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B-7
OPERATION
B-7
INTERNAL SET UP CONTROLS
Precision TIG 275 models which have an Advanced
Panel (K1829-1) option installed* have the following
additional control features which are set up using the
DIP Switch (S1) provided on the internal panel of this
option.
Access to this internal panel is obtained by removing
the two screws securing the top corners of the
Precision TIG front control panel and swinging the con-
trol panel down to reveal the panel mounted on the sur-
face of the Precision TIG Control board:
• THE CONTROL BOARDS CONTAIN STATIC SEN-
SITIVE COMPONENTS
• To avoid possible damage to these components
be sure to ground yourself by touching the
machine’s sheet metal while handling or making
settings on the internal control box components.
------------------------------------------------------------------------
PRECISION TIG ADVANCED PANEL
(Internal Panel)
DIP SWITCH POSITIONS (FACTORY SETTINGS)
STICK WELDING FEATURES
The following DIP switch feature selections function
only when the Precision TIG is set to Stick mode. (See
Item 3):
• Switch #6 Hot Start Level – Provides an extra out-
put "boost" pulse at the arc strike to enhance arc
starting. This is factory set for a level (about 50%
extra) which is usually good for most stick welding
applications
ON – