Page 1 RETURN TO MAIN INDEX SVM129-A January 1998 ® INVERTEC & STT II For use with machine code numbers: 10151 10152 10153 10381 10382 10383 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
SAFETY ARC RAYS can burn. ELECTRIC SHOCK can kill. 3.a. The electrode and work (or ground) circuits 4.a. Use a shield with the proper filter and cover are electrically “hot” when the welder is on. plates to protect your eyes from sparks and Do not touch these “hot”...
Page 4 SAFETY WELDING SPARKS can CYLINDER may explode cause fire or explosion. if damaged. 6.a. Remove fire hazards from the welding area. 7.a. Use only compressed cylinders If this is not possible, cover them to prevent containing the correct shielding gas for the the welding sparks from starting a fire.
Page 5 SAFETY zones où l’on pique le laitier. PRÉCAUTIONS DE SÛRETÉ 6. Eloigner les matériaux inflammables ou les recouvrir afin de Pour votre propre protection lire et observer toutes les instructions prévenir tout risque d’incendie dû aux étincelles. et les précautions de sûreté specifiques qui parraissent dans ce manuel aussi bien que les précautions de sûreté...
Page 6: Table Of Contents
MASTER TABLE OF CONTENTS FOR ALL SECTIONS RETURN TO MAIN INDEX Page Safety ..............................i-iv Installation..........................Section A Technical Specifications ......................A-2 Location............................A-3 Stacking............................A-3 Tilting............................A-3 Machine Grounding and High Frequency Interference Protection..........A-3 Input Connections ........................A-3 Supply Connections......................A-3 Input Cable Installation and Connection................A-4 Ground Connection.......................A-4 Input Voltage Reconnect Procedure ...................A-5 Output Connections ........................A-5 Wire Feeder Output Connections ..................A-5...
Page 7 Section A-1 Section A-1 TABLE OF CONTENTS - INSTALLATION SECTION - Installation ..........................Section A Technical Specifications ......................A-2 Location............................A-3 Stacking............................A-3 Tilting............................A-3 Machine Grounding and High Frequency Interference Protection..........A-3 Input Connections ........................A-3 Supply Connections......................A-3 Input Cable Installation and Connection................A-4 Ground Connection.......................A-4 Input Voltage Reconnect Procedure ...................A-5 Output Connections ........................A-5 Wire Feeder Output Connections ..................A-5 INVERTEC STT...
Page 8: Installation
INSTALLATION TECHNICAL SPECIFICATIONS - INVERTEC STT INPUT - THREE PHASE ONLY STANDARD VOLTAGE INPUT CURRENT AT RATED OUTPUT 208/230/460/3/60 HZ 32/30/19 200/220/380/415/440/3/50/60 HZ 33/30/18/17/16 RATED OUTPUT DUTY CYCLE AMPS VOLTS AT RATED AMPS 60% Duty Cycle 100% Duty Cycle OUTPUT - WELDER AND GENERATOR CURRENT RANGE OPEN CIRCUIT VOLTAGE AUXILIARY POWER...
Page 9: Location
INSTALLATION Read and understand entire Installation Section MACHINE GROUNDING AND HIGH before starting installation. FREQUENCY INTERFERENCE PROTECTION The machine may not be suitable for use in an envi- WARNING ronment where high frequency is present. For exam- ple do not place the machine in close proximity to “TIG” ELECTRIC SHOCK can kill.
Page 10: Input Cable Installation And Connection
INSTALLATION FIGURE A.1 - CASE BACK NAMEPLATE INPUT CABLE ENTRY ACCESS & CABLE STRAIN RELIEF INPUT CABLE INSTALLATION AND GROUND CONNECTION CONNECTION 1. Connect the ground terminal to earth ground per National Electrical Code. A cable strain relief is provided at the supple line entry and is designed to accommodate cable diameters of .310 - 1.070 in.
Page 11: Input Voltage Reconnect Procedure
INSTALLATION FIGURE A.2 - RECONNECT PANEL INPUT VOLTAGE RECONNECT 380 or 415 VAC 1. Open reconnect panel access door on wrap-around. PROCEDURE 2. Move input voltage switch to Voltage = 380 -460V position. As shipped from the factory, multiple voltage (208/230/460 VAC) or (200/220/380 - 415/440 VAC) 3.
Page 12 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-5 Recommended Settings for STT....................B-6 .045"...
Page 13: Operation
OPERATION OPERATING INSTRUCTIONS Read and understand this entire section before operating your Invertec STT. SAFETY INSTRUCTIONS WARNING ELECTRIC SHOCK can kill. • Do not touch electrically live parts or electrode with skin or wet clothing. • Insulate yourself from work and ground.
