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LF-72/74 SINGLE/DUAL
Section E-1 Section E-1
Theory of Operation...............................................................................................Section E
General Description ......................................................................................................E-2
Input Receptacle, Control Board and Operator Controls.............................................E-2
Drive Motor, Tach Feedback and Gas Solenoid...........................................................E-3
TABLE OF CONTENTS
- THEORY OF OPERATION SECTION -
14 PIN
INPUT CABLE
RECEPTACLE
24/42 VAC
CONTROL BOARD
WIRE FEED
SPEED POT.
TRIGGER
INTERLOCK
2-STEP
COLD FEED
GAS PURGE
OPTIONAL
BURNBACK
TIMER
OPTIONAL
REMOTE
VOLTAGE
CONTROL
GAS
SOLENOID
3.75 AMP
OVERLOAD
PROTECTION
WIRE DRIVE
RECEPTACLE
WIRE
DRIVE
MOTOR
TACK
To Gun Trigger
FIGURE E.1 – LF-72/74 BLOCK LOGIC DIAGRAM