Lincoln Electric SVM100-A Theory of Operation Section, Power Supply Block Logic Diagram

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TABLE OF CONTENTS	Section E
- THEORY OF OPERATION SECTION -

Theory of Operation Section	Section E
Power Supply Operation	E-1 - E-5
Input Line Voltage and Main Transformer	E-1
Output Rectification and Feedback Control	E-2
High Voltage / High Frequency Circuit	E-3
DC Welding Output	E-4
AC Welding Output	E-5
SCR Operation	E-6
Thermal Protection	E-7

		POWER SUPPLY BLOCK LOGIC DIAGRAM
				POLARITY				BY-PASS
								BOARD
				SWITCH
								WORK
								HI-FREQ
								TRANSFORMER
LINE								ELECTRODE
	MAIN
SWITCH
TRANSFORMER
R	X2		AC		DC+
E						SHUNT
				SCR
C
				BRIDGE
O
N
N
E	X1		AC		DC-
C						CHOKE
T
		SIGNALSGATE
POWER								FEEDBACK
FACTOR
CAPACITORS
				ARC START				LCD DISPLAY
	115VAC	PROTECTION		115 VAC		CONTROL		KEYPAD
FAN
		SNUBBER		GATE SIGNALS		BOARD		LED
		BOARD						BOARD
					HI-FREQ			KEYPAD
					115 VAC
		115
		VAC			24 VAC
				CONTROL		18 VAC
	115 VAC			TRANSFORMER
						16 VAC
RECEPTACLE
		115 VAC				HIGH VOLTAGE	HIGH FREQUENCY SPARK
						TRANSFORMER
	REMOTE
						CIRCUIT
	RECEPTACLE

NOTE: On subsequent pages areas of this diagram that are the topic of discusstion are shown in white, other portions of the circuit are shaded.

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