Output Bridge Rectifier Test | Lincoln Electric SVM157-A guide

TOC

TOC

F-20

TROUBLESHOOTING AND REPAIR

F-20

OUTPUT BRIDGE RECTIFIER TEST (continued)

Return to Section

TOC

Return to Master

TOC

TEST PROCEDURE

1.Remove input power to the POWER MIG 200 machine.

2.Using the 3/8” nutdriver, remove the left case side.

3.Locate and disconnect the negative lead from the output rectifier bridge assembly. Be sure there is no electrical contact between the rectifier and the lead. See Figure F.6.

NOTE: Do not disassemble the rectifier assembly.

4.Test for “shorted” or “leaky” diodes by checking from the anodes to the cathodes of the diode heatsink plates. The readings should be high resistance in one polarity and low resistance in the opposite polarity.

5.If any of the diodes are “leaky” or “shorted” the output rectifier assembly should be replaced.

6.When the test is complete, replace the negative output lead previously removed.

7.Replace the left case side.

Return to Section

Return to Section TOC

Return to Section TOC

Return to Master

Return to Master TOC

Return to Master TOC

Figure F.6. Rectifier Test Points

+

-

Negative Lead

POWER MIG 200

Image 54

Lincoln Electric SVM157-A service manual Output Bridge Rectifier Test, Test Procedure

Contents

Power MIG Safety Depends on You Safety California Proposition 65 Warnings Electric Shock can kill ARC Rays can burn Cylinder may explode if damaged Iii Précautions DE Sûreté Sûreté Pour Soudage a L’Arc Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications Power MIG 3INSTALLATIONA-3 Figure A.1 Dual Voltage Machine Input Connections Output Polarity Connections Figure A.2 Triple Voltage Machine Input Connections GUN and Cable Installation Shielding GASCylinder may explode if damaged Operation Section Operation Section B Operation Wear eye, ear and body protec- tion Product Description Wire Drive RollWire Size Conversion Parts Recommended Processes and Equipment Procedure for Changing Drive and Idle Roll Sets Wire Reel Loading READI-REELS, Spools or CoilsTo Start the Welder Feeding Wire Electrode Making a Weld Idle Roll Pressure Setting FAN Control Avoiding Wire Feeding ProblemsWire Feed Overload Protection Input Line Voltage Variations Accessories Section K363P READI-REEL Adapter AccessoriesDrive Roll Kits Dual Cylinder Mounting KIT K1702-1 Installed Adapter KIT and Spool GUN Power MIG Maintenance Section Maintenance This screw should only be gently tightened Cause poor wire feedingLiner Removal and REPLACE- Ment Overtightening will split or collapse the liner GUN Handle Disassembly English Metric Description Size Maintenance Power MIG Line Switch Theory of Operation Section Theory of Operation Output Rectification Contactor and Control Board Motor Control Board Control BOARD, GUN Trigger and Wire Drive Motor Figure E.4 Optional Circuits Wirefeed Overload Protection Thermal and Overload Protection Power MIG Troubleshooting and Repair Section Troubleshooting and Repair Section F Troubleshooting and Repair How To Use Troubleshooting Guide PC 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 ON/OFF Power Switch will be hot during these tests Main Transformer Test X10 Table F.1. Test Points Input Voltage Test Points Wire Drive Motor and Tachometer Feedback Test Test Procedure Figure F.4. Plug J4 Disconnect the main AC input power to the machine Test for Supply Voltage to Tachometer Test for Feedback Voltage to Control Board VDC Output Bridge Rectifier Test Test Procedure Output Bridge Rectifier Test Contactor Test Contactor Test Figure F.7. Contactor Terminals and Leads Volts 10.0 Typical Output Voltage Waveform Machine Loaded MAX TAP G Volts 20.0 Normal Open Circuit Voltage Waveform MAX TAP G Machine Loaded to 180 Amps AT 16 VDC Scope Settings Volts 20.0 Control Board Replacement Description Control Board Replacement Procedure Wire Drive Motor Assembly Replacement Wire Drive Motor Assembly Replacement Wire Drive Bolt Gas Hose TOC Output Diode Bridge Rectifier Replacement Output Diode Bridge Rectifier Mounting Bracket Mounting Bolts Rectifier Power MIG Output Capacitors Replacement Output Capacitors Replacement Figure F.14. Capacitor Bank Location Lead Mounting Bolts Nuts & Lock washers Places Power MIG 41TROUBLESHOOTING and REPAIRF-41 Main Transformer Replacement Main Transformer Replacement See Figure F.17 Replacement Figure F.17. Leads X9, X10, 104B,104C, & H1B X2 X3 X4 X5 X6 X7 Lead Power MIG FAN BLADE/MOTOR Replacement FAN BLADE/MOTOR Replacement Perform the Output Capacitor Bank Removal Procedure Output Contactor Replacement Output Contactor Replacement Figure F.24 Mounting Bolts Retest After Repair Electrical Diagrams Table of Contents Electrical Diagrams Section Power MIG 200 208/230V Wiring Diagram Schematic Control PC Board PC Board ASSEMBLY-CONTROL G3851-1 SVM Error Reporting Form