Lincoln Electric INVERTEC V350-PRO Service Manual
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Lincoln Electric INVERTEC V350-PRO Service Manual

Lincoln electric invertec v350-pro
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INVERTEC V350-PRO
Safety Depends on You
Lincoln arc welding and cutting
equipment is designed and built
with safety in mind. However,
your overall safety can be
increased by proper installation
. . . and thoughtful operation on
your part. DO NOT INSTALL,
OPERATE OR REPAIR THIS
EQUIPMENT WITHOUT READ-
ING THIS MANUAL AND THE
TAINED THROUGHOUT. And,
most importantly, think before
you act and be careful.
Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com
For use with machine code numbers 10873, 10874, 10876
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SERVICE MANUAL
• World's Leader in Welding and Cutting Products •
• Sales and Service through Subsidiaries and Distributors Worldwide •
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Copyright © 2002 Lincoln Global Inc.
SVM158-A
April, 2002

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  • Page 1 SVM158-A April, 2002 INVERTEC V350-PRO For use with machine code numbers 10873, 10874, 10876 Safety Depends on You Lincoln arc welding and cutting equipment is designed and built with safety in mind. However, your overall safety can be increased by proper installation .
  • Page 2 Miami, Florida 33135 or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available from the Lincoln Electric Company, 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199. BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES ARE PERFORMED ONLY BY QUALIFIED INDIVIDUALS.
  • Page 3 SAFETY ARC RAYS can burn. ELECTRIC SHOCK can kill. 3.a. The electrode and work (or ground) circuits 4.a. Use a shield with the proper filter and cover are electrically “hot” when the welder is on. plates to protect your eyes from sparks and Do not touch these “hot”...
  • Page 4 SAFETY WELDING SPARKS can CYLINDER may explode cause fire or explosion. if damaged. 6.a. Remove fire hazards from the welding area. 7.a. Use only compressed cylinders If this is not possible, cover them to prevent containing the correct shielding gas for the the welding sparks from starting a fire.
  • Page 5 SAFETY 6. Eloigner les matériaux inflammables ou les recouvrir afin de PRÉCAUTIONS DE SÛRETÉ prévenir tout risque d’incendie dû aux étincelles. Pour votre propre protection lire et observer toutes les instructions 7. Quand on ne soude pas, poser la pince à une endroit isolé de et les précautions de sûreté...
  • Page 6 MASTER TABLE OF CONTENTS FOR ALL SECTIONS Page Safety..............................i-iv Installation ..........................Section A Operation..........................Section B Accessories...........................Section C Maintenance .........................Section D Theory of Operation ......................Section E Troubleshooting and Repair....................Section F How to Use Troubleshooting Guide....................F-2 Troubleshooting Guide ........................F-4 Test Procedures ........................F-15 Replacement Procedures ......................F-51 Electrical Diagrams ......................Section G Parts Manual ........................P-401 Series V350-PRO...

  • Page 7: Table Of Contents

    SectionA-1 Section A-1 TABLE OF CONTENTS - INSTALLATION SECTION - Installation Technical Specifications ......................A-2 Safety Precautions........................A-3 Stacking ............................A-3 Tilting ............................A-3 Input Grounding Connections ....................A-3 Power Cord Connection ......................A-3 Connection of Wire Feeders....................A-3/A-4 Cobramatic Connection Instructions..................A-4 Parallel Operation ........................A-5 V350-PRO...

  • Page 8: Technical Specifications

    INSTALLATION TECHNICAL SPECIFICATIONS - INVERTEC V350-PRO INPUT AC VOLTAGE & DC OUTPUT Product Ordering Input AC Rated DC Output Output Weight Dimensions Open Name Information Voltage Amps/Volt Range with Cord HxWxD Circuit /Duty Cycle (continuous) Voltage K1728-5 Construction Construction (81.0 lbs.) 350A / 34V / 60% (36.7 kg.)

  • Page 9: Safety Precautions

    ---------------------------------------------------------------------- •Incorrect connection may result in equipment SELECT SUITABLE LOCATION damage. ----------------------------------------------------------------------- The Invertec V350-PRO will operate in harsh environ- BLACK GREEN ments. Even so, it is important that simple preventative WHITE OR BROWN measures are followed in order to assure long life and reliable operation.

  • Page 10: Cobramatic Connection Instructions

    INSTALLATION Cobramatic Connection Instructions LN-7 Connection Instructions A Cobramatic can only be used with the “Factory” & An LN-7 can only be used with the “Factory” & “Advanced Process” versions of the 350-Pro. “Advanced Process” versions of the 350-Pro. • Turn the Invertec power switch "off" •...

  • Page 11: Parallel Operation

    INSTALLATION PARALLEL OPERATION The V350-Pro can be paralleled in CC mode. For best results, the currents of each machine should be rea- sonably well shared. As an example, with two machines set up in parallel for a 400 amp procedure, each machine should be set to deliver approximately 200 amps, not 300 amps from one and 100 amps from the other.
  • Page 12 NOTES V350-PRO...

  • Page 13: Table Of Contents

    Section B-1 Section B-1 TABLE OF CONTENTS - OPERATION SECTION - Operation..........................Section B Safety Precautions........................B-2 General Description......................B-2 Duty Cycle ..........................B-2 Operational Features and Controls ....................B-2 Weld Mode Select........................B-3 CC-Stick Soft........................B-3 CC-Stick Crisp........................B-3 TIG GTAW ........................B-4 CV-Wire ...........................B-4 CV-Innersheild.........................B-4 Advanced Process Panel......................B-5 Controls ............................B-6 Electrode Material........................B-6 Hot Start &...
  • Page 14 "Hold" period. • Output adjustment while in the "hold" period results in the "prior to operation" characteristics stated The Invertec V350-Pro offers multi-process CV, CC, above. and DC welding and is rated 350 amps, 34 volts at a 60% duty cycle.

