Lincoln Electric NA-3S, Service Manual, Page: 32 / 110

OPERATING INSTRUCTIONS
B-3 B-3
NA-3 AND NA-4
3 10
9
6
8
7
4
2
1
5A 5B
FIGURE B.1 – NA-3N CONTROLS.
CONTROLS AND
THEIR FUNCTIONS
NA-3N
The operator controls for the NA-3N are
illustrated in Figure B.1. Refer to the figure
and the following explanations of the
controls.
1. AMMETER. Indicates current only
while welding.
2. CIRCUIT BREAKER. Protects the
circuit from severe wire feed motor
overloads and short circuits. Press to
reset. Locate and correct the cause
of overloading.
3. CONTROL POWER. Turns input
control power “On” and “Off.” Also
used as an emergency “Off” in case
of malfunction.
4. CURRENT CONTROL. Adjusts wire
feed speed to control welding current.
5A. VOLTMETER (STANDARD). Indi-
cates voltage only while welding. Also
indicates OCV below 60 volts.
5B. ELECTRONIC VOLTMETER (OP-
TIONAL). Replaces the standard
voltmeter when precise monitoring of
the arc voltage is required. See the
section on this voltmeter for operating
information.
6. INCH UP AND INCH DOWN. Inches
the electrode at the speed set by the
“Inch Speed” control on the inner
panel.
7. START. Begins welding cycle.
8. STOP. Initiates the stopping cycle at
the end of the weld.
9. TRAVEL. Controls speed and
direction of travel. Turn to “Off” for no
travel, “Hand Travel” for travel without
welding, or “Automatic Welding” for
welding operations.
10. VOLTAGE CONTROLS. Adjusts arc
volts by controlling power source
output voltage.