Lincoln Electric FLEXTEC 350X Service Manual
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Lincoln Electric FLEXTEC 350X Service Manual

Lincoln Electric FLEXTEC 350X Service Manual

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FLEXTEC ® 350X
For use with machines having Code Numbers:
Standard
12321, 12611, 12575, 12751
Construction
12464, 12610, 12576, 12752
SERVICE MANUAL
SVM268
| Issue D ate 18-Oct
© Lincoln Global, Inc. All Rights Reserved.
Dinse
12637, 12638, 12754, 12755
Red-D-Arc
12465, 12612, 12577, 12753

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Summary of Contents for Lincoln Electric FLEXTEC 350X

  • Page 1 FLEXTEC ® 350X For use with machines having Code Numbers: Standard Dinse 12321, 12611, 12575, 12751 12637, 12638, 12754, 12755 Red-D-Arc Construction 12464, 12610, 12576, 12752 12465, 12612, 12577, 12753 SERVICE MANUAL SVM268 | Issue D ate 18-Oct © Lincoln Global, Inc. All Rights Reserved.
  • Page 2 THANK YOU FOR SELECTING A QUALITY PRODUCT BY KEEP YOUR HEAD OUT OF THE FUMES. DON’T get too close to the arc. LINCOLN ELEC TRIC. Use corrective lenses if necessary to stay a reasonable distance away from the arc. READ and obey the Safety Data PLEASE EXAMINE CARTON AND EQUIPMENT FOR Sheet (SDS) and the warning label DAMAGE IMMEDIATELY...

  • Page 3: Section A: Warnings

    W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available from the Lincoln Electric Company, 2.d. All welders should use the following procedures in order to 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199.
  • Page 4 SAFETY ELECTRIC SHOCK ARC RAYS CAN BURN. CAN KILL. 3.a. The electrode and work (or ground) circuits are 4.a. Use a shield with the proper filter and cover plates to protect your electrically “hot” when the welder is on. Do eyes from sparks and the rays of the arc when welding or not touch these “hot”...
  • Page 5 SAFETY WELDING AND CUTTING CYLINDER MAY EXPLODE IF SPARKS CAN CAUSE DAMAGED. FIRE OR EXPLOSION. 7.a. Use only compressed gas cylinders containing the correct shielding gas for the process used 6.a. Remove fire hazards from the welding area. If and properly operating regulators designed for this is not possible, cover them to prevent the welding sparks the gas and pressure used.

  • Page 6: Table Of Contents

    LINCOLN ELECTRIC Flextec® 350X Service Manual FLEXTEC® 350X Service Manual Last update: 2018/10/01 FLEXTEC® 350X ............................1 Service Manual................................1 Theory of Operation ..............................3 INPUT SECTION ............................3 SWITCHBOARD AND MAIN TRANSFORMER ....................4 OUTPUT SECTION ............................ 5 CONTROL BOARD ............................ 6 USER INTERFACE (UI) BOARD ........................
  • Page 7 LINCOLN ELECTRIC Flextec® 350X Service Manual 42V DC BUS BOARD TEST PROCEDURE ....................25 AUXILIARY TRANSFORMER (T1) TEST PROCEDURE ................. 28 BOOST RELAY TEST PROCEDURE ......................31 CHOKE TEST PROCEDURE ........................33 FAN AND F.A.N. CIRCUIT TEST PROCEDURE .................... 35 CURRENT TRANSDUCER (LEM) TEST PROCEDURE ...................

  • Page 8: Theory Of Operation

    Figure E.1 – Input section Input Section When the correct three-phase input voltage is applied to the Flextec 350X, via the input line switch, two phases of this AC voltage are applied to the auxiliary transformer and all three phases are applied to the input board.

  • Page 9: Switchboard And Main Transformer

    LINCOLN ELECTRIC Flextec® 350X Service Manual Figure E.2 – Switchboard and main transformer Switchboard and Main Transformer The main function of the switchboard is to receive and process the rectified and filtered primary power received from the input board. The IGBT circuitry on the switchboard is designed to operate from a rectified three-phase input voltage range from 380 VAC to 575 VAC.

  • Page 10: Output Section

    LINCOLN ELECTRIC Flextec® 350X Service Manual Figure E.3 – Output section Output Section The 40KHz. AC output from the main weld winding secondary is applied to the output rectifier bridge. The resultant DC+ power is coupled through an output choke to the positive output terminal. The output choke is an inductor that provides filtering to enhance the arc performance and accurate waveform response.

