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F-10
TROUBLESHOOTING AND REPAIR
F-10
LN-8 ELECTRICAL SEQUENCE OF OPERATION
FIGURE F.1 – LN-8 ELECTRICAL SEQUENCE OF OPERATION
LN-8
TURN ON POWER SOURCE
PRESS GUN TRIGGER
CLOSES 524-528
ENERGIZES 1 CR
CLOSES 531-7
OPENS 682-683
CLOSES 683-32A CIRCUIT
REVERSES WIRE
FEED MOTOR
FIELD
ENERGIZES
CONTROL CIRCUIT
(AND AUX. EQUIPMENT IF
CONNECTED TO 7-32A)
WIRE FEEDS DOWN
ARC STARTS
MOTOR ACCELERATES
TO WELDING SPEED
WELDING
INTERLOCKS 1 CR IF
INTERLOCK SWITCH
IS CLOSED
ENERGIZES 2 CR
(REED SWITCH)
CLOSES 2-4 CIRCUIT
ENERGIZES POWER
SOURCE PILOT RELAY
ENERGIZES
POWER SOURCE
CONTACTOR
ELECTRODE NOW
"HOT" TO GROUND