Lincoln Electric INVERTEC SVM129-B Service Manual
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Lincoln Electric INVERTEC SVM129-B Service Manual

Lincoln Electric INVERTEC SVM129-B Service Manual

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RETURN TO MAIN MENU
SVM129-B
OCTOBER, 2006
®
TM
TM
INVERTEC
STT
& STT II
For use with machine code numbers:10151,10152,10153,10309,10381,10382,10383,11090,11091,11092,
11115,11116
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
SAFETY PRECAUTIONS CON-
TAINED THROUGHOUT. And,
most importantly, think before
you act and be careful.
SERVICE MANUAL
Copyright © 2006 Lincoln Global Inc.
• World's Leader in Welding and Cutting Products •
• Sales and Service through Subsidiaries and Distributors Worldwide •
Cleveland, Ohio 44117-1199 U.S.A. TEL: 1-888-935-3877 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com

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Summary of Contents for Lincoln Electric INVERTEC SVM129-B

  • Page 1 RETURN TO MAIN MENU SVM129-B OCTOBER, 2006 ® INVERTEC & STT II For use with machine code numbers:10151,10152,10153,10309,10381,10382,10383,11090,11091,11092, 11115,11116 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: Safety

    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 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.
  • Page 4 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.
  • Page 5 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.

  • Page 6: Table Of Contents

    MASTER TABLE OF CONTENTS FOR ALL SECTIONS RETURN TO MAIN MENU 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 Electrical Diagrams ...Section G STT Parts ...P257 STT II Parts ...P294 INVERTEC STT...
  • Page 7 Section A-1 - INSTALLATION SECTION - Installation ...Section A Technical Specifications (Codes 11092 & Below) ...A-2 Technical Specifications (Codes 11115 & 11116) ...A-3 Location...A-4 Stacking...A-4 Tilting...A-4 Machine Grounding and High Frequency Interference Protection...A-4 Input Connections ...A-4 Supply Connections...A-4 Input Cable Installation and Connection...A-5 Ground Connection...A-5 Input Voltage Reconnect Procedure ...A-6 Output Connections ...A-6...

  • Page 8: Installation

    TECHNICAL SPECIFICATIONS –Invertec STT & STT II (For Codes 11092 and BELOW) STANDARD VOLTAGE 208/230/460/3/60 HZ 200/220/380/415/440/3/50/60 HZ DUTY CYCLE 60% Duty Cycle 100% Duty Cycle CURRENT RANGE Peak Current 0 - 450 Amps Background 0 - 125 Amps RECOMMENDED INPUT WIRE AND FUSE SIZES NPUT VOLTAGE FUSE(SUPER LAG) AND FREQUENCY...
  • Page 9 TECHNICAL SPECIFICATIONS –Invertec STT II (For Codes 11115 AND 11116) STANDARD VOLTAGE 200/208/3/50/60 HZ 200/208/380/400/415/3/50/60 HZ DUTY CYCLE 60% Duty Cycle 100% Duty Cycle CURRENT RANGE Peak Current 0 - 450 Amps Background 0 - 125 Amps RECOMMENDED INPUT WIRE AND FUSE SIZES NPUT VOLTAGE FUSE(SUPER LAG) AND FREQUENCY...

  • Page 10: Location

    Read and understand entire Installation Section before starting installation. WARNING ELECTRIC SHOCK can kill. • Only qualified personnel should perform this installation. • Turn the input power OFF at the disconnect switch or fuse box before installing this equipment. • Turn the power switch on the Invertec STT “OFF”...

  • Page 11: Input Cable Installation And Connection

    INPUT CABLE ENTRY ACCESS & CABLE STRAIN RELIEF INPUT CABLE INSTALLATION AND CON- NECTION A cable strain relief is provided at the supply line entry and is designed to accommodate cable diameters of .310 - 1.070 in. (7.9 - 27.2 mm). On European models the strain relief is designed to accommodate cable diameters of .709 - 1.000 in.

  • Page 12: Input Voltage Reconnect Procedure

    FIGURE A.2 RECONNECT PANEL INPUT VOLTAGE RECONNECT PROCEDURE As shipped from the factory, multiple voltage machines are internally configured for the highest input voltage (440-460 VAC), for Codes 11092 and below and (380- 415 VAC), for Codes 11115 and 11116. 1.
  • Page 13 Section B-1 Section B-1 TABLE OF CONTENTS - OPERATION SECTION - Operation...Section B Safety Precautions ...B-2 General Description ...B-3 Recommended Equipment...B-3 Operating Controls ...B-3 Design Features...B-3 Welding Capability ...B-3 Limitations ...B-3 Operational Features and Controls...B-4 Welding Operation ...B-5 Welding Parameters and Guidelines ...B-6 Recommended Settings for STT II...B-7 INVERTEC STT...

  • Page 14: Operation

    OPERATING INSTRUCTIONS Read and understand entire section before operating machine. GENERAL WARNINGS SAFETY PRECAUTIONS Observe additional Safety Guidelines detailed in the beginning of this manual. OPERATION WARNING ELECTRIC SHOCK can kill. • Do not touch electrically live parts or electrode with skin or wet clothing.

