Lincoln Electric LF-72/74 service manual Board

Page 110

TOC

TOC

G-4

ELECTRICAL DIAGRAMS

G-4

WIRING DIAGRAM - ENTIRE MACHINE - CODE 11290, 11291, 11292,11293 (L12146-2) LF-72

 

CAVITY NUMBERING SEQUENCE

GENERAL INFORMATION

 

(COMPONENT SIDE OF P.C. BOARD)

ELECTRICAL SYMBOLS PER E1537

1

1

2

1

3

 

 

J3

J7

 

J2

 

COLOR CODE

 

2

3

4

4

6

 

B -

BLACK

 

 

 

 

 

1

4

 

1

8

W -

WHITE

J5,J8

 

J1,J14

 

 

R -

RED

J9,J60

 

 

 

U -

BLUE

8

 

9

16

5

 

 

 

552B

552

577

 

 

WIRE FEED

 

3

 

 

 

SPEED

576

2

10K/2W

 

1

 

CONTROL

575

 

 

POTENTIOMETER

 

 

N.C.

 

75A

1

75

77

 

 

REMOTE

 

 

 

 

 

 

CONTROL

 

 

 

 

3

10K/2W

76A

2

76

76

2

VOLTAGE

77A

3

77

 

1

 

POTENTIOMETER

75

 

 

(OPTIONAL)

 

 

 

 

N.C.

 

4

 

 

 

 

1

1

L2

 

INPUT ELECTRODE

 

P7

B

 

 

 

 

2

2

 

67

CABLE CONNECTION

N.B.

 

 

 

 

 

 

 

A 3

3

551A

 

 

 

 

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Return to Master TOC

Return to Master TOC

Return to Master TOC

 

 

GAS

 

 

4

4

 

 

 

 

FEED

 

 

 

 

 

 

 

 

 

 

 

SOLENOID

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PLATE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P11

P4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

553

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TACH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

 

POST-FLOW

 

 

 

 

 

BURNBACK

 

 

 

 

 

 

 

 

 

 

 

 

U

MOTOR /

 

 

J60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TIMER KIT

 

 

 

 

 

 

 

 

 

 

B

GEARBOX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(OPTIONAL)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

3

4

5

6

7

8

 

 

 

 

 

552B

 

 

 

 

 

 

 

B W

601

 

515A

605

607

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

606A

608

 

 

 

BAFFLE

 

 

 

 

1

521

 

 

 

 

 

 

 

 

 

 

 

 

 

N.A.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOUNTED

 

 

 

2

522

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RECTIFIER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DIODE

 

+

 

 

3

551B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BRIDGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

551A

P10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N.E.

4

 

551B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P6

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L6

 

 

551

 

 

 

 

 

 

 

 

 

 

 

 

 

 

41

580 42

 

 

 

3

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

563

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

562

4

U

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

575B

5

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

552A

575

 

L5

 

6

 

 

 

 

 

 

 

 

 

N.B.

 

TRIGGER

 

 

 

 

 

 

551

7

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

575B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

550

8

W

 

 

 

 

 

 

 

 

 

 

INPUT

14 PIN

 

 

 

 

575C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

556

 

A

 

CIRCULAR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONNECTOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

554

 

B

TRIGGER

TO POWER

 

 

L1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SOURCE

 

 

 

 

 

 

 

 

 

N.B.

 

 

 

 

 

 

 

 

 

C

CONNECTOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

J13

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E

 

 

 

 

 

 

 

 

 

 

 

606A

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT

C

2

 

 

 

 

 

 

 

 

 

1B

 

 

 

 

 

 

 

 

 

CONTROL

D

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REMOTE

E

77A

 

 

 

 

 

 

 

 

L3

606

 

 

N.D.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOLTAGE

F

76A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTROL

G

75A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

THERMAL LED

 

I

41

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

42VAC

J

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1W

 

1B

K42

L

 

M

67

 

577

575C

 

576

 

 

4

 

 

 

 

 

 

 

COLD FEED

SENSE

N

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

558

 

 

 

580

550

 

A

563

521

 

587

608

1W K

558 601

589

 

515A

 

 

 

 

 

 

515

S1

 

 

N.B.

 

 

 

 

 

 

 

562

 

554

552A 553

556

 

552

522

 

 

 

 

E

559

515

 

 

 

NOTES:

 

 

 

 

 

 

 

 

 

 

 

605

607

Y

 

606

 

559

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N.A. CAVITY NUMBERING SEQUENCE AS VIEWED FROMCOMPONENT SIDE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N.C.

 

GAS PURGE

1 2

 

3 4

5 6 7 8

9 10 11 12 13 14 15 16

1 2 3 4 5 6

1 2

1 2 3

4

5 6

7 8

9 10 11 12 13 14 15 16

 

 

 

 

 

 

OF BOARD.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TRIGGER

N.B. CAVITY NUMBERING SEQUENCE AS VIEWED FROM LEAD SIDE OF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INTERLOCK

CONNECTOR.

 

 

 

 

 

J1

 

 

 

J2

J3

 

 

 

J14

 

 

 

 

N.C. TOGGLESWITCHES AND POTENTIOMETERS SHOWN FROM

 

 

 

 

 

 

 

COMMON ANALOG P.C. BOARD

 

 

 

 

 

 

 

589

S2

CONNECTION SIDE OF SWITCH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

587

 

N.D. PIN NEAREST THE FLAT EDGE OF LED LENS ALIGNS WITH WHITE LEAD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N.A.

