Lincoln Electric NA-3S, Руководство по обслуживанию

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OPERATING INSTRUCTIONS
B-15 B-15
NA-3 AND NA-4
“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 that
ends at its starting point. A timer can
also be installed to control the
welding cycle.
2. Welds started on a run-out tab.
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.
Setting Stopping Sequences
As shipped, travel stops when the “Stop”
button is pressed, which produces 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.
Changing the Travel Sequence
To change the travel sequence, turn the
input AC power off at the power source,
remove the screw holding the inner panel,
and swing the panel open. Change the
connections (older models) or the switch
positions (newer models) on the logic board
as shown in Figure B.8 and Table B.6.
OLDER LOGIC BOARD NEWER LOGIC BOARD
693
692
691
694
P5
P10
P8 P6
P3 P2
P1
P4 P9
P7
690
FIGURE B.8 – LOGIC BOARD TRAVEL SEQUENCE CONNECTIONS
OR SWITCH POSITIONS.