Nelson ArcCharger N550C DOMESTIC, Operation Manual

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Part No. 729-110-040 Rev. 1.41 | June 2016 © 2016 Nelson Stud Welding, Inc. All Rights Reserved.
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The Actual Weld Time is the time from the start of the main current to the time that the stud hits the
workpiece.
Under normal conditions, it will be equivalent to the Front Panel Time. This time measurement is
reported after the weld is complete.
For example:
Front Panel Time = 50 ms
Drop Time (F31) = 20 ms
Plunge short circuit on-time (F2) = 100 ms
The resulting Actual Weld Time is 50 ms. The main current would be on for the Front Panel Time + Plunge
short circuit on-time (F2) = 50 ms + 50 ms =100 ms, but the arc would exist only during the Actual Weld Time,
or 50 ms.
The important thing to note is that normally, the stud begins to drop at Front Panel Time Drop Time. But
if the Drop Time exceeds the Front Panel Time, the stud would need to begin to drop prior to the start
of the weld in order to make the Actual Weld Time to be the same as the Front Panel Time. This is
done by releasing the gun coil during the pilot arc stage.
For example:
Front Panel Time = 20 ms
Drop Time (F31) = 30 ms
Plunge short circuit on-time (F2) = 100 ms