  • Page 11: Control Board

    The control board also monitors the thermostat and thermistor circuits. This control board controls and monitors the CrossLinc™ circuit and turns on the green LED when the Flextec 350X is connected to the LN25X. The two 42 VDC fans are also controlled by the control board.

  • Page 12: User Interface (Ui) Board

    LINCOLN ELECTRIC Flextec® 350X Service Manual Figure E.5 – User interface (UI) board User Interface (UI) Board The UI board is powered by the 42 VDC received from the 42V DC bus board. LED 5 indicates that the on board power supply is functioning. LED 4 is the ArcLink status indicator.

  • Page 13: Thermal Protection

    Protective Circuits Protective circuits are designed into the Flextec 350X to sense trouble and shut down the machine before damage occurs to the machine’s internal components.

  • Page 14: Crosslinc™ Capability

    Flextec® 350X Service Manual CrossLinc™ Capability The Flextec 350X has the ability to communicate with compatible wire feeders such as the LN25X. The two machines communicate directly over the weld cables by pulsing the OCV voltage and wire feeder current draw.

  • Page 15: Pulse Width Modulation

    LINCOLN ELECTRIC Flextec® 350X Service Manual Figure E.6 – Typical IGBT outputs Pulse Width Modulation The term Pulse Width Modulation is used to describe how much time is devoted to conduction in the positive and negative portions of the cycle. Changing the pulse width is known as modulation. Pulse Width Modulation (PWM) is the varying of the pulse width over the allowed range of a cycle to affect the output of the machine.

  • Page 16: Insulated Gate Bipolar Transistor (Igbt) Operation

    LINCOLN ELECTRIC Flextec® 350X Service Manual Figure E.7 – Insulated gate bipolar transistor (IGBT) operation Insulated Gate Bipolar Transistor (IGBT) Operation An IGBT is a type of transistor. IGBT are semiconductors well suited for high frequency switching and high current applications.

  • Page 17: Troubleshooting & Repair

    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.

  • Page 18: Pc Board Troubleshooting Procedures

    ELECTRIC SHOCK can kill. • If you return a PC board to The Lincoln Electric Company for credit, it must be in the static-shielding bag. This will • Have an electrician install and service this prevent further damage and allow proper failure analysis.

  • Page 19: Troubleshooting Guide

    4. Perform the D1 Rectifier Test Procedure. If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 20 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 21 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 22 If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.

  • Page 23: Using The Status Led To Troubleshoot System Problems

    LINCOLN ELECTRIC Flextec® 350X Service Manual USING THE STATUS LED TO TROUBLESHOOT SYSTEM PROBLEMS Errors are displayed on the user interface. In addition, there are status lights on the User Interface PC board and the Switch PC board that contain error sequences.
  • Page 24 LINCOLN ELECTRIC Flextec® 350X Service Manual from the fan. NOTE: The Fan As Needed circuitry automatically shuts off the fan 5 minutes after welding has stopped. 2. Welding output ratings may have been exceeded. Allow the machine to cool down and reset.

  • Page 25: Test Procedures

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 26 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.1 – Roof mounting screw locations Figure F.2 – Left case side, roof and corner cap mounting screw locations...
  • Page 27 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.3 – Right case side, roof and corner cap mounting screw locations...

  • Page 28: Capacitor Discharge Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 29 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.4 - Input board location Figure F.5 - Input board connections B2 and B1...

  • Page 30: 42V Dc Bus Board Test Procedure

    Procedure. Perform the Capacitor Discharge Procedure. 4. Carefully apply the correct input power to the Flextec 350X and turn on the machine ON. 5. Locate the 42V DC bus board. See Figure F.6. 6. Locate the Green LED on the 42V DC bus board. See Figure F.7.
  • Page 31 LINCOLN ELECTRIC Flextec® 350X Service Manual Table F.1 – 42V DC bus board voltage tests DESCRIPTION TEST POINT TEST POINT EXPECTED READING INPUT FROM D1 PLUG J46 PIN 1 (+) PLUG J46 PIN 3 (-) 46 – 74 VDC RECTIFIER...
  • Page 32 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.7 - 42V DC bus board LED and plug locations Figure F.8 - 42V DC bus board test points...

