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 . . . and thoughtful operation on your part.
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.
ELECTRIC SHOCK can kill. 3.a. The electrode and work (or ground) circuits are electrically “hot” when the welder is on. Do not touch these “hot” parts with your bare skin or wet clothing. Wear dry, hole-free gloves to insulate hands. 3.b.
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WELDING SPARKS can cause fire or explosion. 6.a. Remove fire hazards from the welding area. If this is not possible, cover them to prevent the welding sparks from starting a fire. Remember that welding sparks and hot materials from welding can easily go through small cracks and openings to adjacent areas.
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PRÉCAUTIONS DE SÛRETÉ Pour votre propre protection lire et observer toutes les instructions et les précautions de sûreté specifiques qui parraissent dans ce manuel aussi bien que les précautions de sûreté générales suiv- antes: Sûreté Pour Soudage A L’Arc 1. Protegez-vous contre la secousse électrique: a.
MASTER TABLE OF CONTENTS FOR ALL SECTIONS 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 RETURN TO MAIN INDEX...
TECHNICAL SPECIFICATIONS - INPUT AC VOLTAGE & DC OUTPUT Product Ordering Input AC Rated DC Output Name Information Voltage K1728-5 Construction 350A / 34V / 60% Invertec K1728-6 208-230/ V350- Factory 380-400/ 415-460/ 60/50 Hz K1728-7 300A / 32V /100% Advanced 1&...
SAFETY PRECAUTIONS WARNING ELECTRIC SHOCK can kill. • TURN THE INPUT POWER OFF AT THE DISCONNECT SWITCH BEFORE ATTEMPTING TO CONNECT OR DIS- CONNECT INPUT POWER LINES, OUTPUT CABLES, OR CONTROL CABLES. • Only qualified personnel should perform this installation. •...
LN-7 Connection Instructions An LN-7 can only be used with the “Factory” & “Advanced Process” versions of the 350-Pro. • Turn the Invertec power switch "off". • Connect the K480 control cable from the LN-7 to the 14-pin MS-style connector. •...
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.
SAFETY PRECAUTIONS WARNING ELECTRIC SHOCK can kill. • Do not touch electrically live parts or electrode with skin or wet clothing. • Insulate yourself from work and ground. • Always wear dry insulating gloves. ------------------------------------------------------------------------ FUMES AND GASES can be dangerous. •...
• The unit will power up in "pre-determined preferred" trigger modes. STICK = ON CV = REMOTE TIG = REMOTE if remote output controls are attached to the machine. TIG = 0N if remote output controls are not attached to the machine.
• The Arc Control regulates the Arc Force to adjust the short circuit current. The minimum setting (-10) will produce a "soft" arc and will produce minimal spat- ter. The maximum setting (+10) will produce a "crisp" arc and will minimize electrode sticking. TIG GTAW: The TIG mode features continuous control from 5 to 425 amps.
7A. ADVANCED PROCESS PANEL (See Figure B.2) To program Welding modes. SELECT knob is used to Scroll through all Welding modes. The MEMORY but- ton is used to store and access Welding modes into locations M1 thru M8. Modes: In addition to the 5 welding modes described in SEC- TION 7, the Advanced Process Panel allows you to select the Following additional modes.
CONTROLS: (See Figure B.2.) The MEMORY button and SELECT knob are used together to select a welding process and store it in memory (M1 thru M8). The SELECT knob scrolls through the, welding process modes and memory M1 thru M8. The MEMORY button stores the welding process in memory.
76 (wiper) to lead 77 would produce the cur- rent that has been set by the Invertec V350-Pro’s front panel Output Control.) • Remotes of this type offered by Lincoln Electric are the K857, K812 and K870. Voltage Control •...
B-10 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.
B-11 SPECIAL WELDING PROCESSES AVAILABLE ON THIS MACHINE POWER MODE™ The Power Mode™ process was developed by Lincoln to maintain a stable and smooth arc at low procedure settings which are needed to weld thin metal without pop-outs or burning-through. For Aluminum welding, it provides excellent control and the ability to maintain constant arc length.
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B-12 PULSE WELDING (GMAW-P) The pulsed-arc process is, by definition, a spray trans- fer process wherein spray transfer occurs in pulses at regularly spaced intervals. In the time between pulses, the welding current is reduced and no metal transfer occurs. Pulsed-arc transfer is obtained by operating a power source between low and high current levels.
