Lincoln Electric SVM123-A service manual Function Problems

Page 49

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F-9

TROUBLESHOOTING & REPAIR

F-9

 

 

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

 

 

 

 

PROBLEMS

POSSIBLE AREAS OF

 

RECOMMENDED

 

 

(SYMPTOMS)

MISADJUSTMENT(S)

 

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

FUNCTION PROBLEMS

 

 

 

 

 

 

Machine shuts off (input contac-

1. Remove all welding cables

1. Check for grounds and or

tor drops out) when the welder

and control cables from the

 

shorts in the #73, #74, #75,

output terminals are electrically

DC-1000. Jumper #2 to #4 at

 

#76, #77 circuit. See wiring

energized. (#2 to #4 closure at

the terminal strip. If the

 

diagram.

 

terminal strip.)

machine does NOT shut off

 

 

 

 

 

and normal open circuit volt-

2.

Check for grounds and shorts

 

 

age is present at the welder

 

in the welder output terminals

 

 

output terminals, the problem

 

and associated leads. See

 

 

is external to the DC-1000.

 

wiring diagram.

 

 

 

Either the remote leads #73,

 

 

 

 

 

#74, #75, #76 or #77 are

3.

Check the output shunt and

 

 

grounded to the negative out-

 

associated leads. See wiring

 

 

put cable, or there is a short

 

diagram.

 

 

 

on the welding output termi-

 

 

 

 

 

nals.

4. Perform the Control Board

 

 

 

 

Test.

 

 

 

2. If the machine still shuts off

 

 

 

 

 

when all control and welding

 

 

 

 

 

cables are removed, then the

 

 

 

 

 

problem is internal to the DC-

 

 

 

 

 

1000.

 

 

 

 

 

 

The DC-1000 will NOT shut off

1. Contact your local Lincoln

1. The input contactor (1CR)

when the Stop button is pushed.

Authorized Field Service

 

contacts may be stuck closed.

 

 

Facility.

 

Check and replace if neces-

 

 

 

 

sary.

 

 

 

 

2. The Interlock contacts (part of

 

 

 

 

1CR) may be faulty. Replace

 

 

 

 

if necessary.

 

 

 

 

3. The Start/Stop button may be

 

 

 

 

faulty. Check or replace.

 

 

 

 

 

 

CAUTION

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

IDEALARC DC-1000

Image 49
Contents Idealarc Electric and Magnetic Fields SafetyElectric Shock can kill Welding Sparks can cause fire or explosion Sûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Installation Output Technical Specifications Idealarc DCSelect Proper Location Electric Shock can KillElectrical Input Connections StackingFuse and Wire Sizes Reconnect ProcedureInput Power Supply Connections Ground ConnectionFigure A.3a Input Connection Diagram Figure A.3c -Input Connection Diagram Figure A.3d Input Supply Connection Diagram Output Connections Cutting Operation Connection for AIR/CARBON ARCIdealarc DC-1000 Operation Electric Shock can kill Safety InstructionsDesign Features Advantages Operational Features and ControlsGeneral Description Recommended Processes and EquipmentWelding Capability Return to Section Controls and SettingsRemote Control of Machine Operation Welding Procedure RecommendationsNA-3 Automatic Wire Feeder ARC Striking with Idealarc DC-1000 and the NA-3 Start Board Remote LN-8 SEMI-AUTOMATIC Wire FeederTable of Contents AccessoriesConnecting the NA-3 or LT-7 to OPTIONS/ACCESSORIESIdealarc DC-1000 Remote Output Control OptionalFigure C.2 NA-5 Wire Feeder Connection to Idealarc DC-1000 Connecting the NA-5 to the Idealarc DC-1000Connecting the LN-8 to the Idealarc DC-1000 Connecting the LN-9 Wire Feeder to the Idealarc DC-1000 Connecting the LN-7 Wire Feeder to the Idealarc DC-1000 Maintenance Routine and Periodic Maintenance Safety Precautions Electric Shock Can KillFigure D.1 Major Component Locations Idealarc DC-1000 Theory of Operation TOR, and Main Transformer Input Line VOLTAGE, ContacCONTROL, and Feedback Output RectificationCircuits Contactor HOLD-IN Protection DevicesFigure E.5 SCR Operation SCR OperationIdealarc DC-1000 Troubleshooting & Repair Locate Problem Symptom HOW to USE Troubleshooting GuideBoard can be damaged by static electricity PC Board Troubleshooting ProceduresControl Transformer Test Return Return to Master TOC Return Return to Section TOC Perform SCR Output Bridge Troubleshooting & Repair Function Problems Perform Firing Board Test Perform Control Board Test SCR Output Troubleshooting & Repair Control Transformer T2 Voltage Test Test DescriptionFigure F.1 Control Transformer Lead Location Test ProcedureFigure F.2 Control Transformer X1 and X2 Test Points Main Transformer T1 Voltage Test Test Description Figure F.4 Main Secondary Lead Test Points From Expected VAC Firing Board Test Test Procedure for Normal Firing Board Operation Figure F.7 Terminal Strip Jumper Wire Connections Figure F.8 Output Pilot Relay 4CR Location Then Table F.1 LED 7, 8 and 9 Check ListControl Board Test Figure F.9 Control Board LED and Pin Locations Test Procedure for Normal Control Board OperationIf LED 1 does not light, when the start switch is on Possible Problems Pertaining to the Control BoardFigure F.11 LED 2 Open Circuit Voltage Test Points If LED 4 lights Static SCR Test Figure F.12 Test ProcedureFigure F.13 SCR Heat Sink Assembly Test Points Static SCR Test Active SCR Test Active SCR Test Figure F.16 Heat Sink Assembly Test Points Battery Test Scope Settings Troubleshooting & Repair Troubleshooting & Repair Troubleshooting & Repair Troubleshooting & Repair Troubleshooting & Repair Troubleshooting & Repair Input Contactor 1CR Cleaning AND/OR Replacement Figure F.18 Input Contactor Cover Removal Cleaning ProcedureRemoval Contactor ReplacementInstallation SCR Output Bridge Replacement Figure F.22 Preparation For SCR Output Bridge Removal SCR Output Bridge RemovalFigure F.23 SCR Output Bridge Removal Removal of Individual SCR Heat Sink Assemblies SCR Output Bridge Installation SCR Heat Sink InstallationTOC Removal and Reassembly of Lift Bail Figure F.25 Lift Bail Removal Removal of Lift BailReassembly of Lift Bail Main Transformer Removal and Installation Figure F.26 Main Transformer Disassembly Main Transformer Disassembly and AssemblyCoil Removal Replacement Main Transformer DisassemblyTransformer Reassembly Transformer InstallationIdealarc DC-1000 Open Circuit Voltages Input Idle Amps and WattsIdealarc DC-1000 Electrical Diagrams Idealarc DC-1000 Wiring Diagram Codes 9919 Operating Schematic Control PC Board G1585 Layout Firing PC Board G1486-5 and above Layout Control PC Board G1585 Schematic Firing PC Board G1486-5 and above Schematic Output Snubber M14312 Schematic