  • Page 15: Operation

    GENERAL DESCRIPTION The Invertec STT II is a 225-ampere inverter based arc welding power source specifically designed for the STT welding process. It is neither a constant current (CC) nor a constant voltage (CV) machine. It is a power source that delivers current of a desired wave form and characteristics that are superior to conventional short circuiting GMAW.

  • Page 16: Operational Features And Controls

    OPERATIONAL FEATURES AND CONTROLS All operator controls are located on the case front of the Invertec STT II. Refer to Figure B.1 for locations. 1. POWER SWITCH: Turns output power ON and OFF. This switch also controls auxiliary power available through the 14-pin Wire Feeder Receptacle.

  • Page 17: Welding Operation

    6. WIRE SIZE SELECT SWITCH: This toggle switch selects between electrode diameters of .035” (1 mm) and smaller or .045” (1.2 mm) and larger. The .035” (1 mm) position provides improved performance of smaller diameter wires at higher wire feed speeds. 7.

  • Page 18: Welding Parameters And Guidelines

    WELDING PARAMETERS AND GUIDE- LINES The Invertec STT II is neither a constant current (CC) nor a constant voltage (CV) power source. In general, wire diameter will be increased one size compared to conventional (CV) power sources. The larger the wire diameter the higher the deposition rate (Up to 1/16”).
  • Page 19 WELDING PROCEDURES FOR STT II - (Steel) Horizontal Fillet (See Table B.1 and B.2) DIRECTION TRAVEL DIRECTION 45° TRAVEL END VIEW Table B.1 100% CO Gas Shield (Set for Steel Mode) Plate Thickness “ (mm) 20 ga (0.9) Electrode size “ (mm) 0.035 (0.9) WFS “/min (m/min)
  • Page 20 NOTES INVERTEC STT...
  • Page 21 Section C-1 Section C-1 TABLE OF CONTENTS - ACCESSORIES - Accessories...Section C Options/Accessories ...C-2 LN-742 Wire Feeder Connection Instructions...C-3 Connection Diagram ...C-4 INVERTEC STT...

  • Page 22: Accessories

    OPTIONS / ACCESSORIES K940 SENSE LEADS: These leads are used to accu- rately sense arc voltage. One set is required for each STT II power source. A 10 ft and 25 ft set are provid- ed as standard with the machine. Additional sets are available in 10 ft (K940-10), 25 ft (K940-25) and 50 ft (K940-50) lengths.
  • Page 23 LN-742 or STT-10 WIRE FEEDER CONNECTION INSTRUCTIONS The LN-742 or STT-10 is the recommended wire feed- er for use with the Invertec STT II. Refer to the LN- 742 or STT-10 Operator Manual for Wire Feed Operation. Refer to Figure C.2 or C.3 and follow the instructions below to connect the LN-742 or STT-10.
  • Page 24 CONNECTION DIAGRAM - INVERTEC STT II WIRE FEEDER REMOTE WORK LEAD ELECTRODE LEAD ELECTRODE SENSE LEAD IS BOLTED TOGETHER WITH ELECTRODE LEAD ON THE WIRE FEEDER CONTACT BLOCK FIGURE C.3 STT-10 to STT II CONNECTION ACCESSORIES WARNING ELECTRIC SHOCK CAN KILL CABLES AND LEADS SHOULD BE TAPED TOGETHER.
  • Page 25 Section D-1 Section D-1 TABLE OF CONTENTS -MAINTENANCE- Maintenance ...Section D Input Filter Capacitor Discharge Procedure...D-2 Preventive Maintenance ...D-3 Major Component Locations ...D-4 INVERTEC STT...
  • Page 26 WARNING Failure to follow this capacitor discharge proce- dure can result in electric shock. INPUT FILTER CAPACITOR DISCHARGE PROCEDURE 1. Turn off input power or disconnect input power lines. 2. Remove hex head screws from side and top of machine and remove wrap-around machine cover.
  • Page 27 PREVENTIVE MAINTENANCE 1. Perform the following preventive mainte- nance procedures at least once every six months. It is good practice to keep a pre- ventive maintenance record; a record tag attached to the machine works best. 2. Remove the machine wraparound cover and perform the input filter capacitor dis- charge procedure (detailed at the begin- ning of this chapter).
  • Page 28 FIGURE D.2 – MAJOR COMPONENT LOCATIONS MAINTENANCE INVERTEC STT 1. BASE ASSEMBLY 2. REAR NAMEPLATE 3. RESISTORS 4. FAN SHROUD ASSEMBLY 5. PROTECTION PC BOARD 6. DRIVER PC BOARD 7. CONTROL BOX 8. CONTROL PC BOARD 9. BLEEDER RESISTORS 10. RECONNECT PANEL 11.
  • Page 29 Section E-1 -THEORY OF OPERATION SECTION- Theory of Operation ...Section E General Description ...E-2 Input Voltage...E-2 Reconnect, Protection Board, Rectification and Precharge ...E-3 Switch Boards...E-4 Main Transformer, Output Rectification and Choke...E-5 Control Board, IGBT Drive and Module...E-6 Power Board ...E-7 Remote Protection Board ...E-7 Field Effect Transistor (FET) Operation...E-8 Pulse Width Modulation ...E-9...

