Lincoln Electric 655/R Manual Do Utilizador

TABLE OF CONTENTS - THEORY OF OPERATION

E-1

Retur

POWER WAVE 655/R

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

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

Input Voltage and Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-3

Switch Boards and Main Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4

DC Bus Board, Power Board, Feed Head Board, Gateway Board

and Voltage Sense Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-5

Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-7

Output Rectifier, and Output Choke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-8

Thermal Protection, Protective Circuits, Over Current Protection

and Under/Over Voltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-9

Insulated Gate Bipolar Transistor (IGBT) Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-10

Pulse Width Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-11

FIGURE E.1 — BLOCK LOGIC DIAGRAM.

INPUT
BOARD

LEFT
SWITCH
BOARD

RIGHT
SWITCH
BOARD

INPUT
RECTIFIER

CR1

GATEWAY
BOARD

DC
BUS
BOARD

FEED
HEAD
BOARD

POWER
BOARD

CONTROL
BOARD

OUTPUT
CHOKE

ELECTRODE
TERMINAL

THERMOSTATS

AUX
RECONNECT

RELAY

WATER
COOLER

115 VAC
RECP.

115 VAC
FAN

ARC LINK
WIRE
FEEDER
RECP.

CONNECTION

TO WIRE

DRIVE

VOLT

SENSE
BOARD

MAIN
TRANSFORMER

CONTACTOR AND PRECHARGE
CONTROL SIGNALS FROM
CONTROL BOARD

FROM CONTROL
BOARD

2
4
V
A
C

115 VAC

52 VAC

230 VAC

40 VDC

ARC LINK

CONNECTION
TO
ROBOT

VOLTAGE SENSE
OUTPUT

CAP. V/F

FEEDBACK

CAP. V/F

FEEDBACK

IGBT DRIVE
FROM
CONTROL
BOARD

CT CURRENT
TO CONTROL
BOARD

-15 V

+15 V

+5 V

+5 V ARC LINK

+5V RS232

+15V SPI

STATUS

THERMAL

LIGHT LIGHT

S2 WORK
SENSE

LEFT S.B.
CAP. V/F

RIGHT S.B.
CAP. V/F

S3
RS232

LEFT CT

CURRENT
FB

C
U
R
R
E
N
T

F
B

ARC LINK

IGBT
DRIVES

TO
LEFT
S.B.

TO
RIGHT
S.B.

67A

67B

SW1

BUS BOARD
RECTIFIER

CURRENT
TRANSDUCER

OUTPUT DIODES
D1 -D4

115 VAC

40 VDC

DEVICE NET

VOLTAGE SENSE SELECT

IGBT DRIVE
FROM
CONTROL
BOARD

+5V SPI

RIGHT CT

CURRENT
FB

TO FAN RELAY

CONTACTOR AND
PRECHARGE
CONTROL SIGNALS

65 VDC

WORK
TERMINAL

POWER WAVE 655/R

380-
  415
440-
  460
550-
  575

ETHERNET/

HARMONIC
FILTER

POS

NEG

Auxiliary
Fan