  • Page 15: Weld Mode Select

    OPERATION • The unit will power up in "pre-determined preferred" 7. WELD MODE SELECT - FACTORY AND trigger modes. CONSTRUCTION (See Figure B.1) The Mode Control button selects from the following STICK = ON welding modes. CV = REMOTE TIG = REMOTE if remote output controls are attached CC-STICK SOFT: The Stick Soft process features con- to the machine.

  • Page 16: Tig Gtaw

    OPERATION CV-WIRE: The CV-WIRE mode features continuous • The Arc Control regulates the Arc Force to adjust the control from 10 to 40 volts. The mode was intended for short circuit current. The minimum setting (-10) will most GMAW, FCAW, and MCAW applications. produce a "soft"...

  • Page 17: Advanced Process Panel

    OPERATION • Pulsed Modes 7A. ADVANCED PROCESS PANEL In Pulse Modes; (See Figure B.2) The work point will be in the Amps window and To program Welding modes. SELECT knob is used to should be set close to the wire feed speed of the Scroll through all Welding modes.

  • Page 18: Controls

    OPERATION CONTROLS: 5. After all adjustments have been made press and (See Figure B.2.) hold the Memory button until the display changes. The right and the left window will display what The MEMORY button and SELECT knob are used memory to save in, lets say M1. To store in M1 push together to select a welding process and store it in the Memory button again to save the Pulse Mig memory (M1 thru M8).

  • Page 19: Weld Mode Details

    OPERATION WELD MODE DETAILS: Mode Range Comments Stick Soft 5 - 425 amps The stick soft mode is the best selection for general stick applications. Arc Control = Arc Force Hot Start = Initial hot start current (min = start a match set amps, Max. = greatest hot start current) During hot start, arc force is set at high and is fast response.

  • Page 20: Pulse Programs

    OPERATION PULSE PROGRAMS: MODE Range (IPM*) COMMENTS .030 Steel 65 - 1200 The V350 pulse programs are non-synergic and allow independent .035 Steel 55 - 800 control of the wire feed speed (at the wire feeder) and the arc .045 Steel 50 - 700 length.

  • Page 21: Lower Case Front

    20mA. nector if a remote is connected. If no remote is con- • 0 volts supplied to 76 will set the Invertec V350-Pro nected to the 14-pin MS-style connector then the to minimum output for the mode that has been...

