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E-2

THEORY OF OPERATION

E-2

 

 

 

 

FIGURE E.2 - INPUT VOLTAGE AND PRECHARGE.

 

 

 

 

 

 

 

 

 

MAIN

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

CURRENT

 

 

 

 

 

 

 

 

 

 

SENSOR

 

 

 

 

 

 

LEFT

 

 

 

 

 

 

 

 

 

 

SWITCH

 

 

 

 

 

 

 

 

 

BOARD

 

 

OUTPUT

 

 

 

 

 

 

PWM

 

 

 

TERMINAL

 

 

 

 

 

 

 

 

 

 

 

INPUT

 

INPUT

 

 

DRIVE

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OW

 

 

 

 

 

 

 

 

 

 

W I

 

 

 

 

 

 

 

 

 

CHOKE

E T

I

B

 

 

 

RIGHT

 

 

 

R C

 

 

 

 

 

 

 

H

N O

 

 

 

SWITCH

 

 

 

 

 

 

 

BOARD

 

 

 

 

P A

 

 

 

 

 

 

 

U R

 

 

 

 

 

 

 

OUTPUT

 

T

D

CONTROL SIGNALS

 

PWM

CAPACITOR

 

TERMINAL

 

 

 

 

 

 

DRIVE

VOLTAGE

 

THERMOSTATS

 

#1 AUX.

 

 

 

 

 

FEEDBACK

 

 

 

RECTIFIER

 

 

 

 

 

 

 

 

TRANS.

 

 

 

 

 

 

 

 

 

 

 

65VDC

 

 

 

 

 

CURRENT FEEDBACK

AUX.

 

 

 

 

 

 

CONTROL BOARD

 

 

 

 

 

 

 

 

 

 

 

VOLTAGE FEEDBACK

RECONNECT

#2AUX.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TRANS.

FAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOTOR

POWER

 

 

 

 

 

 

 

 

 

 

BOARD

 

 

 

 

 

 

 

 

 

 

 

 

40VDC

 

 

 

STATUS

 

 

 

 

 

 

WIRE FEEDER

RS232

VOLTAGE

THERMAL

LIGHT

 

115VAC

 

 

 

 

 

 

RECEPTACLE

CONN.

SENSE

LIGHT

 

 

RECEPTACLE

 

 

 

 

RECEPTACLE

 

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POWER  SOURCE

GENERAL DESCRIPTION

The INVERTEC® V450-PRO is an inverter based welding power source that is designed to be a multi- process welding system. It is a high performance, dig- itally controlled inverter capable of complex, high- speed waveform control. With the appropriate modu- lar components it can support constant current, con- stant voltage and pulse welding processes. The output rating is 450 amps at 36 volts with a 100% duty cycle.

INPUT VOLTAGE AND

PRECHARGE

The INVERTEC® V450-PRO can be connected for a variety of three phase voltages. Refer to Figure E.2. The initial input power is applied to the INVERTEC® V450-PRO through a line switch located on the front of the machine. Two phases of the three-phase input power is applied to the input board and both auxiliary transformers. The various secondary voltages devel- oped by the #1 auxiliary transformer are applied to the input board, the power board rectifier and the fan motor. The 115 VAC secondary voltage developed by the No. 2 auxiliary transformer is applied to the 115 VAC receptacle.

The 65 VDC produced from the power board rectifier is utilized by the power board to provide various DC volt- ages for the control board and wire feeder.

The two phases, which are connected to the input board through the power switch, are connected to the input rectifier. During precharge or “soft start” these two phases are current limited by the input board. This AC input voltage is rectified, and the resultant DC volt- age is applied through the reconnect switches to the input capacitors located on the switch boards. The control board monitors the voltage across the capaci- tors. When the capacitors have charged to an accept- able level, the control board signals the input board to energize the main input contactor making all three phases of input power, without current limiting, avail- able to the input capacitors. At this point, the INVERTEC® V450-PRO is in the “Run Mode” of oper- ation. If the capacitors become under or overvoltage, the control board will signal the input board to de- energize the main input contactor, and the INVERTEC® V450-PRO will be disabled.

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

INVERTEC® V450-PRO

Page 34
Image 34
Lincoln Electric SVM199-A service manual Theory of Operation, Power Source General Description, Input Voltage Precharge

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.

Additionally, the machine features a robust cooling system designed to prevent overheating during extended use. This capability not only prolongs the lifespan of the machine but also ensures reliable performance even in demanding conditions. The SVM199-A is built to withstand the rigors of frequent usage, emphasizing Lincoln Electric’s commitment to durability and quality.

Safety is paramount in welding operations, and the SVM199-A incorporates several safety features, including thermal overload protection and a protective housing design. These elements work together to safeguard both the machine and the operator, promoting a secure working environment.

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.