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Lincoln Electric SVM187-A service manual Welding Generator OPERA- Tion, Producing weld current

Models: SVM187-A

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E-7

THEORY OF OPERATION

E-7

 

FIGURE E.2 - GENERAL DESCRIPTION

 

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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

ELECTRODE

TERMINAL

OUTPUT

CONTROL

MIN

MAX

(OFF)

 

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

 

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)

Producing weld current:

Weld current is produced in the armature windings when it spins in the magnetic field produced by the excitation process described above. The 64 Ohm rheo- stat in the excitation circuit varies the strength of the field. A stronger field will produce greater weld output; a weaker field will produce less.

As the windings in the armature pass through the mag- netic field, current flows, first in one direction, then the other. This alternating current flow is converted to direct current (DC) and connected to the remaining generator circuitry through a commutator and a system of brushes.

The commutator is a cylindrical structure made up of copper conductor bars and insulating materials that keep each bar isolated from the other bars and from the armature shaft. Each bar is connected to the end of an armature winding.

The brushes contact the commutator at precise points around its circumference and are positioned so that they will conduct current only from windings that are producing maximum output at the correct polarity.

With the armature spinning at about 1800 RPM, wind- ings are coming in contact with the brushes many times per second, producing a continuous flow of DC current at the generator brushes.

Controlling the weld output:

The SAE-400 utilizes a dual continuous control system for weld output. These controls are the Job Selector and the Current Control dials on the control panel of the SAE-400 machine.

Job Selector:

The Job Selector handle rotates the 64 Ohm rheostat described in the section on excitation and field control. This control has a significant effect on the open circuit voltage (OCV) of the weld output.

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

SAE-400 SEVERE DUTY

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Lincoln Electric SVM187-A service manual Welding Generator OPERA- Tion, Producing weld current
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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.