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TRIGGER CIRCUIT
The 24 VAC output of the trigger transformer
is sent to the control PC board and rectified
by a diode network. When the gun trigger is
pulled, a circuit is closed which energizes the
control relay. The three sets of contacts in
the relay close and energize the multiple
functions of the wire feeder. See Figure E.2.
THEORY OF OPERATION E-3
LN-7 GMA WIRE FEEDER
FIGURE E.2 – TRIGGER CIRCUIT.
TRIGGER
TRANS-
FORMER
24 VAC
8.8 VAC
115 VAC
115 VAC
CIRCUIT
BREAKER
OPTIONAL
METER KIT
OPTIONAL
TIMER OR
BURNBACK KIT
GROUND
LEAD
PROTECTOR
WIRE
SPEED
CONTROL
CR1
CONTROL
RELAY
CONTROL
BOARD
WIRE DRIVE
MOTOR
5-95 VDC
GUN
TRIGGER
SCR
POWER
CIRCUIT
FROM
WELDING
POWER
SUPPLY
DIODE
RECTIFIER
NETWORK
115 VAC
GAS
SOLENOID
TO WELDING
CONTACTOR
CURRENT
LIMITING
CIRCUIT
24 VDC
NOTE: Unshaded areas of block logic diagrams are the subject of discussion.