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Since Arc Control varies weld droplet transfer rate, the Arc Control can be used to vary the ripple spacing in the weld bead. BENEFITS OF PULSE ON PULSE FROM LINCOLN ELECTRIC • Excellent appearance of the weld bead • Improved cleaning action • Reduced porosity Table B.2 shows WFS and Trim settings for common...
Cobramatic Connection Instructions A Cobramatic can only be used with a Factory or "CE" version of the V350 1. Turn the Invertec power switch "off" 2. Connect the control cable from the Cobramatic to the 24/42 VAC 14-pin wire feeder amphenol on the rear of the Invertec.
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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.
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CONNECTION OF LINCOLN ELEC- TRIC WIRE FEEDERS CONNECTION OF THE LN-25 TO THE V350-PRO “ACROSS THE ARC” WITH OPTIONAL 6 PIN K441-1 REMOTE CON- TROL. 1. Remove input power to the V350-PRO. 2. Connect the electrode cable to the output terminal of polarity required by the electrode.
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CONNECTION OF THE LN-25 TO THE V350-PRO “ACROSS THE ARC” WITH OPTIONAL 6 PIN K857 REMOTE CON- TROL. 1. Remove input power to the V350-PRO. 2. Connect the electrode cable to the output terminal of polarity required by the electrode. Connect the work lead to the other terminal.
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CONNECTION OF THE LN-25 WITH K431 REMOTE OPTION TO THE V350-PRO. NOTE: AN LN-25 CAN ONLY BE USED WITH A FAC- TORY OR “CE” VERSION OF THE V350-PRO. 1. Remove input power to the V350-PRO. 2. Connect the electrode cable to the output terminal of polarity required by the electrode.
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CONNECTION OF THE K867 ADAPTER WITH LN-25 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. 4.
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CONNECTION OF THE LN-7 TO THE V350- PRO USING K480 CONTROL CABLE (SEE FIGURE C.5) NOTE: AN LN-7 CAN ONLY BE USED WITH A FAC- TORY OR “CE” VERSION OF THE V350-PRO. IF YOUR LN-7 COMES EQUIPPED WITH A K291 OR K404 INPUT CABLE, REFER TO THE CONNECTION OF THE LN-7 USING K867 UNIVERSAL ADAPTER.
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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. E L E C T R O D E C A B L E E L E C T R O D E C A B L E T O L N - 7 T O L N - 7...
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C-10 CONNECTION OF THE LN-742 TO THE V350-PRO (SEE FIGURE C.7) NOTE: AN LN-7 CAN ONLY BE USED WITH A FAC- TORY OR “CE” VERSION OF THE V350-PRO. 1. Remove input power to the V350-PRO. 2. Connect the electrode cable from the LN-742 to the “+”...
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C-11 CONNECTION OF THE LN-10 TO THE V350-PRO USING THE K1505 CONTROL CABLE. NOTE: AN LN-10 CAN ONLY BE USED WITH A FAC- TORY OR “CE” VERSION OF THE V350-PRO. 1. Remove input power to the V350-PRO. 2. Connect the K1505 control cable from the LN-10 to the Invertec 24/42VAC 14 pin amphenol con- necter on the rear of the V350-PRO.
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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...
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WARNING Have qualified personnel do the maintenance work. Always use the greatest care when working near moving parts. Do not put your hands near the cooling blower fan. If a problem cannot be corrected by following the instructions, take the machine to the nearest Lincoln Field Service Shop.
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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 K 60 TI G G TA IN A C V- W IR C V- R ED...
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Section E-1 -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 Under/Over Voltage Protection ...E-6...
THEORY OF OPERATION FIGURE E.2 – INPUT VOLTAGE AND PRECHARGE Input Input switch Rectifier Reconnect 115VAC Fan Supply Auxiliary Transformer 115VAC, 42VAC 24VAC Power Board 28VAC 40VDC 14 Pin Amphenol Remote Control & Trigger 6 Pin Amphenol Output Potentiometer GENERAL DESCRIPTION The Invertec V350-Pro is an inverter based welding power source that offers multi mode constant voltage (CV) and constant current (CC) welding and is rated at...
