TRIGGER AND SHUTDOWN
CIRCUIT
When the gun trigger switch is activated (closed), the
trigger board completes the trigger signal path. This
energizes the CR1 relay located on the power board.
The CR1 relay activates the wire drive motor and the
#2 and #4 circuit, which then activates the Lincoln
welding power source. The CR1 relay is also used to
energize the gas solenoid.
The normally closed relay located on the voltage
board is in series with the trigger signal. If an out-of-
voltage-range signal or a ground fault condition
should occur, the CR501 (on voltage board) relay con-
tacts would "open," and the trigger signal path would
be interrupted. This would cause the wire feeder to
"shut down" until the gun trigger is released or the
ground fault protector is reset.
THEORY OF OPERATION
E-3 E-3
LN-9 GMA Wire Feeder
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
FIGURE E.3 – TRIGGER AND SHUTDOWN CIRCUIT
