Lincoln Electric SVM105-B Precharge & Protection Circuits, Return to Section To Section TOC

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Section TOC

Master TOC

E-3

THEORY OF OPERATION

E-3

 

FIGURE E-3 ---PRECHARGE & PROTECTION CIRCUITS

 

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1

2

3

FAN

LINE

SWITCH

3A

AUXILIARY

TRANSFORMER

TO

WIREFEEDER

POWER SWITCH SECTIONS 20KHZ

LEFT SWITCH BOARD

FET MODULES

 

 

 

CAP

 

 

 

 

FET MODULES

CURRENT

1ø OR 3ø DETETCTION (H5)

 

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

PRE-CHARGE

 

 

 

 

INPUT

DRIVER

 

 

 

 

RECTIFIER

BOARD

 

 

 

CONTROL

 

CR1

 

 

 

 

 

 

 

BOARD

AC1

 

PROTECTION

PULSE

 

AC2

BOARD

 

Y-Y FEEDBACK

TRAIN

 

AC3

 

 

 

 

CR2

 

 

 

 

 

 

 

 

 

A-LEAD

 

 

 

 

 

24VDC

PRE-CHARGE

 

 

 

 

 

 

 

 

 

 

 

RIGHT SWITCH BOARD

18VAC

2ND STEP PWM

 

FET MODULES

 

 

 

 

 

 

 

 

 

 

POWERBOARD

 

CAP

 

24VAC

 

 

 

 

 

 

 

 

 

 

<1 VDC

 

FET MODULES

 

 

 

 

 

 

 

LOCAL

METER

MODE

POT

POT

 

REMOTE

 

 

 

 

 

 

1ST STEP PWM VOLTAGE

 

 

 

15VDC-CONTROL BOARD FUNCTION VOLTAGE

 

 

24VAC-THERMOSTATS-GUN TRIGGERING

 

 

MAIN

CHOKE

RECTIFIER

TRANSFORMER

HEATSINK

 

 

TOP

 

 

 

 

1 DIODE

5 DIODES

BOTTOM

5 DIODES

TOP

1 DIODE

CHOKE

VOLTAGE FEEDBACK

CURRENT FEEDBACK-PROTECTION

CHOKE

SHUNT

TOC

TOC

PRECHARGE & PROTECTION CIRCUITS

The DC voltage from the Input Rectifier is applied to the Driver Board to begin charging the Switch Board capacitors at a slow rate. When the pre-charge level is achieved, the input relays close, applying the full DC voltage to the capacitors. Depending on the Code Number of the machine, there will be either two or four relays and they may or may not be mounted on the Driver Board.

The Driver Board is also responsible for gating the Field Effect Transistors (FETs) on the Switch Boards, as directed by the pulse width modulated (PWM) signal from the Control Board.

The Protection Board monitors the capacitors for prop- er balance and voltage level. If an imbalance or over- voltage condition is detected, the Protection Circuit will de-energize the relays, removing the power from the switch circuits. The machine output will also be dis- abled.

Another function of the Protection Board is to detect whether the input voltage is single phase or three phase and pass that information to the Control Board. The maximum output of the machine will be limited to approximately 250 amps with single phase input and 360 amps with 3 phase input.

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NOTE: Unshaded areas of block logic diagram are the subject of discussion

