Lincoln Electric SVM172-A service manual Power Feed 10M Feed Head

E-2	THEORY OF OPERATION	E-2
	FIGURE E.2 – POWER FEED 10M FEED HEAD

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VOLTAGE

SENSE

LEAD #67A LEAD #67

				DRIVE
				MOTOR
	CONTROL BOARD
TO POWER			FEEDBACK	TACH
SOURCE OR
	SHUTDOWN
CONTROL BOX			STATUS LED
		DIP SWITCHES		GUN TRIGGER AND
	INPUT			DUAL PROCEDURE
NETWORK				RECEPTACLE
RECEPTACL
			2-STEP/
			4-STEP
NETWORK			NETWORK
CONNECTOR
	COLD	GAS	OUTPUT
			RECEPTACL
	INCH/ SOLENOID
	GAS
	PURGE

GEAR BOX

AND

CONDUCTOR

BLOCK

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POWER FEED 10M FEED HEAD

The Power Feed 10M is a four roll, high performance, 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 recepta- cle. The internal network connector plug is utilized

when the Control Box is mounted directly to the wire drive unit. See System Diagram A in this section.

The feed head drive control board processes the information it receives from the various user operated switches sch as the gun trigger, 2-step/4-step, and cold inch switches and sends this information to other system components. This information is evalu- ated 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 compnents such as the solenoid and wire drive motor. The tach feedback signal is processed on the

control 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 Control Box.

The optional shutdown feature can be implemented as a means of stopping the wire feeding in the event that the water cooler (if used) is not turned on.

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 drive control board. It is labled S1 and is used to set gear ratios, arc polarity, and for network indentifica- tion purposes.

POWER FEED 10M SINGLE/DUAL