Page 14: General Description
OPERATION GENERAL DESCRIPTION • Thermostat and FET over current protector prevent overheating from overloads, high ambient tempera- The Invertec STT is a 225-ampere inverter based arc tures, or loss of air flow. welding power source specifically designed for the STT •...
Page 15: Operational Features And Controls
OPERATION FIGURE B.1 - CASE FRONT CONTROLS OPERATIONAL FEATURES AND 3B. PEAK CURRENT DISPLAY METER: This is a digital meter for displaying the CONTROLS preset Peak Current. This meter dis- plays in 1 amp increments. This meter All operator controls are located on the case front of does not indicate actual welding current only the the Invertec STT.
Page 16: Welding Operation
OPERATION 8. THERMAL SHUT-DOWN INDICATOR: 15. ELECTRODE TERMINAL: This twist- This light will indicate that either the internal mate connection is the positive output ter- thermostat(s) or the FET over current sen- minal for connecting an electrode cable to sor has actuated. Machine output will the wire feeder conductor block.
Page 17 OPERATION of the greater heat generated in the 100% CO arc. Adjust Arc Length with Peak Current (100% CO is 35 volts/cm and 100% Argon is 20 volts/cm. 75% Argon, 25% CO is about 24 volts/cm. Contact Tip to Work Distance Note: In 100% CO shielding gas applications the peak current level should be set greater than in a corre-...
Page 18 The serviceability of a product or structure utilizing this type of information is and must be the sole responsibility of the builder/user. Many variables beyond the control of The Lincoln Electric Company affect the results obtained in applying this type of information. These variables include, but are not limited to, welding procedure, plate chem- istry and temperature, weldment design, fabrication methods and service requirements.
Page 19 The serviceability of a product or structure utilizing this type of information is and must be the sole responsibility of the builder/user. Many variables beyond the control of The Lincoln Electric Company affect the results obtained in applying this type of information. These variables include, but are not limited to, welding procedure, plate chem- istry and temperature, weldment design, fabrication methods and service requirements.
Page 20 OPERATION TABLE B.7 - ALL POSITION WELDING .045" BLUE MAX MIG 308LSi Wire Feed Background Tip to Plate Welding Speed Peak Current Current Travel Speed Distance (in) Current Material Size (in/min.) Control Setting Control Setting (in/min.) (approx. AMPS) 3/16" 1/4--5/16 10 ga.
Page 21 B-10 B-10 OPERATION TABLE B.10 - ALL POSITION WELDING 1.2 mm DIN SG 2 WITH CARBON DIOXIDE SHIELDING GAS Wire Feed Background Tip to Plate Welding Material Size Speed Peak Current Current Travel Speed Distance (in) Current (mm) (in/min.) Control Setting Control Setting (in/min.) (approx.
Page 22 The serviceability of a product or structure utilizing this type of information is and must be the sole responsibility of the builder/user. Many variables beyond the control of The Lincoln Electric Company affect the results obtained in applying this type of information. These variables include, but are not limited to, welding procedure, plate chem- istry and temperature, weldment design, fabrication methods and service requirements.
Page 23 The serviceability of a product or structure utilizing this type of information is and must be the sole responsibility of the builder/user. Many variables beyond the control of The Lincoln Electric Company affect the results obtained in applying this type of information. These variables include, but are not limited to, welding procedure, plate chem- istry and temperature, weldment design, fabrication methods and service requirements.
Page 24 B-13 B-13 OPERATION WELDING SETTINGs FOR STT II - (Stainless Steel) Horizontal Fillet (See Table B.19 and B.20) (Steel) Horizontal Fillet (See Table B.17 and B.18) DIRECTION DIRECTION 75° TRAVEL 75° TRAVEL TOP VIEW TOP VIEW DIRECTION 75° 45° TRAVEL DIRECTION 75°...
Page 25 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 INVERTEC STT...
Page 26 ACCESSORIES control board to accept PEAK and BACKGROUND OPTIONS/ACCESSORIES inputs on this connector rather than from the front panel controls. If this short is removed, the front panel controls will be active. By adding a switch SENSE LEADS (K940) - These leads are used to between pins”J”...
Page 27 ACCESSORIES 1. Turn the Invertec STT power off. LN-742 WIRE FEEDER CONNEC- TION INSTRUCTIONS 2. Connect the ARC SENSE LEAD MS connector to the mating connector on STT front panel. The LN-742 is the recommended wire feeder for use 3. Connect the electrode lead (Twist-Mate) to (+) out- with the Invertec STT.