  • Page 33: Auxiliary Transformer (T1) Test Procedure

    Locate the auxiliary transformer (T1). See Figure F.9. Carefully apply the correct input power to the Flextec 350X and turn ON the machine. Using a digital volt/ohmmeter, test for the correct primary voltages at the input board terminal (leads L1 – L3). See Figure F.10.
  • Page 34 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.9 - Auxiliary transformer (T1) location Figure F.10 - Input board terminal locations...
  • Page 35 LINCOLN ELECTRIC Flextec® 350X Service Manual Table F.2 – Auxiliary transformer (T1) voltage tests DESCRIPTION / PRIMARY TEST POINT TEST POINT EXPECTED SECONDARY VOLTAGE APPLIED TO VOLTAGE L1-L3 380 VAC 49 VAC 440 VAC 57 VAC 460 VAC 59 VAC...

  • Page 36: Boost Relay Test Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 37 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.11 - Boost relay location Figure F.12 - Boost relay terminal and lead locations...

  • Page 38: Choke Test Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 39 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.13 - Choke location...

  • Page 40: Fan And F.a.n. Circuit Test Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 41 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.14 - Control board location Figure F.15 – Control board Plugs J13 and J14 locations...
  • Page 42 LINCOLN ELECTRIC Flextec® 350X Service Manual Table F.4 – Fan voltage tests TEST DESRIPTION TEST POINT TEST POINT CONDITIONS EXPECTED READING BOTTOM FAN PLUG J13 PIN 4 PLUG J13 PIN 3 FAN NOT RUNNING 0 VDC RED WIRE + BLACK WIRE -...

  • Page 43: Current Transducer (Lem) Test Procedure

    Locate plug J11 on the control board. See Figure F.17. See Wiring Diagram. Carefully apply the correct input power to the Flextec 350X and turn the machine ON. Using a digital volt/ohmmeter, carefully check for the DC supply voltages to the current transducer Table F.5.
  • Page 44 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.16 - Current transducer location Figure F.17 - Plug J11 location on control board...
  • Page 45 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.18 - Plug J11 lead locations Table F.5 - DC supply voltages from control board DESCRIPTION TEST POINT (POS) TEST POINT (NEG) EXPECTED READING POSITIVE VOLTAGE SUPPLY PLUG J11 PIN 4 (LEAD 216A) PLUG J11 PIN 9 (LEAD 218A)

  • Page 46: D1 Rectifier Test Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 47 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.19 - D1 rectifier location Figure F.20 - D1 rectifier lead locations and test points...
  • Page 48 LINCOLN ELECTRIC Flextec® 350X Service Manual Table F.7 - D1 rectifier forward voltage drop tests TEST POINT (POS) TEST POINT (NEG) EXPECTED READING TOP AC TERMINAL POSITIVE TERMINAL 0.2 VDC – 0.7 VDC BOTTOM AC TERMINAL POSITIVE TERMINAL 0.2 VDC – 0.7 VDC...

  • Page 49: Thermostat #1 And #2 Circuit Test Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 50 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.21 - Thermostat #1 location Figure F.22 - Thermostat #2 location...
  • Page 51 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.23 - Control board plug J3 location Figure F.24 - Control board plug J3 lead locations...

  • Page 52: Thermistor Test Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 53 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.25 - Control board plug J12 location Figure F.26 - Control board plug J12 lead locations...
  • Page 54 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.27 - Input board terminal B (+) location...

  • Page 55: Output Rectifier Assembly Test Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 56 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.28 - Output rectifier assembly location Figure F.29 - Lead X11 and X12 connection point locations...
  • Page 57 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.30 - Boost board terminal locations Table F.8 - Output rectifier forward voltage drop tests TEST POINT (POS) TEST POINT (NEG) EXPECTED READING RECTIFIER TERMINAL X11 OUTPUT RECTIFIER HEATSINK 0.2 VDC – 0.7 VDC...

  • Page 58: Input Board Test Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 59 LINCOLN ELECTRIC Flextec® 350X Service Manual 2. Using an external 15 VDC power supply, carefully apply 15 VDC to plug J40 pin 4(+) to J40 pin 1(-). This should activate the onboard pre-charge relay (a small click may be heard). See Figure F.32 and F.34.
  • Page 60 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.32 - Input board terminal, LED and plug locations Figure F.33 - Input rectifier positive terminal location...
  • Page 61 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.34 - Plug J40 pin locations Table F.10 - Input rectifier forward voltage drop tests TEST POINT (POS) TEST POINT (NEG) EXPECTED READING TERMINAL A POSITIVE TERMINAL 0.3 VDC – 1.0 VDC TERMINAL B POSITIVE TERMINAL 0.3 VDC –...

