OPERATING INSTRUCTIONS |
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Wire Feed Motor Acceleration
WARNING
ELECTRIC SHOCK can kill.
•Turn off input power to the welding power source using the disconnect switch before working on this equipment.
The
FIGURE B.2 – ACCELERATION
JUMPER PLUGS.
JUMPER
PLUG
Burnback and Electrode Backup
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.
NA-5
The standard stopping sequence when the optional “Crater Controls” are not used is as follows:
1.Press the “Stop” button.
2.The wire feed motor stops and the “Burnback Time Delay” starts.
3.The arc continues to burn the electrode back from the puddle until the arc goes out or the time set on the thumbwheel switch elapses. This control should be set for just enough burnback time to prevent crater sticking.
There are two other ways this circuit can be connected. One will cause the wire to retract* with a contactor drop out delay at the end of the weld. The second will cause the wire to retract* during burnback time, and there will be no contactor drop out delay at the end of the weld. If either one of these alternate methods of stopping the weld is desired, the connections on the logic board can be easily changed.
To change the stopping 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 switch positions (newer models) on the logic board as shown in Table B.2.
Optional “Crater Controls”
This option is recommended for applications where the ending bead size must be controlled, applications when the crater must be filled, roundabouts, and any other welds where the end overlaps the start.
When the “Stop” button is pressed, the machine welds at the wire speed and voltage set by the “Crater Controls” until the time set on the thumbwheel switch elapses. The circuit then automatically switches to the arc stopping sequence described above.
NOTE: Setting crater time to 0.00 seconds will give zero crater time; however, the crater settings will be active during burnback time until the arc goes out.
*Wire will retract at weld mode speed (or crater mode speed, if installed) until the arc goes out and then retract at strike mode speed for the remainder of burnback time.