Page 28 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 29: Input Filter Capacitor Discharge Procedure
MAINTENANCE 4. Obtain a high resistance and high wattage resistor WARNING (25-1000 ohms and 25 watts minimum). This resistor is not supplied with machine. NEVER USE ELECTRIC SHOCK can kill. A SHORTING STRAP FOR THIS PROCEDURE. • Failure to follow this capacitor dis- 5.
Page 30: Preventive Maintenance
MAINTENANCE PREVENTIVE MAINTENANCE 4. Examine capacitors for leakage or oozing. Replace if needed. See Figure D.2 for the location of components. 5. Examine wrap-around cover for dents or breakage. 1. Perform the following preventive maintenance pro- Repair as needed. Cover must be kept in good cedures at least once every six months.
Page 31 MAINTENANCE FIGURE D.2 – MAJOR COMPONENT LOCATIONS 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 32: Theory Of Operation .............................................................................................................Section E
Section E-1 Section E-1 TABLE OF CONTENTS -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, Darlington Drive and Module.................E-6 Power Board ..........................E-7 Remote Protection Board ......................E-7 Field Effect Transistor (FET) Operation.................E-8...
Page 33: Theory Of Operation
THEORY OF OPERATION FIGURE E.2 – INPUT VOLTAGE POSITIVE OUTPUT TERMINAL MAIN 1 OHM TRANSFORMER DARLINGTON NEGATIVE CURRENT MODULE OUTPUT SENSOR TERMINAL CHOKE VOLTAGE PRE - SENSING CHARGE LINE INPUT RECEPTACLE SWITCH RECTIFIER REMOTE CURRENT CONTROL TRANS RECEPTACLE "A" LEAD PRE - WIRE CHARGE...
Page 34: Reconnect, Protection Board, Rectification And Precharge
THEORY OF OPERATION FIGURE E.3 – RECONNECT, PROTECTION BOARD, RECTIFICATION AND PRECHARGE POSITIVE OUTPUT TERMINAL MAIN 1 OHM TRANSFORMER DARLINGTON NEGATIVE CURRENT MODULE OUTPUT SENSOR TERMINAL CHOKE VOLTAGE PRE - SENSING CHARGE LINE INPUT RECEPTACLE SWITCH RECTIFIER REMOTE CURRENT CONTROL TRANS RECEPTACLE "A"...
Page 35: Switch Boards
THEORY OF OPERATION FIGURE E.4 – SWITCH BOARDS POSITIVE OUTPUT TERMINAL MAIN 1 OHM TRANSFORMER DARLINGTON NEGATIVE CURRENT MODULE OUTPUT SENSOR TERMINAL CHOKE VOLTAGE PRE - SENSING CHARGE LINE INPUT RECEPTACLE SWITCH RECTIFIER REMOTE CURRENT CONTROL TRANS RECEPTACLE "A" LEAD PRE - WIRE CHARGE...
Page 36: Main Transformer, Output Rectification And Choke
THEORY OF OPERATION FIGURE E.5 – MAIN TRANSFORMER, OUTPUT RECTIFICATION AND CHOKE POSITIVE OUTPUT TERMINAL MAIN 1 OHM TRANSFORMER DARLINGTON NEGATIVE CURRENT MODULE OUTPUT SENSOR TERMINAL CHOKE VOLTAGE PRE - SENSING CHARGE LINE INPUT RECEPTACLE SWITCH RECTIFIER REMOTE CURRENT CONTROL TRANS RECEPTACLE "A"...
Page 37: Control Board, Darlington Drive And Module
THEORY OF OPERATION FIGURE E.6 – CONTROL BOARD, DARLINGTON DRIVE AND MODULE POSITIVE OUTPUT TERMINAL MAIN 1 OHM TRANSFORMER DARLINGTON NEGATIVE CURRENT MODULE OUTPUT SENSOR TERMINAL CHOKE VOLTAGE PRE - SENSING CHARGE LINE INPUT RECEPTACLE SWITCH RECTIFIER REMOTE CURRENT CONTROL TRANS RECEPTACLE "A"...
Page 38: Power Board
THEORY OF OPERATION FIGURE E.7 – POWER BOARD AND REMOTE PROTECTION BOARD POSITIVE OUTPUT TERMINAL MAIN 1 OHM TRANSFORMER DARLINGTON NEGATIVE CURRENT MODULE OUTPUT SENSOR TERMINAL CHOKE VOLTAGE PRE - SENSING CHARGE LINE INPUT RECEPTACLE SWITCH RECTIFIER REMOTE CURRENT CONTROL TRANS RECEPTACLE "A"...
