Lincoln Electric IM602-A manual PC Board Troubleshooting Guide Firing P.C. Board

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E-9

TROUBLESHOOTING

E-9

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

PC BOARD TROUBLESHOOTING GUIDE - FIRING P.C. BOARD

1.All 10 LED’s must be ON when the POWER SOURCE is turned ON and the wire feeder’s trigger is closed, or a jumper is placed between 2 & 4, or the “OUTPUT TERMINALS SWITCH” is in the ON position.

2.LED’s 7, 8, and 9 indicate AC power being supplied to the P.C. board from auxiliary windings (T1). If a light is not on, turn the machine off and unplug P5 from the firing board. Turn the machine back on and check the fol- lowing voltages:

Light that was off

Check AC voltage between

Voltage should be approximately

7

P5 pins 15

& 16 (wires 230,204)

32VAC

8

P5 pins 7

& 8 (wires 205,206)

32VAC

 

9

P5 pins 5

& 6 (wires 207,208)

32VAC

3.If all voltages are present, turn power off, and plug P5 back into J5. Turn power back on. If LED’s are still out, replace firing PCB.

4.If voltages were not present then check the wiring back to the auxiliary windings for a possible open.

5.LED’s 1 through 6 indicate gate signals are being sent to the main SCR’s 1 through 6 respectively If LED5 is on (CONTROL BOARD), along with LED7, 8, and 9 on firing PCB, and LED’s 1 through 6 are not on, check to make sure lead 231 between control board and firing board is not broken.

6.If any one of LED 1 through 6 are not on and LED’s 7,8, and 9 are on, replace the firing PCB.

PC BOARD TROUBLESHOOTING GUIDE - CONTROL P.C. BOARD

1.

LED1

indicates that the CC mode switch is closed. When the CC mode switch closed LED6 should also illu-

 

 

minate. See LED6.

 

2.

LED2

indicates that there is feedback voltage present in CV mode.

3.

LED3

indicate an input shutdown. Refer to Remote Control Leads Fault Protection Shutdown and

 

 

Shorted Rectifier Fault Protection or Idle Shut Down Timer in the Operation section.

4.

LED4

indicates an over current fault shutdown.

Refer to Overcurrent Protection Shutdown in the

 

 

Operation Section.

 

5.

LED5

Indicates Output Current should be present.

 

6.

LED6

indicates that the machine is in CC mode.

This LED should light whenever LED1 lights. If not the

 

 

Control PC Board may be faulty.

 

7.

LED7

+16V power supply

 

8.

LED8

indicates the Control PC Board is signalling the Firing PC Board to fire the SCRs.

9.

LED9

-10V power supply

 

10.LED10 indicates that 42V input is present to the Control PC Board

11.LED11 indicates that there is feedback voltage present in CC mode.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

DC-655

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Contents DC-655 California Proposition 65 Warnings SafetyE C T R I C S H O C K c a n kill Iii Welding and Cutting Sparks can Cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéVSAFETY ViSAFETY Thank You Table of Contents Input Hertz Input Ampere Type 80C InstallationTechnical Specifications DC-655 Height Width Depth WeightNRTL/C Nrtl Input Power Three PhaseGmaw Fcaw Smaw SAWElectrical Input Connections Safety PrecautionsSelect Suitable Location Input Power Supply Connections Reconnect ProcedureLOW Inductance Terminal Output ConnectionsElectrode and Work Cables Table A.1Auxiliary Power Control Connections Terminal Strips Terminal Strip 1 T.S.1Terminal Strip 2 T.S.2 Recommended Processes and Equipment OperationGeneral Description General WarningsWelding Capability Design Features and AdvantagesOutput Terminals ON/REMOTE When this Controls and SettingsPower ON/OFF Switch This tog LOCAL/REMOTE Control Switch When thisFigure B.2 Lower Case Front Controls & Connections Machine Protection Welding Performance CC Mode ARC Force CV Mode CURRENT-LIMITINGCC Mode HOT Start CC Mode ARC GougingField Installed Options AccessoriesSEMI-AUTOMATIC Wire Feeders Automatic Wire FeedersAccessories Safety Precautions MaintenanceGeneral Maintenance HOW to USE Troubleshooting Guide TroubleshootingProblems Troubleshooting Trol circuit. #75, #76, #77 Problems Troubleshooting Troubleshooting Troubleshooting PC Board Troubleshooting Guide Control P.C. Board PC Board Troubleshooting Guide Firing P.C. Board10TROUBLESHOOTINGE-10 Negative Positive DiagramsGND Negative Positive Receptacle Convenience, this extended #21 lead should be taped to 655 Wiring Diagram for Codes 10501,10503, 10504 Diagrams Diagrams Diagrams Diagrams Aviso DE Keep your head out of fumes Turn power off before servicing