Lincoln Electric SVM101-B Theory of Operation, Input Line Voltage & Auxiliary Transformer

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E-2	THEORY OF OPERATION			E-2
	FIGURE E-2 --- INPUT CIRCUITS
	POWER SWITCH
	SECTIONS	MAIN		RECTIFIER
	20KHZ		CHOKE
		TRANSFORMER
				HEATSINK
	LEFT SWITCH BOARD

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	LINE
	SWITCH
1
2
3	3A
FAN	AUXILIARY
	TRANSFORMER

TO

WIREFEEDER

		FET MODULES			TOP
		CAP
					1 DIODE
		FET MODULES		CURRENT
1ø OR 3ø DETETCTION (H5)
				TRANSFORMER
	PRE-CHARGE
INPUT	DRIVER
RECTIFIER	BOARD			CONTROL	5 DIODES
	CR1
				BOARD
AC1		PROTECTION
	PULSE
AC2		BOARD		Y-Y FEEDBACK	BOTTOM
	TRAIN
AC3
	CR2
A-LEAD
24VDC	PRE-CHARGE
		RIGHT SWITCH BOARD
18VAC	2ND STEP PWM	FET MODULES			5 DIODES
24VAC	POWERBOARD	CAP
					TOP
		FET MODULES
	<1 VDC
					1 DIODE
					CHOKE	CHOKE
	LOCAL	METER MODE	POT	POT	VOLTAGE FEEDBACK
	REMOTE
	1ST STEP PWM VOLTAGE				CURRENT FEEDBACK-PROTECTION	SHUNT
	15VDC-CONTROL BOARD FUNCTION VOLTAGE
	24VAC-THERMOSTATS-GUN TRIGGERING

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INPUT LINE VOLTAGE & AUXILIARY TRANSFORMER

The V300-I can be connected for a variety of three phase or single phase input voltages. Power is applied through the Line Switch to the Input Rectifier and the Auxiliary Transformer.

The Reconnect Panel has switches to select high or low operating voltage. The “A” lead must then be set for the proper input voltage. It is important to set the switches and “A” lead to the proper positions before applying input power. Changing the switch position with the power applied will result in major damage to the machine

The auxiliary transformer provides 18v.a.c. and 24v.a.c. supplies to the Control and Power Boards. It also provides 115v.a.c., 42v.a.c. and 24v.a.c. supplies to the wirefeeder amphenol. (CE machines do not have 115v.a.c. supply)

The Power Board provides a 15v.d.c. supply to the Control Board and a 24v.d.c.supply to the Driver Board to operate the Pre-charge Relays.

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NOTE: Unshaded areas of block logic diagram are the subject of discussion

V300-I