Lincoln Electric SVM104-A service manual High Voltage / High

E-3 THEORY OF OPERATION

Return to Section TOC	Return to Master TOC	FIGURE E.4 - High Voltage/High Frequency and By-Pass Circuit
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Section TOC	Master TOC	HIGH VOLTAGE / HIGH
to	to
		FREQUENCY AND BY-PASS
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		CIRCUIT

		The control board passes the 115vac through the		torch terminal. This momentary burst of high fre-
		CR2 relay contacts to the primary of the high volt-		quency is used to ignite the pilot arc.
		age transformer. The secondary of the high volt-
		age transformer delivers a high voltage to the		The by-pass board is necessary to prevent any
		spark gap generator and also to the high frequen-		unwanted signals from interfering with the Pro-
		cy transformer. The high frequency transformer		Cut 60 circuitry.
to Section TOC	to Master TOC	transfers the high frequency "spark" to the
Return	Return		NOTE: Unshaded areas of Block Logic
			Diagram are the subject of discussion
		PRO-CUT 60