Lincoln Electric SVM154-A service manual Theory of Operation Protection and Shutdown

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THEORY OF OPERATION

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PROTECTION AND SHUTDOWN

 

 

WIRE FEED OVERLOAD

LOSS OF VOLTAGE SENSE

 

PROTECTION

 

SHUTDOWN

 

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The LN-10 has solid-state overload protection of the wire drive motor. If the wire drive motor becomes overloaded for an extended period of time, the protec- tion circuitry turns off the power source, wire feed and gas solenoid, and then displays “H30” on the WFS display (with blank voltage display). This indicates the wire drive motor is overloaded and will remain shut down for about 30 seconds before the unit will auto- matically reset. The “H30” display decrements every seconds until it reaches “HOO”. At that time, the unit resets automatically and the previous displays will return indicating the unit is ready to operate again. Overloads can result from improper tip size, liner, drive rolls, guide tubes, obstructions or bends in the gun cable, feeding wire that is larger than the rated capacity of the feeder or any other factors that would impede normal wire feeding. (See “Avoiding Wire Feeding Problems” in the MAINTENANCE section).

If the actual displayed voltage when the trigger is closed, drops below 8.0 volts for over 0.8 second it is assumed the voltage feed back sensing circuit to the LN-10 is opened or faulty. Loss of Voltage Sense Shutdown occurs until the trigger is released.

This shutdown stops the motor, shuts off the gas flow and disables the power source output to prevent the LN-10 voltage control from driving the power source output too high due to loss of proper feedback sensing via #21 (WORK) and #67 (ELECTRODE) sensing leads.

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GROUNDING LEAD PROTECTOR

The frame of the LN-10 control is grounded to the frame of the power source by a lead in the control cable. An overload protector prevents welding current from damaging this lead if the electrode circuit touch- es the wire feeder frame while the electrode is electri- cally hot.

If such a grounding lead fault occurs, the WFS display will show “GLP”, (with blank voltage display) and the trigger circuit will be disabled. To reset the circuit release the trigger, make sure that the electrode is not touching the wire feeder frame, and then either press any key on the keypad or close the trigger. When the GLP circuit is reset, the “GLP” display is removed and the wire feeder is returned to normal operating mode.

