Panasonic YD-500KR Operating Instructions Manual page 48

GLOSARY
 What is Simple Unification Adjustment?
Selection of the welding current with the output regulator on the remote controller.
"Simple unification" adjustment refers to adjustment which automatically selects the welding
voltage almost commensurate with that welding current.
 What is Wire Slowdown Speed?
In order to obtain a secure arc start. a wire feed rate at welding start time is set slower
than an original wire feed rate complying with the set welding condition.
This slow speed at welding start time is called a wire slowdown speed
.
 What is Burn-back Time ?
Even if the torch switch is turned off in order to finish welding, the wire does not stop
immediately because of inertia of the feed motor and feed route internal play; the wire tends
to project from the tip of the welding torch. This causes the wire to get stuck to a weld assembly
or worsens an arc start for next welding, thus leading to an inconvenience.
To eliminate this inconvenience, an output voltage is generated for a very short time to burn
up surplus wire, even after the torch switch is turned off. This processing time is called
a burn-back time; its time width differs depending on the set welding conditions, length of
the extension cable, feed resistance of the wire feed route, and so on. For example, when
the extension cable is made longer, adjust the burn-back time to the "Longer" side(turn right).
 What is FTT Control?
Control to suppress growth of a hall produced at the tip of the wire upon completion of welding.
Select FTT "on" when you want to improve the end shape of the head (when making the crater
smaller) and sharpness of arc upon completion of welding.
When the extension cable is used, however, select FTT"OFF"
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