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Lincoln Electric PRO-CUT 25 Service Manual

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See also: Operator's Manual
SVM149-A
April, 2000
™
PRO-CUT
25
For use with machine code numbers 10661
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

• World's Leader in Welding and Cutting Products •
• Sales and Service through Subsidiaries and Distributors Worldwide •
Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com

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Summary of Contents for Lincoln Electric PRO-CUT 25

  • Page 1: Service Manual

    SVM149-A April, 2000 ™ PRO-CUT For use with machine code numbers 10661 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: Electric Shock Can Kill

    SAFETY WARNING PLASMA CUTTING or GOUGING can be hazardous. PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH. KEEP CHILDREN AWAY. PACEMAKER WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING. Read and understand the following safety highlights. For additional safety information it is strongly recommended that you pur- chase a copy of “Safety in Welding &...
  • Page 3 SAFETY 4.g. Sparks and spatter are thrown from the plasma arc. Wear safe- PLASMA ARC can injure. ty glasses, ear protection and oil free protective garments such as leather gloves, heavy shirt, cuffless trousers, high shoes and a cap over your hair. Wear ear plugs when cutting or goug- 7.a.

  • Page 4: Safety

    4. Garder tous les couvercles et dispositifs de sûreté à leur place. talons sans revers, et chaussures montantes. 5. Toujours porter des lunettes de sécurité dans la zone de soudage. Utiliser des lunettes avec écrans lateraux dans les zones où l’on pique le laitier. Mar. ‘93 PRO-CUT 25...

  • Page 5: Table Of Contents

    Suggestions For Extra Utility From The Pro-Cut System ............B-7 Accessories ..........................Section C Maintenance .........................Section D Theory of Operation ......................Section E Troubleshooting and Repair....................Section F How to Use Troubleshooting Guide....................F-2 Troubleshooting Guide ........................F-4 Test Procedures ..........................F-9 Replacement Procedures ......................F-29 Electrical Diagrams ......................Section G Parts Manual ........................P-357 Series PRO-CUT 25...
  • Page 6 NOTES PRO-CUT 25...
  • Page 7 Section A-1 TABLE OF CONTENTS - INSTALLATION SECTION - Installation Technical Specifications ......................A-2 Safety Precautions........................A-3 Select Proper Location .......................A-3 Stacking ............................A-3 Tilting ............................A-3 High Frequency Interference Protection..................A-3 Input Electrical Connections.......................A-3 Gas Input Connections.......................A-4 Output Connections ........................A-4 Torch .............................A-4 PRO-CUT 25...

  • Page 8: Installation

    INSTALLATION TECHNICAL SPECIFICATIONS - PRO-CUT 25 (K1756-1) INPUT - SINGLE PHASE / 60 HERTZ ONLY Standard Voltage 1Ø Input Current at Rated Output 115/230/1/50/60Hz 115 V : 15 A @ 20% 115 V : 26.7A@ 60% 115 V : 37.7A@ 35%...

  • Page 9: Safety Precautions

    A source of clean, dry air or nitrogen must be supplied INPUT ELECTRICAL to the PRO-CUT 25. Oil in the air is a severe problem CONNECTIONS and must be avoided. The supply pressure must be between 80 and 150 psi. The flow rate is approximate- ly 4.0 cfm (113 l/min.).

  • Page 10: Gas Input Connections

    INSTALLATION NOTE: Oil in the air supply to the PRO-CUT 25 can securely. WARNING: Failure to wire as instructed may cause severe problems. Use only a clean air cause personal injury or damage to equipment. To be supply. installed or checked by an electrician or qualified per- son only.
  • Page 11 Operational Features and Controls ....................B-3 Design Features and Advantages....................B-3 Cutting Capability ........................B-4 Consumable Life.........................B-4 Limitations...........................B-5 Controls and Settings .........................B-5 Pilot Arc Discussion ........................B-6 Procedure Recommendations ....................B-7 General ..........................B-7 Suggestions for Extra Utility From the Pro-Cut System ............B-7 PRO-CUT 25...

  • Page 12: Operation

    FUMES AND GASES can be dangerous. The PRO-CUT 25 initiates the plasma arc with a sim- • Keep your head out of fumes. ple, yet reliable, touch start mechanism. This system eliminates many of the failure problems associated •...