  • Page 30: Theory Of Operation

    THEORY OF OPERATION LINE INPUT SWITCH RECTIFIER "A" LEAD TRANS TRANS LESS THAN 1VDC PWM SIGNAL 15VDC GUN TRIGGER CONTROL BOARD 36VAC BACK- PEAK TAILOUT PEAK GROUND CURRENT CURRENT CONTROL METER METER CONTROL (STT II ONLY) GENERAL DESCRIPTION The Invertec STT is a 225 ampere, inverter based, arc welding power supply specifically designed for the Surface Tension Transfer (STT) welding process.

  • Page 31: Reconnect, Protection Board, Rectification And Precharge

    THEORY OF OPERATION FIGURE E.3 – RECONNECT, PROTECTION BOARD, RECTIFICATION AND PRECHARGE LINE INPUT SWITCH RECTIFIER "A" LEAD TRANS TRANS LESS THAN 1VDC PWM SIGNAL 15VDC GUN TRIGGER CONTROL BOARD 36VAC BACK- PEAK TAILOUT PEAK GROUND CURRENT CURRENT CONTROL METER METER CONTROL (STT II ONLY)

  • Page 32: Switch Boards

    THEORY OF OPERATION LINE INPUT SWITCH RECTIFIER "A" LEAD TRANS TRANS LESS THAN 1VDC PWM SIGNAL 15VDC GUN TRIGGER CONTROL BOARD 36VAC PEAK BACK- TAILOUT PEAK GROUND CURRENT CURRENT CONTROL METER METER CONTROL (STT II ONLY) SWITCH BOARDS There are two switch boards in the Invertec STT, each containing an input filter capacitor.

  • Page 33: Main Transformer, Output Rectification And Choke

    THEORY OF OPERATION FIGURE E.5 – MAIN TRANSFORMER, OUTPUT RECTIFICATION AND CHOKE LINE INPUT SWITCH RECTIFIER "A" LEAD TRANS TRANS LESS THAN 1VDC PWM SIGNAL 15VDC GUN TRIGGER CONTROL BOARD 36VAC PEAK BACK- TAILOUT PEAK GROUND CURRENT CURRENT CONTROL METER METER CONTROL (STT II ONLY)

  • Page 34: Control Board, Igbt Drive And Module

    THEORY OF OPERATION FIGURE E.6 – CONTROL BOARD, IGBT DRIVE AND MODULE LINE INPUT SWITCH RECTIFIER "A" LEAD TRANS TRANS LESS THAN 1VDC PWM SIGNAL 15VDC GUN TRIGGER CONTROL BOARD 36VAC BACK- PEAK TAILOUT PEAK GROUND CURRENT CURRENT CONTROL METER METER CONTROL (STT II ONLY)

  • Page 35: Power Board

    THEORY OF OPERATION FIGURE E.7 – POWER BOARD AND REMOTE PROTECTION BOARD LINE INPUT SWITCH RECTIFIER "A" LEAD TRANS TRANS LESS THAN 1VDC PWM SIGNAL 15VDC GUN TRIGGER CONTROL BOARD 36VAC PEAK BACK- TAILOUT PEAK CURRENT GROUND CURRENT CONTROL METER METER CONTROL (STT II ONLY)

  • Page 36: Field Effect Transistor (Fet) Operation

    THEORY OF OPERATIONS FIGURE E-8 – FIELD EFFECT TRANSISTOR OPERATION SOURCE TERMINAL SOURCE (N) SUBSTRATE (P) SOURCE (N) FIELD EFFECT TRANSISTOR (FET) OPERATION An FET is a type of transistor. FETs are semiconduc- tors well suited for high-frequency switching. Drawing A above shows an FET in a passive mode. There is no gate signal, zero volts relative to the source and, therefore, no current flow.

  • Page 37: Pulse Width Modulation

    THEORY OF OPERATION FIGURE E-9 – TYPICAL FET 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 38: Protective Circuits

    E-10 THEORY OF OPERATION PROTECTIVE CIRCUITS Protective circuits are designed into the Invertec machine to sense trouble and shut down the machine before the trouble damages the internal machine com- ponents. Both overload and thermal protection circuits are included. OVERLOAD PROTECTION The machine is electrically protected from producing abnormally high output currents due to short electrode “stick-out”...
  • Page 39 Section F-1 TROUBLESHOOTING & REPAIR SECTION Troubleshooting & Repair Section ...Section F How to Use Troubleshooting Guide ...F-2 PC Board Troubleshooting Procedures ...F-3 Troubleshooting Guide ...F4 - F-12 Test Procedures ...F-13 T1 Auxiliary Transformer Test...F-13 T4 Auxiliary Transformer Test...F-19 Input Rectifier Test...F-25 Capacitor Balance Test ...F-29 Switch Board Test...F-33 Snubber Resistors Test ...F-37...

  • Page 40: Troubleshooting & Repair Section

    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 41: Pc Board Troubleshooting Procedures

    • 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.