  • Page 62: Main Transformer Test Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 63 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.35 - Main transformer location Figure F.36 - Boost relay lead locations...
  • Page 64 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.37 - Output rectifier terminal X11 and X12 locations Figure F.38 - Lead #201 and #204 locations...
  • Page 65 LINCOLN ELECTRIC Flextec® 350X Service Manual Table F.11 – Main transformer resistance tests DESCRIPTION TEST POINT TEST POINT EXPECTED READING BOOST WINDING AND LEAD 10A LEAD #10B VERY LOW RESISTANCE REACTOR (DISCONNECTED FROM (DISCONNECTED FROM (LESS THAN ONE OHM) THE BOOST RELAY)

  • Page 66: Control Board Test Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 67 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.39 - Control board location Figure F.40 - Control board test points...
  • Page 68 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.41 - Control board lead locations Table F.12 - Control board LED tests DESCRIPTION LOCATION MEANING LED 1 CONTROL BOARD +15 VDC SUPPLY ON LED 2 CONTROL BOARD ARCLINK SUPPLY ON LED 1...
  • Page 69 LINCOLN ELECTRIC Flextec® 350X Service Manual Table F.13 - Control board voltage tests DESCRIPTION TEST POINT TEST POINT EXPECTED CONDITIONS (POS) (NEG) READING PRE-CHARGE RELAY PLUG J15 PIN 4 PLUG J11 PIN 9 15 VDC MACHINE ON (LEAD #401) (LEAD #218A)

  • Page 70: Switchboard Test Procedure

    If any of the resistance test results are not as expected, label and disconnect the leads attached to the terminals, perform the Switchboard Removal Procedure and retest. Carefully apply the correct input power to the Flextec 350X and turn ON the machine. Check the LEDs per Table F.15. See Figure F.44...
  • Page 71 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.42 - Switchboard and input board locations Figure F.43 - Input board terminal locations...
  • Page 72 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.44 - Switchboard test point and LED locations Table F.14 – Switchboard diode drop tests DESCRIPTION TEST POINT (POS) TEST POINT (NEG) EXPECTED READING CHECKING “HIGH-SIDE” B3 CONNECTION TO B2 POSITIVE TERMINAL 0.3 TO 1.0 VDC...
  • Page 73 LINCOLN ELECTRIC Flextec® 350X Service Manual Table F.15 - Switchboard LEDs LED NUMBER LED COLOR LED FUNCTION GREEN INDICATES SWITCHBOARD IS RECEIVING PRIMARY VOLTAGE FROM THE INPUT BOARD. GREEN INDICATES SWITCHBOARD IS RECEIVING GATE DRIVE SIGNALS FROM THE CONTROL BOARD.

  • Page 74: User Interface Board Test Procedure

    See Figure F.46 and F.47. See Wiring Diagram. 6. Carefully apply the correct input power to the Flextec 350X and turn ON the machine. 7. Observe and make sure the status LEDs on the front and rear of the user interface board are indicating a properly functioning user interface board.
  • Page 75 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.45 - User interface board location Figure F.46 - User interface board plug and LED locations...
  • Page 76 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.47 - User interface board lead locations Table F.16 - User interface board resistance tests TEST POINT TEST POINT EXPECTED READING PLUG J1 PIN 1 PLUG J1 PIN 6 0 – 3.8K OHMS DEPENDENT ON ARC CONTROL POT POSITION.
  • Page 77 LINCOLN ELECTRIC Flextec® 350X Service Manual Table F.19 - User interface board voltage tests DESCRIPTION TEST POINT (POS) TEST POINT (NEG) EXPECTED CONDITIONS READING INPUT FROM 42V PLUG J4 PIN 4 PLUG J4 PIN 3 42 VDC MACHINE ON DC bus board...

  • Page 78: Special Testing Modes

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 79 Place the #4 DIP switch in the OFF position. 23. Perform the Case Cover Replacement Procedure. CONSTANT CURRENT GRID LOAD TESTING 1. Turn off the Flextec 350X machine. 2. Perform the Case Cover Removal Procedure. Capacitor Discharge Procedure. Perform the Locate the DIP switch on the user interface board.
  • Page 80 21. Place the #4 DIP switch in the OFF position. 22. Perform the Case Cover Replacement Procedure. ERROR LOG READING PROCEDURE 1. Turn off the Flextec 350X machine. 2. Perform the Case Cover Removal Procedure. Perform the Capacitor Discharge Procedure.
  • Page 81 31. Carefully remove the input power from the machine. 32. Place the #8 DIP switch in the OFF position. Perform the Case Cover Replacement Procedure. SOFTWARE VERSION READING PROCEDURE 1. Turn off the Flextec 350X machine. 2. Perform the Case Cover Removal Procedure. Perform the Capacitor Discharge Procedure.
  • Page 82 LINCOLN ELECTRIC Flextec® 350X Service Manual three digits of the user interface main code version. 20. Cycle the local / remote switch until the left display shows “ 16”. The right display will show the last three digits of the user interface parameter version.
  • Page 83 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.49 - User controls locations Figure F.50 - User interface board DIP switch location and position...

