Lincoln Electric SVM186-A service manual POWER-UP Sequence

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B-5

OPERATION

B-5

 

 

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8.PULSE TIG CONTROL – The Pulse TIG feature built into the PRECISION TIG® 225 is simplified to be a single knob control which sets the Pulse Frequency over the peak pulses/sec. range of about

0.1 to 20 pulses per second:

•Full CCW (min.) setting of the control knob shuts off Pulse TIG (0.0 pps).

•Peak Pulse level is set by the Max. Output Control and the Remote Amptrol (if used).

•Background Current level is typically optimized at a fixed 50% of Peak Pulse level setting.

•Peak Pulse % On-time is typically optimized at a fixed 50%.

A Green light "blinks" with each Peak Pulse to indi- cate the Pulse TIG Control setting before and dur- ing welding.

9.THERMAL SHUTDOWN LIGHT This Yellow LED panel light turns on if the machine output is shut- down because internal overheating has occurred, and turns off when cooled to reset.

10.REMOTE RECEPTACLE – Provides for connec- tion of remote control and/or arc start switch only in TIG Mode: (There is no remote output control capability when stick welding).

•Plugging a remote current control (Amptrol) into this receptacle automatically switches the output control from the panel Max Output Control (See Item 5) to the remote control.

•The connected remote control will then control the output current between the Min. range of the machine and the setting of the panel Max Output Control.

•Switching Mode Switch (See Item 3) to Stick will automatically disable the connected remote con- trol and switch the output control back to the Max Output panel control.

11.ELECTRODE/GAS OUTPUT RECEPTACLE - This quick connect Twist-Mate™ receptacle pro- vides electrical connection to the electrode holder and cable for Stick welding and a combined electri- cal and gas connection for the TIG torch when TIG welding.

12.WORK CABLE - This 10ft.(3.05m) cable with work clamp is factory connected to the welder and its clamp is connected to the work piece to complete the welding circuit. Refer to Machine Grounding and High Frequency Interference Protection in the Installation section of this manual for the prop- er procedure on grounding the work clamp and work piece to minimize high frequency interfer- ence.

POWER-UP SEQUENCE

When the PRECISION TIG® 225 Power switch is ini- tially turned On , the following will be observed: (Refer to this Section Controls and Settings Figure B.1)

•The cooling fan will run for about 5 seconds.

•The previous (prior to Power Off) settings of Mode and Maximum Output will be initiated.

•If in TIG Mode, the shielding gas solenoid valve will be activated for the time set by the Post Flow Time control.

