Lincoln Electric SVM135-B service manual Output Rectifier, Choke

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E-8

THEORY OF OPERATION E-8

FIGURE E.7 — OUTPUT RECTIFIER AND CHOKE.

									MAIN
									TRANSFORMER	CURRENT
										SENSOR
						LEFT
						SWITCH
						BOARD				OUTPUT
						PWM				TERMINAL
	INPUT		INPUT			DRIVE
	CONTACTOR		RECTIFIER
				R	S
				E	W
				C			PRIMARY
				O	I		CURRENT
				N	T		SENSOR
				N		CAPACITOR
				E	C	VOLTAGE
				C	H	FEEDBACK
				T
P S
O W
W I
T						RIGHT				CHOKE
E C	I	B
R H						SWITCH
	N O
						BOARD
	P A
	U R									OUTPUT
	T	D	CONTROL SIGNALS			PWM	CAPACITOR			TERMINAL
						DRIVE	VOLTAGE			THERMOSTATS
	#1 AUX.						FEEDBACK
			RECTIFIER
	TRANS.
			65VDC							CURRENT FEEDBACK
							CONTROL BOARD
AUX.										VOLTAGE FEEDBACK
RECONNECT	#2AUX.
	TRANS.		FAN
			MOTOR	POWER
				BOARD
						40VDC				STATUS
						WIRE FEEDER	RS232	VOLTAGE	THERMAL	LIGHT
	115VAC							SENSE	LIGHT
						RECEPTACLE	CONN.
	RECEPTACLE							RECEPTACLE

OUTPUT RECTIFIER	rectifies it to a DC voltage level. Since the
AND CHOKE	output choke is in series with the negative
	leg of the output rectifier and also in series
The output rectifier receives the AC output	with the welding load, a filtered DC output is
	applied to the machine output terminals.
from the main transformer secondary and	Refer to Figure E.7.

POWER WAVE 455/POWER FEED 10