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THEORY OF OPERATION FIGURE E.3 – SWITCH BOARD & MAIN TRANSFORMER Input Input switch Rectifier Reconnect 115VAC Fan Supply Auxiliary Transformer 115VAC, 42VAC 24VAC Power Board 28VAC 40VDC 14 Pin Amphenol Remote Control & Trigger 6 Pin Amphenol SWITCH BOARD & MAIN TRANSFORMER There is one switch board in the Invertec V350-Pro.
THEORY OF OPERATION FIGURE E.4 – POWER BOARD, CONTROL BOARD AND SERIAL PERIPHERAL INTERFACE (SPI) COMMUNICATIONS Input Input switch Rectifier Reconnect Switch 115VAC Fan Supply Auxiliary Transformer 115VAC, 42VAC 24VAC Power Board 28VAC 40VDC 14 Pin Amphenol Remote Control & Trigger 6 Pin Amphenol Output...
THEORY OF OPERATION FIGURE E.5 – OUTPUT RECTIFIER AND CHOKE Input Input switch Rectifier Reconnect Switch 115VAC Fan Supply Auxiliary Transformer 115VAC, 42VAC 24VAC Power Board 28VAC 40VDC 14 Pin Amphenol Remote Control & Trigger 6 Pin Amphenol Output Potentiometer OUTPUT RECTIFIER AND CHOKE The output rectifier receives the AC output from the main transformer secondary and rectifies it to a DC...
THEORY OF OPERATION THERMAL PROTECTION Two normally closed (NC) thermostats protect the machine from excessive operating temperatures. These thermostats are wired in series and are con- nected to the control board. One of the thermostats is located on the heat sink of the switch board and the other is located on the output choke.
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THEORY OF OPERATION INSULATED GATE BIPOLAR TRANSISTOR (IGBT) OPERATION An IGBT is a type of transistor. IGBT are semiconduc- tors well suited for high frequency switching and high current applications. Example A in Figure E.6 shows an IGBT in passive mode.
THEORY OF OPERATION FIGURE E.7 — TYPICAL IGBT OUTPUTS. PULSE WIDTH MODULATION The term Pulse Width Modulation is used to describe how much time is devoted to conduction in the posi- tive and negative portions of the cycle. Changing the pulse width is known as modulation.
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Section F-1 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 Output Diode Modules Test ...F-29...
TROUBLESHOOTING & REPAIR HOW TO USE TROUBLESHOOTING GUIDE 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.
- If the PC board uses protective shorting jumpers, don’t remove them until installation is complete. - 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- er failure analysis.
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). POSSIBLE AREAS OF...
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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). detailed in the beginning of this manual.
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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). POSSIBLE AREAS OF...
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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). POSSIBLE AREAS OF...
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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). POSSIBLE AREAS OF...
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TROUBLESHOOTING & REPAIR DESCRIPTION/ FAULT CODES DEFINITION Main transformer primary over current Capacitor bank “A” (lower) is under voltage NOTE: If more than one fault message is being displayed, perform all the checks for the faults before replacing the printed circuit board CORRECTIVE SERVICE FACILITY ACTION...
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F-10 TROUBLESHOOTING & REPAIR DESCRIPTION/ FAULT CODES DEFINITION Capacitor bank "B"(upper) is under voltage. Capacitor bank "A"(lower) is over voltage. NOTE: If more than one fault message is being displayed, perform all the checks for the faults before replacing the printed circuit board CORRECTIVE SERVICE FACILITY ACTION...
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F-11 TROUBLESHOOTING & REPAIR DESCRIPTION/ FAULT CODES DEFINITION Capacitor bank "B"(lower) is over voltage. The soft start function failed. NOTE: If more than one fault message is being displayed, perform all the checks for the faults before replacing the printed circuit board CORRECTIVE ACTION Make sure the reconnect...
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F-12 TROUBLESHOOTING & REPAIR DESCRIPTION/ FAULT CODES DEFINITION Electrical "glitch" on the primary over current fault detector circuit. Capacitor banks "A" (lower) and "B"(upper) are not balanced. The machine has detected a fault in the central processing unit (CPU). NOTE: If more than one fault message is being displayed, perform all the checks for the faults before replacing the printed circuit board CORRECTIVE...
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F-13 TROUBLESHOOTING & REPAIR DESCRIPTION/ FAULT CODES DEFINITION Electrical "glitch" on the V/F signals from the main switch board to the control board. The selected weld mode “bad node” “####” does not exist in the weld table that is presently loaded in the machine.