  • Page 42: Troubleshooting Guide

    Wire feeds OK. 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 1-888-935-3877. POSSIBLE AREAS OF...
  • Page 43 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 1-888-935-3877. detailed in the beginning of this manual.
  • Page 44 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 1-888-935-3877. POSSIBLE AREAS OF...
  • Page 45 The thermal indicator light is lit. 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 1-888-935-3877.
  • Page 46 10 minutes. 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 1-888-935-3877. detailed in the beginning of this manual.
  • Page 47 Porosity in the weld. 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 1-888-935-3877. POSSIBLE AREAS OF...
  • Page 48 Weld bead appears "cold." 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 1-888-935-3877. detailed in the beginning of this manual.
  • Page 49 "violent." 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 1-888-935-3877. POSSIBLE AREAS OF...
  • Page 50 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 1-888-935-3877. detailed in the beginning of this manual.

  • Page 51: T1 Auxiliary Transformer Test

    TROUBLESHOOTING & REPAIR T1 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.
  • Page 52 F-14 TROUBLESHOOTING & REPAIR T1 AUXILIARY TRANSFORMER TEST (continued) FIGURE F.1 – T1 AUXILIARY TRANSFORMER AND J30/J31 LOCATION PLUG PLUG T1 AUXILIARY TRANSFORMER TEST PROCEDURE 1. Turn off Invertec STT and disconnect main AC input power to the machine. 2. Using the 5/16" nut driver, remove the case wraparound cover.
  • Page 53 F-15 TROUBLESHOOTING & REPAIR T1 AUXILIARY TRANSFORMER TEST (continued) FIGURE F.2 – PRIMARY LEAD PLUG J21 LOCATION RECONNECT PANEL 5. Locate the primary lead molex plug (J21) just behind the reconnect panel assembly on the right side of the machine. Check for bro- ken or loose wires.
  • Page 54 F-16 TROUBLESHOOTING & REPAIR T1 AUXILIARY TRANSFORMER TEST (continued) 8. If the correct secondary voltages are present (according to Table F.1), the T1 transformer is functioning properly. 9. If the secondary voltages are missing or incorrect, the primary voltages must be checked.
  • Page 55 F-17 TROUBLESHOOTING & REPAIR T1 AUXILIARY TRANSFORMER TEST (continued) WARNING ELECTRIC SHOCK can kill. • With input power ON, there are high voltages inside the machine. Do reach machine or touch any internal part. 15. Apply the correct input power and carefully test for the correct primary voltages at plug J21.
  • Page 56 F-18 F-18 NOTES INVERTEC STT...

  • Page 57: T4 Auxiliary Transformer Test

    TROUBLESHOOTING & REPAIR T4 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 elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 58 F-20 TROUBLESHOOTING & REPAIR T4 AUXILIARY TRANSFORMER TEST (continued) FIGURE F.3 – OUTPUT CHOKE/IGBT MODULE SPLICED CONNECTION LOWER TRAY AREA TEST PROCEDURE 1. Turn off the Invertec STT and disconnect main AC input power to the machine. 2. Using the 5/16" nut driver, remove the case wraparound cover.
  • Page 59 F-21 TROUBLESHOOTING & REPAIR T4 AUXILIARY TRANSFORMER TEST (continued) J1 CURRENT SENSING PLUG LOWER TRAY AREA 5. Disconnect the current sensing Plug J1 from the control PC board. Carefully remove Plug J1 and associated leads from control board compartment. See Figure F.4. PLUG J22 6.
  • Page 60 F-22 TROUBLESHOOTING & REPAIR T4 AUXILIARY TRANSFORMER TEST (continued) MOUNTING BOLTS (5) 7. Carefully lift and tilt the Invertec STT machine onto its right side. See Figure F.6. 8. Using the 7/16" wrench, remove the five bolts holding the lower tray assembly to the case bottom.
  • Page 61 F-23 TROUBLESHOOTING & REPAIR T4 AUXILIARY TRANSFORMER TEST (continued) FIGURE F.8 – T4 TRANSFORMER LEAD CONNECTIONS T4 AUXILIARY TRANSFORMER LEADS 32A, 32B, 33A, 33B 11. Locate and remove leads #32A, #32B and #33A, #33B from the T4 transformer tabs. See Figure F.8. WARNING ELECTRIC SHOCK can kill.
  • Page 62 F-24 TROUBLESHOOTING & REPAIR T4 AUXILIARY TRANSFORMER TEST (continued) TABLE F.2 – T4 AUXILIARY TRANSFORMER VOLTAGES TEST POINTS PLUG J13 PINS 5 TO 6 PLUG J13 PINS 2 TO 3 PLUG J22 PINS 1 TO 2 (LEADS 240 TO 241) PLUG J22 PINS 2 TO 9 (LEADS 241 TO 242) PLUG J22 PINS 3 TO 4...

  • Page 63: Input Rectifier 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 elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 64 F-26 TROUBLESHOOTING & REPAIR INPUT RECTIFIER TEST (continued) FIGURE F.9 - INPUT RECTIFIER LOCATION TEST PROCEDURE 1. Turn off the Invertec STT and disconnect main AC input power to the machine. 2. Using the 5/16" nut driver, remove the case wraparound cover.
  • Page 65 F-27 TROUBLESHOOTING & REPAIR INPUT RECTIFIER TEST (continued) TEST POINTS +PROBE 6. Replace the input rectifier when any of the tests are NOT OK. NOTE: When installing a new input rectifier, torque the mounting nuts (in a cross-tightening pattern) to 6 inch-pounds (.7 Nm). Torque ter- minals to 26 inch-pounds (3 Nm).
  • Page 66 F-28 F-28 NOTES INVERTEC STT...

