Lincoln Electric SVM158-A service manual Table of Contents Theory of Operation Section

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Section E-1Section E-1

TABLE OF CONTENTS

-THEORY OF OPERATION SECTION-

Theory of Operation	Section E
General Description	E-2
Input Line Voltage, Auxiliary Transformer and Precharge	E-2
Switch Board and Main Transformer	E-3
Power board, Control Board, and SPI Communications	E-4
Output Rectifier and Choke	E-5
Thermal Protection	E-6
Protection Circuits	E-6
Over current Protection	E-6
Under/Over Voltage Protection	E-6
Insulated Gate Bipolar Transistor (IGBT) Operation	E-7
Pulse Width Modulation	E-8
Minimum/Maximum Output	E-8

FIGURE E.1 – V350-PRO BLOCK LOGIC DIAGRAM

			Main Switch Board						To Control
									Board
									Feedback	Current
	Input									Positive
Input switch					Primary					Output
	Rectifier									Terminal
					Current
					Sensor
		Reconnect							Choke	Negative
										Output
		Switch								Terminal
					Primary				Sense
					Current
					Sensor
		Fan	ControlanF					IGBTDriveSignal	VoltageOutput
24VAC		115VAC Fan Supply			Primary Current Feedback
					Input Relay Control
Auxiliary					Soft Start Control
115VAC, 42VAC Transformer				V/F Capacitor Feedback (2)
		Machine Control Supply
		+15VDC, -15VDC, +5VDC
		Power
		Board SPI Supply +15VDC +5VDC						Control Board
28VAC	40VDC
14 Pin		RS232 Supply +5VDC
										RS232
Amphenol
					SPI Communications				& +15VDC, +5VDC Supply
		Remote Control & Trigger			Remote		Mode		Advanced
							Panel		Display	Process
					Board				Panel
							(Not used if APP			Panel
							is in place)
6 Pin					12
					VDC
Amphenol
			Output	Weld		Optional Solenoid
			Control	Terminals
		Output
		Potentiometer
				V350-PRO