Lincoln Electric V250-S service manual General Description, Input Line Voltage

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E-2 THEORY OF OPERATION E-2

GENERAL DESCRIPTION

The Invertec V250-S is a 250 amp arc welding power source that utilizes either single or three phase input power to produce a constant current output. The output response of this machine has been optimized for the SMAW and TIG welding processes.

FIGURE E.1 - INPUT VOLTAGE CIRCUITS

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INPUT

INPUTRECTIFIER LINE

SWITCH

"A"

L

E

A

D

FAN

MOTORS

R

E

C

O

N

N

E

C

T

S

W

I

T

C

H

18VAC

POWER BOARD		MAIN
		TRANSFORMER
CR1
RELAY
IGBT
			POSITIVE
CAPACITOR			OUTPUT
			TERMINAL
IGBT
IGBT		SHUNT
	CURRENT
	TRANSFORMER		NEGATIVE
CAPACITOR		F	OUTPUT
			TERMINAL
		E	F
IGBT		E	E
		D	E
		B	D
		A	B
		C	A
O		K	C
V
E		THERMOSTATS	K
R
V
O
L
T	IGBT GATE SIGNALS		THERMAL
A
G
E	PROTECTION SIGNAL	CONTROL BOARD	LIGHT
CR1 RELAY DRIVE SIGNAL

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AUXILIARY

TRANSFORMER

REMOTE

RECEPTACLE

OUTPUT STRIKE ARC			LOCAL/
		MODE
			REMOTE
CONTROL CONTROL FORCE	SWITCH
CONTROL			SWITCH

INPUT LINE VOLTAGE

The single-phase or three-phase input power of 208, 230 or 460 volts AC is connected to the machine, through a line switch located on the front panel.

A reconnect panel and switch allows the user to con- figure the machine for either a low or high input volt- age and also connect the auxiliary transformer for the appropriate input voltage.

The auxiliary transformer develops the appropriate AC voltages to operate the cooling fans and the control board.

NOTE: Unshaded areas of block logic diagrams are the subject of discussion.

INVERTEC V250-S