TROUBLESHOOTING & REPAIR INPUT FILTER CAPACITOR DISCHARGE PROCEDURE 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.
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F-16 TROUBLESHOOTING & REPAIR INPUT FILTER CAPACITOR DISCHARGE PROCEDURE (continued) WARNING ELECTRIC SHOCK • Have an electrician install and service this equipment. • Turn the input power off at the fuse box before working on equipment. • Do not touch electrically hot parts. •...
TROUBLESHOOTING & REPAIR MAIN SWITCH BOARD TEST 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.
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F-18 TROUBLESHOOTING & REPAIR MAIN SWITCH BOARD TEST (continued) FIGURE F.2 MAIN SWITCH BOARD LEAD LOCATIONS TEST PROCEDURE 1. Remove input power to the V350-PRO. 2. Using a 5/16” nut driver, remove the case wraparound. 3. Perform the Input Filter Capacitor Discharge Procedure detailed earlier in this section.
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F-19 TROUBLESHOOTING & REPAIR MAIN SWITCH BOARD TEST (continued) 6. If any test fails replace the switch board. See Main Switch Board Removal and Replacement. 7. If the switch board resistance tests are OK, check connections on plugs J20, J21, J22 and all asso- ciated wiring.
F-21 TROUBLESHOOTING & REPAIR 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.
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F-22 TROUBLESHOOTING & REPAIR INPUT RECTIFIER TEST (CONTINUED) TEST PROCEDURE 1. Remove input power to the V350-PRO machine. 2. Using a 5/16” nut driver, remove the case wraparound cover. 3. Perform Capacitor Procedure detailed earlier in this section. 4. Locate the input rectifier and associated leads.
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F-23 TROUBLESHOOTING & REPAIR INPUT RECTIFIER TEST (CONTINUED) TEST POINT TERMINALS + PROBE 207A 207A 207A 9. If the input rectifier does not meet the acceptable readings outlined in Table F.2 the component may be faulty. Replace Note: Before replacing the input rectifier, check the input power switch and per- form the Main Switch Board Test.
F-25 TROUBLESHOOTING & REPAIR 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.
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F-26 TROUBLESHOOTING & REPAIR POWER BOARD TEST (CONTINUED) TEST PROCEDURE 1. Remove input power to the V350-PRO machine. 2. Using a 5/16” nut driver, remove the case wraparound cover. 3. Perform Capacitor Procedure detailed earlier in this section. 4. Locate the power board and plugs J41, J42 and J43.
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F-27 TROUBLESHOOTING & REPAIR POWER BOARD TEST (CONTINUED) Table F.3 Power Board Voltage Checks CHECK POINT TEST LOCATION DESCRIPTION POWER PC CHECK 40VDC BOARD SUPPLY FROM CONNECTOR RECT. BRIDGE PLUG J41 TO POWER BD. POWER PC CHECK +15VDC BOARD SUPPLY FROM CONNECTOR POWER PC PLUG J42...
TROUBLESHOOTING & REPAIR OUTPUT DIODE MODULES TEST 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.
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F-30 TROUBLESHOOTING & REPAIR OUTPUT DIODE MODULES TEST (continued) NEGATIVE OUTPUT TERMINAL TEST PROCEDURE 1. Remove input power to the V350-PRO. 2. Locate the output terminals on the front panel of the machine. See Figure F.5. 3. Remove any output cables and load from the output terminals.
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F-31 TROUBLESHOOTING & REPAIR OUTPUT DIODE MODULES TEST (continued) 5. If 200 ohms is measured then the output diodes are not “shorted”. NOTE: There is a 250 ohm resistor across the welding output terminals. 6. If less than 200 ohms is measured, one or more diodes or the snubber board may be faulty.
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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...
TROUBLESHOOTING & REPAIR AUXILIARY TRANSFORMER TEST 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.
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F-34 TROUBLESHOOTING & REPAIR AUXILIARY TRANSFORMER TEST (continued) Transformer Secondary Lead Plugs P52 -S TI -S TI TI G G TA IR E -F LU W AR TEST PROCEDURE 1. Remove input power to the V350-PRO. 2. Using a 5/16” nut driver, remove the case wraparound cover.
