Setting Travel Starting And Stopping; Stopping Sequences; Starting Sequences; Reconfiguring The Travel Sequences - Lincoln Electric NA-5N Service Manual

B-6
The starting sequence is as described above
except that when the arc strikes, the
machine welds at the wire speed and
voltage set by the "Start Controls" panel until
the time set on the thumbwheel switch
elapses. The circuit then automatically
switches to the "Welding Controls" wire
speed and voltage. Actual settings depend
on application requirements.
Available options for applications with
particularly difficult starting.
1. K238 High Frequency Generator -
See IM305 Sec. T2.5.8.
SETTING TRAVEL
STARTING AND STOPPING
Standard machines can be connected for a
variety of starting and stopping sequences.

STARTING SEQUENCES

"On-the-Fly" Travel Starting
When shipped, all models are connected for
"On-the-Fly" travel starting. The starting
sequence is as follows:
1. With the electrode NOT touching the
work, press the "Start" button. This
starts both the wire feed and travel
motors.
2. When the electrically "hot" electrode
touches the work to start the arc,
there is relative motion between the
end of the electrode and the work.
This "scratching" type contact helps
assure consistent arc striking.
This sequence is recommended for most
welding applications including:
1. Roundabouts and any other weld
which ends at its starting point. A
K337 Weld Timer Module to control
the welding cycle duration can be
installed.
2. Welds started on a run-out tab.
OPERATING INSTRUCTIONS
NA-5
3. Any application for improved arc
striking.
"Standstill" Travel Starting
All models can be reconnected so the travel
remains at a standstill until the arc starts.
"Standstill" travel starting is used when the
electrode must be started at a precise
location.
For consistent arc striking with "Standstill"
travel starting, always clip the end of the
electrode to a sharp point before starting.

STOPPING SEQUENCES

As shipped, the travel stops when the "Stop"
button is pressed, producing a small crater
area.
When the end of the weld overlaps the
beginning, changing the stopping sequence
to stop the travel later spreads the crater
over a longer area.
RECONFIGURING THE TRAVEL
SEQUENCES
WARNING
ELECTRIC SHOCK
can kill.
• Turn off input power to
the welding power source
using the disconnect
switch before working on
this equipment.
To change the travel sequence, turn off all
input power to the NA-5 control box. Open
the control box. The logic board is mounted
on the back of the box in the upper right
hand corner. To change the travel circuit for
the various modes of starting and stopping,
follow the information in the wiring diagram
for the NA-5 being used. Table B.1 also
shows information on reconfiguring the
travel sequences.
B-6