Page 39: Field Effect Transistor (Fet) Operation
THEORY OF OPERATIONS FIGURE E-8 – FIELD EFFECT TRANSISTOR OPERATION GATE TERMINAL DRAIN SOURCE (0 VOLTS) TERMINAL TERMINAL DRAIN (N) SOURCE (N) SUBSTRATE (P) N CHANNEL A. PASSIVE GATE TERMINAL (+ 6 VOLTS) SOURCE (N) DRAIN (N) ELECTRONS B. ACTIVE FIELD EFFECT TRANSISTOR (FET) OPERATION Drawing B above shows the FET in an active mode.
Page 40: Pulse Width Modulation
THEORY OF OPERATION FIGURE E-9 – TYPICAL FET OUTPUTS MINIMUM OUTPUT 24 sec MAXIMUM OUTPUT PULSE WIDTH MODULATION The positive portion of the signal represents one FET group conducting for 1 microsecond. The negative The term PULSE WIDTH MODULATION is used to portion is the other FET group .
Page 41: Protective Circuits
E-10 E-10 THEORY OF OPERATION PROTECTIVE CIRCUITS THERMAL PROTECTION Thermostats protect the machine from excessive oper- Protective circuits are designed into the Invertec ating temperatures. Excessive temperatures may be machine to sense trouble and shut down the machine caused by a lack of cooling air or operating the before the trouble damages the internal machine com- machine beyond the duty cycle and output rating.
Page 42 Section F-1 Section F-1 TABLE OF CONTENTS TROUBLESHOOTING & REPAIR SECTION Troubleshooting & Repair Section ................Section F How to Use Troubleshooting Guide ..................F-2 PC Board Troubleshooting Procedures .................F-3 Troubleshooting Guide ....................F4 - F-12 Test Procedures ........................F-13 T1 Auxiliary Transformer Test..................F-13 T4 Auxiliary Transformer Test..................F-18 Input Rectifier Test......................F-24 Capacitor Balance Test ....................F-27...
Page 43: Troubleshooting & Repair Section
HOW TO USE TROUBLESHOOTING GUIDE WARNING Service and repair should be performed by only Lincoln Electric Factory Trained Personnel. Unauthorized repairs performed on this equipment may result in danger to the technician 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 44: Pc Board Troubleshooting Procedures
• If you return a PC Board to The Lincoln Electric Sometimes machine failures appear to be due to PC Company for credit, it must be in the static-shielding board failures.
Page 45: Troubleshooting Guide
CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353. INVERTEC STT...
Page 46 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216- 383-2531 or 1-800-833-9353. INVERTEC STT...
Page 47 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353. INVERTEC STT...
Page 48 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216- 383-2531 or 1-800-833-9353. INVERTEC STT...
Page 49 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216- 383-2531 or 1-800-833-9353. INVERTEC STT...
Page 50 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353. INVERTEC STT...
Page 51 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216- 383-2531 or 1-800-833-9353. INVERTEC STT...
Page 52 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353. INVERTEC STT...
Page 53 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353. INVERTEC STT...
Page 54: T1 Auxiliary Transformer Test
T1 AUXILIARY TRANSFORMER TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 55 F-14 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 4. Locate the T1 auxiliary transformer and sec- 1. Turn off Invertec STT and disconnect main ondary lead molex plugs (J30 and J31) on AC input power to the machine.
Page 56 F-15 F-15 TROUBLESHOOTING & REPAIR T1 AUXILIARY TRANSFORMER TEST (continued) FIGURE F.2 – PRIMARY LEAD PLUG J21 LOCATION PLUG J21 LOCATION BEHIND RECONNECT PANEL RECONNECT PANEL 5. Locate the primary lead molex plug (J21) 7. Apply the correct input power to the machine just behind the reconnect panel assembly on and test for the correct secondary voltages the right side of the machine.
Page 57 F-16 F-16 TROUBLESHOOTING & REPAIR T1 AUXILIARY TRANSFORMER TEST (continued) 8. If the correct secondary voltages are present 13. Gain access to the primary lead plug J21 by (according to Table F.1), the T1 transformer removing the reconnect panel assembly is functioning properly.
Page 58 F-17 F-17 TROUBLESHOOTING & REPAIR T1 AUXILIARY TRANSFORMER TEST (continued) 15. Apply the correct input power and carefully WARNING test for the correct primary voltages at plug J21. See Table F.1. ELECTRIC SHOCK can kill. 16. If the correct AC input voltages are applied to the primary windings and any or all of the •...