  • Page 13: Operational Features And Controls

    CONTROLS - Latching Parts-in-Place mechanism. Requires the operator to turn the machine off and then on to reset. The PRO-CUT 25 comes with an ON/OFF POWER SWITCH, OUTPUT CURRENT CONTROL, and - Preflow/Postflow timing. Preflow is eliminated if arc PURGE BUTTON.

  • Page 14: Cutting Capability

    CUTTING CAPABILITY The PRO-CUT 25 is rated at 25 amps, at 35% duty cycle on a 10 minute basis. If the duty cycle is exceeded, a thermal protector will shut off the output of the machine until it cools to the normal operating temperature.

  • Page 15: Limitations

    Do not exceed output current and duty cycle rating of - Adjust the gas regulator for 65 PSI for 15’ or 25’ machine. Do not use the PRO-CUT 25 for pipe thaw- torches. ing.

  • Page 16: Pilot Arc Discussion

    The maximum wear depth of the elec- trode is approximately .062”. A green and erratic arc will indicate definite electrode failure and the electrode should be replaced immediately. • Replace the nozzle when the orifice exit is eroded away or oval shaped. PRO-CUT 25...

  • Page 17: Procedure Recommendations

    PRO-CUT System: to the torch or reduce cut quality. WARNING ELECTRIC SHOCK CAN KILL. • Turn off machine at the disconnect switch on the front of the machine before tightening, cleaning or replacing consumables. ---------------------------------------------------------------------------- PRO-CUT 25...
  • Page 18 NOTES PRO-CUT 25...
  • Page 19 Section C-1 Section C-1 TABLE OF CONTENTS - ACCESSORIES - Accessories...........................Section C Options/Accessories........................C-2 PRO-CUT 25...

  • Page 20: Accessories

    ACCESSORIES VORTECH™ NOZZLES The following options/accessories are available for your PRO-CUT 25 from your local Lincoln Distributor. • Only Genuine Lincoln Electric consumables yield the best cutting performance for the PRO-CUT 25. S22147-028 - VORTECH™ nozzle with an .028” (0.7 •...
  • Page 21 Section D-1 Section D-1 TABLE OF CONTENTS -MAINTENANCE- Maintenance .........................Section D Input Filter Capacitor Discharge Procedure ................D-2 Routine Maintenance........................D-3 Periodic Maintenance .........................D-3 Thermal Protection ........................D-3 Replacement Of Internal Fuse....................D-3 Major Component Locations .....................D-4 PRO-CUT 25...

  • Page 22: Maintenance

    DISCHARGE PROCEDURE NOT TOUCH CAPACITOR TERMINALS WITH YOUR BARE HANDS. Repeat the discharge procedure for the other 1. Remove input power to the PRO-CUT 25 machine. capacitors. 2. Remove carrying handle using a 4mm allen wrench. 10. Check the voltage across the terminals of all capacitors with a DC voltmeter.

  • Page 23: Routine Maintenance

    - Printed circuit boards and heat sinks REPLACEMENT OF INTERNAL FUSE - Power switch The PRO-CUT 25 has additional protection provided to 3. Examine the sheet metal case for dents or break- some circuits through an internal fuse. For replace- age.

  • Page 24: Major Component Locations

    MAINTENANCE FIGURE D.2 – MAJOR COMPONENT LOCATIONS 1. Central Metal Wall 2. Main Board 3. Input Board 4. Control Board 5. Fan 6. Case Wraparound 7. Torch PRO-CUT 25...
  • Page 25 Control Board ..........................E-6 Protection Circuits ........................E-7 Overload Protection......................E-7 Thermal Protection .......................E-7 Accidental Operation Protection....................E-7 Safety Parts-In-Place Protection ....................E-7 Insulated Gate Bipolar Transistor (IGBT) Operation ..............E-8 FIGURE E.1 – PRO-CUT 25 BLOCK LOGIC DIAGRAM WORK CLAMP Q1a,b,c Lout IRG4BC30W 240uH +12VDC TRANSFER...