  • Page 84: Removal And Replacement Procedures

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 85 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.51 - 42V DC bus board plug locations Figure F.52 - 42V DC bus board mounting nut locations...

  • Page 86: Auxiliary Transformer (T1) Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 87 LINCOLN ELECTRIC Flextec® 350X Service Manual 7. Perform the Case Cover Replacement Procedure. 8. Perform the Retest After Repair Procedure. Figure F.53 - Primary lead connection points...
  • Page 88 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.54 - Lead X2 location Figure F.55 - Auxiliary transformer (T1) mounting hardware locations...

  • Page 89: Boost Relay Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 90 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.56 - Boost relay lead locations Figure F.57 - Boost relay mounting screw locations...

  • Page 91: Choke Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 92 LINCOLN ELECTRIC Flextec® 350X Service Manual 4. Using a 7/16” nutdriver, connect the outer choke lead and lead #220 to the positive output terminal copper bus bar. Apply a thin coating of Penetrox heat sink compound (Lincoln part #T12837-1) between the connection points. See Wiring Diagram.
  • Page 93 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.59 - Positive output terminal copper bus bar location Figure F.60 - Choke mounting screw locations...

  • Page 94: Fan Assembly Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 95 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.61 - Brickwork fan guard mounting screw locations Figure F.62 - Fan assembly mounting screw locations...
  • Page 96 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.63 - Control board plug J13 and J14 locations...

  • Page 97: Current Transducer Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 98 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.64 - Positive output terminal copper bus bar location...

  • Page 99: D1 Rectifier Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 100 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.65 - D1 rectifier lead locations Figure F.66 - D1 rectifier mounting hardware locations...

  • Page 101: Thermostat #1 Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 102 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.67 - Thermostat #1 lead locations Figure F.68 - Thermostat #1 mounting screw locations...

  • Page 103: Output Rectifier Module Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 104 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.69 - Output rectifier mounting hardware locations Figure F.70 - Diode module mounting screw tightening sequence...

  • Page 105: Boost Board Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 106 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.71 - Boost board terminal locations Figure F.72 - Boost board mounting screw locations...

  • Page 107: Input Board Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 108 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.73 - Input board lead locations Figure F.74 - Input board mounting screw locations...

  • Page 109: Main Transformer Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 110 LINCOLN ELECTRIC Flextec® 350X Service Manual REPLACEMENT PROCEDURE 1. Carefully position the new main transformer into the machine. Using a 3/8” nutdriver, attach the two primary leads to the series capacitors. See Wiring Diagram. Using a 5/16” nutdriver, attach the four screws securing the main transformer to the machine base.
  • Page 111 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.76 - Negative output terminal copper bus bar location Figure F.77 - Boost relay lead locations...
  • Page 112 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.78 - Boost board AC terminal location Figure F.79 - Main transformer mounting screw locations...

  • Page 113: Control Board Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 114 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.80 - Control board plug locations Figure F.81 - Control board mounting nut locations...

  • Page 115: Switchboard Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 116 LINCOLN ELECTRIC Flextec® 350X Service Manual Using a 3/8” nutdriver, remove the four nuts securing the switchboard to the mounting studs. See Figure F.86. The switchboard can now be removed and replaced. REPLACEMENT PROCEDURE 1. Carefully position the new switchboard onto it’s mounting studs.
  • Page 117 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.83 - Base and deck mounting screw locations Figure F.84 - Input board terminal B2 location...
  • Page 118 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.85 - Switchboard plug and terminal locations Figure F.86 - Switchboard mounting nut location...

  • Page 119: User Interface Board Removal And Replacement Procedure

    If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
  • Page 120 LINCOLN ELECTRIC Flextec® 350X Service Manual Figure F.87 - User interface board plug locations Figure F.88 - User interface board mounting screw location...

  • Page 121: Retest After Repair

    LINCOLN ELECTRIC Flextec® 350X Service Manual RETEST AFTER REPAIR Testing is required after the removal of any component that could affect the machine’s electrical characteristics or if any electrical components are repaired or replaced. VOLTAGES IDLE WATTS CONDITIONS 380 / 460 / 575...

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