Lincoln Electric IDEALARC SP-255, Operator'S Manual

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B-9
OPERATION
IDEALARC SP-255
the one that did not match (see Memory Number Key
Section).
4-STEP TRIGGER INTERLOCK KEYS
Pressing and
Controls whether 4-step trigger interlock is activated
or deactivated. (See “Using 4-Step Trigger Interlock
Function” section.)
NOTE: 4-Step Trigger is automatically deactivated if
either the spot or stitch timer mode is being used.
TYPICAL ACTIVATE KEY PRESS SEQUENCE
Auto screen is displayed prior to pressing keys.
Process key is pressed and held, then Toggle key is
pressed. The auto screen now displays the 4T symbol
in the upper left corner indicating that the 4-step trig-
ger interlock is now active.
TYPICAL DEACTIVE KEY PRESS SEQUENCE
Auto screen is displayed prior to pressing keys.
Process key is pressed and held, then Toggle key is
pressed. The 4T symbol is no longer displayed in the
upper left corner indicating that the 4-step trigger
interlock no longer functions.
USING 4-STEP TRIGGER INTERLOCK
FUNCTION
When the function is deactivated, the trigger will func-
tion in the normal mode which welds only when the
trigger is closed.
When activated, the trigger will function as follows:
Once the arc has been struck, the gun trigger may
be released and the welding will continue until
welding is stopped by either of two methods:
1. The arc is extinguished by manually jerking the
gun away from the work.
2. The gun trigger is depressed before the end of
the weld returning the trigger function to normal
mode so the weld will be stopped when the trig-
ger is released. Releasing the trigger reinstates
the trigger interlock function for the next weld.
The second trigger interlock stopping method per-
mits the user better control at the finish of the weld
and allows automatic burnback to prevent exces-
sive wire feed speed overrun.
The 4-step trigger feature does not function when
using SPOT or STITCH timed welding modes.
(See “Spot and Stitch Weld Modes” in this section.)