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F-35 TROUBLESHOOTING & REPAIR AUXILIARY TRANSFORMER NO.1 TEST (continued) LEAD IDENTIFICATION 31 TO 532 42 TO 541 24 TO 541 54 TO 541 7. Carefully apply the correct input voltage to the V350-PRO and check for the correct sec- ondary voltages per table F.4. Make sure the reconnect jumper lead and switch are config- ured correctly for the input voltage being applied.
TROUBLESHOOTING AND REPAIR CURRENT TRANSDUCER TEST 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.
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F-38 TROUBLESHOOTING AND REPAIR CURRENT TRANSDUCER TEST (continued) FIGURE F.10 Metal Plate Removal & Plug J8 Location L T S TI C K 70 TI C TI G K 60 G TA C V- W IR C V- R EM O TE -1 0 IS P...
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F-39 TROUBLESHOOTING AND REPAIR CURRENT TRANSDUCER TEST (continued) OUTPUT LOAD CURRENT 8. Check the feedback voltage from the current transducer using a resistive load bank and with the V350-PRO in mode 200. Mode 200 is a constant current test mode. This mode can be accessed from the front panel of the V350 by pressing and holding the Mode Select but- ton while turning the machine on.
TROUBLESHOOTING AND REPAIR FAN CONTROL AND MOTOR TEST 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.
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F-42 TROUBLESHOOTING AND REPAIR FAN CONTROL AND MOTOR TEST (continued) TEST PROCEDURE 1. Remove the input power to the V350-PRO machine. 2. Using the 5/16” nut driver, remove the case wraparound cover. 5. Carefully apply the correct input power to the machine.
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F-43 TROUBLESHOOTING AND REPAIR FAN CONTROL AND MOTOR TEST (continued) 7. If the 115VAC is low or not present check cir- cuit breaker CB2 located on the front panel. If the circuit breaker is OK, perform The Auxiliary Transformer Test. Check plug J22, circuit breaker CB2 and associated leads for loose or faulty connections.
TROUBLESHOOTING AND REPAIR SPI CABLE RESISTANCE AND VOLTAGE TEST 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.
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F-46 TROUBLESHOOTING AND REPAIR SPI CABLE RESISTANCE AND VOLTAGE TEST (continued) TEST PROCEDURE 1. Remove the input power to the V350-PRO. 2. Using the 5/16” nut driver, remove the case wraparound cover. 3. Perform the Capacitor Discharge Procedure. 4. Perform Display Board Procedure.
TROUBLESHOOTING AND REPAIR VOLTAGE AND CURRENT CALIBRATION PROCEDURE 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.
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F-48 TROUBLESHOOTING AND REPAIR VOLTAGE AND CURRENT CALIBRATION PROCEDURE (continued) CALIBRATION CHECK The calibration of the V350-PRO can be checked using a resistive load bank with the V350-PRO in mode 200. Mode 200 is a constant current test mode. 1. Press and hold in the Mode Select button. 2.
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F-49 TROUBLESHOOTING AND REPAIR VOLTAGE AND CURRENT CALIBRATION PROCEDURE (continued) CURRENT CALIBRATION PROCEDURE 1. Connect the resistive load band (approxi- mately .087 ohms) and test ammeter to the welding output terminals. 2. Press and hold in the Mode Select/Memory button. 3.
TROUBLESHOOTING & REPAIR CONTROL BOARD REMOVAL AND REPLACEMENT 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.
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F-52 TROUBLESHOOTING & REPAIR CONTROL BOARD REMOVAL AND REPLACEMENT (continued) FIGURE F.16 - CONTROL BOARD LOCATION TI CK TI CK TI G G TA -F LU X CO T ST W AR PROCEDURE 1. Remove input power to the V350-PRO. 2.
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F-53 TROUBLESHOOTING & REPAIR CONTROL BOARD REMOVAL AND REPLACEMENT (continued) FIGURE F.18. - CONTROL BOARD ALL PLUG LOCATIONS L T S -S T IC K -S T IC K T IG IN A IR E -F L -1 0 IS P CAUTION Observe static precautions detailed in PC Board Troubleshooting Procedures at the...
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F-54 TROUBLESHOOTING & REPAIR CONTROL BOARD REMOVAL AND REPLACEMENT (continued) 12. Using a 3/8” nut driver remove the two mounting 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") 15.
