E-2

E-2

THEORY OF OPERATION

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

 

 

ON LATER MODELS

 

 

 

 

 

 

 

 

to

to

 

PROTECTION AND IDLER CIRCUITS

 

 

 

 

 

 

 

 

 

ARE ON ONE PC BOARD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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PROTECTION

 

 

 

SELECTOR

 

 

 

 

 

RELAY

 

 

 

 

 

 

 

 

 

 

 

 

SWITCH

 

 

 

 

 

 

 

 

 

 

 

 

REED

 

 

 

 

 

IDLER

 

 

 

 

RELAY

NEGATIVE

 

 

BOARD

 

 

 

 

CR2

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT

 

 

 

 

 

 

 

 

 

 

 

 

TERMINAL

 

 

 

 

 

 

 

 

 

 

115 & 230VAC

 

 

 

 

 

 

 

 

 

 

 

 

RECEPTACLES

 

 

 

 

 

 

IDLER

 

 

 

 

 

 

 

 

 

 

 

 

SOLENOID

 

 

 

 

 

 

 

 

 

 

OIL

OIL

 

 

GENERATOR

 

 

 

 

 

 

 

TEMPERATURE

PRESSURE

 

 

FRAME

 

 

 

 

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SENSOR

SENSOR

 

 

 

 

 

CURRENT

 

 

FUEL

 

 

SERIES

 

 

 

 

 

 

SOLENOID

 

 

COILS

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

 

 

 

 

to Section

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RELAY

 

 

 

 

 

 

ALTERNATOR

STATOR

 

 

CR1

 

 

 

 

BRUSHES & COMMUTATOR

 

 

 

 

 

 

 

 

 

 

 

 

(NOT PRESENT

ENGINE

 

GENERATOR

 

 

 

 

 

ON LATER MODELS)

MECHANICAL

ARMATURE

ROTOR

 

 

 

 

 

 

IGNITION

 

 

COUPLING

ARMATURE

SHAFT

 

 

 

ENGINE

 

 

 

 

 

 

SWITCH

 

 

 

 

SLIP

 

ALTERNATOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RINGS

 

 

 

 

 

 

 

 

 

 

 

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Return

 

 

 

 

INTERPOLE

 

 

 

 

 

 

 

 

 

COILS

RESIDUAL

 

 

 

 

 

 

STARTER

 

 

MAGNETISM

FLASHING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOTOR

 

 

FIELD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SHUNT

 

 

 

 

 

 

 

 

 

 

 

WINDINGS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FIELD

 

 

 

 

 

BATTERY

 

 

 

 

 

RECTIFIER

 

 

 

 

 

 

 

 

 

GENERATOR

 

 

 

 

 

 

 

 

 

 

 

FIELD CONTROL

 

 

POSITIVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT

 

 

 

 

 

 

 

 

 

 

 

 

TERMINAL

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GENERAL DESCRIPTION

 

BATTERY, STARTER, ENGINE,

 

 

 

 

 

 

ALTERNATOR, AND PROTECTION

Section

Master

The Classic II is a heavy duty, engine driven DC arc

welding power source capable of providing constant

CIRCUITS

 

 

 

current output for stick welding or

DC TIG welding.

 

 

 

 

 

 

to

to

The 12VDC battery powers the starter motor and,

Also, a total of 3000 watts of auxiliary power is avail-

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able at the 115 or 230VAC receptacles. The Classic II

through the ignition switch, the engine protection cir-

is manufactured with all copper windings.

 

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

 

 

 

 

 

temperature condition, the engine protection system

 

 

 

 

 

 

 

shuts the engine off. The protection relay monitors the

 

 

 

 

 

 

 

oil pressure sensor and the oil temperature sensor. If

 

 

 

 

 

 

 

either sensor “ faults,” the protection relay deactivates

 

 

 

 

 

 

 

the fuel solenoid and the engine shuts down.

 

 

 

The engine alternator supplies “charging” current for

 

 

the battery circuit. If the alternator would cease to func-

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tion correctly, due to a broken fan belt or other mal-

function, the CR1 relay would activate, causing the pro-

tection relay to close the fuel solenoid and shut off the

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engine.

 

 

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

 

 

 

 

CLASSIC II

Page 46
Image 46
Lincoln Electric SVM125-A service manual Theory of Operation, ALTERNATOR, and Protection, Circuits

SVM125-A specifications

The Lincoln Electric SVM125-A is a versatile and highly efficient welding machine that has gained significant recognition in the welding industry. Designed for both professionals and enthusiasts, this machine combines advanced technology with user-friendly features to deliver outstanding performance in a range of welding applications.

One of the standout features of the SVM125-A is its Inverter Technology. This cutting-edge technology allows for lightweight and compact design, making the machine highly portable. The inverter technology also provides a steady arc, which is crucial for achieving clean, high-quality welds. With a duty cycle of 125 amps at a 60% duty cycle, this welding machine can handle a variety of materials and thicknesses, from thin sheet metal to heavier structural components.

The SVM125-A supports multiple welding processes, including MIG, stick, and TIG welding. This versatility makes it an ideal choice for diverse welding tasks, whether you're working in a fabrication shop, doing repair work, or engaged in hobbyist projects. The machine features easy switch functionality, allowing users to quickly shift between welding processes without complicated setup.

Another notable characteristic is the machine's user-friendly interface. The intuitive control panel includes clear indicators and knobs that allow for easy adjustments of voltage and wire feed speed. This design is especially helpful for novice welders, providing them with the confidence to make adjustments as needed and ensuring optimal weld quality.

Safety is also a priority with the SVM125-A. The machine is equipped with thermal overload protection, which automatically shuts it down in case of overheating, preventing damage to the unit and ensuring operator safety. Additionally, the machine features a robust construction that emphasizes durability, making it suitable for demanding work environments.

Portability is enhanced through its lightweight design, and the built-in carrying handle makes it easy to transport from one job site to another. The SVM125-A is also compatible with a variety of welding accessories, further increasing its adaptability and functionality.

In conclusion, the Lincoln Electric SVM125-A stands out as a well-rounded welding machine that integrates advanced technology with user-friendly features. Its versatility in welding processes, robust design, and emphasis on safety and usability make it a valuable tool for welders at all skill levels. Whether for professional use or personal projects, the SVM125-A is a reliable choice that delivers exceptional performance and quality.