Lincoln Electric NA-3S, Service Manual, Page: 45 / 110

OPERATING INSTRUCTIONS
B-16 B-16
NA-3 AND NA-4
Travel Starts Travel Stops Older Models Newer Models*
With “Start” With “Stop” Lead #691 to pin #6
a
button button Lead #692 to pin #5
With arc striking With arc stopping Lead #691 to pin #6
a
Lead #692 to pin #7
With arc striking With “Stop” Lead #691 to pin #5
button Lead #692 to pin #7
With “Start” With end crater Lead #691 to pin #8
button fill time
b
Lead #692 to pin #9
Lead #694 to pin #10
2 2 3 3 4 4 1 1
Switch #1 Switch #2
2 2 3 3 4 4 1 1
Switch #1 Switch #2
2 2 3 3 4 4 1 1
Switch #1 Switch #2
2 2 3 3 4 4 1 1
Switch #1 Switch #2
(a)
On machines below code 7432, connect to pin #8.
(b)
With crater fill board installed.
*NOTE:
Indicates switch in up position Indicates switch in down
position
Indicates switch position does not matter
TABLE B.6 – TRAVEL SEQUENCE LEAD AND SWITCH POSITIONS.
Setting the Arc Stopping Sequence
The primary consideration in setting the arc
stopping sequence is to prevent the
electrode from sticking in the puddle. This is
easily done with the machine as shipped.
The standard stopping sequence is as
follows:
1. Press the “Stop” button.
2. The wire feed motor stops and the
“Contactor and Electrode Back Up
Time Delay” starts.
3. The arc continues to burn the
electrode back from the puddle until
the time set on the “Contactor and
Electrode Back Up Feed Delay”
elapses. This control should be set
for a minimum burnback time that still
prevents crater sticking.
When it is necessary to retract the electrode
for easy fixture unloading or to assure
restriking with Linc-Fill long stickout
procedures, the standard machines can be
reconnected so that, when the “Stop” button
is pressed, the wire feed motor reverses to
inch the electrode away from the crater. This
can be done with or without burnback. The
distance the electrode retracts depends
primarily on the time set on the “Contact and
Electrode Back Up Time Delay.” The “Inch
Speed” set for good arc striking also affects
the distance the wire is retracted.
JUNE 97