Lincoln Electric V350-PRO User Manual download pdf (Page 34)

THEORY OF OPERATION

E-4 E-4

V350-PRO

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FIGURE E.4 – POWER BOARD, CONTROL BOARD

AND SERIAL PERIPHERAL INTERFACE (SPI) COMMUNICATIONS

Remote

Board

Mode

Panel

Status

Panel

Display

Panel

Control Board

Choke

Positive

Output

Terminal

Negative

Output

Terminal

To Control

Board

Current

Feedback

Reconnect

Switch

Output Voltage Sense

Input switch

& 100A Breaker

Input

Rectifier

Auxiliary

Transformer

Fan

Power

Board

14 Pin

Amphenol

6 Pin

Amphenol

Remote Control & Trigger

Solenoid Supply

40VDC

RS232 Supply +5VDC

SPI Supply +15VDC +5VDC

Machine Control Supply

+15VDC, -15VDC, +6VDC

40VDC

28VAC

24VAC

115VAC, 42VAC

Main Switch Board

115VAC Fan Supply

Optional Solenoid

SPI Communications & +15VDC, +5VDC Supply

Fan Control

V/F Capacitor Feedback (2)

Soft Start Control

Input Relay Control

Primary Current Feedback

IGBT Drive Signal

Primary

Current

Sensor

Primary

Current

Sensor

POWER BOARD, CONTROL BOARD

AND SERIAL PERIPHERAL INTER-

FACE (SPI) COMMUNICATIONS

POWER BOARD

The 28VAC auxiliary is rectified and filtered and applied

to the power board. The power board, utilizing a

switching power supply, processes the 40VDC input

and develops several regulated positive and negative

DC supplies. Three DC supplies are fed to the control

board for machine control supplies. Two positive DC

voltages are coupled to the control board for the Serial

Peripheral Communications (SPI) supplies. A +5VDC

is used for the RS232 connection supply and a

+40VDC is fed to the remote board to power an

optional gas solenoid. An over or under input voltage

detection and shutdown circuit is also part of the

power board’s circuitry.

CONTROL BOARD

The control board performs the primary interfacing

functions to establish and maintain output control of

the V350 machine. The control board sends and

receives command signals from the mode panel, the

status panel, the display panel and /or the optional

remote panel. These communications are processed

through a digital network called a Serial Peripheral

Interface (SPI). This network digitally communicates to

and from the control board the user’s commands and

various machine status messages. The software that

is contained within the control board processes and

compares these commands with the voltage and cur-

rent feedback information it receives from the output

current sensor and the output voltage sensing leads.

The appropriate pulse width modulation (PWM) signals

(See Pulse Width Modulation in this section) are sent

to the switch board IGBTs. In this manner, the digital-

ly controlled high-speed welding waveform is created

and regulated.

The control board also monitors the thermostats, the

main transformer primary currents and the input

capacitor voltages.

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

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Lincoln Electric V350-PRO User Manual Page 34

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