  • Page 26: Theory Of Operation

    GENERAL DESCRIPTION INPUT LINE VOLTAGE, AND AUXILIARY TRANSFORMER The PRO-CUT 25 is an inverter based constant current, continuous control plasma cutting power The single-phase input power of 115 230 Volts AC is source. The control system has a safety mechanism...

  • Page 27: Precharge And Protection

    When the filter capacitors are fully charged they act as power supplies for the IGBT switching circuit. The IGBTs supply the main trans- former primary winding with DC current flow. NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion. PRO-CUT 25...

  • Page 28: Main Transformer

    This signal and the control circuits limit the maximum primary current flow through the IGBTs. The pair of IGBT’s are fired at 15 microsecond intervals, creating a constant 66.6KHz output. PRO-CUT 25...
  • Page 29 This appears as a pilot arc, which can then be to focus the arc. A small, precise hole in the end of the transferred for cutting. nozzle constricts the arc and increases the current density. As the air enters the torch head, it is directed PRO-CUT 25...

  • Page 30: Control Board

    The control board receives status and analog The display board, directly connected to the control feedback signals from the inverter board, input board, board, communicates PRO-CUT 25 status and and various sensors. The control circuitry interprets operating conditions to the user. There are four status...

  • Page 31: Protection Circuits

    PROTECTION will prevent machine output. The PRO-CUT 25 has protection circuits to detect the THERMAL PROTECTION proper connection of the torch and the proper installation of the consumables. If an error is detected...

  • Page 32: Insulated Gate Bipolar Transistor (Igbt) Operation

    OFF position. FIGURE E.5 – IGBT POSITIVE VOLTAGE APPLIED GATE GATE SOURCE SOURCE BODY REGION BODY REGION DRAIN DRIFT REGION DRAIN DRIFT REGION BUFFER LAYER BUFFER LAYER INJECTING LAYER INJECTING LAYER DRAIN DRAIN A. PASSIVE B. ACTIVE PRO-CUT 25...
  • Page 33 Torch Continuity and Solenoid Test ................F-24 Air/Gas Solenoid Test....................F-27 Replacement Procedures Control Board Removal and Replacement ..............F-29 Input Board Removal and Replacement...............F-33 Main Inverter Board Removal and Replacement ............F-37 Switch Removal and Replacement ................F-41 Fan Removal and Replacement ..................F-43 Retest after Repair ......................F-46 PRO-CUT 25...

  • Page 34: Troubleshooting And Repair

    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 35 • 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 36: Troubleshooting Guide

    Replace. CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353(WELD). PRO-CUT 25...
  • Page 37 65psi. CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353(WELD). PRO-CUT 25...
  • Page 38 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353(WELD). PRO-CUT 25...
  • Page 39 Board Test. CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353(WELD). PRO-CUT 25...
  • Page 40 CAUTION If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353(WELD). PRO-CUT 25...

  • Page 41: Input Filter Capacitor Discharge Procedure

    INPUT FILTER CAPACITOR DISCHARGE PROCEDURE WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 42 Hold the resistor in place for 10 seconds. DO NOT TOUCH CAPACITOR TERMINALS WITH YOUR DISCHARGE PROCEDURE BARE HANDS. 1. Remove input power to the PRO-CUT 25 machine. 9. Repeat the discharge procedure for the other capacitors. 2. Remove carrying handle using a 4mm allen wrench.

  • Page 43: Main Inverter Board Resistance Test

    MAIN INVERTER BOARD RESISTANCE 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 44 Inverter Board should be replaced. plastic from around pressure regulator located on the top of the machine. 7. Check the input rectifier bridge (P1) for shorts or opens. See Figure F.2 4. Using a 7mm nut driver, remove the case wraparound. PRO-CUT 25...
  • Page 45 Note: These devices will usually fail “short”resulting in a zero or very low resistance reading. If they “open” physical damage should be evident. FIGURE F.3 LOCATION OF IGBT LEAD 2 (NZL) LEAD 3 (EL) Plug J1 IGBT’s Harness Plug RIGHT SIDE OF MACHINE PRO-CUT 25...
  • Page 46 See the Wiring Diagram. Figure F.4 LEAD 2 (NZL) LEAD 3 (EL) Plug J1 Harness Plug RIGHT SIDE OF MACHINE D1, D2, & D3 PRO-CUT 25...
  • Page 47 This verifies that the pilot arc circuit is complete. See the Wiring Diagram. Figure F.5 LEAD 2 (NZL) LEAD 3 (EL) Plug J1 Harness Plug RIGHT SIDE OF MACHINE PRO-CUT 25...
  • Page 48 F-16 F-16 NOTES PRO-CUT 25...

