Lincoln Electric SVM157-A service manual Test for Supply Voltage to Tachometer

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Section TOC

Master TOC

F-17

TROUBLESHOOTING AND REPAIR

F-17

WIRE DRIVE MOTOR AND TACHOMETER FEEDBACK TEST

(continued)

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TOC

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5. Make the following voltage tests:

WARNING

ELECTRIC SHOCK can kill.

•Do not touch electrically live parts such as output terminals or internal wiring.

•All input power must be electri- cally disconnected before pro- ceeding.

a.Turn the machine OFF between each test.

2.Locate plug J4.

3.Locate the tach leads on plug J4. See

Figure F.5.

4.Connect the main input power to the machine.

5.Make the following voltage tests:

WARNING

ELECTRIC SHOCK can kill.

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b. Carefully insert the meter probes into the lead side of plug J4. See Figure

F.4.

c. Turn the machine ON and pull the gun trigger to conduct the voltage test.

FROM LEAD FROM LEAD FROM LEAD

Black

White

2-29 VDC

Armature

Armature

(varies depend-

Lead

Lead

ing on wire feed

speed)

6.If the voltage to the wire drive motor arma- ture is zero, check the wires between plug J4 and the wire drive motor. Also check the electrical connector J5 for proper con- nections and jumper plug. See the Wiring Diagram.

7.If all wires and connectors are good and the voltage to the drive motor armature is zero, the control PC board may be faulty. Replace the control PC board.

8.If the motor is running at high speed and the armature voltage is high and uncon- trollable, Proceed with the tachometer test.

TEST FOR SUPPLY VOLTAGE TO TACHOMETER

1.Disconnect the main AC input power to the machine.

•Do not touch electrically live parts such as output terminals or internal wiring.

•All input power must be electri- cally disconnected before pro- ceeding.

a.Turn the machine OFF between each test.

b.Carefully insert the meter probes into the lead side of plug J4.

FROM LEAD FROM LEAD FROM LEAD

Black (-)

Red (+)

5-6 VDC

6.If the 5-6 VDC is present, check the leads to the tachometer circuit.

7.If the leads are okay and 5-6 VDC is pre- sent, the correct voltage is being received from the control PC board. Continue with the supply voltage to tachometer test.

8.If the 5-6 VDC is not present and the leads are okay, the control PC board may be faulty, replace the control PC board. Also check plug J5 and the jumper plug. See Wiring Diagram.

POWER MIG 200

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Contents Safety Depends on You Power MIGCalifornia Proposition 65 Warnings SafetyARC Rays can burn Electric Shock can killIii Cylinder may explode if damagedSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Installation Section Table of ContentsTechnical Specifications Power MIG Installation3INSTALLATIONA-3 Figure A.1 Dual Voltage Machine Input Connections Figure A.2 Triple Voltage Machine Input Connections Output Polarity ConnectionsGUN and Cable Installation Shielding GASCylinder may explode if damaged Operation Section B Operation SectionWear eye, ear and body protec- tion OperationRecommended Processes and Equipment Wire Drive RollWire Size Conversion Parts Product DescriptionProcedure for Changing Drive and Idle Roll Sets Wire Reel Loading READI-REELS, Spools or CoilsTo Start the Welder Idle Roll Pressure Setting Feeding Wire Electrode Making a WeldInput Line Voltage Variations Avoiding Wire Feeding ProblemsWire Feed Overload Protection FAN ControlAccessories Section Dual Cylinder Mounting KIT K1702-1 AccessoriesDrive Roll Kits K363P READI-REEL AdapterAdapter KIT and Spool GUN InstalledPower MIG Maintenance Section Maintenance Overtightening will split or collapse the liner Cause poor wire feedingLiner Removal and REPLACE- Ment This screw should only be gently tightenedEnglish Metric Description Size GUN Handle DisassemblyMaintenance Power MIG Theory of Operation Section Line SwitchTheory of Operation Motor Control Board Output Rectification Contactor and Control BoardFigure E.4 Optional Circuits Control BOARD, GUN Trigger and Wire Drive MotorThermal and Overload Protection Wirefeed Overload ProtectionPower MIG Troubleshooting and Repair Section F Troubleshooting and Repair SectionHow To Use Troubleshooting Guide Troubleshooting and RepairPC Board Troubleshooting Procedures Perform the Main Transformer Perform the Output Contactor These capacitors is toxic Avoid contact with any portionYour body Function Problems Tachometer Feedback Test Welding Problems Weld bead is narrow or ropy Make sure the welding proce Main Transformer Test Test DescriptionMaterials Needed Main Transformer Test ON/OFF Power Switch will be hot during these testsX10 Input Voltage Test Points Table F.1. Test PointsWire Drive Motor and Tachometer Feedback Test Figure F.4. Plug J4 Test ProcedureTest for Supply Voltage to Tachometer Disconnect the main AC input power to the machineVDC Test for Feedback Voltage to Control BoardOutput Bridge Rectifier Test Output Bridge Rectifier Test Test ProcedureContactor Test Figure F.7. Contactor Terminals and Leads Contactor TestTypical Output Voltage Waveform Machine Loaded MAX TAP G Volts 10.0Normal Open Circuit Voltage Waveform MAX TAP G Volts 20.0Machine Loaded to 180 Amps AT 16 VDC Scope Settings Volts 20.0 Description Control Board ReplacementProcedure Control Board ReplacementWire Drive Motor Assembly Replacement Wire Drive Wire Drive Motor Assembly ReplacementBolt Gas Hose TOC Output Diode Bridge Rectifier Replacement Output Diode Bridge Rectifier Mounting Bracket Mounting Bolts Rectifier Power MIG Output Capacitors Replacement Figure F.14. Capacitor Bank Location Output Capacitors ReplacementLead Mounting Bolts Nuts & Lock washers Places Power MIG Main Transformer Replacement 41TROUBLESHOOTING and REPAIRF-41See Figure F.17 Main Transformer ReplacementFigure F.17. Leads X9, X10, 104B,104C, & H1B ReplacementX2 X3 X4 X5 X6 X7 Lead Power MIG FAN BLADE/MOTOR Replacement Perform the Output Capacitor Bank Removal Procedure FAN BLADE/MOTOR ReplacementOutput Contactor Replacement Figure F.24 Output Contactor ReplacementMounting Bolts Retest After Repair Table of Contents Electrical Diagrams Section Electrical DiagramsWiring Diagram Power MIG 200 208/230VSchematic Control PC Board G3851-1 PC Board ASSEMBLY-CONTROLSVM Error Reporting Form
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