Constant Voltage Controls - Lincoln Electric LN-8 SVM132-A Service Manual

B-3
CURRENT CONTROL. Adjusts welding current by
controlling power source output.
VOLTAGE CONTROL. Adjusts arc voltage by control-
ling wire feed speed.
TRIGGER INTERLOCK. With the switch in the OFF
position, the wire feed motor runs and the welding cir-
cuit is energized only when the gun trigger is pressed.
The operator must hold the trigger in from the start to
the finish of the weld. To stop the arc, the operator
releases the trigger and raises the gun from the work.
With the switch in the ON position, the operator holds
the trigger until the arc is established, then the trigger
can be released. When the welding is completed, the
operator raises the gun from the work to break the
arc.
WIRE FEED DIRECTION CONTROL. The direction
the electrode passes through the wire feeder is con-
trolled by this switch. The electrode is fed through the
wire feeder in the same direction that the switch is
pointing.
CIRCUIT BREAKER. Protects the circuit from severe
wire feed motor overloads and short circuits. Press to
reset.
GROUND LEAD PROTECTOR RESET BUTTON.
The ground lead protector guards the ground lead in
the control cable from damage that can occur when
the electrode circuit touches the wire feeder frame
while the gun trigger is pressed. This button resets the
ground lead protector circuit.

CONSTANT VOLTAGE CONTROLS

Operator controls for welding using a constant voltage
power source that differ from the constant current con-
trols are illustrated in Figure B.2. Refer to the figure
and the following explanations of the controls.
OPERATION
VOLTAGE CONTROL. Adjusts arc voltage by control-
ling power source output voltage.
CURRENT CONTROL. Adjusts wire feed speed to
control welding current.
FIGURE B.2 – CONSTANT VOLTAGE CONTROLS
LN-8
CURRENT
CONTROLS
VOLTAGE
CONTROLS
B-3