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B-11
The new foot pedal provides such independent action
distinction of precisely where the arc start switch actu-
ates without over-riding minimum control pedal posi-
tion, and precisely where the control pedal has been
returned to minimum position without inadvertently de-
actuating the arc start switch. The result is repeatable
consistency in TIG weld starting and crater-fill for man-
ual process control.
Using this new foot pedal with the Precision TIG's new
presettable Minimum Output level, in addition to the
presettable Maximum Output level, further enhances
the starting and crater level consistency as well as the
control resolution of the manually controlled foot pedal.
FIGURE B.6
OPERATION
Setup for TIG Amptrol Welding
Min. to Max.
Amptrol
4-6 pps is a typical initial setting.
Set for bead shape and travel speed:
Higher for thinner plate and faster travel.
Lower for thicker plate and slower travel.
40-60% is a typical initial setting.
Set for total heat of Peak current:
Lower reduces distortion and burn-thru.
40-60% is a typical initial setting.
Set as low as will maintain a pulse arc
(Will not drop below Min.Output setting.)
PRECISION TIG 375
FIGURE B.5
Adjustable
or
Removable
Heel Stop
Fully Pressed
Control Pedal
At-Rest
Control Pedal
Off
Pressed
Switch Pedal
AC Balance
AUTO
or
Set:
More +
for alum.oxide "Cleaning"
w/o "Spitting" or "wetting" loss.
Balanced for equal + and - current.
More -
for higher "Penetration".
Max. to Min.
Amptrol
Pulse Frequency
% On Time
Background Current
Foot
Toe
Rock
Pressure
Control
Switch
Maximum Output
Machine Setting
Minimum Output
Machine Setting
Time
At-Rest
Switch Pedal
Standard Controls
Power Switch
ON
Mode Switch
TIG
Polarity Switch
or
-
AC
DC
Local/Remote
Switch
REMOTE
Maximum Output
Set to desired max.
Amptrol output level.
Minimum Output
Press Display switch
and Set to desired min.
Amptrol (Start/Crater)
output level.
Postflow
Set as low as required.
Higher for larger
tungsten and current.
Advanced Panel
Controls
(If used)
Trigger Switch
2-STEP
Pulse Switch
or
ON
OFF
Downslope
ZERO
For no arc-out delay.
B-11
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Troubleshooting