  • Page 22: Auxiliary Power

    AUXILIARY POWER • 115VAC, 42VAC and 24VAC power is available from the 14-pin MS-style connector. The Construction model of the Invertec V350-Pro does not have the 14-pin MS-style connector) These supplies are intended to supply power for auxiliary equipment like wire feeders and the TIG Module.
  • Page 23 B-11 B-11 OPERATION SPECIAL WELDING PROCESSES • For steel, use 75/25 Ar/CO2 shield gas. AVAILABLE ON THIS MACHINE • For Stainless, select a Helium blend Tri-Mix. POWER MODE™ • For Aluminum, use 100% Ar. The Power Mode™ process was developed by Lincoln Start by setting the wire feed speed based upon mate- to maintain a stable and smooth arc at low procedure rial thickness and appropriate travel speed.
  • Page 24 B-12 B-12 OPERATION PULSE WELDING (GMAW-P) Pulsed MIG is an advanced form of welding that takes the best of all the other forms of transfer while minimiz- The pulsed-arc process is, by definition, a spray trans- ing or eliminating their disadvantages. Unlike short cir- fer process wherein spray transfer occurs in pulses at cuit, pulsed MIG does not create spatter or run the risk regularly spaced intervals.
  • Page 25 BENEFITS OF PULSE ON PULSE FROM Such pulses are shown in the figure below. After a number "N" of such pulses, depending on the wire feed LINCOLN ELECTRIC speed used, an identical number "N" of low energy pulses are performed. These low energy pulses, •...
  • Page 26 B-14 B-14 NOTES V350-PRO...
  • Page 27 Cobramatic & Tig Module Connection Instructions ..............C-2 Options/Accessories........................C-2 Quick Disconnect Plugs ......................C-3 Connection of Lincoln Electric Wire Feeders............C-4 Thru C-11 V350-PRO/LN-25 with Optional 6 Pin K441-1 Remote............C-4 V350-PRO/LN-25 with Optional 6 Pin K857 Remote ............C-5 LN-25 with K431 Remote Option..................C-6 V350-PRO/LN-25 with K867 Adapter ..................C-7...
  • Page 28 ACCESSORIES "CE" Version – K1728-3 Cobramatic Connection Instructions A Cobramatic can only be used with a Factory or • The "CE" version is the Factory version with the "CE" version of the V350 addition of power line filtering allowing the machine 1.
  • Page 29 ACCESSORIES QUICK DISCONNECT PLUGS A quick disconnect system is used for the welding cable connections. The K852-70 is designed to accept a welding cable size of 1/0 to 2/0. 1. Remove 25mm (1 in.) of welding cable insulation. 2. Slide rubber boot onto cable end. The boot end may be trimmed to match the cable diameter.
  • Page 30 ACCESSORIES CONNECTION OF LINCOLN ELEC- 4. Set the voltmeter switch to the electrode polarity TRIC WIRE FEEDERS chosen. 5. Set “CONTROL SELECT” to “REMOTE”. CONNECTION OF THE LN-25 TO THE V350-PRO “ACROSS THE ARC” WITH 6. Set the “MODE” to the “CV-WIRE” position. OPTIONAL 6 PIN K441-1 REMOTE CON- TROL.
  • Page 31 ACCESSORIES CONNECTION OF THE LN-25 TO THE 5. Set the voltmeter switch to the electrode polarity chosen. V350-PRO “ACROSS THE ARC” WITH OPTIONAL 6 PIN K857 REMOTE CON- 6. Set “CONTROL SELECT” to “REMOTE”. TROL. 7. Set the “MODE” to the “CV-WIRE” position. 1.
  • Page 32 ACCESSORIES 6. Set the “MODE” to the “CV-WIRE” position. CONNECTION OF THE LN-25 WITH K431 REMOTE OPTION TO THE V350-PRO. 7. Set “WELD TERMINALS SELECT” to the NOTE: AN LN-25 CAN ONLY BE USED WITH A FAC- “REMOTE” position. TORY OR “CE” VERSION OF THE V350-PRO. 8.
  • Page 33 ACCESSORIES CONNECTION OF THE K867 ADAPTER WITH LN-25 WITH K431 OPTION/V350-PRO. 1. Insulate each unused lead individually. 2. Remove 6 pin plug from K432 cable in order to connect K867 adapter. 3. Label each lead (A thru F) as they are removed from the 6 pin plug.
  • Page 34 ACCESSORIES CONNECTION OF THE LN-7 TO THE V350- 3. Connect the input cable from the K480 control cable to the (115VAC) 14 pin amphenol on the PRO USING K480 CONTROL CABLE (SEE V350-PRO and the input cable plug on the LN-7. FIGURE C.5) NOTE: AN LN-7 CAN ONLY BE USED WITH A FAC- 4.
  • Page 35 ACCESSORIES CONNECTION OF THE K867 ADAPTER FOR USE WITH THE K291 OR K404 INPUT CABLES AND LN-7. 1. Insulate each unused lead individually. 2. Splice leads and insulate. Figure C.6 Connection of LN-7 to V350-PRO using K867 adapter. S P A R E S P A R E L N - 7 L N - 7...
  • Page 36 C-10 C-10 ACCESSORIES CONNECTION OF THE LN-742 TO THE 3. Connect the K591 control cable to the 24/42VAC 14 pin amphenol on the back of the V350-PRO V350-PRO (SEE FIGURE C.7) and the input cable plug on the LN-742. NOTE: AN LN-7 CAN ONLY BE USED WITH A FAC- TORY OR “CE”...
  • Page 37 C-11 C-11 ACCESSORIES CONNECTION OF THE LN-10 TO THE 8. Set the “ARC CONTROL” to the “0” position and V350-PRO USING THE K1505 CONTROL then adjust to suit. CABLE. NOTE: AN LN-10 CAN ONLY BE USED WITH A FAC- 9. Set wire feed speed and voltage at the LN-10. TORY OR “CE”...
  • Page 38 C-12 C-12 NOTES V350-PRO...
  • Page 39 Section D-1 Section D-1 TABLE OF CONTENTS -MAINTENANCE- Maintenance .........................Section D Capacitor Discharge Procedure ....................D-2 Visual Inspection.........................D-2 Routine Maintenance........................D-2 Periodic Maintenance .........................D-2 Major Component Locations .....................D-3 V350-PRO...
  • Page 40 MAINTENANCE VISUAL INSPECTION WARNING Clean interior of machine with a low pressure air stream. Make a thorough inspection of all compo- Have qualified personnel do the maintenance nents. Look for signs of overheating, broken leads or work. Always use the greatest care when other obvious problems.
  • Page 41 MAINTENANCE FIGURE D.1 – MAJOR COMPONENT LOCATIONS 1. Center Panel 2. Base Assembly 3. Case Back 4. Case Front 5. Case Wraparound L T S TI C K 70 TI C TI G K 60 G TA C V- W IR C V- W AR -1 0...
  • Page 42 NOTES V350-PRO...
  • Page 43 Section E-1 Section E-1 TABLE OF CONTENTS -THEORY OF OPERATION SECTION- Theory of Operation ......................Section E General Description ........................E-2 Input Line Voltage, Auxiliary Transformer and Precharge............E-2 Switch Board and Main Transformer ..................E-3 Power board, Control Board, and SPI Communications............E-4 Output Rectifier and Choke ......................E-5 Thermal Protection ........................E-6 Protection Circuits ........................E-6 Over current Protection ......................E-6...

