E-3

THEORY OF OPERATION

E-3

 

 

 

 

TOC

TOC

 

 

FIGURE E.3 — SWITCH BOARDS AND MAIN TRANSFORMER

 

 

 

 

 

 

 

 

 

MAIN

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

CURRENT

Section

Master

 

 

 

 

 

 

 

 

 

 

SENSOR

 

 

 

 

 

 

LEFT

 

 

 

 

 

 

 

 

 

 

SWITCH

 

 

 

 

 

 

 

 

 

BOARD

 

 

OUTPUT

 

 

 

 

 

 

 

 

 

 

TERMINAL

to

to

 

 

 

 

 

 

PWM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INPUT

 

INPUT

 

 

DRIVE

 

 

 

 

Return

Return

 

 

 

 

 

 

 

 

 

CONTACTOR

RECTIFIER

R

S

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E

W

 

PRIMARY

 

 

 

 

 

 

C

 

 

 

 

 

 

 

O

I

 

CURRENT

 

 

 

 

 

 

N

T

 

SENSOR

 

 

 

 

 

 

 

 

N

CAPACITOR

 

 

 

 

 

 

 

 

 

E

C

VOLTAGE

 

 

 

 

 

 

 

 

 

 

C

H

FEEDBACK

 

 

 

 

 

 

P S

 

 

 

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O W

 

 

 

 

 

 

 

 

 

 

 

 

W I

 

 

 

 

 

 

 

 

 

CHOKE

 

 

E T

I

B

 

 

 

RIGHT

 

 

 

 

 

R C

 

 

 

 

 

 

 

 

 

H

N O

 

 

 

SWITCH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BOARD

 

 

 

 

 

 

P A

 

 

 

 

 

OUTPUT

 

 

 

U R

 

 

 

 

 

 

 

 

 

 

T

D

CONTROL SIGNALS

 

PWM

CAPACITOR

 

TERMINAL

 

 

 

 

 

 

 

 

DRIVE

VOLTAGE

 

THERMOSTATS

 

 

 

#1 AUX.

 

 

 

 

 

FEEDBACK

 

 

 

 

 

RECTIFIER

 

 

 

 

 

 

 

TOC

TOC

 

TRANS.

 

 

 

 

 

 

 

 

 

 

 

65VDC

 

 

 

 

 

CURRENT FEEDBACK

AUX.

 

 

 

 

 

 

CONTROL BOARD

 

 

 

 

 

 

 

 

 

 

 

VOLTAGE FEEDBACK

Section

Master

 

 

 

 

 

 

 

 

 

RECONNECT

#2AUX.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TRANS.

FAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOTOR

POWER

 

 

 

 

 

 

 

 

 

 

BOARD

 

 

 

 

 

 

to

to

 

 

 

 

 

 

40VDC

 

 

 

STATUS

Return

Return

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WIRE FEEDER

RS232

VOLTAGE

THERMAL

LIGHT

 

115VAC

 

 

 

 

 

 

RECEPTACLE

CONN.

SENSE

LIGHT

 

 

RECEPTACLE

 

 

 

 

RECEPTACLE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SWITCH BOARDS AND MAIN

 

 

 

 

TRANSFORMER

 

 

 

 

There are two switch boards in the INVERTEC® V450-

Each switch board feeds current to a separate, oppo-

TOC

TOC

PRO, each containing an input capacitor and insulated

sitely wound primary winding of the main transformer.

gate bipolar transistor (IGBT) switching circuitry. Refer

The reverse directions of current flow through the main

 

 

Section

Master

to Figure E.3. When the machine reconnect switches

transformer primaries and the offset timing of the IGBT

are configured for a lower input voltage (below 300

switch boards induce an AC square wave output signal

 

 

 

 

VAC) the input capacitors are connected in parallel.

at the secondary of the main transformer. These pri-

to

to

When the machine is configured for higher input volt-

mary currents are monitored by the current transformer

ages (300 VAC and above) the input capacitors are

(CT). If the primary currents become abnormally high,

Return

Return

connected in series.

the control board will shut off the IGBTs, thus disabling

 

 

 

 

 

 

machine output. The DC current flow through each pri-

 

 

When the input capacitors are fully charged they act as

mary winding is clamped back to each respective input

 

 

power supplies for the IGBT switching circuit. The

capacitor when the IGBTs are turned off. This is need-

 

 

Insulated Gate Bipolar Transistors switch the DC

ed due to the inductance of the transformer primary

 

 

power, from the input capacitors, “on and off” thus sup-

winding. The firing of the two switch boards occurs

 

 

plying pulsed DC current to the main transformer pri-

during halves of a 50 microsecond interval, creating a

 

 

mary windings. See IGBT Operation Discussion and

constant 20 kHz output.

 

 

Diagrams in this section.

 

 

to Section TOC

to Master TOC

 

 

 

 

 

NOTE: Unshaded areas of Block Logic

 

Return

Return

 

 

 

Diagram are the subject of discussion

 

 

 

 

 

 

 

 

 

 

 

 

 

INVERTEC® V450-PRO

Page 34 Page 36
Page 35
Image 35
Lincoln Electric SVM199-A service manual Figure E.3 Switch Boards and Main Transformer
Page 34 Page 36

SVM199-A specifications

Lincoln Electric SVM199-A is a highly advanced welding machine that has garnered attention for its robust features and innovative technologies. This piece of equipment is tailored specifically for professionals in the welding industry, providing a range of functionalities that enhance productivity and efficiency.

One of the standout features of the SVM199-A is its Dual Voltage Input capability. This allows for flexibility in energy sources, making it suitable for a variety of job sites and applications. Users can easily switch between 208V and 230V, ensuring that they can operate efficiently regardless of the electrical setup available.

The machine is equipped with a powerful inverter-based design that significantly reduces its overall weight without compromising performance. This technology not only increases portability but also delivers greater energy efficiency, resulting in lower operational costs. The inverter design allows for quicker arc starts and smoother operation, which is especially beneficial for intricate welding tasks.

The SVM199-A boasts advanced digital controls that simplify the operation for both novice and experienced welders. The intuitive interface allows users to easily set and monitor welding parameters, facilitating optimal settings for various materials and thicknesses. This level of control ensures consistent weld quality and minimizes the risk of defects.

Another impressive characteristic of the SVM199-A is its multi-process functionality. It supports MIG, TIG, and Stick welding, making it versatile for various applications, from thin sheet metal work to heavy-duty repairs. This adaptability is ideal for contractors and welding professionals who often switch between different welding processes.

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In summary, Lincoln Electric's SVM199-A stands out in the welding equipment market due to its combination of advanced technology, user-friendly design, and exceptional performance capabilities. Whether for industrial applications or specialized projects, this machine is engineered to meet the rigorous demands of professionals, making it a valuable addition to any welding toolkit.
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