  • Page 67: Capacitor Balance Test

    TROUBLESHOOTING & REPAIR CAPACITOR BALANCE 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 elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 68 F-30 TROUBLESHOOTING & REPAIR CAPACITOR BALANCE TEST (continued) FIGURE F.10 – SWITCH BOARD TEST POINTS TEST PROCEDURE 1. Turn off the Invertec STT and disconnect main AC input power to the machine. 2. Using the 5/16" nut driver, remove the case wraparound cover.
  • Page 69 F-31 TROUBLESHOOTING & REPAIR CAPACITOR BALANCE TEST (continued) TABLE F.4 – EXPECTED VOLTAGE READINGS If VAC Input is: 460 VAC 440 VAC 415 VAC 380 VAC 5. Adjust the Peak and Background controls to the minimum settings (controls on case front).
  • Page 70 F-32 F-32 NOTES INVERTEC STT...

  • Page 71: Switch Board Test

    F-33 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 elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 72 F-34 TROUBLESHOOTING & REPAIR SWITCH BOARD TEST (continued) FIGURE F.11 - SWITCH BOARD RESISTANCE TEST TEST PROCEDURE NOTE: There are two switch boards. One is located on each side of the machine. NOTE: The switch boards are designed to receive gate (turn-on) signals from the driver board (pulse transformer secondaries).
  • Page 73 F-35 TROUBLESHOOTING & REPAIR SWITCH BOARD TEST (continued) TABLE F.5 – SWITCH BOARD RESISTANCE TEST Apply Positive Apply Negative Test Probe to Test Probe to Terminal Terminal NOTE: K ohm = ohm reading multiplied by 1000. NOTE: Always make sure that switch boards are changed in matched pairs. Never mix an old style (different part number) switch board with a new switch board (new part number).
  • Page 74 F-36 TROUBLESHOOTING & REPAIR SWITCH BOARD TEST (continued) TABLE F.5 – SWITCH BOARD RESISTANCE TEST (continued) Apply Positive Apply Negative Test Probe to Test Probe to Terminal Terminal 401/403 401/403 402/404 402/404 NOTE: K ohm = ohm reading multiplied by 1000. NOTE: Always make sure that switch boards are changed in matched pairs.

  • Page 75: Snubber Resistors Test

    TROUBLESHOOTING & REPAIR SNUBBER RESISTORS 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 elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 76 F-38 TROUBLESHOOTING & REPAIR SNUBBER RESISTORS TEST (continued) TEST PROCEDURE 1. Turn off Invertec STT and disconnect main AC input power to the machine. 2. Using the 5/16" nut driver, remove the case wraparound cover. 3. Perform Input Filter Discharge Procedure.
  • Page 77 F-39 TROUBLESHOOTING & REPAIR SNUBBER RESISTORS TEST (continued) FIGURE F.13 - SWITCH BOARD TEST POINTS 401/403 6. Test for 25 ohms resistance from lead termi- nal 401 to terminal 12 on the switch board. See Figure F.13. a. If 25 ohms is measured, resistor R4 is OK. b.
  • Page 78 F-40 F-40 NOTES INVERTEC STT...

  • Page 79: Power Board Test

    F-41 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 elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 80 F-42 TROUBLESHOOTING & REPAIR POWER BOARD TEST (continued) FIGURE F.14 – REMOVING THE FRONT PANEL ASSEMBLY POWER PC BOARD (Located on Back of Case Front) QUICK CHECK PROCEDURE 1. Turn off the Invertec STT and disconnect main AC input power to the machine. 2.
  • Page 81 F-43 TROUBLESHOOTING & REPAIR POWER BOARD TEST (continued) FIGURE F.15 – POWER PC BOARD TEST POINTS 4. Secure and insulate the front panel assembly for POWER ON testing. WARNING ELECTRIC SHOCK can kill. • With input power ON, there are high voltages inside the machine.
  • Page 82 F-44 TROUBLESHOOTING & REPAIR POWER BOARD TEST (continued) FIGURE F.16 – SIMPLIFIED TRIGGER CIRCUIT POWER BOARD FROM PROTECTION BOARD OVERVOLTAGE T1 AUXILIARY TRANSFORMER #224 3J31 6J22 #503A POWER BOARD #212 2J31 7. Carefully test for 15VDC output from the power PC board at plug J6 pin1 (lead #275) (-) and plug J6 pin 6 (lead #302)(+).

