Lincoln Electric INVERTEC V250-S Bedienungsanleitung PDF herunterladen (Seite 29)

E-5

THEORY OF OPERATION

E-5

OUTPUT RECTIFICATION

AND CONTROL

The AC output from the main transformer secondary

is rectified to a DC output and applied to the output

terminals. Output voltage and current feedback infor-

mation, which is fed to the control board, is sensed at

the output terminals and shunt. The control board

monitors the panel controls and remote control recep-

tacle and compares these commands to the feedback

information to determine how the output should be

controlled to optimized welding results. The control

board controls the IGBT switching through pulse width

modulation circuitry. See

IGBT Operation

Discussion

in this section.

FIGURE E.4 OUTPUT RECTIFICATION AND CONTROL

INVERTEC V250-S

INPUT

LINE

SWITCH

INPUT

RECTIFIER

AUXILIARY

TRANSFORMER

FAN

MOTORS

POWER BOARD

MAIN

TRANSFORMER

SHUNT

POSITIVE

OUTPUT

TERMINAL

NEGATIVE

OUTPUT

TERMINAL

THERMAL

LIGHT

REMOTE

RECEPTACLE

OUTPUT

CONTROL

STRIKE

CONTROL

ARC

FORCE

CONTROL

MODE

SWITCH

LOCAL/

REMOTE

SWITCH

RELAY

CAPACITOR

IGBT

CURRENT

TRANSFORMER

18VAC

GATE SIGNALS

THERMOSTATS

O

V

E

R

V

O

L

T

A

G



PROTECTION SIGNAL

CR1 RELAY DRIVE SIGNAL

CR1

IGBT

CONTROL BOARD

L

E

A

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

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