Lincoln Electric SVM185-A service manual Power Feed 25M, Figure E.3 GAS Solenoid Controls

E-3	THEORY OF OPERATION	E-3
	FIGURE E.3 - GAS SOLENOID CONTROLS

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		VOLTAGE
		SENSE
	LEAD #67A	LEAD #67
	PUSH PULL
	DAUGHTER		DRIVE
			MOTOR
	CONTROL BOARD
TO POWER	FEEDHEAD	FEEDBACK	TACH
SOURCE
		STATUS LED
	DIP SWITCHES		GUN TIGGER AND
INPUT			DUAL PROCEDURE
NETWORK			RECEPTACLE
RECEPTACLE

	HEATER LIGHT			2-STEP/
				4-STEP
CONNECTOR
FOOT AMPTROL		COLD GAS
		INCH/ SOLENOID
			GAS
		PURGE

GEAR BOX

AND

CONDUCTOR

BLOCK

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POWER FEED® 25M

The POWER FEED® 25M is a two roll, high perfor- mance, digitally controlled, modular wire feeder that operates on 40 VDC input power. It is designed to be a part of a modular, multi-process welding system. Refer to Figure E.2.

Network communications, intelligence, PC board input power, and arc voltage feedback is received and transmitted through the input network receptacle.

The feed head drive control board processes the information it receives from the various user operated switches such as the gun trigger, 2-step/4-step, and cold inch switches and sends this information to other system components. This information is evaluated and the correct commands are transmitted to the feed head drive. The feed head drive control board then sends the signals to energize the active components such as the solenoid and wire drive motor. The tach feedback signal is processed on the feedhead board which regulates the motor armature voltage so as to maintain the required wire feed speed.

When the gun trigger is pulled, the voltage sense board relays the electrode sense signal to the input network receptacle for processing by the power source.

The STATUS LED is designed to blink a red and green code if a fault should occur.

There is one DIP switch bank located on the wire feedhead drive board. It is labeled S1 and is used to set gear ratios and arc polarity.

GAS SOLENOID

The gas solenoid permits the POWER FEED® 25M to be used for gas metal arc welding (GMAW) processes. When the gun trigger circuit is activated, the control board signals the solenoid to activate, which allows sheilding gas to flow through the gun to the arc.

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

POWER FEED® 25M