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Section e - theory of operation – Lincoln Electric V155-S User Manual

Page 25

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TABLE OF CONTENTS-THEORY OF OPERATION SECTION

E-1

E-1

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INVERTEC® V155-S

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-1

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2

Input Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-3

Main IGBT Inverter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4

Main Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4

Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-5

Insulated Gate Bipolar Transistor (IGBT) Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-6

Pulse Width Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-7

FIGURE E.1 — BLOCK LOGIC DIAGRAM.

CONTROL BOARD

W05X0708-1

(SCHEMATIC: X0708)

JP1

INPUT BOARD

W05X0701

(SCHEMATIC: X0701)

115/230Vac

50/60 Hz

ON/OFF SWITCH

5

2

N

L

G

WIRE TIE

4

1

BLUE

WHITE

WHITE

BLUE

WHITE

BLACK

AC2

AC1

PE

PWR2

PWR1

PWR4 PWR3

DC+

RED

DC-

BLACK

PCB CONNECTOR CAVITY NUMBERING SEQUENCE

(VIEWED FROM COMPONENT SIDE OF P.C. BOARD)

RIBBON CABLE

TWISTED CABLE

1

FAN

WHITE

RED

4

2

4 PINS

1

PE

RECONNECT

BOARD

W05X0408

(SCHEMATIC: X0408)

BLACK

JP4

BLUE

16

16 PINS

15

JP1

JP1

DC+

RED

DC-

BLACK

Y/G PE

INVERTER BOARD

W05X0519

(SCHEMATIC: X0519)

BLACK

RED

JP2

WHITE

W

HIT

E

P1

N1

BL

AC

K

RE

D

SHUNT

-

+