Lincoln Electric SVM166-A service manual Display Board

E-5	THEORY OF OPERATION	E-5
	FIGURE E.5 – DISPLAY BOARD

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ELECTRODE INPUT VOLTAGE

TOROID

ASSEMBLY

FULL

WAVE

BRIDGE

CONTACTOR

	FEED	WELDING
	PLATE
GAS	M
SOLENOID	O	HALL
	T
"ELECTRODE"		EFFECT
	O
FEEDBACK	R	MODULE
VOLTAGE #67

ARMATURE

RPM FEEDBACK

TOC

ON/OFF

SWITCH

MOV

WORK SENSING LEAD

BOOST POWER SUPPLY BOARD

FEED HEAD BOARD SUPPLY

DRIVE MOTOR SUPPLY

FEED HEAD

CONTROL BOARD

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"WORK" VOLTAGE FEEDBACK #21

SPI COMMUNICATIONS

SHIELDED CABLE

COLD		TRIGGER	TRIGGER
	WIRE			DISPLAY
		INPUT &	INTERLOCK
INCH	FEED			BOARD
		PROCEDURE	SWITCH
SWITCH	SPEED
	CONTROL

DISPLAY BOARD

The Display Board provides information to the user through digital displays and LED’s. The Display Board communicates with the Feed Head Board via the SPI Bus cable.

The wire feed speed display shows the rate that the LN-15 will feed wire during the welding process. The wire feed speed is calibrated to within +/-2%. It always displays the preset WFS.

The arc voltage display shows the average actual arc voltage during the welding process. When welding ceases the average arc voltage will continue to be shown for 5 seconds. When not welding the display show “----“. The voltage is calibrated to +/-2% over a

range of 10 to 45VDC. A negative “-“ will be automat- ically displayed when the LN-15 is configured for elec- trode negative processes.

All of the LEDs will briefly light when the machine is first turned on.

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

LN-15