Auxiliary Transformer Test | Lincoln Electric V250-S guide

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F-12	TROUBLESHOOTING & REPAIR	F-12
	TROUBLESHOOTING & REPAIR

AUXILIARY TRANSFORMER TEST (continued)

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TEST PROCEDURE

1.Remove main input power to the V250-S.

2.Perform Filter Capacitor Discharge Procedure detailed in Maintenance Section

3.Locate the Auxiliary Transformer just behind the input line switch on the lower right side of the machine.

4.Locate and disconnect plug J7 from the wiring harness.

5.Carefully apply the 230VAC isolated supply to leads H1(1J7) and H3(2J7) of the auxiliary transformer.

6.Carefully check for the presence of the following voltages at the appro- priate leads. See Table F.1.

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AUXILIARY TRANSFOMER

PLUG J7

1J7 2J7 3J7

4J7 5J7 6J7

Figure F.1 Auxiliary Transformer and Plug J7.

INVERTEC V250-S

Image 44

Lincoln Electric V250-S service manual Auxiliary Transformer Test, Test Procedure

Contents

Invertec V250-S Safety Fumes and Gases can be dangerous Electric Shock can killARC Rays can burn Cylinder may explode if damaged Welding Sparks can cause fire or explosion Précautions DE Sûreté Sûreté Pour Soudage a L’Arc Master Table of Contents for ALL Sections Installation Table of Contents Installation Section Three Phase Technical Specifications Invertec V250-SThree Phase Single Phase Select Suitable Location Safety PrecautionsInput Connections Power Input Connection for 50/60 HZ Machines Input Voltage Reconnect ProcedureInput Fuse and Supply Wire Remote Control Receptacle Output ConnectionsQuick Disconnect Plugs Output Cables Invertec V250-S Operation Safety Instructions Gouging Sparks Controls and Settings Figure B.1 Case Front Controls Constant Current Processes Manual ARC Welding StickAIR Carbon ARC Cutting TIG Welding Thermal Protection Parallel OperationOverload Protection Invertec V250-S Accessories Table of Contents Accessories Section Cable Plugs Options / AccessoriesRemote Controls Maintenance Table of Contents Maintenance Section Input Filter Capacitor Discharge Procedure Figure D.1 Location of Input Filter Capacitor Terminals Routine Maintenance Filter Capacitor Conditioning Figure D.2 Location of Maintenance Components Table of Contents Theory of Operation Section Theory of Operation General Description Input Line Voltage Precharge and Protection Figure E.2 Protection and PRE-CHARGE Circuits Main Transformer Figure E.3 Main Transformer Output Rectification Control Figure E.4 Output Rectification and Control Protection Circuits Overload Protection Insulated Gate Bipolar Transistor Igbt Operation Maximum Output Pulse Width ModulationMinimum Output Troubleshooting & Repair HOW to USE Troubleshooting Guide Oscilloscope Warning PC Board Troubleshooting Procedures Board can be dam- aged by static electricity Possible Areas Recommended Symptoms Course of Action Possible Areas Perform the Control Board Voltage Checks Capacitor Balance Test Troubleshooting & Repair Perform the Output Diode Test Welding Problems Invertec V250-S Materials Needed Auxiliary Transformer TestTest Description Test Procedure Auxiliary Transformer Test Auxiliary Transformer Test Table F.1 Auxiliary Transformer Test Points Invertec V250-S Input Rectifier Test Test Procedure Input Rectifier Test Table F.2 Input Rectifier Test Points Test Point Terminals Analog Meter X10 Range Invertec V250-S Power Board Resistance Test Power Board Resistance Test Test Description Power Board Resistance Test Table F.3 Power Board Resistance Test Points Invertec V250-S Output Diodes Test Output Diodes Test Figure F.4 Machine Output Terminals Invertec V250-S Diode Modules Power Board Voltage Test Power Board Voltage Test Figure F.8 Plug J6 on Power Board Test Conditions Table F.4. Power Board Voltage Test PointsAcceptable Test Description Invertec V250-S Control Board Voltage Test Control Board Voltage Test Figure F.9 Plugs J1-J5 on Control Board Table F.5. Control Board Voltage Test Points 18VAC Invertec V250-S Protection Circuit Test Protection Circuit Test Figure F.10 Control Board Plug J2 Test Points Protection Circuit Simplified Invertec V250-S Capacitor Balance Test Figure F.12 Power Board and Capacitor Test Locations Capacitor Balance Test Table F.6 Capacitor Voltages Invertec V250-S Control Board Removal and Replacement V250S Control Control Board Removal and ReplacementProcedure Power Board Removal and Replacement Power Board Removal and Replacement Figure F.14 Power Board Lead Locations Power Board Replacement Procedure Invertec V250-S Filter Capacitor Removal and Replacement Matched Parts Filter Capacitor Removal and Replacement Figure F.15 Heatsink/Power Board Removal Perform Power Board Replacement Procedure in this section Invertec V250-S Input Rectifier Bridge Removal and Replacement Input Rectifier Bridge Removal and Replacement Figure F.16 Input Rectifier Lead Locations Troubleshooting & Repair Invertec V250-S Materials Needed Snubber Resistors Locking Tabs Invertec V250-S Wrench Allen type wrench Torque wrench Mounting Bolts Diode Modules Bolted Connections Troubleshooting & Repair Invertec V250-S Main Transformer Removal and Replacement Machine Codes below T3 Current Transformer Main Transformer Main Transformer Secondary Leads Figure F.22 Main Transformer Mountings Clear all leads and secure for case wrap-around assembly Invertec V250-S Main Transformer Removal and Replacement Machine Codes Above Figure F.23 Main Transformer Right Side Figure F.24 Main Transformer Left Side Figure F.25 Main Transformer Mountings Troubleshooting & Repair Invertec V250-S Maximum Acceptable Output AT Minimum Output Settings Minimum Acceptable Output AT Maximum Output SettingsRetest After Repair Input Idle Amps and Idle Watts Invertec V250-S Electrical Diagrams Invertec V250-S Wiring Diagram Codes 10102 Invertec V250S Wiring Diagram Codes 10187 Return to Section Control PC Board G2666 Layout G2666 Power PC Board G2684 Layout Power P.C. BD. Asbly Control PC Board G2666 Schematic Relay Coils Power PC Board G2684 Schematic From Control BD