Page 59: T4 Auxiliary Transformer Test
T4 AUXILIARY TRANSFORMER TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 60 F-19 F-19 TROUBLESHOOTING & REPAIR T4 AUXILIARY TRANSFORMER TEST (continued) FIGURE F.3 – OUTPUT CHOKE/DARLINGTON MODULE SPLICED CONNECTION OUTPUT CHOKE/ LOWER DARLINGTON MODULE TRAY SPLICED CONNECTION AREA TEST PROCEDURE WARNING 1. Turn off the Invertec STT and disconnect main AC input power to the machine. ELECTRIC SHOCK can kill.
Page 61 F-20 F-20 TROUBLESHOOTING & REPAIR T4 AUXILIARY TRANSFORMER TEST (continued) FIGURE F.4 – PLUG J1 LOCATION J1 CURRENT SENSING PLUG OUTPUT CHOKE/ LOWER DARLINGTON MODULE TRAY SPLICED CONNECTION AREA 5. Disconnect the current sensing Plug J1 from the control PC board. Carefully remove Plug J1 and associated leads from control board compartment.
Page 62 F-21 F-21 TROUBLESHOOTING & REPAIR T4 AUXILIARY TRANSFORMER TEST (continued) FIGURE F.6 – STT ON ITS RIGHT SIDE MOUNTING BOLTS (5) 7. Carefully lift and tilt the Invertec STT 9. Carefully slide out and support the lower tray machine onto its right side. See Figure F.6. assembly for testing purposes.
Page 63 F-22 F-22 TROUBLESHOOTING & REPAIR T4 AUXILIARY TRANSFORMER TEST (continued) FIGURE F.8 – T4 TRANSFORMER LEAD CONNECTIONS LEADS 32A, 32B, 33A, 33B T4 AUXILIARY TRANSFORMER LEADS T4 AUXILIARY 32A, 32B, 33A, 33B TRANSFORMER STT II 11. Locate and remove leads #32A, #32B and 12.
Page 64 F-23 F-23 TROUBLESHOOTING & REPAIR T4 AUXILIARY TRANSFORMER TEST (continued) TABLE F.2 – T4 AUXILIARY TRANSFORMER VOLTAGES TEST POINTS NORMAL VOLTAGES PLUG J13 PINS 5 TO 6 6VAC PLUG J13 PINS 2 TO 3 10VAC PLUG J22 PINS 1 TO 2 18VAC (LEADS 240 TO 241) PLUG J22 PINS 2 TO 9...
Page 65: Input Rectifier Test
INPUT RECTIFIER TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 66 F-25 F-25 TROUBLESHOOTING & REPAIR INPUT RECTIFIER TEST (continued) FIGURE F.9 - INPUT RECTIFIER LOCATION INPUT RECTIFIER TEST PROCEDURE 4. Locate the input rectifier. See Figure F.9. 5. Locate the leads needed to perform the 1. Turn off the Invertec STT and disconnect tests.
Page 67 F-26 F-26 TROUBLESHOOTING & REPAIR INPUT RECTIFIER TEST (continued) TABLE F.3 – INPUT RECTIFIER TEST TEST POINTS +PROBE -PROBE ACCEPTABLE METER READING Greater than 100K ohms Greater than 100K ohms Greater than 100K ohms Less than 100 ohms Less than 100 ohms Less than 100 ohms Less than 100 ohms Less than 100 ohms...
Page 68: Capacitor Balance Test
CAPACITOR BALANCE TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 69 F-28 F-28 TROUBLESHOOTING & REPAIR CAPACITOR BALANCE TEST (continued) FIGURE F.10 – SWITCH BOARD TEST POINTS L8441 SWITCH TEST PROCEDURE NOTE: This test should only be conducted when the machine reconnect switch and 1. Turn off the Invertec STT and disconnect jumper are set for high voltage (above main AC input power to the machine.
Page 70 F-29 F-29 TROUBLESHOOTING & REPAIR CAPACITOR BALANCE TEST (continued) TABLE F.4 – EXPECTED VOLTAGE READINGS VDC at terminals #9 (+) and #12 (-) If VAC Input is: should be approximately: 460 VAC 325VDC 440 VAC 311VDC 415 VAC 293VDC 380 VAC 269VDC 5.
Page 71: Switch Board Test
SWITCH BOARD TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 72 F-31 F-31 TROUBLESHOOTING & REPAIR SWITCH BOARD TEST (continued) FIGURE F.11 - SWITCH BOARD RESISTANCE TEST TEST PROCEDURE WARNING NOTE: There are two switch boards. One is ELECTRIC SHOCK can kill. located on each side of the machine. • Before continuing with the NOTE: The switch boards are designed to test procedure, perform receive gate (turn-on) signals from the driver...
Page 73 F-32 F-32 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 Test Result Conclusion Repair Action Next Procedure Notes Greater than OK None Continue 1K ohm Less than...
