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E-1TABLE OF CONTENTS-THEORY OF OPERATION SECTION E-1

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-1

Engine Starting and Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2

Automatic Engine Idle System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-3

Exciter/Auxiliary Alternator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4

Welding Generator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-6

FIGURE E.1 BLOCK LOGIC DIAGRAM

ELECTRODE

TERMINAL

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THERMOSTART

BUTTON

TO IDLE / ENGINE

PROTECTION BOARD

TO IDLE/ENGINE

PROT. BOARD

THERMOSTAT

INJECTION

PUMP

SOLENOID

SYSTEM

DIESEL

ENGINE

OUTPUT

CONTROL

MIN

MAX

(OFF)

 

AC

 

 

 

 

(-)

(+)

 

 

 

AC

 

 

 

 

 

REMOTE

 

 

 

 

RHEOSTAT

LOCAL

 

 

 

 

 

 

 

POLARITY

RHEOSTAT

 

 

 

(JOB SELECTOR)

 

 

 

SWITCH

 

 

 

RESISTOR

 

(+)

 

 

SHUNT COILS

 

 

 

 

(-)

 

 

 

 

 

 

SERIES COILS

 

EXCITER

 

 

 

 

 

 

 

 

WINDING

(-)

(+)

GENERATOR

 

 

 

EXCITER

 

 

ARMATURE

 

ROTOR

 

 

 

 

 

 

FLASHING

 

TO HOUR METER

RESISTOR AND

DIODE

TOC

S

T

A

R

STARTER T

SOLENOID E

R

RUN/STOP

IDLE SWITCH

SWITCH

 

OIL

PRESSURE TEMP

SWITCH SWITCH

IDLE

SOLENOID

AUXILIARY

POWER

WINDINGS

INTERPOLE COILS

Master

 

HOUR

IDLE / ENGINE

AMMETER

METER

PROTECTION BOARD

RECEPTACLES

RECEPTACLES

 

 

 

 

Return to

 

TO

 

WORK

 

 

TERMINAL

 

FLASHING

ENGINE

TO ALTERNATOR

START

RESISTOR

BUTTON

AND

FAULT

FLASH/SENSE

DIODE

LIGHT

TO INJECTION

PUMP SOLENOID

SAE-400 SEVERE DUTY

Page 31
Image 31
Lincoln Electric SVM187-A service manual 1TABLE of CONTENTS-THEORY of Operation Section E-1

SVM187-A specifications

The Lincoln Electric SVM187-A is a cutting-edge welding machine designed for professional welders and industrial applications. Known for its reliability and performance, it stands out in the competitive welding equipment market. This versatile machine is structured to handle various welding processes, making it a popular choice among users.

One of the primary features of the SVM187-A is its multifunctional capabilities. It supports MIG, TIG, and Stick welding, allowing users to switch between different welding techniques seamlessly. This flexibility makes it suitable for diverse applications, whether working on automotive repairs, metal fabrication, or construction projects. Additionally, the machine is equipped with a robust power output, ranging from low to high amperage settings, enabling users to tackle a wide array of materials, including mild steel, stainless steel, and aluminum.

The SVM187-A incorporates advanced inverter technology, which ensures increased efficiency and reduced energy consumption. This technology leads to a more compact design, making the unit portable and easy to transport. The lightweight construction of the machine does not compromise its durability; it is built with high-quality materials to withstand the rigors of a professional workshop.

Another notable characteristic of the SVM187-A is its user-friendly interface. The intuitive control panel includes digital displays for precise settings adjustments, ensuring accuracy during operation. Beginners and seasoned welders alike can benefit from the clear and straightforward design, reducing training time and enhancing productivity.

Safety features are paramount in the SVM187-A's design. The machine is equipped with thermal overload protection, ensuring that it operates within a safe temperature range to prevent damage and promote longevity. Additionally, it features automatic voltage regulation, which maintains a stable arc even under varying input voltage conditions.

In summary, the Lincoln Electric SVM187-A is a versatile, efficient, and user-friendly welding machine suited for both professional and industrial applications. Its multifunctionality, inverter technology, and robust safety features set it apart from competitors, making it a reliable choice for welders seeking to elevate their craftsmanship while ensuring safety and efficiency. This machine represents the innovation and quality that Lincoln Electric is renowned for in the welding industry.