 

 

OF LEDSOCKET.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2-STEP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N.E. P6 NOT USED.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N.C.

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L12146-2

NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The wiring diagram specific to your code is pasted inside one of the enclosure panels of your machine.

LF-72/74

Page 109 Page 111
Image 110
Page 109 Page 111
Contents LF-72/74 Safety Electric Shock can kill Welding Sparks can cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Section A-1 Table of ContentsInstallation Section Installation Amp Rating Duty CycleMounting Safety PrecautionLocation Boom Mount Bench MountSwivel Mount SuspendedWeld Cable Sizes Coaxial Weld Cables Weld Cable ConnectionControl Cable Connections INSTALLATIONA-7Analog Control Cable Pin Function Miller Power Source Lincoln Wire FeederAnalog Miller Control Cable Adapter K2335-1 Remote Sense Lead Specifications Wire Drive SystemsWelding GUN/WIRE Feeder Trigger Connector High Frequency ProtectionWelding GUNS, Torches and ACCES- Sories Magnum GUN and Cable AssembliesRolls.FIGURE A.4 Procedure for Changing Drive and Idle Roll SetsWire Drive Configuration Set the pressure arm as follows See Figure A.6 Pressure ARM AdjustmentGun Receiver For use With Bushing Wire Reel Loading Weld Wire Routing Figure A.9Shielding GAS Connection Conduit Kits Installing ElectrodeTo install Lincoln conduit See Figure A.10b For Codes 11209, 11210, 11211 and aboveAluminum Wire Preparations Figure A.12bINSTALLATIONA-18 Base Model Bench Model Standard Duty Bench Model Heavy DutyTypical System Configurations CableLF-72/74 Operation Section Section B-1Operation GAS Input Work ConnectionRecommended Processes Common Welding AbbreviationsProduct Description Front Panel Controls and Connections Figure B.1 Case Front Controls DescriptionStep Trigger Interlock Switch Burnback and Postflow Timer KITCold FEED/GAS Purge Switch Remote Voltage Control KITGUN Receiver Bushing K1500-2 Wire Feed Speed KnobTrigger Connector 5-PIN Amphenol Trigger InterlockAccessories Section Section C-1Accessories Optional KitsLF-72s Accessories Key LF-72/74 Maintenance Section Section D-1Calibration Specification MaintenanceMaintenance Routine MaintenanceFigure D.1 Figure D.3 Major Component Location Section AA-1 Section AAModel WFS Range Wire SizesAA-2 AA-3 Figure AA.1AA-4 AA-5 AA-6 Coaxial Weld CableK1797-xx INSTALLATIONAA-7AA-7 AA-8 Drive Roll Kits Steel or Cored Wires AA-9AA-10 Figure AA.3Lation or changing drive rolls and/or AA-11Changing the Gun Receiver Bushing GuidesAssembly of Drive Rolls and Wire Guides AA-12AA-13 Set the pressure arm as follows See Figure AA.8AA-14 AA-15 Loading 16 to 44 lb .3 20kg Spools See figure AA.8AA-16 Figure AA.11AA-17 Figure AA.12aAA-18 Figure AA.12bAA-19 AA-20INSTALLATIONAA-20 Common Equipment SET-UPSFigure AA.15 High Volume Production AA-21Figure AA.16 Portable Welding AA-22Section BB-1 Section BBBB-2 Fcaw Innershield or OutershieldRequired Equipment BB-3BB-4 Figure BB.1 Case Front Controls DescriptionK2426-3 model BB-5K2426-1 and K2426-2 models Switch BB-6Section CC-1 CC-2 CC-3 CC-4 CC-5 CC-6 Section DD-1 Section DDWhen inching with gun trigger, electrode To verify the wire feed speedNal wiring WFS knob setting Could remain energized Several secondsMAINTENANCEDD-3 DD-3Figure DD.3 Major Component Location DD-4Theory of Operation Section Section E-1Theory of Operation Return to SectionControl Board LF-72/74 Troubleshooting & Repair Section Section F-1Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Function Problems Function Problems Troubleshooting & Repair Drive Motor and Tach Feedback Test Test DescriptionTest Procedure Troubleshooting and Repair GAS Solenoid TestTest Procedure Figure F.3 Leads 552, 552BDiode Bridge Test 552B + 552A Wire Speed Potentiometer Test Wire Speed Potentiometer Test 14F-14PC Board Removal and Replacement Control PC Board Removal and Replacement Procedure Removal Procedure Replacement ProcedureTroubleshooting and Repair Wire Drive Motor and Gear BOX Removal and Replacement ProcedureProcedure Replacement Procedures SET UP Operation VerificationLF-72/74 Electrical Diagrams Section Section G-1Electrical Diagrams LF-72/74Timer KIT Board Normal Speed Micro Internal panel Motor Connecter Summary High Torque Setting engages Schematic Common Analog Control PC Board G4559 Sheet Electrical Diagrams Electrical Diagrams PC Board Assembly Common Analog Control G4560-2E0
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