Lincoln Electric SVM146-A Protection Circuits, Overload Protection, Thermal Protection

Page 37

E-7

E-7

THEORY OF OPERATION

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

PROTECTION CIRCUITS

Protection circuits are designed into the PRO-CUT 80 machine to sense trouble and shut down the machine before the trouble damages internal machine compo- nents. Both overload and thermal protection circuits are included.

OVERLOAD PROTECTION

The PRO-CUT 80 is electrically protected from pro- ducing higher than normal output currents. If the out- put current exceeds 85-90 amps, an electronic pro- tection circuit limits the current to within the capabili- ties of the machine.

Another protection circuit monitors the voltage across the input filter capacitors. If the filter capacitor voltage is too high, too low or not balanced the protection cir- cuit may prevent machine output.

THERMAL PROTECTION

Two thermostats protect the machine from excessive operating temperatures. One thermostat is located on the output choke and the other on the power board IGBT heat sink. Excessive temperatures may be caused by a lack of cooling air or by operating the machine beyond the duty cycle and output rating. If excessive operating temperatures should occur, the thermal status indicator will light and the thermostat will prevent output voltage or current.

Thermostats are self-resetting once the machine cools sufficiently. If the thermostat shutdown was caused by excessive output or duty cycle and the fan is oper- ating normally, the power switch may be left on and the reset should occur within a 15 minute period. If the fan is not turning or the air intake louvers are obstructed, the input power must be removed and the fan problem or air obstruction must be corrected.

Return to Section TOC

Return to Master TOC

PRO-CUT 80

Page 36 Page 38
Image 37
Page 36 Page 38
Contents PRO-CUT California Proposition 65 Warnings SafetyElectric Shock can kill Cylinder may explode if damaged Précautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications PRO-CUT InstallationGAS Requirements Technical Specifications Cont’d PRO-CUTSelect Suitable Location Safety PrecautionsLifting and Moving StackingInput Wire and Fuse Size Input Power Cord Connector InstallationInput Connections Ground ConnectionReconnect Procedure Reconnect ProcedureReturn Return to Section TOC GAS Input ConnectionsTorch Connection Output ConnectionsTable of Contents Operation Section OPERATIONB-2 Safety InstructionsOperating Instructions Design Features Advantages Operational Features and ControlsOperation General DescriptionConsumable Life Cutting CapabilityLimitations Cutting Operation Controls and SettingsPilot ARC Considerations Safety Status Indicator Procedure Recommendations Preheat Temperature forPlasma Cutting User ResponsibilitySuggestions for Extra Utility from the PRO-CUT System Thick Sections of MetalARC Initiated ARC StartARC Voltage PRO-CUT Accessories Table of ContentsGeneral Options Accessories Table of Contents Maintenance Electric Shock can kill Input Filter Capacitor Discharge ProcedurePeriodic Maintenance Routine MaintenanceMaintenance Table of Contents Theory of Operation Section Theory of Operation Input Line VOLTAGE, Switch and Main TransformerPrecharge and Protection Power BoardFigure E.4 Main Transformer Main TransformerFigure E.5 Plasma Output Board and Torch Output Board and TorchFigure E.6 Control and Display Boards Control and Display BoardsOverload Protection Protection CircuitsThermal Protection Insulated Gate Bipolar Transistor Igbt Operation Minimum Output Pulse Width ModulationMaximum Output PRO-CUT Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board can be damaged by static electricity PC Board Troubleshooting ProceduresOutput Problems Troubleshooting GuideFunction Problems Air begins to flow when Make sure the air pressure is Cutting Problems LED Function Problems Troubleshooting Guide Materials Needed DescriptionFigure F.1 Location of Input Filter Capacitor Terminals Input Filter Capacitor Discharge ProcedureInput Rectifier Test Input Rectifier Test Test ProcedureTest Point Terminals Analog Meter X10 Range Primary Power Board Resistance Test Capacitor Voltage Test Capacitor Voltage Test Primary Power Board Resistance TestBoard Removal and Replacement Procedure Test Procedure Table F.3 Capacitor Voltages Output Power Board Resistance Test Figure F.4 Output Power Board Lead Locations Output Power Board Resistance TestOutput Power Board Removal and Replacement Procedure Torch Continuity and Solenoid Test Torch Continuity and Solenoid Test Test ProcedureAIR/GAS Solenoid Test Figure F.6 AIR Solenoid AIR/GAS Solenoid TestT2 Auxiliary Transformer Test T2 Auxiliary Transformer Test ProcedureYellow 1J21 Yellow 7J21 115VAC Test Point Expected VoltageTrigger Circuit Test Simplified Trigger Circuit Trigger Circuit TestPerform the Input Filter Capacitor Discharge Procedure PRO-CUT 80 Output Board LED Definitions Figure F.11 Control Board LEDs Control Board LED DefinitionsLOW Voltage Circuit Test T2 Auxiliary Transformer LOW Voltage Circuit TestFigure F.12, Low Voltage Circuit Diagram Test Point Figure F.15 Display Board Test Points Control Board Removal and Replacement Screws Control Board Removal and ReplacementFigure F.18 Control Board Removal from Mounting Pins Display Board Removal and Replacement Figure F.19 Case Front Screw Removal Display Board Removal & ReplacementFigure F.20 Display Board Removal Output Power Board Removal and Replacement Output Power Board Output Power Board Removal & ReplacementFigure F.22 Output Board Lead Locations Replacement Procedure This procedure takes approximately 40 minutes to perform Removal and Replacement Primary Power Board and Filter CapacitorRemoval Procedure Heatsink Mounting Screws Socket Head Capacitor Removal Capacitor Replacement and P.C. Board ReplacementInput Rectifier Bridge Removal and Replacement Figure F.25 Input Rectifier Lead Locations PRO-CUT Input Rectifier Bridge Removal and ReplacementTroubleshooting & Repair Input Idle Amps and Watts Retest After RepairPRO-CUT Electrical Diagrams Wiring Diagram PRO CUT 2ELECTRICAL Diagrams G-2Cutting Current Setpoint Local Schematic Control PC BoardPRO-CUT 80 Control PC Board Assembly Control Board Code 10574 onlyG3560-1 PC Board Assembly Control Board Code 10577 & 10578 onlySchematic Power PC Board 6ELECTRICAL DIAGRAMSG-6Power PC Board Assembly Power BoardElectrical Reqd Identification PC Board Assembly Output BoardFilename Schematic Display PC BoardLight BAR,LED,GREEN PC Board Assembly Display BoardSVM Error Reporting Form