  • Page 44: Theory Of Operation

    A voltage to frequency converter circuit located on the switch board monitors the The Invertec V350-Pro can be connected for a variety capacitor voltages. This signal is coupled to the con- of three-phase or single-phase input voltages. The ini-...
  • Page 45 5KHZ. When the input capacitors are fully charged they act The Invertec V350-Pro has a F.A.N. fan as needed cir- as power supplies for the IGBT switching circuits. cuit. The fan operates when the welding output ter-...
  • Page 46 THEORY OF OPERATION FIGURE E.4 – POWER BOARD, CONTROL BOARD AND SERIAL PERIPHERAL INTERFACE (SPI) COMMUNICATIONS To Control Main Switch Board Board Positive Input Output Primary Input switch Rectifier Terminal Current Sensor Choke Negative Reconnect Output Terminal Switch Primary Current Sensor Primary Current Feedback 115VAC Fan Supply...
  • Page 47 THEORY OF OPERATION FIGURE E.5 – OUTPUT RECTIFIER AND CHOKE To Control Main Switch Board Board Positive Input Output Primary Input switch Rectifier Terminal Current Sensor Choke Negative Reconnect Output Terminal Switch Primary Current Sensor Primary Current Feedback 115VAC Fan Supply Input Relay Control Auxiliary Soft Start Control...
  • Page 48 THEORY OF OPERATION THERMAL PROTECTION OVER CURRENT PROTECTION Two normally closed (NC) thermostats protect the machine from excessive operating temperatures. If the average current exceeds 450 amps for one sec- These thermostats are wired in series and are con- ond, then the output will be limited to 100 amps until nected to the control board.
  • Page 49 THEORY OF OPERATION INSULATED GATE BIPOLAR capable of conducting current. A voltage supply con- nected to the drain terminal will allow the IGBT to con- TRANSISTOR (IGBT) duct and supply current to the circuit components OPERATION coupled to the source. Current will flow through the conducting IGBT to downstream components as long as the positive gate signal is present.
  • Page 50 THEORY OF OPERATION FIGURE E.7 — TYPICAL IGBT OUTPUTS. MINIMUM OUTPUT MAXIMUM OUTPUT PULSE WIDTH MAXIMUM OUTPUT MODULATION By holding the gate signal on for 24 microseconds each, and allowing only two microseconds of dwell The term Pulse Width Modulation is used to describe time (off time) during the 50-microsecond cycle, the how much time is devoted to conduction in the posi- output is maximized.
  • Page 51 Section F-1 Section F-1 TABLE OF CONTENTS TROUBLESHOOTING & REPAIR SECTION Troubleshooting & Repair Section .................Section F How to Use Troubleshooting Guide ..................F-2 PC Board Troubleshooting Procedures and Replacement ..........F-3 Troubleshooting Guide ......................F-4 Test Procedures Input Filter Capacitor Discharge Procedure ..............F-15 Main Switch Board Test ....................F-17 Input Rectifier Test ......................F-21 Power Board Test......................F-25...
  • Page 52 HOW TO USE TROUBLESHOOTING GUIDE CAUTION Service and repair should be performed by only Lincoln Electric Factory Trained Personnel. Unauthorized repairs performed on this equipment may result in danger to the technician and machine operator and will invalidate your factory warranty. For your safety and to avoid Electrical Shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 53 Do not touch electrically hot parts. - If you return a PC board to The Lincoln Electric Company for credit, it must be in the static-shielding bag. This will prevent further damage and allow prop- CAUTION er failure analysis.
  • Page 54 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353(WELD). V350-PRO...
  • Page 55 6. The control board may be faulty. faulty. CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353(WELD). V350-PRO...
  • Page 56 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353(WELD). V350-PRO...
  • Page 57 3. The control board may be faulty. CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353(WELD). V350-PRO...
  • Page 58 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353(WELD). V350-PRO...
  • Page 59 TROUBLESHOOTING & REPAIR DESCRIPTION/ CORRECTIVE SERVICE FACILITY FAULT CODES CORRECTIVE DEFINITION ACTION ACTION Main transformer Perform the Main Switch Turn the machine off and Board Test. primary over current back on to reset the machine. If condition Perform the Power persists, contact an Board Test.
  • Page 60 F-10 F-10 TROUBLESHOOTING & REPAIR DESCRIPTION/ CORRECTIVE SERVICE FACILITY FAULT CODES CORRECTIVE DEFINITION ACTION ACTION There may be a problem Capacitor bank Make sure the reconnect "B"(upper) is under with the V/F signals from switches are configured the main switch board to voltage.
  • Page 61 F-11 F-11 TROUBLESHOOTING & REPAIR DESCRIPTION/ CORRECTIVE SERVICE FACILITY FAULT CODES CORRECTIVE DEFINITION ACTION ACTION There may be a problem Capacitor bank Make sure the reconnect "B"(lower) is over with the V/F signals from switches are configured the main switch board to voltage.
  • Page 62 F-12 F-12 TROUBLESHOOTING & REPAIR DESCRIPTION/ CORRECTIVE SERVICE FACILITY FAULT CODES CORRECTIVE DEFINITION ACTION ACTION Perform the Main Switch Electrical "glitch" on the Possibly caused by an Board Test. primary over current fault external electrical detector circuit. "noise" or signal level. Perform the Power Make sure the V350-Pro Board Test.