PRECISION TIG® 225

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Contents Precision TIG ISAFETYi Fumes and Gases SafetyFor Electrically Powered equipmentSûreté Pour Soudage a LʼArc Précautions DE SûretéElectromagnetic Compatibility EMC Safety Master Table of Contents for ALL Sections Table of Contents Installation Section Input Single Phase only InstallationK2533-2 Input at Rated Output Model Height Width Depth WeightSelect Suitable Location Mounting Safety PrecautionsLifting and Moving TiltingInput and Grounding Connections Return Section TOC Input Reconnect ProcedureConnections for Stick Smaw Welding Connections for TIG Gtaw WeldingPrecision TIG Table of Contents Operation Section Operation Recommended Processes and EQUIP- Ment Product DescriptionControl Functionality Figure B.1 Control PanelPOWER-UP Sequence Machine Rating Plate Case Rear ComponentsWelding in TIG Mode Operating StepsPulse TIG Control Operation Turn the power switch to on Welding in Stick ModePrecision TIG Table of Contents Accessories Section Accessories Standard Equipment PackagesTable C.1 Table C.2 Factory Installed OptionsK2348-1 Under-Storage Cart Field Installed OptionsTable of Contents Maintenance Section Safety Precautions MaintenanceRoutine and Periodic Maintenance Spark GAP Adjustment1TABLE of CONTENTS-THEORY of Operation Section E-1 Input Power Circuit Theory of OperationGeneral Description Protected Output Rectification Feedback ControlFigure E.2 High Voltage/High Frequency Circuit High Voltage / High Frequency CircuitFigure E.5 DC Welding Current Generation DC Welding OutputFigure E.6 AC Square Wave Welding Current Generation AC Welding OutputFigure E.7 SCR Operation SCR OperationThermal Protection Protective CircuitsOverload Protection VAC Receptacle1TABLE of Contents Troubleshooting and Repair F-1 HOW to USE Troubleshooting Guide Troubleshooting and RepairWorkstations PC Board Troubleshooting ProceduresPerform the T1 Transformer Amptrol is depressed Troubleshooting and Repair Perform the SCR Bridge Test Problems Symptoms Possible Areas MisadjustmentsRecommended Course of Action Troubleshooting and Repair Troubleshooting and Repair Problems Symptoms Electric Shock can Perform the SCR Bridge Test Stick electrode Blasts Off when Weld current may be set too High Frequency Circuit Disable Procedure Test DescriptionMaterials Needed Figure F.1 Spark GAP Assembly ProcedureT1 Transformer Test T1 Transformer Test Primary Windings Primary Voltages Precision TIG Static SCR Test Precision TIG 225 Control Test ProcedureCase Cover Removal and Replacement Procedure Precision TIG Active SCR Test Active SCR Test Figure F.6 SCR Gate Locations Precision TIG Scope Settings Normal Open Circuit Voltage Waveform AC TIG ModeNormal Open Circuit Voltage Waveform DC TIG Mode Normal Open Circuit Voltage Waveform AC Stick Mode Normal Open Circuit Voltage Waveform DC Stick Mode AC TIG Mode Typical Output Voltage Waveform Machine LoadedMachine Loaded to 180 Amps AT 16VDC DC TIG Mode Machine Loaded to 180 Amps AT 26VDC AC Stick ModeDC Stick Mode Troubleshooting and Repair Precision TIG SCR Bridge Assembly Removal and Replacement Procedure Figure F.7 Case Back Mounting Screws SCR Bridge AssemblyProcedure Plug J2 Removed Replacement Procedure Precision TIG Polarity Switch Removal and Replacement Procedure Removal Procedure Polarity SwitchReplacement Procedure Precision TIG High Voltage Transformer Removal and Replacement Procedure Transformer Secondary Leads High Voltage TransformerFigure F.12 High Voltage Transformer Mounting Insulators Precision TIG 53F-53 Perform the SCR Bridge Assembly Replacement Procedure Retest After Repair Input Idle AmpsRecommended Meters for Machine Output Tests Precision TIG Table of Contents Diagram Section Electrical Diagrams Schematic Complete Machine ALL Codes G5647 Schematic Control PC Board #1 G5640 Schematic Control PC Board #2 G5640 Schematic Control PC Board #3 G5640 PC Board Assembly Control #1 G5641 PC Board Assembly Control #2 G5641 1B0-S22530 PC Board Assembly Bypass L10121

SVM186-A specifications

The Lincoln Electric SVM186-A is a versatile and highly efficient welding machine that stands out in the competitive landscape of industrial welding equipment. Designed to meet the needs of both professionals and hobbyists, this machine combines advanced technology with robust construction, delivering outstanding performance in various welding applications.

One of the standout features of the SVM186-A is its multi-process capability. This welding machine can handle MIG, TIG, and Stick welding processes, making it suitable for a diverse range of projects, from light fabrication to heavy-duty work. This flexibility reduces the need for multiple machines, saving time and space for users who require versatility in their welding operations.

The SVM186-A is powered by a reliable and durable inverter technology, which ensures a stable arc and efficient operation across different materials, including stainless steel, aluminum, and mild steel. This inverter technology not only enhances performance but also reduces energy consumption, making it an environmentally friendly choice.

Another notable characteristic of the SVM186-A is its user-friendly interface. The digital display provides real-time information on voltage and wire feed speed, allowing welders to easily adjust settings for optimal results. This intuitive control panel design makes it accessible for both novice welders and seasoned professionals who value precision.

The machine is also built with safety features in mind. It comes equipped with overcurrent protection and thermal overload protection to prevent damage during operation. This ensures that users can work confidently, knowing that the equipment is designed to handle demanding tasks while prioritizing safety.

Portability is another advantage of the SVM186-A. Weighing in at a relatively light weight compared to other industrial welders, this machine is designed for ease of transport. Whether working on-site or in a workshop, welders can easily move the equipment as needed.

In summary, the Lincoln Electric SVM186-A is a sophisticated welding machine that merges technology and practicality. Its multi-process capability, inverter technology, user-friendly interface, safety features, and portability make it a top choice for those seeking dependable and efficient welding solutions. Whether for professional fabrication or personal projects, the SVM186-A is equipped to handle the demands of modern welding tasks with exceptional ease and effectiveness.
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