LN-10

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Contents SVM154-A ISAFETYi Safety Fumes and GasesWelding Sparks can cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Installation Table of Contents Installation SectionTechnical Specifications LN-10 Head & Control General DescriptionSafety Precautions Installation of the LN-10 Boom Mount Wire Feeder ComponentsMounting the 10 Series Wire Drive Recommended Processes and EquipmentMounting the LN-10 Control Box Mounting Synergic 7F Wire Drive Unit K679-1 orConnecting Wire Drive Unit to Control Box Wire Drive Speed Range Selection Control Speed Range SettingSeries Wire Drive Ratio Selection Electrode RoutingWire Feed Drive Roll Kits Procedure to Install Drive Roll and Wire GuidesSeries Wire Drive Roll Kit Installation KP1505 and KP1507 Synergic 7F Wire Drive 4-Roll Kits KP655 and KP656GUN and Cable Assemblies with Standard Connection GUN and Cable Assemblies with FAST-MATE ConnectionGmaw Guns Innershield Guns8INSTALLATIONA-8 Series Wire Drive Water Connections for Water Cooled GunsCylinder may explode if damaged Buildup of Shielding GAS may harm health or killElectrical Installation Input Cable LN-10 Control to Power SourceOptional Features Installation Boom and Bench ConversionsMaterials Required for bench to boom conversion Materials Required for boom to bench conversionTable of Contents Operation Section OperationLN-10 Control DIP Switch Setup Setting the DIP SwitchesWire Drive Head Selection Setup DIP Switch AccessWelding Power Source Selection Step Trigger Mode Operation Selection Security Mode SelectionMetric/English Wire Feed Speed Display Selection S2 switch 1 on = m/minMaximum Limits Setting Mode Selection S2 switch 4 on = Robotics mode onS2 switch 6 on Minimum Limits Setting mode on S2 switch 4 OFF = Robotics mode OFF As shippedPower-Down Save Procedure Lights Indicate whichKeypad and Display Operation Keypad and Display DescriptionTrigger Mode Selection Display Control Keys Control Control Select key enables operator to Digital Memory VoltmeterMaximum and Minimum Limits Setting Modes Dual Procedure Remote Wire Reel Loading READI-REELS Spools or CoilsFigure B.2 Making a Weld Procedure for Setting Angle of FeedplateGAS Guard Regulator Setting Wire Reel Changing Wire Feed Overload ProtectionGrounding Lead Protector DH-10Explanation of Prompting Error Messages Display Prompt or ErrorAccessories Table of Contents Accessories SectionTable C.1 LN-10 Wire Feeder Accessories GeneralWire Size Solid Steel Electrode Cored ElectrodeAluminum Electrode Aluminum Electrode For use with Binzel Guns OnlyK683-1 Dual Procedure Switch K683-3 Dual Procedure SwitchK1449-1 Dual Procedure Input Cable AssembliesK1558-1 Remote Switch Interface Module GUN Adapters for 10 SeriesGUN and Cable Assemblies K1561-1 Robotics Interface ModuleK1555-1 Insulated Lift Hook K1557-1 Swivel MountK1556-1 Light Duty Caster KIT Maintenance Table of Contents Maintenance SectionMaintenance Avoiding Wire Feeding Problems Safety PrecautionsRoutine Maintenance Periodic MaintenanceFigure D.1 Major Component Locations Table of Contents Theory of Operation Section Theory of OperationControl Board Input RECEPTACLE, Control Board and Operator Controls Wire Feed Head Receptacle Figure E.3 LN-10 Wire Feed Head and ReceptacleWire Feed Overload Loss of Voltage Sense Protection Shutdown Theory of Operation Protection and ShutdownLN-10 Troubleshooting and Repair Table of Contents Troubleshooting and Repair SectionHOW to USE Troubleshooting Guide Return to Return to Master TOCPC Board Troubleshooting Procedures LN-10 Troubleshooting Guide Function ProblemsFunction Problems Power Source Selection Function Problems Mode Selection Perform the Encoder Board Test Troubleshooting and Repair Mum and minimum limit set Perform the Gas Solenoid Test Feeding Problems Welding Problems LN-10 Test Procedures Wire Drive Motor TestTest Description Materials NeededWire Drive Motor Test Test ProcedureTach Adjustment and Feedback Test Materials Needed20TROUBLESHOOTING and REPAIRF-20 Tach Adjustment and Feedback TestTach Adjustment Procedure LN-10 Keypad Resistance Test 24TROUBLESHOOTING and REPAIRF-24 Keypad Resistance TestControl Ohms 50 Ohms Typical LN-10 Encoder PC Board Test Encoder PC Board Test Figure F.4 Encoder PC Board TestGAS Solenoid Test 30TROUBLESHOOTING and REPAIRF-30 GAS Solenoid TestComponent Replacement Procedures Display PC Board Removal and Replacement32TROUBLESHOOTING and REPAIRF-32 Display PC Board Removal and ReplacementRemoval Procedure Replacement ProcedureGAS Solenoid Removal and Replacement 34TROUBLESHOOTING and REPAIRF-34 GAS Solenoid Removal and ReplacementEncoder PC Board Removal and Replacement Encoder PC Board Removal and Replacement Figure F.8 Encoder PC Board Removal and ReplacementWire Drive Motor and Gear BOX Removal and Replacement Wire Drive Motor and Gear BOX Removal and Replacement Figure F.9 Wire Feed Assembly RemovalTo Remove the Wire Drive Assembly from the Gear BOX To Remove the Drive Motor from the Gear BOXReplacement Procedures Current Sensing Reed Switch Removal and Replacement Current Sensing Reed Switch Plug Check Wire Feed Speed Range Retest After RepairElectrical Diagrams Section Electrical Diagrams Wiring Diagram LN-10 ControlWiring Diagram LN-10 Wire Drive Electrode Cable From Current SensorSchematic Control PC Board #1 Schematic Control PC Board #2 Circuitry TachPC Board ASSEMBLY-CONTROL 3168 GSchematic Display PC Board 5VABoard Schematic Encoder PC Board 22066PC Board ASSEMBLY-ENCODER EncoderSVM Error Reporting Form

SVM154-A specifications

The Lincoln Electric SVM154-A is a powerful and versatile inverter-based welding machine designed for a wide range of applications. As a part of Lincoln Electric's esteemed portfolio, this model is particularly favored for its robust performance and cutting-edge technologies, making it ideal for both professional fabricators and hobbyists alike.

One of the standout features of the SVM154-A is its compact and lightweight design, which enhances portability without compromising power. Weighing significantly less than traditional welding machines, it allows welders to easily transport the equipment to various job sites. This feature is particularly beneficial in industries where mobility is essential.

Equipped with advanced inverter technology, the SVM154-A delivers a stable and smooth arc, providing consistent welding performance even in challenging conditions. The inverter design also contributes to energy efficiency, allowing users to save on operational costs while enjoying superior performance. The machine supports both MIG and TIG welding processes, which adds to its versatility. This adaptability makes it suitable for a range of materials including mild steel, stainless steel, and aluminum.

Another notable characteristic is its user-friendly interface. Designed with the welder in mind, the SVM154-A includes intuitive controls that simplify settings adjustments and operational processes. This ergonomic layout allows for ease of use, even for beginners, while still offering the adjustments that experienced welders appreciate for customizing their welds.

The SVM154-A also includes several safety features, such as thermal overload protection and a dynamic power control, ensuring safe operation while maintaining high productivity. Users benefit from features that protect both the machine and the operator, making it a reliable choice for long hours of work.

Moreover, Lincoln Electric's commitment to durability is evident in the SVM154-A's construction. Built with high-quality materials, this welding machine is designed to withstand the rigors of daily use, ensuring longevity and reliability over time.

In summary, the Lincoln Electric SVM154-A stands out for its portability, versatility, and user-centric design. With advanced inverter technology that promotes energy efficiency and a stability for various welding processes, it serves as a valuable tool for both professionals and hobbyists seeking to achieve high-quality welds across different applications. Its combination of advanced features, safety mechanisms, and rugged durability positions the SVM154-A as a top choice in the welding equipment market.
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