TROUBLESHOOTING & REPAIR DISPLAY BOARD REMOVAL AND REPLACEMENT 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.
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F-56 TROUBLESHOOTING & REPAIR DISPLAY BOARD REMOVAL & REPLACEMENT (continued) FIGURE F.20. – DISPLAY BOARD LOCATION Display Board Mode Board or Advanced Process Board -S T K 70 T IC K 60 T IG G TA -F LU PROCEDURE 1. Remove input power to the V350-PRO. 2.
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F-57 TROUBLESHOOTING & REPAIR DISPLAY BOARD REMOVAL & REPLACEMENT (continued) FIGURE F.21. – CASE FRONT SCREW LOCATION Phillips Head Screws 5. Using a 5/16” nut driver remove the two screws from the bottom of the front of the machine. See Figure F.21. 6.
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F-58 TROUBLESHOOTING & REPAIR DISPLAY BOARD REMOVAL & REPLACEMENT (continued) 10. Remove plug J37 from the display board. See the Wiring Diagram. 11. Remove plug J3 originating from the control board located directly across from the display board. See the Wiring Diagram. 12.
TROUBLESHOOTING & REPAIR MAIN SWITCH BOARD REMOVAL AND REPLACEMENT 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.
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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. 2. Using a 5/16” nut driver remove the case wrap- around cover. 3.
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F-61 TROUBLESHOOTING & REPAIR MAIN SWITCH BOARD REMOVAL & REPLACEMENT (continued) FIGURE F.23. – 3/16” ALLEN BOLT LOCATION 9. Using a 3/16” allen wrench remove four allen bolts and washers as shown in Figure F.23. At this point, the board is ready for removal. Carefully remove the board from the 4 nylon mounting pins.
ADVANCED PROCESS PANEL REMOVAL AND REPLACEMENT 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.
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F-64 TROUBLESHOOTING & REPAIR ADVANCED PROCESS PANEL REMOVAL AND REPLACEMENT (continued) FIGURE F.25. – MODE BOARD LOCATION Display Board Mode Board or Advanced Process Board -S T K 70 -S T T IG K 60 G TA IR E -F LU PROCEDURE 1.
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F-65 TROUBLESHOOTING & REPAIR ADVANCED PROCESS PANEL REMOVAL AND REPLACEMENT (continued) FIGURE F.26. – CASE FRONT SCREW REMOVAL Phillips Head Screws 5. Using a 5/16” nut driver remove the two screws from the bottom of the front of the machine. See Figure F.26.
F-66 TROUBLESHOOTING & REPAIR ADVANCED PROCESS PANEL REMOVAL AND REPLACEMENT (continued) CONTROL SELECT MEMOR MEMORY BUTT BUTTON 9. Remove plug #J33 from the remote board. See the Wiring Diagram. 10. Open the cover of the weld mode display on the front of the machine. 11.
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F-67 TROUBLESHOOTING & REPAIR ADVANCED PROCESS PANEL REMOVAL AND REPLACEMENT (continued) 18. Replace the Advanced Process board. 19. Replace the two phillips head screws at the bottom of the advanced process board. 20. Perform the Remote Board Replacement Procedure. 21. Replace the 9/16” nuts and their washers behind the “Adjust”...
TROUBLESHOOTING & REPAIR REMOTE BOARD REMOVAL AND REPLACEMENT 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.
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F-70 TROUBLESHOOTING & REPAIR REMOTE BOARD REMOVAL AND REPLACEMENT (continued) PROCEDURE 1. Remove input power to the V350-PRO. 2. Using a 5/16” nut driver remove the case wrap- around cover. FIGURE F.29. – REMOTE BOARD LOCATION Remote Board Display Board Mode Board or Advanced Process Board...
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F-71 TROUBLESHOOTING & REPAIR REMOTE BOARD REMOVAL AND REPLACEMENT (continued) 5. Using a 5/16” nut driver remove the two screws from the bottom front of the machine. See Figure F.30. 6. Using a flat head screwdriver remove the two screws and their washers from around the input power switch.
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F-72 TROUBLESHOOTING & REPAIR REMOTE BOARD REMOVAL AND REPLACEMENT (continued) 10. Remove plug J37 from the display board. See Wiring Diagram. 11. Remove plugs J33, J333 and J331 from the remote board. 12. Using a flat head screwdriver, remove the two mounting screws and washers from the bottom of the remote board.