Page 74 F-33 F-33 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 Test Result Conclusion Repair Action Next Procedure Notes 401/403 Greater than OK None Continue 1K ohm...
Page 75: Snubber Resistors Test
SNUBBER RESISTORS TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 76 F-35 F-35 TROUBLESHOOTING & REPAIR SNUBBER RESISTORS TEST (continued) FIGURE F.12 - REMOVING LEADS TEST PROCEDURE 4. Locate and gain access to the switch board. 5. Remove leads from terminals 401/403, 1. Turn off Invertec STT and disconnect main 402/404 on the switch board. See Figure AC input power to the machine.
Page 77 F-36 F-36 TROUBLESHOOTING & REPAIR SNUBBER RESISTORS TEST (continued) FIGURE F.13 - SWITCH BOARD TEST POINTS 402/404 401/403 L8441 SWITCH 6. Test for 25 ohms resistance from lead termi- 7. Repeat the same procedures to test R5, R6, nal 401 to terminal 12 on the switch board. and R7 according to Table F.6.
Page 78: Power Board Test
POWER BOARD TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 79 F-38 F-38 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 OK. If the relays are NOT being activated, the power PC board could be faulty. Continue 1.
Page 80 F-39 F-39 TROUBLESHOOTING & REPAIR POWER BOARD TEST (continued) FIGURE F.15 – POWER PC BOARD TEST POINTS 212A POWER BOARD L8033 211A 4. Secure and insulate the front panel assembly 5. Apply the correct input power and turn ON the for POWER ON testing.
Page 81 F-40 F-40 TROUBLESHOOTING & REPAIR POWER BOARD TEST (continued) FIGURE F.16 – SIMPLIFIED TRIGGER CIRCUIT POWER BOARD CONTROL BOARD #301 11J4 FROM PROTECTION BOARD OVERVOLTAGE #305 REMOTE OUTPUTS TO POWER PROTECTION BOARD BOARD STT II Only T1 AUXILIARY 14 AMPHENOL TRANSFORMER #379 3.5 ohms...
Page 82: Protection Board Test
PROTECTION BOARD TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 83 F-42 F-42 TROUBLESHOOTING & REPAIR PROTECTION BOARD TEST (continued) FIGURE F.17 – PROTECTION PC BOARD TEST POINTS L7915-[ ] PROTECTION TEST PROCEDURE WARNING 1. Turn off the Invertec STT and disconnect ELECTRIC SHOCK can kill. main AC input power to the machine. •...
Page 84 F-43 F-43 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 WARNING more than 5VDC is present at leads #311 to #313 (Step 6), the protection PC board may ELECTRIC SHOCK can kill.
Page 85: Trigger Circuit Test
TRIGGER CIRCUIT TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 86 F-45 F-45 TROUBLESHOOTING & REPAIR TRIGGER CIRCUIT TEST (continued) FIGURE F.19 – PLUG J31 LOCATION PLUG TEST PROCEDURE WARNING 1. Turn off the Invertec STT and disconnect main ELECTRIC SHOCK can kill. AC input power to the machine. • Before continuing with the 2.
Page 87 F-46 F-46 TROUBLESHOOTING & REPAIR TRIGGER CIRCUIT TEST (continued) FIGURE F.20 – 14 PIN AMPHENOL AND PLUG J31 PIN ASSIGNMENTS PLUG J31 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 88 F-47 F-47 TROUBLESHOOTING & REPAIR TRIGGER CIRCUIT TEST (continued) FIGURE F.22 – SIMPLIFIED TRIGGER CIRCUIT DIAGRAM POWER BOARD CONTROL BOARD #301 11J4 FROM PROTECTION BOARD OVERVOLTAGE #305 REMOTE OUTPUTS TO POWER PROTECTION BOARD BOARD STT II Only T1 AUXILIARY 14 AMPHENOL TRANSFORMER #379 3.5 ohms...
Page 89: Darlington Module Removal And Replacement
REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 90 F-49 F-49 TROUBLESHOOTING & REPAIR DARLINGTON MODULE REMOVAL AND REPLACEMENT (continued) FIGURE F.23 – OUTPUT CHOKE LEAD DISCONNECTION OUTPUT CHOKE/ LOWER DARLINGTON MODULE TRAY SPLICED CONNECTION AREA PROCEDURE 4. Locate the lead connection splice from the 1. Turn off the Invertec STT and disconnect main output choke to the Darlington module.
