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E-2E-2

THEORY OF OPERATION

FIGURE E.2 - General Description & Input Power Circuit

BY-PASS

BOARD

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INPUT

POWER

SWITCH BYPASS

ASBLY

H1

H2

H3

115 VAC

FAN

Receptacle

 

Circuit Breaker

Protected

 

MAIN

TRANSFORMER

X1

X2

18VAC

18VAC

115VAC

POLARITY

SWITCH

AC DC+

SCR

BRIDGE

SHUNT AC DC-

F

E

E

D

B

A

C

K

CONTROL

BOARD

WORK

ELECTRODE

HI-FREQUENCY

TRANSFORMER

C

H

O

K

E

HIGH VOLTAGE

TRANSFORMER

CIRCUIT

115VAC

POWER "ON"

DIGITAL DISPLAY

MODE

SWITCH

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REMOTE

 

 

THERMO-

RECEPTACLE

THERMAL

GAS

 

STATS

 

LIGHT

VALVE

 

 

OUTPUT CONTROL

AUTO

PULSE TIG

STICK

AC

PULSE POSTFLOW

BALANCE FREQ. LED

LED

BALANCE

CONTROL CONTROL

LED

LED

 

CONTROL

 

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GENERAL DESCRIPTION

The PRECISION TIG® 225 is a member of our field acclaimed PRECISION TIG® family of industrial arc welding power sources. Premium features include:

1.Precise constant current output.

2.Full range square wave AC/DC TIG (GTAW) welding.

3.Enhanced version of the patented MicroStartTM Technology for its lower Minimum (5amps) to high- er Maximum (225 amps) output control range.

4.Built-in high frequency stabilization for DC TIG starting and continuous AC TIG welding.

5.AC/DC Stick (SMAW capability.)

INPUT POWER CIRCUIT

The desired single-phase input power is connected to the TIG 225 through an input power switch located in the front panel of the machine. The machine can be configured for either 230VAC or 208VAC input voltage by connecting the appropriate lead (H2 or H3) to the input power switch. When the input power switch is turned “ON” the input voltage is applied directly to the primary of the main transformer.

The main transformer changes the high voltage, low current input power to a low voltage, high current out- put which is available at the main secondary winding (X1 and X2). In addition three auxiliary windings are incorporated in the main transformer. The 115VAC winding supplies power to the fan motor, the 115 VAC receptacle, and also, through the control board, pow- ers the gas solenoid valve and the high voltage trans- former. The 18VAC winding provides power to the trig- ger circuitry. The other 18VAC winding is rectified and regulated to a 15VDC supply which operates the cir- cuitry on the control board.

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

PRECISION TIG® 225

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Lincoln Electric SVM186-A service manual Theory of Operation, General Description, Input Power Circuit

SVM186-A specifications

The Lincoln Electric SVM186-A is a versatile and highly efficient welding machine that stands out in the competitive landscape of industrial welding equipment. Designed to meet the needs of both professionals and hobbyists, this machine combines advanced technology with robust construction, delivering outstanding performance in various welding applications.

One of the standout features of the SVM186-A is its multi-process capability. This welding machine can handle MIG, TIG, and Stick welding processes, making it suitable for a diverse range of projects, from light fabrication to heavy-duty work. This flexibility reduces the need for multiple machines, saving time and space for users who require versatility in their welding operations.

The SVM186-A is powered by a reliable and durable inverter technology, which ensures a stable arc and efficient operation across different materials, including stainless steel, aluminum, and mild steel. This inverter technology not only enhances performance but also reduces energy consumption, making it an environmentally friendly choice.

Another notable characteristic of the SVM186-A is its user-friendly interface. The digital display provides real-time information on voltage and wire feed speed, allowing welders to easily adjust settings for optimal results. This intuitive control panel design makes it accessible for both novice welders and seasoned professionals who value precision.

The machine is also built with safety features in mind. It comes equipped with overcurrent protection and thermal overload protection to prevent damage during operation. This ensures that users can work confidently, knowing that the equipment is designed to handle demanding tasks while prioritizing safety.

Portability is another advantage of the SVM186-A. Weighing in at a relatively light weight compared to other industrial welders, this machine is designed for ease of transport. Whether working on-site or in a workshop, welders can easily move the equipment as needed.

In summary, the Lincoln Electric SVM186-A is a sophisticated welding machine that merges technology and practicality. Its multi-process capability, inverter technology, user-friendly interface, safety features, and portability make it a top choice for those seeking dependable and efficient welding solutions. Whether for professional fabrication or personal projects, the SVM186-A is equipped to handle the demands of modern welding tasks with exceptional ease and effectiveness.