Table of Contents
Advertisement
B-3
DC TIG Starter Control Function/Operation
Postflow Time: An infinite range of postflow times
between 5 and 55 seconds can be set by adjusting
this knob on the front panel.
Downslope: Current downslope "fade-out" can be reg-
ulated from fast (0 seconds) to slow (30 seconds) by
adjusting this knob on the front panel. The current
downslope starts at the level set by the current limit
"CL" knob and reduces to a crater fill level of 25% of
CL. This switch should be placed in the fast (downs-
lope off) position when the DC TIG Starter is used
with an amptrol.
Remote Current Limit: This feature limits the maxi-
mum current obtainable when the DC TIG Starter is
used with a remote amptrol or sets the welding current
when the DC TIG Starter is used with an arc start
switch. Current limit can be controlled by adjusting this
knob on the front panel.
OPERATION
DC TIG Starter Front Panel
Trigger Function Switch: This switch selects a 2-step
or 4-step trigger function when used with an arc start
switch. This switch should be placed in the 2-step
position when the DC TIG Starter is used with an
amptrol. For best utility, the output terminals switch on
the Invertec should be placed in the "REMOTE" posi-
tion.
Operation with an Arc Start Switch
2-STEP: In this mode, closing the trigger (or arc start
switch) will start the welding process with a 0.5 sec-
ond gas preflow. The Invertec's welding terminals will
energize and the solid state starting circuit is enabled.
The starting circuit will continue operation until the arc
has been established or 2 minutes elapse. Once the
welding arc is established, an optimized upslope takes
the welding current up to the desired current limit and
the arc will be maintained as long as the trigger is
closed. Releasing the trigger initiates the
downslope/crater fill sequence and then starts the
postflow timing. Reclosing the trigger during the
downslope/crater fill sequence begins the upslope
sequence starting at the current level reached in the
downslope sequence. Reclosing the trigger during
postflow skips the preflow stage and immediately
restrikes the arc. If the arc is lost during welding, the
starting circuit will resume operation for up to two min-
utes to re-establish the arc. If the arc is not re-estab-
lished, the DC TIG Starter kit will shut off the starting
circuit, shut off the Invertec's trigger, begin postflow
timing, and await the release of the arc start switch.
See FIGURE 3.
INVERTEC DC TIG STARTER
B-3
Advertisement
Table of Contents
