Lincoln Electric POWER FEED 25M Service Manual page 69

E-1 TABLE OF CONTENTS-THEORY OF OPERATION SECTION
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-1
General Physical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2
General Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2
POWER FEED® 25M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-3
Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4
Component Status Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-5
TO POWER
SOURCE
INPUT
NETWORK
RECEPTACLE
CONNECTOR
FOOT AMPTROL
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FIGURE E.1 BLOCK LOGIC DIAGRAM
LEAD #67A
PUSH PULL
DAUGHTER
CONTROL BOARD
FEEDHEAD
DIP SWITCHES
HEATER LIGHT
GAS
COLD
SOLENOID
INCH/
GAS
PURGE
POWER FEED® 25M
VOLTAGE
SENSE
LEAD #67
DRIVE
MOTOR
FEEDBACK
STATUS LED
GUN TIGGER AND
DUAL PROCEDURE
RECEPTACLE
2-STEP/
4-STEP
E-1
GEAR BOX
AND
CONDUCTOR
BLOCK
TACH