Lincoln Electric SVM173-A service manual Theory of Operation, Power Wave 455/R

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E-2		THEORY OF OPERATION						E-2
	FIGURE E.2 – INPUT VOLTAGE AND PRECHARGE
			IGBT DRIVE		CT CURRENT	MAIN
			FROM
POWER WAVE 455/R			CONTROL		TO CONTROL	TRANSFORMER
			BOARD		BOARD
							OUTPUT DIODES	ELECTRODE
							D1 -D4	TERMINAL
		CAP. V/F						+
		FEEDBACK		LEFT
CR1	INPUT			SWITCH
				BOARD				+20 VDC FROM
	RECTIFIER
								POWER BOARD

				CURRENT		STT
RECONNECT	IGBT DRIVE					ELECTRODE
			STT CHOPPER	TRANSDUCER
	FROM					TERMINAL
SWITCH		CT CURRENT	BOARD
	CONTROL
		TO CONTROL
	BOARD						+
		BOARD
SW1	RIGHT
			STT
	SWITCH			CURRENT
CAP. V/F			DRIVE				WORK
FEEDBACK	BOARD		TRANSDUCER		OUTPUT
							TERMINAL
					CHOKE

INPUT

67A

S1

BOARD

VOLT

C

67B

U

SENSE

CONTACTOR AND PRECHARGE

S6

VOLTAGE SENSE

R

S

BOARD

OUTPUT

DEVICE NET

TO

R

T

CONTROL SIGNALS FROM

TO

E

T

CONTROL BOARD

S5

LEFT

RIGHT

N

VOLTAGE SENSE SELECT

GATEWAY

CONNECTION

S.B.

S.B.

T

F

2

FROM CONTROL

ARC LINK

BOARD

TO

F

B

ROBOT

4

BOARD

FEED

40 VDC

B

V

AUX

A

40 VDC

HEAD

TO FAN RELAY

IGBT

RECONNECT

C

RELAY

115 VAC

BOARD

DRIVES

CONTACTOR AND

FAN

ARC LINK

PRECHARGE

115 VAC

CONTROL SIGNALS

+5V RS232

52 VAC

65 VDC

CONNECTION

+5 V ARC LINK

CONTROL

THERMOSTATS

BOARD

BUS BOARD

DC

S6 TO WIRE

POWER

+5V SPI

S2 WORK

T1

DRIVE

SENSE

RECTIFIER

BUS

BOARD

+15V SPI

BOARD

40 VDC

+5 V

S3

230 VAC

WATER

40 VDC

+15 V

RS232

-15 V

COOLER

LEFT S.B.

CAP. V/F

40 VDC

+20 VDC

RIGHT S.B.

CAP. V/F

ARC LINK

TO

115 VAC

CHOPPER

115 VAC

RECP.

S1

WIRE

BOARD

LEFT CT

RIGHT CT

FEEDER

T2

CURRENT

CURRENT

RECP.

FB

FB

STATUS

THERMAL

LIGHT

LIGHT

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GENERAL DESCRIPTION

The Power Wave 455M/MSTT power source is designed to be a part of a modular, multi-process weld- ing system. It is a high performance, digitally con- trolled inverter welding power source capable of com- plex, high-speed waveform control. Depending upon configuration, it can support constant current, constant voltage, surface tension transfer and pulse welding modes. Each machine is factory preprogrammed with multiple welding procedures. Typically these proce- dures include GMAW, GMAW-P, FCAW, GTAW and

STT (Surface Tension Transfer) for a variety of materi- als such as mild steel, stainless steel, cored wires and aluminum. The STT process supports mild steel and stainless steel welding. PW455M/STT only.

The Power Wave 455M/STT has an output rating of either 450 amps at 38 volts or 400 amps at 36 volts. The two output ratings are dependent upon input volt- age and frequency. Both have a duty cycle of 100%. The STT process is rated at currents up to 325 amps at a 100% duty cycle.

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

POWER WAVE 455M/MSTT