  • Page 63 F-13 F-13 TROUBLESHOOTING & REPAIR DESCRIPTION/ CORRECTIVE SERVICE FACILITY FAULT CODES CORRECTIVE DEFINITION ACTION ACTION There may be a problem Electrical "glitch" on the Possibly caused by an with the V/F signals from V/F signals from the main external electrical switch board to the the main switch board to "noise"...
  • Page 64 F-14 F-14 NOTES V350-PRO...
  • Page 65 INPUT FILTER CAPACITOR DISCHARGE PROCEDURE WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 66 F-16 F-16 TROUBLESHOOTING & REPAIR INPUT FILTER CAPACITOR DISCHARGE PROCEDURE (continued) 4. Obtain a high resistance and high wattage resistor WARNING (25-1000 ohms and 25 watts minimum). This resistor is not with the machine. NEVER USE A ELECTRIC SHOCK SHORTING STRAP FOR THIS PROCEDURE. can kill.
  • Page 67 MAIN SWITCH BOARD TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 68 F-18 F-18 TROUBLESHOOTING & REPAIR MAIN SWITCH BOARD TEST (continued) FIGURE F.2 MAIN SWITCH BOARD LEAD LOCATIONS TEST PROCEDURE 4. Using a 7/16” wrench locate, label and remove 1. Remove input power to the V350-PRO. leads 201, 202, 203, 204, 205, 206, 207 and 2.
  • Page 69 F-19 F-19 TROUBLESHOOTING & REPAIR MAIN SWITCH BOARD TEST (continued) 6. If any test fails replace the switch board. See 8. Reconnect leads 201, 202, 203, 204, 205, 206, Main Switch Board Removal and Replacement. 207, and 208 to the switch board. Ensure that the leads are installed in their proper locations.
  • Page 70 F-20 F-20 NOTES V350-PRO...
  • Page 71 INPUT RECTIFIER TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 72 F-22 F-22 TROUBLESHOOTING & REPAIR INPUT RECTIFIER TEST (CONTINUED) TEST PROCEDURE 6. Using a phillips head screwdriver, 1. Remove input power to the V350-PRO remove leads 207, 207A, and 209 from machine. the input rectifier. 2. Using a 5/16” nut driver, remove the case 7.
  • Page 73 F-23 F-23 TROUBLESHOOTING & REPAIR INPUT RECTIFIER TEST (CONTINUED) Table F.2 Input Rectifier Test Points ANALOG METER TEST POINT TERMINALS X10 RANGE + PROBE Acceptable Meter Readings - PROBE Greater than 1000 ohms Greater than 1000 ohms Greater than 1000 ohms 207A Greater than 1000 ohms 207A...
  • Page 74 F-24 F-24 NOTES V350-PRO...
  • Page 75 POWER BOARD TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 76 F-26 F-26 TROUBLESHOOTING & REPAIR POWER BOARD TEST (CONTINUED) TEST PROCEDURE 7. If the 40VDC is low, or not present at plug 1. Remove input power to the V350-PRO J41, check the rectifier bridge and C5 filter machine. capacitor. See Wiring Diagram. Also per- 2.
  • Page 77 F-27 F-27 TROUBLESHOOTING & REPAIR POWER BOARD TEST (CONTINUED) Table F.3 Power Board Voltage Checks NORMAL ACCEPTABLE CHECK POINT TEST CONNECTOR LEAD NO. VOLTAGE LOCATION DESCRIPTION PLUG PIN NO. OR IDENTITY READING POWER PC CHECK 40VDC 2(+) 1(-) BOARD SUPPLY FROM 65 (+) 38-42 VDC CONNECTOR...
  • Page 78 F-28 F-28 NOTES V350-PRO...
  • Page 79 OUTPUT DIODE MODULES TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 80 F-30 F-30 TROUBLESHOOTING & REPAIR OUTPUT DIODE MODULES TEST (continued) FIGURE F.5 Machine Output Terminals OLTS CONTROL WELD TERMINALS REMOTE REMOTE REMOTE REMOTE LOCAL LOCAL OUTPUT SELECT SELECT MEMOR MEMORY BUTT BUTTON SELECT SELECT ATTRIBUTE TTRIBUTE SELECT SELECT KNOB KNOB ADJUST ADJUST ATTRIBUTE TTRIBUTE...
  • Page 81 F-31 F-31 TROUBLESHOOTING & REPAIR OUTPUT DIODE MODULES TEST (continued) Figure F.6 Terminal Probes 5. If 200 ohms is measured then the output NOTE: This may require the disassembly of diodes are not “shorted”. the leads and the snubber board from the diode modules.
  • Page 82 F-32 F-32 TROUBLESHOOTING & REPAIR OUTPUT DIODE MODULES TEST (continued) Figure F.7 Snubber and Output Diode Locations Output Diode Modules Snubber Board LEFT SIDE V350-PRO...
  • Page 83 AUXILIARY TRANSFORMER TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 84 F-34 F-34 TROUBLESHOOTING & REPAIR AUXILIARY TRANSFORMER TEST (continued) FIGURE F.8 Auxiliary Transformer Auxiliary Transformer Secondary Lead Plugs P52 L T S -S TI -S TI TI G G TA A LS C V- W IR C V- R ED W AR -1 0 IS P...
  • Page 85 F-35 F-35 TROUBLESHOOTING & REPAIR AUXILIARY TRANSFORMER NO.1 TEST (continued) TABLE F.4 LEAD IDENTIFICATION NORMAL EXPECTED VOLTAGE 31 TO 532 115 VAC 42 TO 541 42 VAC 24 TO 541 24 VAC 54 TO 541 28 VAC 7. Carefully apply the correct input voltage to the WARNING V350-PRO and check for the correct sec- High voltage is present at primary of...
  • Page 86 F-36 F-36 NOTES V350-PRO...
  • Page 87 CURRENT TRANSDUCER TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 88 F-38 F-38 TROUBLESHOOTING AND REPAIR CURRENT TRANSDUCER TEST (continued) FIGURE F.10 Metal Plate Removal & Plug J8 Location L T S -S T IC K -S T IC K T IG G TA IR E -F LU -1 0 IS P O FF Plug J8 TEST PROCEDURE...
  • Page 89 F-39 F-39 TROUBLESHOOTING AND REPAIR CURRENT TRANSDUCER TEST (continued) TABLE F.5 EXPECTED TRANSDUCER FEEDBACK OUTPUT LOAD CURRENT VOLTAGE 8. Check the feedback voltage from the current 9. If for any reason the machine cannot be transducer using a resistive load bank and loaded to 300 amps, Table F.5.
  • Page 90 F-40 F-40 NOTES V350-PRO...