  • Page 83: Protection Board Test

    F-45 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 elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 84 F-46 TROUBLESHOOTING & REPAIR PROTECTION BOARD TEST (continued) FIGURE F.17 – PROTECTION PC BOARD TEST POINTS TEST PROCEDURE 1. Turn off the Invertec STT and disconnect main AC input power to the machine. 2. Using the 5/16" nut driver, remove the case wraparound cover.
  • Page 85 F-47 TROUBLESHOOTING & REPAIR PROTECTION BOARD TEST (continued) FIGURE F.18 - LEADS #309, #309A AT CR1, CR2 RELAYS 309A 7. If the Capacitor Balance Test is OK and more than 5VDC is present at leads #311 to #313 (Step 6), the protection PC board may be faulty.
  • Page 86 F-48 F-48 NOTES INVERTEC STT...

  • Page 87: Trigger Circuit Test

    F-49 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 elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 88 F-50 TROUBLESHOOTING & REPAIR TRIGGER CIRCUIT TEST (continued) PLUG TEST PROCEDURE 1. Turn off the Invertec STT and disconnect main AC input power to the machine. 2. Using the 5/16" nut driver, remove the case wraparound cover. 3. Perform Input Filter Discharge Procedure.
  • Page 89 F-51 TROUBLESHOOTING & REPAIR TRIGGER CIRCUIT TEST (continued) FIGURE F.20 – 14 PIN AMPHENOL AND PLUG J31 PIN ASSIGNMENTS 5. Using the ohmmeter check for approximately 3.5 ohms resistance from pin "D" of the 14 pin amphenol to plug J31 pin 2 (lead #212). See Figure F.20, and Figure F.22, Simplified Trigger Circuit Diagram.
  • Page 90 F-52 TROUBLESHOOTING & REPAIR TRIGGER CIRCUIT TEST (continued) FIGURE F.22 – SIMPLIFIED TRIGGER CIRCUIT DIAGRAM POWER BOARD FROM PROTECTION BOARD OVERVOLTAGE T1 AUXILIARY TRANSFORMER #224 3J31 6J22 #503A POWER BOARD #212 2J31 7. Using the ohmmeter check for continuity (zero ohms) from plug J31 pin 3 (lead#503A) to plug J4 pin 6 (lead#210).

  • Page 91: Igbt Module Removal And Replacement

    TROUBLESHOOTING & REPAIR 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 elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 92 F-54 TROUBLESHOOTING & REPAIR AND REPLACEMENT (continued) FIGURE F.23 – OUTPUT CHOKE LEAD DISCONNECTION LOWER TRAY AREA PROCEDURE 1. Turn off the Invertec STT and disconnect main AC input power to the machine. 2. Using the 5/16" nut driver, remove the case wraparound cover.
  • Page 93 F-55 TROUBLESHOOTING & REPAIR AND REPLACEMENT (continued) FIGURE F.24 – PLUG J1 DISCONNECTION J1 CURRENT SENSING PLUG LOWER TRAY AREA 5. Disconnect the current sensing plug J1 from the control PC board. Carefully remove plug FIGURE F.25 – PLUG J22 DISCONNECTION PLUG J22 6.
  • Page 94 F-56 TROUBLESHOOTING & REPAIR AND REPLACEMENT (continued) FIGURE F.26 – STT PLACED ON ITS RIGHT SIDE MOUNTING BOLTS (5) 7. Carefully lift and tilt the Invertec STT machine onto its right side. See Figure F.26. 8. Using the 7/16" wrench, remove the five bolts holding the lower tray assembly to the case bottom.
  • Page 95 F-57 TROUBLESHOOTING & REPAIR AND REPLACEMENT (continued) FIGURE F.27 – IGBT MODULE CONNECTIONS For steps 14-18, see Figure F.27. 14. Using the phillips head screw driver, remove the small leads from the small "E" and "B" terminals. Note lead placement for reassem- bly.
  • Page 96 F-58 F-58 NOTES INVERTEC STT...

  • Page 97: Switch Board Replacement

    F-59 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 elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 98 F-60 TROUBLESHOOTING & REPAIR SWITCH BOARD REPLACEMENT (continued) FIGURE F.28 – SWITCH BOARD REMOVAL PROCEDURE NOTE: If a test indicates that a switch board is defective, both switch boards must be replaced at the same time. In addition to replacing the switch boards, replace capacitors C1 and C2 if the fol- lowing conditions exist: a.
  • Page 99 F-61 TROUBLESHOOTING & REPAIR SWITCH BOARD REPLACEMENT (continued) 6. Using the 7/16" wrench, remove the two hex head capacitor screws located in the center of the switch board. Hold the board firmly as you remove the screws. 7. Carefully remove the switch board. 8.
  • Page 100 F-62 TROUBLESHOOTING & REPAIR SWITCH BOARD REPLACEMENT (continued) TEST AFTER REPAIR OF SWITCH BOARDS AND/OR CAPACITORS The following test must be performed after the switch boards and/or the capacitors have been replaced. NOTE: Always make sure that switch boards are changed in matched pairs.
  • Page 101 F-63 TROUBLESHOOTING & REPAIR SWITCH BOARD REPLACEMENT (continued) WARNING ELECTRIC SHOCK can kill. • With input power ON, there are high voltages in the machine. into the machine or touch any internal part. 8. With the machine connected for 440/460 volt operation and the proper input voltage applied, turn on input power to the machine.
  • Page 102 F-64 F-64 NOTES INVERTEC STT...

