Lincoln Electric SVM140-A Theory of Operation, Input Line Voltage Contactor and Main Transformer

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E-2 E-2

THEORY OF OPERATION

FIGURE E.2 – INPUT LINE VOLTAGE

										WORK
										NOZZLE
			POWER BOARD						ELECTRODE
							MAIN			TORCH
			CR 1				TRANSFORMER	OUTPUT BOARD		CONNECTOR
			RELAY
										E
INPUT			IGBT							L
LINE	INPUT									E
										C
SWITCH	RECTIFIER									T
										R
			CAPACITOR							O
										D
									CHOKE	E
		R								S
		E	IGBT					PILOT		O
		C						TRANSISTOR		L
										E
		O
										N
		N
		N								O
		E								I
										D
		C	IGBT
		T
					CURRENT
		S			TRANSFORMER				TRIGGER & SAFETY
		W
		I	CAPACITOR							AIR
		T
		C								SOLENOID
		H
			IGBT
	AIR	P					TRIGGER & SAFETY
		R
	PRESSURE	O
	SWITCH	T	CR 1	IGBT
	"A"	E	RELAY
		C	DRIVE	GATE
		T		SIGNALS
			SIGNAL				ELECTRODE & TRANSFER
	L	I
		O					CURRENT FEEDBACK
	E	N	SIGNAL
							PILOT ENABLE
	A			CONTROL BOARD			ELECTRODE SOLENOID ENABLE
	D
							AIR SOLENOID ENABLE
			18/36VAC
				R	A	T	S
				E	I	H	A
			THERMOSTATS		R	E	F
				A
					L	R	E
				D		M	T
				Y	O	A	Y
FAN					W	L
			OUTPUT
MOTORS
			CONTROL
				DISPLAY BOARD
								12VAC
									24VAC

AUXILIARY

TRANSFORMER

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GENERAL DESCRIPTION

The Pro-Cut 55 is a constant current, continuous con- trol plasma cutting power source. The inverter based power supply design is controlled by a microprocessor control board. The control system has a safety mech- anism to insure that the nozzle and electrode are in place before cutting or gouging. The Pro-Cut 55 initi- ates the plasma arc with a simple, yet reliable, touch start mechanism. This system eliminates many of the problems associated with hi-frequency type start sys- tems.

INPUT LINE VOLTAGE,

CONTACTOR AND MAIN

TRANSFORMER

The single-phase or three-phase input power of 200- 230 or 400 to 460 volts AC is connected to the machine, via an input line cord, to a switch located on the front panel.

A reconnect panel and voltage range switch allow the user to configure the machine for either a low or high input voltage and also connect the auxiliary trans- former for the appropriate input voltage.

The auxiliary transformer develops the appropriate AC voltages to operate the cooling fans, the control board and the plasma output board.

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

PRO-CUT 55