TROUBLESHOOTING & REPAIR SNUBBER BOARD REMOVAL AND REPLACEMENT 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.
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F-74 TROUBLESHOOTING & REPAIR SNUBBER BOARD REMOVAL AND REPLACEMENT (continued) PROCEDURE 1. Remove input power to the V350-PRO. 2. Using a 5/16” nut driver remove the case wrap- around cover. FIGURE F.32. – SNUBBER BOARD LOCATION Snubber Board 5. Remove small lead #B1 from the board. Figure F.33.
TROUBLESHOOTING & REPAIR POWER BOARD REMOVAL AND REPLACEMENT 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.
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F-76 TROUBLESHOOTING & REPAIR POWER BOARD REMOVAL AND REPLACEMENT (continued) FIGURE F.34. POWER BOARD LOCATION POWER BOARD PROCEDURE 1. Remove input power to the V350-PRO. 2. Using a 5/16” nut driver remove the case wrap- around cover. LEFT SIDE 3. Perform the Input Filter Capacitor Discharge Procedure detailed earlier in this section.
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F-77 TROUBLESHOOTING & REPAIR POWER BOARD REMOVAL AND REPLACEMENT (continued) 5. Locate the three plug connections. J41, J42 and J43. See figure F.35. 6. Carefully remove the three plugs from the power board. 7. Remove the three nuts and at the corners of the board using a 3/8”...
TROUBLESHOOTING & REPAIR INPUT RECTIFIER REMOVAL AND REPLACEMENT 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.
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F-80 TROUBLESHOOTING & REPAIR INPUT RECTIFIER REMOVAL AND REPLACEMENT (continued) PROCEDURE 1. Remove input power to the V350-PRO. 2. Using a 5/16” nut driver remove the case wraparound cover. 3. Perform the Input Filter Capacitor Discharge Procedure detailed earlier in this section. 4.
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F-81 TROUBLESHOOTING & REPAIR INPUT RECTIFIER REMOVAL AND REPLACEMENT (continued) 9. Apply a thin coat of Penetrox A-13 heatsink com- pound to the point of contact between the input rectifier and the mounting surface. 10. Secure the new input bridge into its proper posi- tion with the two 3/16”in.
TROUBLESHOOTING & REPAIR OUTPUT RECTIFIER MODULES REMOVAL AND 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.
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F-84 TROUBLESHOOTING & REPAIR OUTPUT RECTIFIER MODULES REMOVAL AND REPLACEMENT (continued) PROCEDURE 1. Remove input power to the V350-PRO. 2. Using a 5/16” nut driver remove the case wrap- around cover. 3. Perform the Input Filter Capacitor Discharge Procedure detailed earlier in this section. 4.
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F-85 TROUBLESHOOTING & REPAIR OUTPUT RECTIFIER MODULES REMOVAL AND REPLACEMENT (continued) 8. Under the copper plate previously removed, there is an allen bolt. Remove it using a 9/64” allen wrench. See Figure F.39. 9. Using a 7/16” socket remove the mounting bolts at the top and bottom of the modules.
TROUBLESHOOTING & REPAIR CURRENT TRANSDUCER REMOVAL AND REPLACEMENT 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.
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F-88 TROUBLESHOOTING & REPAIR CURRENT TRANSDUCER REMOVAL AND REPLACEMENT (continued) PROCEDURE 1. Remove input power to the V350-PRO. 2. Using a 5/16” nut driver remove the case wrap- around cover. 3. Perform the Input Filter Capacitor Discharge Procedure detailed earlier in this section. FIGURE F.40.
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F-89 TROUBLESHOOTING & REPAIR CURRENT TRANSDUCER REMOVAL AND REPLACEMENT (continued) 5. Label and remove the five leads connected to the reconnect panel. Pliers may be necessary. 6. Label and remove the two leads connected to the CB2 circuit breaker. 7. Using a crescent wrench, remove the large plastic nut from around the input power line located at bot- tom of the rear assembly.
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F-90 TROUBLESHOOTING & REPAIR CURRENT TRANSDUCER REMOVAL AND REPLACEMENT (continued) 11. The back of the machine may now gently be pulled away to gain access to the current trans- ducer. Note: The rear of the machine cannot be removed completely. 12.