  • Page 103: Capacitor Removal And Replacement Procedure

    CAPACITOR REMOVAL AND REPLACEMENT 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 elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 104 F-66 TROUBLESHOOTING & REPAIR CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) FIGURE F.30 – OUTPUT CHOKE LEAD DISCONNECTION LOWER TRAY AREA PROCEDURE 1. Turn off Invertec STT and disconnect main AC input power to the machine. 2. Using the 5/16" nut driver, remove the case wraparound cover.
  • Page 105 F-67 TROUBLESHOOTING & REPAIR CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) FIGURE F.31 – PLUG J1 DISCONNECTION J1 CURRENT SENSING PLUG LOWER TRAY AREA 5. Disconnect the current sensing plug J1 from the control PC board. Carefully remove plug J1 and associated leads from the control PC board compartment.
  • Page 106 F-68 TROUBLESHOOTING & REPAIR CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) FIGURE F.33 – STT PLACED ON ITS RIGHT SIDE MOUNTING BOLTS (5) 7. Carefully lift and tilt the Invertec STT machine onto its right side. See Figure F.33. 8. Using the 7/16" wrench, remove the five bolts holding the lower tray assembly to the case bottom.
  • Page 107 F-69 TROUBLESHOOTING & REPAIR CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) FIGURE F.34 – REMOVING HEX HEAD NUTS OF THROUGH-BOLTS CAPACITOR REPLACEMENT NOTE: Capacitors must always be replaced in matched sets (C1 and C2 as a set). When replacing Capacitors, remove the entire FET heat sink assembly, including the capacitors and switch board, as a unit.
  • Page 108 F-70 TROUBLESHOOTING & REPAIR CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) FIGURE F.35 – REMOVING THROUGH-BOLTS 15. Place the machine on its side as shown in Figure F.35. Slide the plastic retaining insu- lators that go through the base of the machine to one side.
  • Page 109 F-71 TROUBLESHOOTING & REPAIR CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) FIGURE F.36 – REMOVING CAPACITOR NUTS 17. Remove the two 7/16” hex bolts that hold the capacitor to the switch board. See Figure F.36. FIGURE F.37 – LOOSENING THE CLAMP RING SET SCREW 17.
  • Page 110 F-72 TROUBLESHOOTING & REPAIR CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) FIGURE F.38 – COMPLETE SWITCH BOARD ASSEMBLY READY FOR INSTALLATION 19. Install the new capacitor and tighten the two 7/16” hex bolts to a torque of 55 inch-pounds (6 Nm). Tighten these bolts in increments of 10 inch-pounds, alternating between the two bolts.

  • Page 111: Output Rectifier Removal And Replacement

    TROUBLESHOOTING & REPAIR 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 elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 112 F-74 TROUBLESHOOTING & REPAIR OUTPUT RECTIFIER REMOVAL AND REPLACEMENT (continued) FIGURE F.39 – CHOKE LEAD/HEAT SINK CONNECTION CHOKE LEAD PROCEDURE 1. Turn off Invertec STT and disconnect main AC input power to the machine. 2. Using the 5/16" nut driver, remove the case wraparound cover.
  • Page 113 F-75 TROUBLESHOOTING & REPAIR OUTPUT RECTIFIER REMOVAL AND REPLACEMENT (continued) FIGURE F.40 – MAIN TRANSFORMER DIODE CONNECTIONS 9. Remove the two sleevings from the diode connections at the main transformer. See Figure F.40. 10. Using the 7/16" wrench, remove the diode leads from the main transformer sec- ondary leads.
  • Page 114 F-76 TROUBLESHOOTING & REPAIR OUTPUT RECTIFIER REMOVAL AND REPLACEMENT (continued) FIGURE F.41 – SWITCH BOARD/CAPACITOR ASSEMBLY THROUGH-BOLTS 11. Using the 3/8" nut driver, remove the rear nuts and washers from the switch board/capacitor assembly through-bolts. See Figure F.41. 12. Using the 3/8" nut driver, loosen the front nuts from the switch board/capacitor assembly through-bolts.

  • Page 115: Retest After Repair

    F-77 TROUBLESHOOTING & REPAIR Retest the INVERTEC STT: • If it fails any test and the test requires removing or replacing any mechanical part that could affect the machine's electrical characteristics. • If you repair or replace any electrical components. MAXIMUM INPUT IDLE AMPS AND IDLE WATTS INPUT CURRENT @ IDLE INPUT POWER @ IDLE...
  • Page 116 Corning 3140, 3145, or 738; Columbus Adhesives 0172; or GE RTV-162 is recommended. Sealant may also be purchased from Lincoln Electric (order E2519 Silicone Rubber RTV Coating). Apply sealant after machine is repaired and tested. All five terminals of the input rectifier require this type of sealant.
  • Page 117 Section G-1 Section G-1 TABLE OF CONTENTS - ELECTRICAL DIAGRAMS SECTION - Electrical Diagrams ...Section G Wiring Diagram - Entire Machine - Codes 10151-10153 - (G2773) ....G-2 Wiring Diagram - Entire Machine - Codes 10381-10383 - (G3136) .