Page 91 F-50 F-50 TROUBLESHOOTING & REPAIR DARLINGTON MODULE REMOVAL AND REPLACEMENT (continued) FIGURE F.24 – PLUG J1 DISCONNECTION J1 CURRENT SENSING PLUG OUTPUT CHOKE/ LOWER DARLINGTON MODULE TRAY SPLICED CONNECTION AREA 5. Disconnect the current sensing plug J1 from J1 and associated leads from the control PC the control PC board.
Page 92 F-51 F-51 TROUBLESHOOTING & REPAIR DARLINGTON MODULE REMOVAL AND REPLACEMENT (continued) FIGURE F.26 – STT PLACED ON ITS RIGHT SIDE MOUNTING BOLTS (5) 7. Carefully lift and tilt the Invertec STT 11. Using 1/2" wrench, remove machine onto its right side. See Figure F.26. Darlington cable from the negative output terminal.
Page 93 F-52 F-52 TROUBLESHOOTING & REPAIR DARLINGTON MODULE REMOVAL AND REPLACEMENT (continued) FIGURE F.27 – DARLINGTON MODULE CONNECTIONS DARLINGTON MODULE STT II For steps 14-18, see Figure F.27. lead and the smaller #289 lead to the large "E" terminal. Torque to 26 inch pounds. 14.
Page 94: Switch Board Replacement
REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 95 F-54 F-54 TROUBLESHOOTING & REPAIR SWITCH BOARD REPLACEMENT (continued) FIGURE F.28 – SWITCH BOARD REMOVAL SOCKET HEAD SCREWS PROCEDURE WARNING NOTE: If a test indicates that a switch board is ELECTRIC SHOCK can kill. defective, both switch boards must be replaced at the same time.
Page 96 F-55 F-55 TROUBLESHOOTING & REPAIR SWITCH BOARD REPLACEMENT (continued) 6. Using the 7/16" wrench, remove the two hex 13. Torque both sets of screws in 10 inch-pound head capacitor screws located in the center increments. Use a diagonal tightening of the switch board. Hold the board firmly as sequence.
Page 97 F-56 F-56 TROUBLESHOOTING & REPAIR SWITCH BOARD REPLACEMENT (continued) TEST AFTER REPAIR OF SWITCH 3. Connect a shorting conductor across termi- nals 14 and 53 of the protection PC board. BOARDS AND/OR CAPACITORS See Figure F.29. The following test must be performed after the 4.
Page 98 F-57 F-57 TROUBLESHOOTING & REPAIR SWITCH BOARD REPLACEMENT (continued) 9. With the output free of a load, check open cir- WARNING cuit voltages of the output. Voltage should be 85 VDC maximum. ELECTRIC SHOCK can kill. 10. Remove input power. Then remove the •...
Page 99: Capacitor Removal And Replacement Procedure
REPLACEMENT PROCEDURE WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 100 F-59 F-59 TROUBLESHOOTING & REPAIR CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) FIGURE F.30 – OUTPUT CHOKE LEAD DISCONNECTION OUTPUT CHOKE/ LOWER DARLINGTON MODULE TRAY SPLICED CONNECTION AREA PROCEDURE WARNING 1. Turn off Invertec STT and disconnect main AC ELECTRIC SHOCK can kill. input power to the machine.
Page 101 F-60 F-60 TROUBLESHOOTING & REPAIR CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) FIGURE F.31 – PLUG J1 DISCONNECTION J1 CURRENT SENSING PLUG OUTPUT CHOKE/ LOWER DARLINGTON MODULE TRAY SPLICED CONNECTION 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 102 F-61 F-61 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 11. Using 1/2" wrench, remove machine onto its right side. See Figure F.33. Darlington cable from the negative output terminal.
Page 103 F-62 F-62 TROUBLESHOOTING & REPAIR CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) FIGURE F.34 – REMOVING HEX HEAD NUTS OF THROUGH-BOLTS HEX NUT CAPACITOR REPLACEMENT Disassemble and reassemble only one unit at a time. Use the other unit as a model during NOTE: Capacitors must always be replaced in reassembly so that all parts are reinstalled prop- matched sets (C1 and C2 as a set)).
Page 104 F-63 F-63 TROUBLESHOOTING & REPAIR CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) FIGURE F.35 – REMOVING THROUGH-BOLTS PLASTIC RETAINING INSULATORS 15. Place the machine on its side as shown in 16. Remove the switch board and capacitor Figure F.35. Slide the plastic retaining insu- assembly from the machine.
Page 105 F-64 F-64 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 18. Loosen the set screw of the capacitor clamp capacitor to the switch board. See Figure ring and remove the capacitor from the clamp F.36.
