Lincoln Electric V350-PRO User Manual download pdf (Page 32)

FIGURE E.2 – INPUT VOLTAGE AND PRECHARGE

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

GENERAL DESCRIPTION

The Invertec V350-Pro is an inverter based welding

power source that offers multi mode constant voltage

(CV) and constant current (CC) welding and is rated at

350 amps 34VDC at a 60% duty cycle. The Invertec

V350-Pro is available in either a construction version

(no wire feeder connection or auxiliary power ) and a

factory version that includes a wire feeder connection

and related power.

INPUT LINE VOLTAGE, AUXILIARY

TRANSFORMER, & PRECHARGE

The Invertec V350-Pro can be connected for a variety

of three-phase or single-phase input voltages. The ini-

tial power is applied to the V350 through a combina-

tion line switch/circuit breaker located on the front of

the machine. Two phases of the input voltage are

applied to the auxiliary transformer. The auxiliary trans-

former develops four different secondary voltages.

The 115VAC is used to power the fan motor and also

is applied to the 14 pin amphenol type connector for

wirefeeder operation. The 24VAC and 42VAC volt-

ages are also applied to the 14 pin amphenol type con-

nector to power wirefeeders. The 28VAC is rectified

and the resultant 40VDC is applied to the power board.

The input voltage is rectified by the input rectifier and

the resultant DC voltage is applied to the switch board

through the reconnect switch assembly located at the

rear of the machine. The reconnect switch connect the

two pairs of input capacitors either in a parallel (lower

voltage) or series (higher voltage) configuration to

accommodate the applied input voltage.

During the precharge time the DC input voltage is

applied to the input capacitors through a current limit-

ing circuit. The input capacitors are charged slowly

and current limited. A voltage to frequency converter

circuit located on the switch board monitors the

capacitor voltages. This signal is coupled to the con-

trol board. When the input capacitors have charged

to an acceptable level, the control board energizes the

input relays, that are located on the switch board,

making all of the input power, without current limiting,

available to the input capacitors. If the capacitors

become under or over voltage the control board will

de-energize the input relays and the V350 output will

be disabled. Other possible faults may also cause the

input relays to drop out.

THEORY OF OPERATION

E-2 E-2

V350-PRO

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

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Lincoln Electric V350-PRO User Manual Page 32

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