E-2

E-2

THEORY OF OPERATION

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FIGURE E.2 – BATTERY, STARTER, ENGINE ALTERNATOR, AND PROTECTION CIRCUITS

 

 

 

 

 

 

 

 

 

 

 

 

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PROTECTION

 

 

 

SELECTOR

 

 

 

 

 

RELAY

 

 

 

 

 

 

 

 

 

 

 

 

SWITCH

 

 

 

 

 

 

 

 

 

 

 

 

REED

 

 

 

 

IDLER

 

 

 

 

RELAY

NEGATIVE

 

 

 

 

 

 

 

 

 

 

 

 

BOARD

 

 

 

 

CR2

 

 

 

 

 

 

 

 

 

 

 

OUTPUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TERMINAL

 

 

 

 

 

 

 

 

 

 

115 & 230VAC

 

 

 

 

 

 

 

 

 

 

 

 

RECEPTACLES

 

 

 

 

 

 

IDLER

 

 

 

 

 

 

 

 

 

 

 

 

SOLENOID

 

 

 

 

 

 

 

TOC

 

 

 

OIL

 

 

GENERATOR

 

 

 

 

TOC

 

TEMPERATURE

PRESSURE

 

 

 

FRAME

 

 

 

 

 

GAUGE

SWITCH

 

 

 

 

 

CURRENT

 

 

FUEL

 

 

SERIES

 

 

 

 

 

 

INJECTION

 

 

COILS

 

 

 

 

TRANSFORMER

 

 

PUMP

 

 

 

 

 

 

 

 

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BRUSHES & COMMUTATOR

 

ALTERNATOR

STATOR

 

 

 

ENGINE

MECHANICAL

GENERATOR

ARMATURE

ROTOR

 

 

IGNITION

 

 

COUPLING

ARMATURE

SHAFT

 

 

 

ENGINE

 

 

 

 

 

 

SWITCH

 

 

 

 

SLIP

 

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ALTERNATOR

 

 

 

 

 

 

 

RINGS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INTERPOLE

 

 

 

 

 

 

 

 

 

COILS

RESIDUAL

 

 

 

 

 

 

STARTER

 

 

MAGNETISM

FLASHING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOTOR

 

 

FIELD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SHUNT

 

 

 

 

 

 

 

 

 

 

 

WINDINGS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FIELD

 

 

 

 

 

BATTERY

 

 

 

 

 

RECTIFIER

 

 

 

 

 

 

 

 

 

GENERATOR

 

 

 

 

 

 

 

 

 

 

 

FIELD CONTROL

 

 

POSITIVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT

 

 

 

 

 

 

 

 

 

 

 

 

TERMINAL

TOC

TOC

 

 

 

 

 

 

 

 

 

 

 

Section

Master

GENERAL DESCRIPTION

 

BATTERY, STARTER, ENGINE

 

The SA-250 is a heavy duty, engine driven DC arc

ALTERNATOR, AND PROTECTION

to

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welding power source capable of providing constant

CIRCUITS

 

 

 

current output for stick welding or

DC TIG welding.

The 12VDC battery powers the starter motor and,

Also, a total of 3000 watts of auxiliary power is available

 

 

at the 115 or 230VAC receptacles.

 

 

through the ignition switch, the engine protection cir-

 

 

 

 

 

 

 

cuitry. In the event of a low oil pressure or a high

 

 

 

 

 

 

 

coolant temperature condition, the engine protection

 

 

 

 

 

 

 

system shuts the engine off. The protection relay mon-

 

 

 

 

 

 

 

itors the oil pressure switch and the coolant tempera-

 

 

 

 

 

 

 

ture sensor. If either sensor “faults,” the protection relay

 

 

 

 

 

 

 

deactivates the fuel injection pump, and the engine

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shuts down. The engine alternator supplies “charging”

 

 

 

 

 

current for the battery circuit.

 

 

 

 

 

 

 

 

 

 

 

 

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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.

 

 

 

 

 

SA-250

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Lincoln Electric SVM128-A service manual Theory of Operation, ALTERNATOR, and Protection, Circuits

SVM128-A specifications

The Lincoln Electric SVM128-A is a cutting-edge welding machine designed to meet the demands of both professional welders and DIY enthusiasts. This versatile welding power source brings together advanced technology and robust design, making it a reliable choice for various welding applications.

One of the standout features of the SVM128-A is its capability to perform multiple welding processes. It supports MIG, TIG, and stick welding, allowing users to tackle a wide range of projects with ease. This multi-functionality makes it ideal for professionals working in different industries, as well as for hobbyists who enjoy diverse welding tasks.

The SVM128-A is equipped with inverter technology, which enhances its performance by providing a more stable arc and improved energy efficiency. This technological advancement contributes to lower operational costs and allows for a more consistent weld quality across different materials and thicknesses. Additionally, the inverter technology enables the machine to be lightweight and portable, making it convenient for jobs that require mobility.

Another prominent characteristic of the SVM128-A is its user-friendly interface. The machine features intuitive controls and a digital display that allows operators to easily set the desired welding parameters. This simplified setup helps reduce the learning curve for new users while also offering precise control for experienced professionals.

The Lincoln Electric SVM128-A is designed with durability in mind. Its robust construction ensures that it can withstand the rigors of frequent use in demanding environments. The machine is also equipped with various safety features, including thermal overload protection and a duty cycle rating that prevents overheating, ultimately extending its lifespan.

For optimal performance, the SVM128-A provides adjustable output options, allowing users to customize the welding parameters based on their specific needs. This flexibility makes it suitable for welding various metals, including steel, aluminum, and stainless steel.

In summary, the Lincoln Electric SVM128-A combines versatility, advanced technology, and a user-friendly design. With its capability to perform multiple welding processes, lightweight construction, and durable features, it stands out as an excellent option for anyone looking to achieve high-quality welds. Whether for professional or personal use, the SVM128-A is poised to deliver reliable performance and exceptional results.