Page 106 F-65 F-65 TROUBLESHOOTING & REPAIR CAPACITOR REMOVAL AND REPLACEMENT PROCEDURE (continued) FIGURE F.38 – COMPLETE SWITCH BOARD ASSEMBLY READY FOR INSTALLATION INSULATOR 19. Install the new capacitor and tighten the two INPUT FILTER CAPACITOR CONDITIONING 7/16” hex bolts to a torque of 55 inch-pounds If the machine will not produce output when (6 Nm).
Page 107: Output Rectifier Removal And Replacement
REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid elec- trical shock, please observe all safety notes and precautions detailed throughout this manual.
Page 108 F-67 F-67 TROUBLESHOOTING & REPAIR OUTPUT RECTIFIER REMOVAL AND REPLACEMENT (continued) FIGURE F.39 – CHOKE LEAD/HEAT SINK CONNECTION HEAT SINK TAB CHOKE LEAD PROCEDURE 4. Using the slot head screw driver, loosen the input cable strain relief. 1. Turn off Invertec STT and disconnect main 5.
Page 109 F-68 F-68 TROUBLESHOOTING & REPAIR OUTPUT RECTIFIER REMOVAL AND REPLACEMENT (continued) FIGURE F.40 – MAIN TRANSFORMER DIODE CONNECTIONS MAIN TRANSFORMER SECONDARY LEADS 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 110 F-69 F-69 TROUBLESHOOTING & REPAIR OUTPUT RECTIFIER REMOVAL AND REPLACEMENT (continued) FIGURE F.41 – SWITCH BOARD/CAPACITOR ASSEMBLY THROUGH-BOLTS THROUGH-BOLTS 11. Using the 3/8" nut driver, remove the rear 17. Before mounting the new diode sets, clean nuts and washers from the switch and brighten the mounting surfaces of board/capacitor assembly through-bolts.
Page 111: Retest After Repair
F-70 F-70 TROUBLESHOOTING & REPAIR RETEST AFTER 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 3.5 AMPS...
Page 112: Input Filter Capacitor Conditioning
0172; or GE RTV-162 is recommended. Sealant may Power has not been applied to the machine for a also be purchased from Lincoln Electric (order E2519 long period of time (many months). Then. . . Silicone Rubber RTV Coating). Apply sealant after The Input Filter Capacitor Protection Circuit could have machine is repaired and tested.
Page 113 ELECTRICAL DIAGRAMS TABLE OF CONTENTS ELECTRICAL DIAGRAMS SECTION Electrical Diagrams Section...................Section G Wiring Diagram........................G-2 Control PC Board (G2782) Schematic 1 of 2................G-3 Control PC Board (G2782) Schematic 2 of 2...............G-4 Control PC Board (G2782) Layout ..................G-5 Power Board (L8033) Schematic ..................G-6 Power Board (L8033) Layout....................G-7 Darlington Drive Board (G2778) Schematic................G-8 Darlington Drive Board (G2778) Layout ................G-9...
Page 114 NOTES INVERTEC STT...
Page 115: Electrical Diagrams Section
ELECTRICAL DIAGRAMS Wiring Diagram WIRING DIAGRAM - INVERTEC STT REMOTE PROTECTION BOARD TOROIDAL N.L. CORE N.G. 2 0 / 4 0 0 + ARC 4, 5 289B 288B 402, 404 VOLTAGE N.F. SWITCH SENSE 2 3 0 0 W BOARD MAIN 289A 288A...
Page 116: Control Pc Board (G2782) Schematic 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 117: Control Pc Board (G2782) Schematic 2
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician.
Page 118: Control Pc Board (G2782) Layout
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 119: Power Board (L8033) Schematic
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 120: Power Board (L8033) Layout
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 121: Darlington Drive Board (G2778) Schematic
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 122: Darlington Drive Board (G2778) Layout
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 123: Switch Board (L8441) Schematic
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 124: Switch Board (L8441) Layout
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 125: Driver Board (L9134) Schematic
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 126: Driver Board (L9134) Layout
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 127: Protection Board (L7915) Schematic
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 128: Protection Board (L7915) Layout
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 129: Current Sense Board (M17591) Schematic
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 130: Current Sense Board (M17591) Layout
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 131: Remote Protection Board Schematic
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result INVERTEC STT in danger to the Machine Operator or Technician.
Page 132 G-19 G-19 ELECTRICAL DIAGRAMS Wiring Diagram WIRING DIAGRAM - INVERTEC STT II N.L. REMOTE PROTECTION BOARD TOROIDAL CORE N.G. 2 0 / 4 0 0 + ARC 4, 5 289B 288B 402, 404 VOLTAGE N.F. SWITCH SENSE 2 3 0 0 W BOARD MAIN 289A...

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