  • Page 118: Electrical Diagrams

    Wiring Diagram - Entire Machine - Codes 10151 - 10153 - (G2773) N.F. 7500 309A INPUT RECTIFIER 310A N.H. PROTECTION BOARD RECONNECT N.L. N.F. 7500 LOAD CR2 309A 310A POWER LINE FILTER ASSEMBLY H1 H3 MOTOR 4 AMP LINE SLOW 440- BLOW 460V...

  • Page 119: Wiring Diagram - Entire Machine - Codes 10381-10383 - (G3136

    Wiring Diagram - Entire Machine - Codes 10381 - 10383 - (G3136) N.F. 7500 309A INPUT RECTIFIER 310A N.H. PROTECTION BOARD RECONNECT LOAD N.F. 7500 309A N.K. 310A POWER LINE FILTER ASSEMBLY H1 H3 N.L. MOTOR 4 AMP SLOW 440- BLOW 460V LEFT...

  • Page 120: Wiring Diagram - Entire Machine - Codes 11090-11092 - (G4500

    ELECTRICAL DIAGRAMS Wiring Diagram - Entire Machine - Codes 11090 - 11092 - (G4500) 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. INVERTEC STT &...

  • Page 121: Wiring Diagram - Entire Machine - Codes 11115-11116 - (G4557

    Wiring Diagram - Entire Machine - Codes 11115 - 11116 - (G4557) N.F. 7500 309A INPUT RECTIFIER 310A N.H. PROTECTION BOARD RECONNECT N.L. N.F. 7500 LOAD 309A 310A POWER LINE FILTER ASSEMBLY MOTOR 4 AMP LINE SLOW BLOW N.K. 380- 415V POWER 200-...

  • Page 122: Schematic - Control Pc Board - Codes 10151-11092 - (G2781 Sheet 1

    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. Improper PC board repairs could result in damage to the machine.

  • Page 123: Schematic - Control Pc Board - Codes 10151-11092 - (G2781 Sheet 2

    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. Improper PC board repairs could result in damage to the machine.

  • Page 124: Pc Board Assembly - Control - Codes 10151-11092 - (G2782

    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. Improper PC board repairs could result in damage to the machine.

  • Page 125: Schematic - Control Pc Board - Codes 11115-11116 - (G4649 Sheet 1

    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. Improper PC board repairs could result in damage to the machine.

  • Page 126: Schematic - Control Pc Board - Codes 11115-11116 - (G4649 Sheet 2

    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. Improper PC board repairs could result in damage to the machine.

  • Page 127: Pc Board Assembly - Control - Codes 11115-11116 - (G4648

    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. Improper PC board repairs could result in damage to the machine.

  • Page 128: Schematic - Power Pc Board - All Codes - (M16018

    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. Improper PC board repairs could result in damage to the machine.

  • Page 129: Pc Board Assembly - Power - All Codes - (L8033

    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. Improper PC board repairs could result in damage to the machine.

  • Page 130: Schematic - Darlington Drive Board - Codes 10151-10383 - (M17581

    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. Improper PC board repairs could result in damage to the machine.

  • Page 131: Pc Board Assembly - Darlington Drive - Codes 10151-10383 - (G2778

    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. Improper PC board repairs could result in damage to the machine.

  • Page 132: Schematic - Igbt Drive Board - Codes 11090-11116 - (L12144

    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. Improper PC board repairs could result in damage to the machine.

  • Page 133: Pc Board Assembly - Igbt Drive - Codes 11090-11116 - (L12145

    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. Improper PC board repairs could result in damage to the machine.

  • Page 134: Schematic - Switch Board - All Codes - (L8440

    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. Improper PC board repairs could result in damage to the machine.

  • Page 135: Pc Board Assembly - Switch - All Codes - (L8441

    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. Improper PC board repairs could result in damage to the machine.

  • Page 136: Schematic - Driver Board - All Codes - (S20799

    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. Improper PC board repairs could result in damage to the machine.

  • Page 137: Pc Board Assembly - Driver - All Codes - (L9134

    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. Improper PC board repairs could result in damage to the machine.

  • Page 138: Schematic - Protection Pc Board - Codes 10151-11092 - (M16097

    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. Improper PC board repairs could result in damage to the machine.

  • Page 139: Pc Board Assembly - Protection - Codes 10151-11092 - (L7915

    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. Improper PC board repairs could result in damage to the machine.

  • Page 140: Schematic - Protection Pc Board - Codes 11115-11116 - (M20352

    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. Improper PC board repairs could result in damage to the machine.

  • Page 141: Pc Board Assembly - Protection - Codes 11115-11116 - (L12235

    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. Improper PC board repairs could result in damage to the machine.

  • Page 142: Schematic - Current Sense Pc Board - All Codes - (S21410

    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. Improper PC board repairs could result in damage to the machine.

  • Page 143: Pc Board Assembly - Current Sense - All Codes - (M17591

    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. Improper PC board repairs could result in damage to the machine.

  • Page 144: Schematic - Remote Protection Pc Board - All Codes - (M17609

    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. Improper PC board repairs could result in damage to the machine.

  • Page 145: Pc Board Assembly - Remote Protection - All Codes - (L9657

    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. Improper PC board repairs could result in damage to the machine.

This manual is also suitable for:

Invertec sttInvertec stt ii

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