  • Page 91 FAN CONTROL AND MOTOR TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 92 F-42 F-42 TROUBLESHOOTING AND REPAIR FAN CONTROL AND MOTOR TEST (continued) TEST PROCEDURE 3. Perform the Input Filter Capacitor Discharge 1. Remove the input power to the V350-PRO Procedure. machine. 4. Locate plug J22 on the main switch board. Do 2.
  • Page 93 F-43 F-43 TROUBLESHOOTING AND REPAIR FAN CONTROL AND MOTOR TEST (continued) 7. If the 115VAC is low or not present check cir- FAN CONTROL TEST PROCEDURE cuit breaker CB2 located on the front panel. If 1. Locate plug J20 on the switch board. Do not the circuit breaker is OK, perform The remove the plug from the switch board.
  • Page 94 F-44 F-44 NOTES V350-PRO...
  • Page 95 SPI CABLE RESISTANCE AND VOLTAGE TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 96 F-46 F-46 TROUBLESHOOTING AND REPAIR SPI CABLE RESISTANCE AND VOLTAGE TEST (continued) TEST PROCEDURE 8. Reconnect the plug into the control board and perform the Display Board Replacement 1. Remove the input power to the V350-PRO. Procedure. 2. Using the 5/16” nut driver, remove the case 9.
  • Page 97 VOLTAGE AND CURRENT CALIBRATION PROCEDURE WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 98 F-48 F-48 TROUBLESHOOTING AND REPAIR VOLTAGE AND CURRENT CALIBRATION PROCEDURE (continued) CALIBRATION CHECK VOLTAGE CALIBRATION The calibration of the V350-PRO can be checked 1. Connect the resistive load band (approximate- using a resistive load bank with the V350-PRO in ly .087 ohms) and test voltmeter to the welding mode 200.
  • Page 99 F-49 F-49 TROUBLESHOOTING AND REPAIR VOLTAGE AND CURRENT CALIBRATION PROCEDURE (continued) CURRENT CALIBRATION PROCEDURE 1. Connect the resistive load band (approxi- 10. Adjust the Output Control knob again if mately .087 ohms) and test ammeter to the necessary to make the actual output cur- welding output terminals.
  • Page 100 F-50 F-50 NOTES V350-PRO...
  • Page 101 CONTROL BOARD REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 102 F-52 F-52 TROUBLESHOOTING & REPAIR CONTROL BOARD REMOVAL AND REPLACEMENT (continued) FIGURE F.16 - CONTROL BOARD LOCATION LT S TI C K 70 TI C TI G K 60 G TA A LS C V- W IR C V- R ED W AR M OT -1 0...
  • Page 103 F-53 F-53 TROUBLESHOOTING & REPAIR CONTROL BOARD REMOVAL AND REPLACEMENT (continued) FIGURE F.18. - CONTROL BOARD ALL PLUG LOCATIONS L T S J10B -S T IC K -S T IC K T IG IN A IR E -F L J10A -1 0 IS P 8.
  • Page 104 F-54 F-54 TROUBLESHOOTING & REPAIR CONTROL BOARD REMOVAL AND REPLACEMENT (continued) 12. Using a 3/8” nut driver remove the two mounting 14. Replace the control board. nuts from the top two corners of the control board. See Figure F.19. 13. Cut any necessary cable ties. FIGURE F.19 CONTROL BOARD MOUNTING SCREW LOCATION Mounting Nuts (3/8")
  • Page 105 DISPLAY BOARD REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 106 F-56 F-56 TROUBLESHOOTING & REPAIR DISPLAY BOARD REMOVAL & REPLACEMENT (continued) FIGURE F.20. – DISPLAY BOARD LOCATION Display Board Mode Board or Advanced L 11 7 -2 Process Board S TA 11 10 L T S T IC T IC T IG G TA -F L...
  • Page 107 F-57 F-57 TROUBLESHOOTING & REPAIR DISPLAY BOARD REMOVAL & REPLACEMENT (continued) FIGURE F.21. – CASE FRONT SCREW LOCATION OLTS CONTROL WELD TERMINALS REMOTE REMOTE LOCAL OUTPUT SELECT SELECT SELECT ATTRIBUTE MEMORY BUTTON SELECT KNOB ADJUST ATTRIBUTE Flathead Screws Phillips Head Screws 5/16"...
  • Page 108 F-58 F-58 TROUBLESHOOTING & REPAIR DISPLAY BOARD REMOVAL & REPLACEMENT (continued) 10. Remove plug J37 from the display board. See the \15. Replace the four phillips head screws removed Wiring Diagram. from the front of the machine located around the two welder output terminals.
  • Page 109 MAIN SWITCH BOARD REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 110 F-60 F-60 TROUBLESHOOTING & REPAIR MAIN SWITCH BOARD REMOVAL & REPLACEMENT (continued) FIGURE F.22. – MAIN SWITCH BOARD LEAD LOCATIONS PROCEDURE 1. Remove the input power to the V350-PRO. 5. Using a 5/16” and 3/8” nut driver remove the input lead shield from the area at the bottom of 2.
  • Page 111 F-61 F-61 TROUBLESHOOTING & REPAIR MAIN SWITCH BOARD REMOVAL & REPLACEMENT (continued) FIGURE F.23. – 3/16” ALLEN BOLT LOCATION 3/16" ALLEN BOLTS 9. Using a 3/16” allen wrench remove four allen 13. Replace the four allen bolts and washers bolts and washers as shown in Figure F.23. previously removed.
  • Page 112 F-62 F-62 NOTES V350-PRO...
  • Page 113 REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 114 F-64 F-64 TROUBLESHOOTING & REPAIR ADVANCED PROCESS PANEL REMOVAL AND REPLACEMENT (continued) FIGURE F.25. – MODE BOARD LOCATION Display Board Mode Board or Advanced L 11 7 -2 Process Board S TA 11 10 L T S T IC T IC T IG G TA -F L...
  • Page 115 F-65 F-65 TROUBLESHOOTING & REPAIR ADVANCED PROCESS PANEL REMOVAL AND REPLACEMENT (continued) FIGURE F.26. – CASE FRONT SCREW REMOVAL OLTS CONTROL WELD TERMINALS REMOTE REMOTE REMOTE REMOTE LOCAL LOCAL OUTPUT SELECT SELECT SELECT SELECT ATTRIBUTE TTRIBUTE MEMOR MEMORY BUTT BUTTON SELECT SELECT KNOB KNOB...
  • Page 116 F-66 F-66 TROUBLESHOOTING & REPAIR ADVANCED PROCESS PANEL REMOVAL AND REPLACEMENT (continued) FIGURE F.27.. – CASE FRONT OLTS CONTROL WELD TERMINALS REMOTE REMOTE LOCAL OUTPUT SELECT SELECT 5/16" Screws MEMOR MEMORY BUTT BUTTON SELECT SELECT ATTRIBUTE TTRIBUTE SELECT SELECT KNOB KNOB ADJUST ADJUST ATTRIBUTE...