SVM146-A specifications

Lincoln Electric's SVM146-A is a versatile and powerful multi-process welding machine designed for professionals in various industries. Known for its robustness and reliability, this machine excels in both performance and user-friendly features, making it a popular choice among welders.

One of the standout features of the SVM146-A is its multi-process capability, allowing users to perform MIG, TIG, and stick welding using a single unit. This versatility is enhanced by Lincoln Electric's innovative Auto-Set technology, which automatically adjusts the machine's settings based on the selected process and materials being welded. This feature significantly reduces the time spent on setup and helps ensure optimal weld quality, even for less experienced operators.

The SVM146-A is powered by a reliable inverter design, which provides greater efficiency compared to traditional transformer-based machines. This compact and lightweight design allows for easy transport, making it ideal for job sites or remote locations. The inverter technology also contributes to enhanced arc stability and better overall performance, providing high-quality welds in less time.

Another key characteristic of this welding machine is its robust construction, designed to withstand the rigors of heavy industrial use. The SVM146-A features a durable chassis and control panel, ensuring longevity and reliability under challenging working conditions. Additionally, its intuitive interface allows users to easily navigate settings and make adjustments as needed.

Safety is a paramount concern in welding applications, and the SVM146-A is equipped with several safety features, including over-temperature and over-voltage protection, ensuring that the machine operates safely even in demanding environments. It also features a start inhibit system, preventing the machine from being started under unsafe conditions.

The SVM146-A is compatible with a variety of welding accessories and consumables, enhancing its flexibility and usability across different applications. Whether it’s automotive repair, heavy fabrication, or maintenance work, this welding machine adapts to various tasks, making it a valuable addition to any professional's toolkit.

In conclusion, Lincoln Electric's SVM146-A stands out as a multi-process welding machine that combines advanced technology, robust design, and user-friendly features. It is engineered for performance and reliability, making it an excellent investment for professionals dedicated to achieving high-quality welds.
Top Page Image Contents