic ShutdownCold Start Circuitry Electrode BackupAuto Stop Security of Weld Procedure Settings Accessories Section Table of ContentsProduct Number Product Name AccessoriesTable C.1 NA-5 Automatic Welding System Accessories GeneralListing of Accessories K239 Twinarc KIT for Innershield Electrodes K281 Solid Wire Straightener for Tiny TwinarcK225 Submerged ARC Twinarc KIT K238 High Frequency UnitControls Relay Modules K337 Weld Timer Module SPEED-FEED ReelK349 MULTI-PROCEDURE KIT K334 Start and CraterNA-5 Maintenance Section D Maintenance SectionCircuit Protection MaintenanceControl BOX GeneralFAST-BLOW Fuse Ground Fault Fuse ProtectionPipe Plug Changing Wire Feed Gear Ratios Wire Drive MotorFlux-Cored Electrode Wire Drive MechanismWire Straighteners Solid ElectrodeOptional Features Theory of Operation Table of Contents Theory of Operation SectionGeneral Description Input Power CircuitsBoards Power and VoltageCONTROL, Logic Procedure Boards5E-5 Optional START, Crater Fill and Weld Timer BoardsFigure E.4 SCR Operation NA-5 SCR OperationTable of Contents Troubleshooting and Repair Section Troubleshooting & RepairRecommended Course of Action HOW to USE Troubleshooting GuideBoard can be dam- aged by static electricity PC Board Troubleshooting ProceduresPossible Areas SymptomsDrive Motor Test T2 Transformer TestTest Possible Areas Recommended SymptomsPerform the Wire Drive Motor Course of ActionTroubleshooting & Repair Problems Possible Areas Recommended Symptoms To Section TOC ResistanceTest Perform the #21-#67 ExternalTroubleshooting & Repair Transformer Test Perform the DC Power SupplyProblems Possible Areas Recommended Symptoms Troubleshooting & Repair Mode Function Problems Troubleshooting & Repair Troubleshooting & Repair Troubleshooting & Repair Problems Wire Drive Motor Test Function ProblemsTOC Travel Function Problems Troubleshooting & Repair Section Problems Possible AreasAccuracy Test Accuracy Test Perform the Meter Circuit Function ProblemsPerform the Meter Circuit Accuracy Test Feedback TestIf the Tach Board Feedback Perform the Voltmeter AccuracyProblems Perform the Out of Voltage Range Shutdown Test Circuit breaker trips when Power board may be faulty Circuit breaker trips after Check to make sure there are not STARTING/WELDING Problems Welding Problems Function Problems Welding Problems Welding Problems PC Board LED Light Definitions PC Board LED Light Sequence Table Above Code Test Description DC Power Supply TestMaterials Needed Also check associated leads DC Power Supply TestTest Procedure Plugs for loose or faulty connecDC Power Supply Test Table F.1 DC Power Supply Checks Test Description T1 and T2 Transformer TestFigure F.2 T1 and T2 Transformers ProcedureReturn to Section Return to Section TOC Test Description Voltage Board Transformer TestVoltage Board Transformer Test Test Procedure24VAC Secondary Test Points Test Description Wire Feed Drive Motor TestVDC supply Supply Turned Wire Feed Drive Motor TestArmature Voltage First pins Motor Applied Voltage TestExternal Resistance Test Leads #21 and #67 Table F.2 External Voltage Sensing Leads Test Points External Resistance Test Leads #21 and #67Test Points Expected Comments Resistances Conditions OUT of Voltage Range Shut Down Test Figure F.6 Voltage Board and PIN Locations OUT of Voltage Range Shut Down TestReturn to Section Return to Section TOC Test Description Tach Board Feedback TestTach Board Feedback Test ProcedureVoltmeter Accuracy Test Figure F.7 Test Meter Connection Points Voltmeter Accuracy TestCR3 Relay Test Description Wire Speed Accuracy TestTest Procedure Wire Speed Accuracy TestTable F.4 Troubleshooting & Repair Test Description Meter Circuit Accuracy TestTest for AC supply to the volt- meter PC board Meter Circuit Accuracy TestNA-5 SET Volts Reading Test Voltmeter Reading Test Voltmeter PC Board Accuracy Test for DC volts on the speed- meter PC board Test for AC supply to the speed- meter PC boardNA-5 SET Speed Reading Test Voltmeter Reading IPM Test Speedmeter Digital Meter AccuracyTest Speedmeter PC Board Accuracy Description PC Boards Removal and ReplacementReplacement Procedure PC Boards Removal and ReplacementDigital Meter and Meter PC Board Removal and Replacement Figure F.11 Meter PC BOARD, Mounting Nuts and Plug Meter PC Board Removal ProcedureFigure F.12 Meter Bezel and Screw Locations Digital Meter Removal ProcedureReplacement Procedure Description Tach PC Board Removal and ReplacementPickup Assembly Wire Drive Motor Tach Cover Tach PC Board Removal and ReplacementPhillips Screw Disc NUT Tach PC Board Reassembly Description Wire Drive Motor Removal and ReplacementMotor Removal Procedure Wire Drive Motor Removal and ReplacementPerform the Tach Board Removal Procedure Figure F.17 Drive Motor Motor Replacement Procedure Retest After Repair Gear Ratio Wire Speed Range in/min m/minNA-5 Table of Contents Electrical Diagrams Section Electrical DiagramsNA-5 Wiring Diagram KEY to Symbols Logic PC Board L6242-1 SchematicLogic PC Board L6242-2 & above Schematic C D E F G H J Power PC Board L6252-1 SchematicPower PC Board L6252-2 & above Schematic Return to Voltage PC Board SchematicC D E F G H L M Control Circuit SchematicStart Module Weld Timer Crater Module Burnback Timer Procedure PC Board SchematicTimer Board Option & Timer PC Board Schematics21143 Meter PC Board Schematic & LayoutMiscellaneous PC Boards Power Board Logic Board