  • Page 117 F-67 F-67 TROUBLESHOOTING & REPAIR ADVANCED PROCESS PANEL REMOVAL AND REPLACEMENT (continued) FIGURE F.28. – SCREW IN CAP Small Flathead Screwdriver 18. Replace the Advanced Process board. 25. Replace the four phillips head screws removed from the front of the machine located around 19.
  • Page 118 F-68 F-68 NOTES V350-PRO...
  • Page 119 REMOTE BOARD REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 120 F-70 F-70 TROUBLESHOOTING & REPAIR REMOTE BOARD REMOVAL AND REPLACEMENT (continued) PROCEDURE 3. Perform the Input Filter Capacitor Discharge 1. Remove input power to the V350-PRO. Procedure detailed earlier in this section. 2. Using a 5/16” nut driver remove the case wrap- 4.
  • Page 121 F-71 F-71 TROUBLESHOOTING & REPAIR REMOTE BOARD REMOVAL AND REPLACEMENT (continued) 5. Using a 5/16” nut driver remove the two screws 8. The front of the machine may now gently be pulled from the bottom front of the machine. See Figure forward to gain access to the remote Board.
  • Page 122 F-72 F-72 TROUBLESHOOTING & REPAIR REMOTE BOARD REMOVAL AND REPLACEMENT (continued) 10. Remove plug J37 from the display board. See 17. Replace plug J37 previously removed from the Wiring Diagram. display board. 11. Remove plugs J33, J333 and J331 from the 18.
  • Page 123 SNUBBER BOARD REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 124 F-74 F-74 TROUBLESHOOTING & REPAIR SNUBBER BOARD REMOVAL AND REPLACEMENT (continued) PROCEDURE 3. Perform the Input Filter Capacitor Discharge 1. Remove input power to the V350-PRO. Procedure detailed earlier in this section. 2. Using a 5/16” nut driver remove the case wrap- 4.
  • Page 125 POWER BOARD REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 126 F-76 F-76 TROUBLESHOOTING & REPAIR POWER BOARD REMOVAL AND REPLACEMENT (continued) FIGURE F.34. POWER BOARD LOCATION POWER BOARD LEFT SIDE PROCEDURE 3. Perform the Input Filter Capacitor Discharge 1. Remove input power to the V350-PRO. Procedure detailed earlier in this section. 2.
  • Page 127 F-77 F-77 TROUBLESHOOTING & REPAIR POWER BOARD REMOVAL AND REPLACEMENT (continued) 5. Locate the three plug connections. J41, J42 and 9. Replace with new power board. J43. See figure F.35. 10. Secure the new power board into its proper posi- 6.
  • Page 128 F-78 F-78 NOTES V350-PRO...
  • Page 129 INPUT RECTIFIER REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 130 F-80 F-80 TROUBLESHOOTING & REPAIR INPUT RECTIFIER REMOVAL AND REPLACEMENT (continued) PROCEDURE 1. Remove input power to the V350-PRO. 6. Remove the six screws from the terminals using a flathead screwdriver. Carefully note the position of all leads and their positions upon removal. See 2.
  • Page 131 F-81 F-81 TROUBLESHOOTING & REPAIR INPUT RECTIFIER REMOVAL AND REPLACEMENT (continued) 9. Apply a thin coat of Penetrox A-13 heatsink com- 11. Reconnect the previously removed leads to their pound to the point of contact between the input proper locations. Torque to 31 inch pounds. rectifier and the mounting surface.
  • Page 132 F-82 F-82 NOTES V350-PRO...
  • Page 133 REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 134 F-84 F-84 TROUBLESHOOTING & REPAIR OUTPUT RECTIFIER MODULES REMOVAL AND REPLACEMENT (continued) PROCEDURE 1. Remove input power to the V350-PRO. 5. Before the output rectifier modules can be reached, Snubber Board Removal Procedure must be performed. 2. Using a 5/16” nut driver remove the case wrap- around cover.
  • Page 135 F-85 F-85 TROUBLESHOOTING & REPAIR OUTPUT RECTIFIER MODULES REMOVAL AND REPLACEMENT (continued) 8. Under the copper plate previously removed, there 13. The screw threads may catch on the threads of is an allen bolt. Remove it using a 9/64” allen the heat sink, so be sure to get the face of the wrench.
  • Page 136 F-86 F-86 NOTES V350-PRO...
  • Page 137 CURRENT TRANSDUCER REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 138 F-88 F-88 TROUBLESHOOTING & REPAIR CURRENT TRANSDUCER REMOVAL AND REPLACEMENT (continued) PROCEDURE 4. Using a 5/16” nut driver remove the four screws from the bottom and right side of the rear assem- 1. Remove input power to the V350-PRO. bly. See Figure F.40. 2.
  • Page 139 F-89 F-89 TROUBLESHOOTING & REPAIR CURRENT TRANSDUCER REMOVAL AND REPLACEMENT (continued) 5. Label and remove the five leads connected to the 9. Using a hammer and a flathead screwdriver, firmly reconnect panel. Pliers may be necessary. tap the metal nut from the bottom of one of its ribs. This tapping will loosen the nut.
  • Page 140 F-90 F-90 TROUBLESHOOTING & REPAIR CURRENT TRANSDUCER REMOVAL AND REPLACEMENT (continued) 11. The back of the machine may now gently be 16. Using a 3/8” wrench, remove the three mounting pulled away to gain access to the current trans- screws from the output diode heatsink assembly. ducer.
  • Page 141 F-91 F-91 TROUBLESHOOTING & REPAIR CURRENT TRANSDUCER REMOVAL AND REPLACEMENT (continued) 21. Replace the current transducer. 30. Using a 3/8” wrench, replace leads #202, #203, #206, and #207A previously removed from the 22. Replace the two 3/8” mounting nuts previously reconnect switches.
