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E-8

THEORY OF OPERATION

E-8

 

FIGURE E.2 - GENERAL DESCRIPTION

 

ELECTRODE

TERMINAL

OUTPUT

CONTROL

MIN

MAX

(OFF)

 

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THERMOSTART

BUTTON

TO IDLE / ENGINE

PROTECTION BOARD

TO IDLE/ENGINE

PROT. BOARD

S

T

A

R

STARTER T

SOLENOID E

R

RUN/STOP

IDLE SWITCH

SWITCH

 

THERMOSTAT

INJECTION

PUMP

SOLENOID

SYSTEM

DIESEL

ENGINE

OIL

PRESSURE TEMP

SWITCH SWITCH

IDLE

SOLENOID

AC

 

 

 

 

 

(-)

(+)

 

 

 

 

AC

 

 

 

 

 

 

REMOTE

 

 

 

 

 

RHEOSTAT

LOCAL

 

 

 

 

 

 

 

 

 

POLARITY

RHEOSTAT

 

 

 

 

(JOB SELECTOR)

 

 

 

 

SWITCH

 

 

 

 

RESISTOR

 

 

 

FLASHING

TO HOUR METER

 

(+)

 

RESISTOR AND

 

 

 

 

 

SHUNT COILS

 

 

 

DIODE

 

 

(-)

 

 

 

 

 

 

 

 

SERIES COILS

 

EXCITER

 

 

 

 

 

 

 

 

 

 

WINDING

(-)

(+)

 

GENERATOR

 

 

 

 

EXCITER

 

 

 

ARMATURE

 

ROTOR

 

 

 

AUXILIARY

POWER

WINDINGS

INTERPOLE COILS

115 VAC

230 VAC

to

to

 

HOUR

IDLE / ENGINE

AMMETER

METER

PROTECTION BOARD

RECEPTACLES

RECEPTACLES

 

 

 

 

 

TO

 

WORK

 

 

TERMINAL

 

FLASHING

ENGINE

TO ALTERNATOR

START

RESISTOR

AND

FAULT

 

BUTTON

FLASH/SENSE

DIODE

LIGHT

TO INJECTION

PUMP SOLENOID

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WELDING GENERATOR OPERA- TION (Continued)

Current Control:

The Current Control handle turns a rotor inside the reactor assembly. This reactor assembly functions together with the generator’s series coils to regulate the output current and produce the drooping volt/amp curve that is so important to a constant current welding source. This current control has almost no effect on the OCV.

Series coils and reactor:

Current from two of the four sets of brushes is routed through the generator’s series coils and the reactor assembly before being connected to one of the weld output terminals. These series coils are wound and arranged in such a way as to reduce or buck the cur- rent flowing from the armature. Because the series coils do not reduce the weld output until current is flow- ing, OCV is not reduced, and starting the arc is easier.

Reactor Assembly:

The reactor assembly functions like a specialized, high current rheostat, and is connected in parallel with the series coils of the generator. At the very minimum set- ting the reactor is electrically open, forcing all of the current flowing from the armature to pass through the series coils. This setting will produce the lowest weld current that can be set with this control.

Moving the current control off of the minimum setting closes the circuit in the reactor and allows some of the current to bypass the series coils. Continuing to move the control to the higher settings reduces the resis- tance of the reactor and causes even more current to bypass the series coils. When the current control is set to maximum, the reactor resistance is at minimum, and nearly all of the current passes through the reactor. Because the current passing through the reactor is not reduced by the bucking action of the series coils, weld current is increased.

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

SAE-400 SEVERE DUTY

Page 37 Page 39
Page 38
Image 38
Lincoln Electric SVM187-A service manual Series coils and reactor, Reactor Assembly
Page 37 Page 39

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.
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