Lincoln Electric NA-3 Service Manual page 45

B-16
TABLE B.6 – TRAVEL SEQUENCE LEAD AND SWITCH POSITIONS.
Travel Starts Travel Stops
With "Start" With "Stop"
button button
With arc striking With arc stopping
With arc striking With "Stop"
button
With "Start" With end crater
button fill time
(a)
On machines below code 7432, connect to pin #8.
(b)
With crater fill board installed.
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
3. The arc continues to burn the
OPERATING INSTRUCTIONS
Older Models
Lead #691 to pin #6
Lead #692 to pin #5
Lead #691 to pin #6
Lead #692 to pin #7
Lead #691 to pin #5
Lead #692 to pin #7
Lead #691 to pin #8
b
Lead #692 to pin #9
Lead #694 to pin #10
"Contactor and Electrode Back Up
Time Delay" starts.
electrode back from the puddle until
the time set on the "Contactor and
NA-3 AND NA-4
Newer Models*
a
1 2 3
Switch #1
a
1 2 3
Switch #1
1 2 3
Switch #1
1 2 3
Switch #1
*NOTE:
Indicates switch in up position
Indicates switch position does not matter
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.
B-16
4 1 2 3 4
Switch #2
4 1 2 3 4
Switch #2
4 1 2 3 4
Switch #2
4 1 2 3 4
Switch #2
Indicates switch in down
position
JUNE 97