  • Page 142 F-92 F-92 TROUBLESHOOTING AND REPAIR RETEST AFTER REPAIR Retest a machine: If it is rejected under test for any reason that requires you to remove any part which could affect the machine’s electrical characteristics. If you repair or replace any electrical components: Press and hold the MODE SELECT button (or the MEMORY button if an advanced process panel is installed) while applying power to the machine.
  • Page 143 F-93 F-93 TROUBLESHOOTING AND REPAIR RETEST AFTER REPAIR Expected Results Test Required Action Steps Lft.display Rt. display NOTE: If an Advanced Process Panel is not installed in the machine, skip steps 13-24 Turn the Advanced Process Panel left encoder clockwise LEnc =100 until the value displayed on the Advanced Process Panel...
  • Page 144 F-94 F-94 TROUBLESHOOTING AND REPAIR RETEST AFTER REPAIR Expected Results Test Required Action Steps Lft.display Rt. display dISP Verify that the Advanced Process Panel upper right dis- play contains the following pattern and that the bright- ness of the characters is uniform: “0123456789ABCDEF”...
  • Page 145 F-95 F-95 TROUBLESHOOTING AND REPAIR RETEST AFTER REPAIR Test Expected Results Required Action Steps Lft.display Rt. display 6-PIn roCP Adjust the remote output control potentiometer connect- ed to the 6-pin amphenol connector to its highest set- ting. Adjust the remote output control potentiometer connect- 6-PIn roCP ed to the 6-pin amphenol connector to its lowest set- ting.
  • Page 146 F-96 F-96 TROUBLESHOOTING AND REPAIR RETEST AFTER REPAIR Test Expected Results Required Action Steps Lft.display Rt. display dcon 14-pIn roCP This will only appear if a potentiometer is still connect- ed to the 14-pin amphenol connector. If this message appears, disconnect the potentiometer from the 14-pin amphenol connector.
  • Page 147 ELECTRICAL DIAGRAMS TABLE OF CONTENTS -ELECTRICAL DIAGRAMS SECTION- ELECTRICAL DIAGRAMS ............SECTION G WIRING DIAGRAM .
  • Page 148 ELECTRICAL DIAGRAMS WIRING DIAGRAM - INVERTEC V350-PRO NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The wiring diagram specific to your code is pasted inside one of the enclosure panels of your machine.
  • Page 149 ELECTRICAL DIAGRAMS SCHEMATIC - COMPLETE MACHINE NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. V350-PRO...
  • Page 150 THERMOSTAT INT_1_3PH THIS SHEET CONTAINS PROPRIETARY INFORMATION OWNED BY THE LINCOLN ELECTRIC COMPANY AND IS NOT TO BE REPRODUCED, DISCLOSED OR USED WITHOUT THE EXPRESS WRITTEN PERMISSION OF THE LINCOLN ELECTRIC COMPANY, CLEVELAND, OHIO U.S.A. UNLESS OTHERWISE SPECIFIED TOLERANCE "X" INFO.
  • Page 151 GROUND TIE POINT THIS SHEET CONTAINS PROPRIETARY INFORMATION OWNED BY THE LINCOLN ELECTRIC COMPANY AND IS NOT TO BE REPRODUCED, DISCLOSED OR USED WITHOUT THE EXPRESS WRITTEN PERMISSION OF THE LINCOLN ELECTRIC COMPANY, CLEVELAND, OHIO U.S.A. UNLESS OTHERWISE SPECIFIED TOLERANCE "X"...
  • Page 152 +15V VOLTAGE FEEDBACK THIS SHEET CONTAINS PROPRIETARY INFORMATION OWNED BY THE LINCOLN ELECTRIC COMPANY AND IS NOT TO BE REPRODUCED, DISCLOSED OR USED WITHOUT THE EXPRESS WRITTEN PERMISSION OF THE LINCOLN ELECTRIC COMPANY, CLEVELAND, OHIO U.S.A. UNLESS OTHERWISE SPECIFIED TOLERANCE "X"...
  • Page 153 22pF GSPI THIS SHEET CONTAINS PROPRIETARY INFORMATION OWNED BY THE LINCOLN ELECTRIC COMPANY AND IS NOT TO BE REPRODUCED, DISCLOSED OR USED WITHOUT THE EXPRESS WRITTEN PERMISSION OF THE LINCOLN ELECTRIC COMPANY, CLEVELAND, OHIO U.S.A. UNLESS OTHERWISE SPECIFIED TOLERANCE "X" INFO.
  • Page 154 ELECTRICAL DIAGRAMS SCHEMATIC - POWER SUPPLY PRINTED CIRCUIT BOARD NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. V350-PRO...
  • Page 155 ELECTRICAL DIAGRAMS SCHEMATIC - SWITCH PRINTED CIRCUIT BOARD NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. V350-PRO...
  • Page 156 Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician.
  • Page 157 G-11 G-11 ELECTRICAL DIAGRAMS SCHEMATIC - DISPLAY PRINTED CIRCUIT BOARD NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. V350-PRO...
  • Page 158 Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician.
  • Page 159 G-13 G-13 ELECTRICAL DIAGRAMS SCHEMATIC - LED SELECT PRINTED CIRCUIT BOARD NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. V350-PRO...
  • Page 160 Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician.
  • Page 161 G-15 G-15 ELECTRICAL DIAGRAMS SCHEMATIC - LED POTENTIOMETER PRINTED CIRCUIT BOARD NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. V350-PRO...
  • Page 162 Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician.
  • Page 163 G-17 G-17 ELECTRICAL DIAGRAMS SCHEMATIC-SPI REMOTE PRINTED CIRCUIT BOARD NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. V350-PRO...
  • Page 164 Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician.
  • Page 165 G-19 G-19 ELECTRICAL DIAGRAMS SCHEMATIC-SNUBBER PRINTED CIRCUIT BOARD 6-2-2000 S24761 NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. V350-PRO...
  • Page 166 Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician.
  • Page 167 Please include the machine’s code number and how the problem was resolved. Thank You, Technical Services Group Lincoln Electric Co. 22801 ST. Clair Ave. Cleveland, Ohio 44117-1199 FAX 216-481-2309 SVM Number ___________________________...

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