  • Page 49: Input Board Voltage Test

    INPUT BOARD VOLTAGE TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.

  • Page 50: Test Procedures

    F-18 F-18 TROUBLESHOOTING & REPAIR INPUT BOARD VOLTAGE TEST (CONTINUED) TEST PROCEDURE 8. Apply 115VAC input to the PRO-CUT 25 1. Remove input power to the PRO-CUT 25 machine. The test should be performed machine. with 115VAC applied. Not 230VAC.
  • Page 51 12. Check for the presence of approximately 15VAC at pins 1 and 2 of plug CN1. See Figure F.7. Figure F.7 Input Board Test Points Leads 1 2 3 4 5 6 7 8 PLUG CN1 PRO-CUT 25...
  • Page 52 F-20 F-20 NOTES PRO-CUT 25...

  • Page 53: Main Inverter Board Voltage Test

    MAIN INVERTER BOARD VOLTAGE TEST WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 54 MAIN INVERTER BOARD VOLTAGE TEST (CONTINUED) TEST PROCEDURE 7. Apply the correct input power to the 1. Remove input power to the PRO-CUT Pro-Cut 25 machine. (115VAC or 25 machine. 230VAC) 2. Remove carrying handle using a 4mm 8. Carefully test for approximately 300VDC allen wrench.
  • Page 55 If it is not correct the control board or associated wiring may be faulty. See the Wiring Diagram. See Figure F.9. Figure F.9 Test Points LEAD 2 (NZL) LEAD 3 (EL) Plug J1 Harness Plug RIGHT SIDE OF MACHINE PRO-CUT 25...

  • Page 56: Torch Continuity And Solenoid Test

    TORCH CONTINUITY AND SOLENOID 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 57 Plug J1 Harness Plug TEST PROCEDURE 5. Perform the Capacitor Discharge 1. Remove input power to the PRO-CUT 25 Procedure. machine. 6. Remove Plug J1, Lead #2, and Lead #3 from 2. Remove carrying handle using a 4mm allen the Main Inverter Board. See Figure F.10 wrench.
  • Page 58 9. With connector J1 disconnected from the P.C. Board carefully apply the 12 VDC supply to 10. Replace leads and plugs previously the electrode solenoid. (positive to Plug J1 removed. Pin #4 and Negative to Pin #3). The electrode PRO-CUT 25...

  • Page 59: Air/Gas Solenoid Test

    AIR/GAS SOLENOID 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 60 FIGURE F.12 – AIR SOLENOID Air Solenoid LEFT SIDE OF MACHINE TEST PROCEDURE 7. Check the coil resistance of the solenoid at 1. Remove input power to the PRO-CUT 25 the two terminals. Normal resistance is machine. approximately 13 ohms. If the resistance is 2.

  • Page 61: Control Board Removal And Replacement

    CONTROL BOARD REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 62 Board PROCEDURE 5. Perform Capacitor Discharge Procedure. 1. Remove input power to the PRO-CUT 25 machine. 6. Using a very small flathead screwdriver or a thin 2. Remove carrying handle using a 4mm allen knife blade, carefully remove the red plastic cap wrench.
  • Page 63 Control board can be removed.) 14. Replace the four allen mounting screws. See Figure F.15. 15. Replace the screws connecting the case front to 10. Remove the Four allen bolts with a 2.5 mm allen wrench. the central metal wall. PRO-CUT 25...
  • Page 64 Replace the red cap on the end of the OUTPUT knob. Replace the case wraparound. Replace the plastic nut from around the pressure regulator. Do Not Over tighten. Replace the carry handle. PRO-CUT 25...

