Lincoln Electric SVM146-A Theory of Operation, Input Line VOLTAGE, Switch and Main Transformer

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E-2			THEORY OF OPERATION					E-2
			FIGURE E.2 – INPUT LINE VOLTAGE
								WORK
								NOZZLE
			POWER BOARD				ELECTRODE
					MAIN			TORCH
			CR 1&2			OUTPUT	BOARD	CONNECTOR
					TRANSFORMER
			RELAY
								E
INPUT			IGBT					L
LINE	INPUT							E
								C
SWITCH	RECTIFIER							T
								R
			CAPACITOR					O
								D
								E
		R					CHOKE	S
		E	IGBT				PILOT	O
		C				TRANSISTOR		L
		O						E
								N
		N
								O
		N
								I
		E
								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						REMOTE
	SWITCH	T	CR 1& 2	IGBT
	"A"	E	RELAY					INTERFACE
		C	DRIVE	GATE				RECEPTACLE
		T		SIGNALS
			SIGNAL		ELECTRODE & TRANSFER
	L	I
		O			CURRENT FEEDBACK
	E	N	SIGNAL
					PILOT ENABLE
	A			CONTROL BOARD	ELECTRODE SOLENOID ENABLE
	D
			18/36VAC		AIR SOLENOID ENABLE

	R	A	T	S
	E	I	H	A
		R	E	F
THERMOSTATS	A
		L	R	E
	D		M	T
	Y	O	A	Y
		W	L

OUTPUT

CONTROL

DISPLAY BOARD

12VAC

24VAC

115VAC

AUXILIARY

TRANSFORMER FAN

MOTOR

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GENERAL DESCRIPTION

The PRO-CUT 80 is a constant current, continuous control plasma cutting power source. The inverter based power supply design is controlled by a micro- processor control board. The control system has a safety mechanism to insure that the nozzle and elec- trode are in place before cutting or gouging. The PRO- CUT 80 initiates the plasma arc with a simple, yet reli- able, touch start mechanism. This system eliminates many of the problems associated with hi-frequency type start systems. When powered up, the machine performes some rudimentary self diognostics.

INPUT LINE VOLTAGE, SWITCH AND MAIN TRANSFORMER

The single-phase or three-phase input power is con- nected 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 fan, 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 80