V300-PRO

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Contents Invertec V300-PRO Safety ARC Rays can burn Electric Shock can killFumes and Gases can be dangerous Welding Sparks can cause fire or explosion SafetyCylinder may explode if damaged IiiSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Installation Section Table of ContentsSection A-1 Three Phase Single Phase InstallationInput Voltage Setup Product Description Electrical InstallationLocation Connection of Wire Feeders to the Invertec Power Input ConnectionSingle Phase Input Three Phase InputK900-1 DC TIG Starter Connection Remote Control of InvertecParallel Operation Quick Disconnect Plugs K852-7 Output CablesSection B-1 Operation SectionOperating Instructions OperationDuty Cycle Control Function / OperationFull Range Is Is Very Soft, 10 Is Very Crisp Mode SwitchAuxiliary Power Meter Polarity SwitchSection C-1 Accessories SectionOptions / Accessories AccessoriesSection D-1 Maintenance SectionInput Filter Capacitor Discharge Procedure MaintenanceOverload Protection Preventive MaintenanceFigure D.2 Location of Maintenance Components Section E-1 Theory of Operation SectionInput Line Voltage & Auxiliary Transformer Theory of OperationReturn to Section To Section TOC Precharge & Protection CircuitsCurrent Switch BoardsFET Modules Current Output and Control CircuitsPassive Minimum Output Pulse Width ModulationMaximum Output Overload Protection Protective CircuitsThermal Protection Section F-1 Troubleshooting & Repair SectionHOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board Troubleshooting Procedures Input Filter Capacitor CONDITION- ING Additional Information Oscilloscope WarningMatched Parts Department Feeding ProblemsFeeding Problems See Input Rectifier test See Output Diodes test See Switch Board test V300-PRO Test Description Input Filter Capacitor Discharge ProcedureFigure F.I Location of Input Filter Capacitor Terminals Input Filter Capacitor Discharge ProcedureOutput Pilot Circuit Test Output Pilot Circuit TESTcont J2 J4 J3 G2527V300-PRO Protection Board Output Test Troubleshooting & Repair Test Procedure Figure F.6 Inserting Probes ProtectionCapacitor Balance Test Static Capacitor Test 912 V300-PRO Switch Board Test Switch Board Test Switch Board Test Table F.3 Snubber Resistor Test 402/ R W Snubber Resistor Test403 404 Check Test Result Conclusion Next Test Step Repair ActionOutput Diode Test Output Diode Test Test ProcedureInput Rectifier Test Points Steps Table F.5Probe Acceptable Meter Reading Overcurrent Protection Current Trigger Test 302 Overcurrent Protection Current Trigger Test275D Control Overvoltage Protection DC Trigger Circuit Test Figure F.16 PC Boards Removed Overvoltage Protection DC Trigger Circuit Test311 309 310 #313 #275D 1J8 #311 1J14 6J6 #3023J8 2J14 1J6 #301 #305Thermal Protection AC Trigger Circuit Thermal Protection AC Trigger Circuit Figure F.20 PC Boards Moved for AccessFigure F.21 Thermal Protection AC Trigger Circuit V300-PRO Power Board Test Test a Power Board TestTest B Figure F.23 Power Board Test Points Simplified Trigger Circuit Capacitor Removal and Replacement Procedure Procedure Capacitor Removal and ReplacementFigure F.27 -- Removing Capacitor Nuts Figure F.27 Switch Board Removal and Replacement Procedure Procedure Switch Board ReplacementTest After Switch Board or Capacitor Replacement Perform Retest After Repair Test After Switch Board or Capacitor ReplacementOutput Diode Replacement Procedure Procedure Paralleled IndividualDiodes Output Diode Replacement ProcedureProcedure Diode Modules 61TROUBLESHOOTING & REPAIRF-61OCV at rated Input V300-PRO Retest After RepairOutput Min. Acceptable Max. All Modes V300-I V300-PROSection G-1 Electrical Diagrams SectionV300 PRO Wiring Diagram Entire Machine Code 9825 & 9965 L8657+ ARC Wiring Diagram Entire Machine Code 9934 L8841ARC Wiring Diagram Entire Machine Code 10034 L9299I T C H 13,15 B O a R D F T Wiring Diagram Entire Machine Code 10035 L9301Wiring Diagram Entire Machine Code 10130 L9567 Wiring Diagram Entire Machine Code 10131 L9569 Wiring Diagram Entire Machine Code 10256 L10189 Wiring Diagram Entire Machine Code 10257 L10191 Controlboard #.$ #$ !#$ #!%&$ Schematic Entire MachineSchematic Driver PC Board S20216 Identification PC Board Assembly Driver L8660Schematic Driver PC Board S20799 Description PC Board Assembly DriverSchematic Switch PC Board L8440 CAPACITOR, Cemo 2700P 50V 5% PC Board Assembly Switch L8441Schematic Switch PC Board L10956 Reqd Identification PC Board Assembly Switch L10958-1Schematic Control PC Board G2525 Electrical Diagrams CAPACITOR, Cemo 150P Schematic Protection PC Board M16097 OCI1, OCI2, OCI3, OCI4 PC Board Assembly Protection L7915-2Schematic Power PC Board M16018 VOLT. REG. & Heat Sink Asbly PC Board Assembly Power L8033-7

SVM105-B specifications

The Lincoln Electric SVM105-B is a state-of-the-art welding machine that represents a leap forward in welding technology, designed for both professionals and enthusiasts in the welding industry. This versatile machine combines robust performance with user-friendly features, making it suitable for a wide range of welding applications.

One of the key features of the SVM105-B is its advanced inverter technology. This allows for a lightweight design without compromising on power output. The inverter technology ensures a stable arc and precise control, enabling consistent weld quality across various materials, including mild steel, stainless steel, and aluminum. This feature is particularly beneficial for users who demand exceptional performance in both thin and thick materials.

The SVM105-B also boasts an impressive output range, typically between 10A to 105A, allowing for adaptability to different welding tasks. Its ability to seamlessly switch between DC and AC modes makes it an ideal choice for professionals working in diverse environments, facilitating operations such as TIG and stick welding. This versatility is further enhanced by its compatibility with various electrode types, ensuring a more efficient and effective welding process.

User safety and comfort have not been overlooked in the design of the SVM105-B. Equipped with an efficient cooling system, this machine effectively manages heat during prolonged use, ensuring durability and longevity. Additionally, its intuitive digital display provides real-time feedback on settings, making it easier for users to monitor parameters and make necessary adjustments on the fly.

The SVM105-B is built with portability in mind. Its compact and lightweight design makes it easy to transport, enabling welders to bring their equipment to job sites without hassle. Furthermore, the machine features sturdy handles that contribute to its ease of maneuverability, supporting the demands of both inside workshops and outdoor projects.

Moreover, Lincoln Electric places a strong emphasis on quality and reliability, and the SVM105-B is a testament to this commitment. The machine is constructed from durable materials designed to withstand the rigors of daily use, ensuring it remains a staple in any welder's toolkit for years to come.

In conclusion, the Lincoln Electric SVM105-B stands out with its combination of advanced inverter technology, versatile output, user-friendly interface, and robust construction. Whether for professional or hobbyist use, this welding machine meets a wide array of welding needs while providing excellent performance and durability.