  • Page 65: Input Board Removal And Replacement

    INPUT BOARD REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 66 W ER G AS Input Board M AL PROCEDURE Note the orientation of the input Remove input power to PRO-CUT 25. board to avoid confusion during reassembly. Remove carrying handle using a 4mm allen wrench. Carefully label and remove cooling fan leads from Input Board.
  • Page 67 Do Not Over tighten. Replace the carry handle. Using a 7 mm nut driver replace two leads originating from the Input Switch. (A+B) Reconnect four leads in their correct positions. (AC and CP) PRO-CUT 25...
  • Page 68 F-36 F-36 NOTES PRO-CUT 25...

  • Page 69: Main Inverter Board Removal And Replacement

    MAIN INVERTER BOARD REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 70 MAIN INVERTER BOARD REMOVAL & REPLACEMENT (continued) FIGURE F.18 – MAIN INVERTER BOARD REMOVAL Main Board PROCEDURE Remove input power to PRO-CUT 25. Locate the Main Board, all associated leads and plug connections. Remove carrying handle using a Label the leads and note their positions 4mm allen wrench.
  • Page 71 Replace the plastic nut from around the Reconnect all leads to the new board. pressure regulator. Do Not Over tighten. Replace the four bolts and washers previously removed from the corners of Replace the carry handle. the board. Replace the case wraparound. PRO-CUT 25...
  • Page 72 NOTES F-40 F-40 PRO-CUT 25...

  • Page 73: Switch 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 electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 74 REMOVAL AND REPLACEMENT (continued) FIGURE F.20 – SWITCH Switch PROCEDURE Carefully remove the power switch Remove input power to PRO-CUT 25. assembly from the front of the machine, making note of insulation positioning. Remove carrying handle using a 4mm allen wrench.

  • Page 75: Fan Removal And Replacement

    FAN REMOVAL AND REPLACEMENT WARNING Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.
  • Page 76 F-44 TROUBLESHOOTING & REPAIR F-44 FAN REMOVAL AND REPLACEMENT (continued) PROCEDURE Using a 7mm nut driver, remove Remove input power to PRO-CUT 25. the case wraparound. Remove carrying handle using a Perform Capacitor Discharge 4mm allen wrench. Procedure. Using a crescent wrench, carefully...
  • Page 77 Reconnect labeled leads to the top of the fan. Be sure to replace leads in their proper positions. Replace the case wraparound. Replace the plastic nut from around the pressure regulator. Do Not Over tighten. Replace the carry handle. PRO-CUT 25...

  • Page 78: Retest After Repair

    LED remains lit. Pull the trigger of the torch and verify that a pilot arc does NOT occur. Turn the machine off and then back on to clear the safety error. 7. Turn the PRO-CUT 25 off. PRO-CUT 25...
  • Page 79 F-47 F-47 NOTES PRO-CUT 25...
  • Page 80 PC BOARD ASSEMBLY - INPUT BOARD ........G-7 PRO-CUT 25...
  • Page 81 ELECTRICAL DIAGRAMS ENHANCED WIRING DIAGRAM WIRING DIAGRAM - PRO-CUT 25 WORK CLAMP Q1a,b,c Lout IRG4BC30W 240uH +12VDC TRANSFER 300uH 10/10W C1a,b NZL (2) C2a,b 6.8k/5W Q2a,b,c IRG4BC30W 115VAC SHUNT EL (3) SH- SH+ 230V 15VAC 115V 15VAC SAFETY +28VDC SEC GND...
  • Page 82 ELECTRICAL DIAGRAMS SCHEMATIC- CONTROL PRINTED CIRCUIT BOARD - SHEET 1 NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. PRO-CUT 25...

  • Page 83: Electrical Diagrams

    ELECTRICAL DIAGRAMS SCHEMATIC- CONTROL PRINTED CIRCUIT BOARD - SHEET 2 NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. PRO-CUT 25...
  • Page 84 ELECTRICAL DIAGRAMS SCHEMATIC- CONTROL PRINTED CIRCUIT BOARD - SHEET 3 NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. PRO-CUT 25...
  • Page 85 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 86 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 87 Please include the machine’s code number and how the problem was resolved. Thank You, Technical Services Group Lincoln Electric Co. 22801 ST. Clair Ave. Cleveland, Ohio 44117-1199 FAX 216-481-2309 SVM Number ___________________________...

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