Lincoln Electric NA-3S, Service Manual, Page: 38 / 110

For further information on using these
power sources with NA-3, refer to the
DC-600, DC-1000, or DC-1500
operating manuals.
Idealarc DC-400
Consult the operating manual for this
power source.
SAF-600 and SA-800 with Dis-
continued Solid State Remote Field
Control
a. Set the “Voltage Range” switch
on the power source to “Low.”
b. Set the power source “Voltage”
rheostat to maximum.
c. Connect the cable from the power
source contactor box to the
power source Innershield stud.
d. Set the arc voltage using the
NA-3 “Voltage Control.” For initial
test welds, choose a setting from
Table B.3.
Approximate Voltage
Voltage Control Setting
18 - 22 1
28 - 32 3
38 - 42 6
SAM Motor-Generator or
Engine Welder
a. Set the power source “Constant
Voltage Control” to “High.”
b. Set the arc voltage using the
“Voltage Control” on the NA-3.
For initial test welds, choose a
setting from Table B.4.
Approximate Voltage
Voltage Control Setting
18 - 22 1
28 - 32 5
38 - 42 10
SAN with Discontinued Solid State
Remote Field Control
a. Set the power source “Voltage”
rheostat to maximum.
b. Set the arc voltage using the
“Voltage Control” on the NA-3.
For initial test welds, choose a
setting from Table B.5.
Approximate Voltage
Voltage Control Setting
18 - 22 1
28 - 32 5
38 - 42 10
3. Unless previously instructed, set the
“Inch Speed” for good arc striking. For
an inch speed slower than welding
feed speed, which is usually required
for good striking, set the “Inch Speed”
control on the inner panel one or two
dial numbers below the setting of the
“Current Control” on the front panel.
4. If using a motor-generator type power
source with the recommended
(discontinued) solid state remote
field control installed, the power
source OCV is controlled by the
“Open Circuit Voltage” control on the
inner panel of the NA-3. Set the
“OCV Control” to “4” and the “Inch
Control” to “2”. To read OCVs under
60 volts on the NA-3 voltmeter, inch
the electrode up from the work and
press the “Start” button before the
electrode reaches the work.
5. If installed, set the “Start Controls”
and “Crater Controls” on the inner
panel. For initial test welds, set both
“Time in Seconds” to “1” and both
“Current” and “Voltage” controls to the
same dial numbers (to produce about
the same output) as the “Current
Control” and “Voltage Control” on the
front panel.
OPERATING INSTRUCTIONS
B-9 B-9
NA-3 AND NA-4
TABLE B.3 – SAF-600 AND SA-800
VOLTAGE CONTROL SETTINGS.
TABLE B.4 – MOTOR-GENERATOR
VOLTAGE SETTINGS.
TABLE B.5 – SAN VOLTAGE
SETTINGS.