Lincoln Electric SVM105-B service manual Switch Boards, Current

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TOC

TOC

E-4

THEORY OF OPERATION

E-4

 

FIGURE E-4 ---SWITCH CIRCUITS & TRANSFORMER

 

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LINE

 

SWITCH

1

 

2

 

3

3A

 

FAN

AUXILIARY

TRANSFORMER

 

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

 

 

 

 

 

 

 

FET MODULES

 

<1 VDC

MAIN TRANSFORMER

TOP

BOTTOM

TOP

CHOKE RECTIFIER HEATSINK

1 DIODE

5 DIODES

5 DIODES

1 DIODE

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TO WIREFEEDER

 

 

 

 

CHOKE

LOCAL

METER

MODE POT

POT

VOLTAGE FEEDBACK

REMOTE

 

 

 

 

 

1ST STEP PWM VOLTAGE

 

CURRENT FEEDBACK-PROTECTION

15VDC-CONTROL BOARD FUNCTION VOLTAGE 24VAC-THERMOSTATS-GUN TRIGGERING

CHOKE

SHUNT

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TOC

SWITCH BOARDS

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The Switch Boards contain the the Field Effect Transistors (FETs) which, when switched ON, supply power to the primary windings of the main transformer. Each Switch Board powers a separate, oppositely wound primary winding. The opposite direction of cur- rent flow in those windings and a slight offset in of the FET switching produces a square wave AC signal in the secondary of the transformer.

The DC current of the primaries is clamped back to the respective capacitors through diodes on the board when the FETs turn off. This protects against inductive voltage spikes due to the inductance of the windings and also helps maintain capacitor balance.

The boards are fired during a 50 microsecond interval with respect to a Pulse Width Modulated (PWM) signal from the Control Board through the Driver Board. This creates a constant 20Khz output in the secondary.

Along with ease of control, the 20Khz operating fre- quency allows for a much smaller and lighter trans- former

Signals from the Current Transformer insure that one switch circuit is turned off before the other is gated on.

Field Effect Transistor operation and Pulse Width Modulation are discussed in more detail later in this section.

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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 Fumes and Gases can be dangerous Electric Shock can killARC Rays can burn Cylinder may explode if damaged SafetyWelding Sparks can cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Section A-1 Table of ContentsInstallation Section Installation Three Phase Single PhaseLocation Product Description Electrical InstallationInput Voltage Setup Single Phase Input Power Input ConnectionConnection of Wire Feeders to the Invertec Three Phase InputParallel Operation Remote Control of InvertecK900-1 DC TIG Starter Connection Output Cables Quick Disconnect Plugs K852-7Operation Section Section B-1Duty Cycle OperationOperating Instructions Control Function / OperationMode Switch Full Range Is Is Very Soft, 10 Is Very CrispMeter Polarity Switch Auxiliary PowerAccessories Section Section C-1Accessories Options / AccessoriesMaintenance Section Section D-1Maintenance Input Filter Capacitor Discharge ProcedurePreventive Maintenance Overload ProtectionFigure D.2 Location of Maintenance Components Theory of Operation Section Section E-1Theory of Operation Input Line Voltage & Auxiliary TransformerPrecharge & Protection Circuits Return to Section To Section TOCSwitch Boards CurrentOutput and Control Circuits FET Modules CurrentPassive Maximum Output Pulse Width ModulationMinimum Output Thermal Protection Protective CircuitsOverload Protection Troubleshooting & Repair Section Section F-1Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Matched Parts Additional Information Oscilloscope WarningInput Filter Capacitor CONDITION- ING Feeding Problems DepartmentFeeding Problems See Input Rectifier test See Output Diodes test See Switch Board test V300-PRO Input Filter Capacitor Discharge Procedure Test DescriptionInput Filter Capacitor Discharge Procedure Figure F.I Location of Input Filter Capacitor TerminalsOutput Pilot Circuit Test Output Pilot Circuit TESTcont G2527 J2 J4 J3V300-PRO Protection Board Output Test Troubleshooting & Repair Test Procedure Protection Figure F.6 Inserting ProbesCapacitor Balance Test Static Capacitor Test 912 V300-PRO Switch Board Test Switch Board Test Switch Board Test Table F.3 Snubber Resistor Test 403 404 Snubber Resistor Test402/ R W Check Test Result Conclusion Next Test Step Repair ActionOutput Diode Test Test Procedure Output Diode TestInput Rectifier Test Probe Acceptable Meter Reading Table F.5Points Steps Overcurrent Protection Current Trigger Test 275D Overcurrent Protection Current Trigger Test302 Control Overvoltage Protection DC Trigger Circuit Test Overvoltage Protection DC Trigger Circuit Test Figure F.16 PC Boards Removed311 309 310 3J8 2J14 1J6 1J8 #311 1J14 6J6 #302#313 #275D #301 #305Thermal Protection AC Trigger Circuit Figure F.20 PC Boards Moved for Access Thermal Protection AC Trigger CircuitFigure F.21 Thermal Protection AC Trigger Circuit V300-PRO Power Board Test Test B Power Board TestTest a Figure F.23 Power Board Test Points Simplified Trigger Circuit Capacitor Removal and Replacement Procedure Capacitor Removal and Replacement ProcedureFigure F.27 -- Removing Capacitor Nuts Figure F.27 Switch Board Removal and Replacement Procedure Switch Board Replacement ProcedureTest After Switch Board or Capacitor Replacement Test After Switch Board or Capacitor Replacement Perform Retest After RepairOutput Diode Replacement Procedure Output Diode Replacement Procedure Procedure Paralleled IndividualDiodes61TROUBLESHOOTING & REPAIRF-61 Procedure Diode ModulesOutput Retest After RepairOCV at rated Input V300-PRO Min. Acceptable Max. All Modes V300-I V300-PROElectrical Diagrams Section Section G-1Wiring Diagram Entire Machine Code 9825 & 9965 L8657 V300 PROWiring Diagram Entire Machine Code 9934 L8841 + ARCWiring Diagram Entire Machine Code 10034 L9299 ARCWiring Diagram Entire Machine Code 10035 L9301 I T C H 13,15 B O a R D F TWiring 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 Schematic Entire Machine Controlboard #.$ #$ !#$ #!%&$Schematic Driver PC Board S20216 PC Board Assembly Driver L8660 IdentificationSchematic Driver PC Board S20799 PC Board Assembly Driver DescriptionSchematic Switch PC Board L8440 PC Board Assembly Switch L8441 CAPACITOR, Cemo 2700P 50V 5%Schematic Switch PC Board L10956 PC Board Assembly Switch L10958-1 Reqd IdentificationSchematic Control PC Board G2525 Electrical Diagrams CAPACITOR, Cemo 150P Schematic Protection PC Board M16097 PC Board Assembly Protection L7915-2 OCI1, OCI2, OCI3, OCI4Schematic Power PC Board M16018 PC Board Assembly Power L8033-7 VOLT. REG. & Heat Sink Asbly

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.

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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.