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F-91 TROUBLESHOOTING & REPAIR CURRENT TRANSDUCER REMOVAL AND REPLACEMENT (continued) 21. Replace the current transducer. 22. Replace the two 3/8” mounting nuts previously removed. 23. Reconnect plug #J90 to the current transducer. 24. Replace any necessary cable ties previously cut. 25.
F-92 TROUBLESHOOTING AND 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.
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F-93 TROUBLESHOOTING AND REPAIR Test Steps NOTE: If an Advanced Process Panel is not installed in the machine, skip steps 13-24 Turn the Advanced Process Panel left encoder clockwise until the value displayed on the Advanced Process Panel lower left display equals 100. Note that this should require exactly one revolution of the encoder knob.
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F-94 TROUBLESHOOTING AND REPAIR Test Steps 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” Press and release the Advanced Process Panel Memory button to advance to the next step. Verify that the Advanced Process Panel lower right dis- play contains the following pattern and that the bright- ness of the characters is uniform:...
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F-95 TROUBLESHOOTING AND REPAIR Test Steps 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- ed to the 6-pin amphenol connector to its lowest set- ting.
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F-96 TROUBLESHOOTING AND REPAIR Test Steps 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. Test steps 21-24 verify the functionality of the gas sole- noid.
SCHEMATIC - COMPLETE MACHINE RECONNECT SWITCH N.C. N.B. INPUT SWITCH WHITE (BROWN) INPUT LINES (BLACK) BLACK (BLUE) GREEN (GREEN/YELLOW) 3.5A CE COLORS IN Dashed lines represent copper bus connections. PARANTHESYS AUXILIARY TRANSFORMER CONSTRUCTION MODELS DO NOT HAVE CB1, CB2 OR REMOTE, LEAD 532 GOES TO J22 AND LEAD 541 GOES TO THE CONTROL RECTIFIER IN THE CONSTRUCTION MODEL.
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ELECTRICAL DIAGRAMS SCHEMATIC - DIGITAL CONTROL PC BOARD #1 NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. V350-PRO...
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ELECTRICAL DIAGRAMS SCHEMATIC - DIGITAL CONTROL PC BOARD #2 NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. V350-PRO...
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ELECTRICAL DIAGRAMS SCHEMATIC - DIGITAL CONTROL PC BOARD #3 NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. V350-PRO...
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ELECTRICAL DIAGRAMS SCHEMATIC - DIGITAL CONTROL PC BOARD #4 NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. V350-PRO...
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(UNLESS OTHERWISE SPECIFIED) 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"...
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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...
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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.
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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.
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DO NOT SCALE THIS DRAWING ELECTRICAL DIAGRAMS +15 VDC LED_BANK_1 LED_BANK_2 SWITCH THE LINCOLN ELECTRIC CO. AND IS NOT TO BE REPRODUCED, DISCLOSED OR USED WITHOUT THE EXPRESS PERMISSION OF GENERAL INFORMATION A PRINTED ELECTRICAL SYMBOLS PER E1537 WITHOUT AFFECTING...
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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.
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ELECTRICAL DIAGRAMS +15V POT_1 +15V +10VREF +15 VDC POT_2 THE LINCOLN ELECTRIC CO. AND IS NOT TO BE REPRODUCED, DISCLOSED OR USED WITHOUT THE EXPRESS PERMISSION OF GENERAL INFORMATION A PRINTED ELECTRICAL SYMBOLS PER E1537 WITHOUT AFFECTING -------- CAPACITORS =...
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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.
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DIODES = (UNLESS OTHERWISE SPECIFIED) KEY ON MODE CONNECTOR THE LINCOLN ELECTRIC CO. THIS SHEET CONTAINS PROPRIETARY INFORMATION OWNED BY THE LINCOLN ELECTRIC CO. AND IS NOT TO BE REPRODUCED, DISCLOSED OR USED WITHOUT THE EXPRESS PERMISSION OF Ch’ge.Sht.No. EQUIP.
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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.
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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...
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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.
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Your Company__________________________ Your Name_____________________________ Please give detailed description below: ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ SD287 01/99 Thank You, Technical Services Group Lincoln Electric Co. 22801 ST. Clair Ave. Cleveland, Ohio 44117-1199 FAX 216-481-2309...