Lincoln Electric NA-3S, Service Manual, Page: 41 / 110

OPERATING INSTRUCTIONS
B-12 B-12
NA-3 AND NA-4
c. If control of the initial bead size
or penetration requires use of the
optional start control PC board.
See Starting and Stopping
Sequences later in this chapter for
descriptions of the various starting
sequences and the rewiring needed
to accomplish them.
5. Depending on the procedures and
application:
a. Select the arc and travel stopping
sequence.
b. Decide if control of the ending
bead size or crater filling requires
the use of the optional crater
controls PC board.
See Setting Travel Starting and
Stopping section later in this chapter
for descriptions of the various starting
sequences and the rewiring needed
to accomplish them.
CONTROL ADJUSTMENTS
AND TEST WELDING
1. Set the power source and wire feeder
current and voltage controls for the
outputs specified using the following
procedures as they apply:
SAF-600 and SA-800 with Discontinued
Solid State Remote Field Control
a. Set the “Voltage Range” switch
on the power source to “High.”
b. Set the power source “Voltage”
rheostat to maximum.
c. Set the arc voltage with the
“Voltage Control” on the NA-3.
For the initial test welds, set the
control at “6”.
d. Connect the cable from the power
source contactor box to the
power source sub-arc stud with
the lowest current range that still
permits welding at the current
specified in the procedures. For
example, if you want 500 Amps
welding current, use the
“300-575” stud and not the
“450-Max” stud.
e. Make final current adjustments
with the NA-3 “Current Control.”
This control varies the current
over the entire range controlled
by the stud connection. For initial
test welds, set the control at “6”.
SA-750 (Discontinued)
Follow the instructions for the
SA-800, except the SA-750 does not
have a “Voltage Range” switch or a
power source contactor box. For
power sources without a contactor
box, connect the electrode cable from
the NA-3 input cable assembly to the
appropriate stud.
Idealarc DC-600, DC-1000, and
DC-1500
a. Set the toggle switch on the front
of the DC-600, DC-1000 or DC-
1500 to “Output Control Remote.”
b. Set the “Electrode Negative -
Electrode Positive” switch to
correspond to the polarity of the
electrode cable connection.
c. Set the 3-position toggle switch to
“VV Submerged Arc.”
d. Set the NA-3 “Inch Speed” at “2”.
e. Set the “OCV Control” near
minimum.
NOTE: Most submerged arc welding
can be done with the DC-600,
DC-1000, and DC-1500 power
sources set for “CV Submerged Arc”
and the NA-3S set for constant
voltage “CV” wire feed. Constant
current would normally only be
required for high current, large puddle
type applications. Refer to the
DC-600, DC-1000, or DC-1500
operating manuals for further
information.