Lincoln Electric V205-T service manual Figure F.5 Input Filter Board

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F-17

F-17

TROUBLESHOOTING & REPAIR

INPUT FILTER BOARD TEST (continued)

FIGURE F.5 INPUT FILTER BOARD

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Note 1: A varistor ZN1 is placed between the two power supply phases, so if an instantaneous voltage in excess of 275VAC appears on ter- minals RV1 & RV2, the varistor very rapidly becomes conductive and thus absorbing a current peak sufficient to limit the above said overvoltage; this way the varistor ZN1 pro- tects the other parts of the machine from energy-limited overvoltages. This process has no destructive effect on the component if the energy generated by the voltage peak is low, as in the case of atmospheric lightening strikes. However, if over-voltage is high and prolonged, the varistor cannot dissipate this high energy and fails. For example, the machine is improperly connected to 275VAC, or the over-voltage is caused by non stabilized power units of inadequate capacity.

Note 2: The radio noise suppression circuit has two purposes: to keep the machine’s radio fre- quency emisions within limits specified by standards and to ensure the machine’s immu- nity against the same type of problems caused any electronic devices connected to the same power supply source. The filter con- sists of a network of capacitors, some of which are grounded, and a toroidal inductor.

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V205-T AC/DC

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Contents Invertec V205-T AC/DC Safety Electric Shock can kill Cylinder may explode if damaged Sûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Table of Contents Installation Section Operating Temperature Range Storage Temperature Range InstallationStacking Select Suitable LocationTilting Environmental AreaInput Connections Reconnect Procedure230V Input Attachment Plug Installation115V Input Engine Driven GeneratorWork Cable Connection Output Connection for StickOutput and GAS Connection for TIG Welding Figure A.1 Shielding GAS Connection Remote Control ConnectionV205-T AC/DC Table of Contents Operation Section General Description Safety InstructionsWelding Capability LimitationsFigure B.1 Rear Control Panel Figure B.1Figure B.2 Controls and SettingsLocal/Remote push button Selects the welding Step DiagramTIG DC TIG AC Indicator Parameter Default SET UP MenuWelding Polarity Output LimitationsFigure B.5 Copper TIG Welding Steel TIG WeldingTips for AC TIG Welding Filler MaterialProtective GAS AC TIG Welding Quick Start UPDC TIG Welding Quick Start UP Accessories Table of ContentsCompatible Equipment Optional AccessoriesCable Plugs TIG Torch KitsTable of Contents Maintenance Routine Maintenance Safety PrecautionsInput Filter Capacitor Discharge Procedure Table of Contents Theory of Operation Section Input Board and BUS Board Theory of OperationGeneral Description Figure E.3 Main Igbt Inverter Board Main Igbt Inverter BoardOutput Module Transistor Board Main TransformerOutput Module and Clamping Board Superimposition BoardOutput Filter Board CONTROL/DISPLAY Board High Frequency HF BoardFigure E.6 Igbt Insulated Gate Bipolar Transistor Igbt OperationTable of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairElectric Shock can kill PC Board Troubleshooting ProceduresOutput Problems Function Problems Function Problems Secondary Power Board Test Welding Problems Figure F.1 External Diagnostics Troubleshooting & Repair External DiagnosticsFigure F.2 Troubleshooting & Repair Internal DiagnosticsLED Internal DiagnosticsV205-T AC/DC Description Input Filter Capacitor Discharge ProcedureDischarge Procedure Input Filter Capacitor Discharge ProcedureInput Filter Board Test Input Filter Board Figure F.5 Input Filter Board V205-T AC/DC Main Igbt Inverter Board LOW Voltage Test Main Board Table F.1 Test Points LEDFigure F.7 Main Igbt Inverter Board Location TP2 MF2CONTROL/DISPLAY Board Test Control/Display Board Figure F.9 CONTROL/DISPLAY Board Location CN2 CN7 CN1Table F.2 Plug CN1 Test Points CN1Table F.3 Plug CN2 Test Points Table F.4 Plug CN7 Test PointsBUS Board Test BUS Board Table F.6 Plug CN3 Test Points Table F.5 Plug CN2 Test PointsTable F.7 Plug CN4 Test Points Table F.8 Plug CN7 Test PointsCN4 CN2Main Inverter Board Upfr Section Test Table F.10 Voltage Checks with 115 VAC Applied to Machine Figure F.14 Upfr Location on Main BoardDD1 MF9 TP9 Gndpwr RL1V205-T AC/DC Output Filter Board Test Troubleshooting and RepairOutput Filter Board Figure F.18 Output Filter Board Plug CN1 Figure F.17 Output Filter Board Plug LocationV205-T AC/DC Secondary Power Board Test Secondary Power Board Table F.13 Voltage Checks with 115 VAC Applied to Machine Figure F.20 Secondary Power Board Test Point LocationsV205-T AC/DC Main Inverter Board Welding Logic and Inverter Section Test Figure F.21 Main Board Location Main Inverter BoardTable F.17 LED Check in Stick Mode Table F.15 Feedback Voltage SignalsTable F.14 LED Functions Table F.16 Voltage Checks with 115 VAC Applied to MachineTP14 TP15 TP16 TP19 TP31 CN4/1-2 Short Circuit Ohms CN5/1-2 MF15 VDS MF12 MF16 VDS Figure F.23 Main Board Lower Left TP9 Ground PowerV205-T AC/DC Input Filter Board Removal and Replacement Input Filter Board Removal and Replacement RV1 V205-T AC/DC Main Igbt Board Removal and Replacement Main Igbt Board Removal & Replacement CN2 CN1 V205-T AC/DC CONTROL/DISPLAY Board Removal and Replacement CONTROL/DISPLAY Board Removal & Replacement CN3 CN7V205-T AC/DC Output Filter Board Removal and Replacement Removal and Replacement Casefront Mounting Screws Phillips Head Screws CN1 CN2 Output Diodes Removal and Replacement Figure F.35 Output Diode Location Output DiodesOutput Transistor Removal and Replacement Output Transistor Removal and Replacement Plug CN1 5mm V205-T AC/DC Table of Contents Electrical Diagrams Section Electrical DiagramsWiring Diagram V205-T AC/DC Standard Diagram SVM Error Reporting Form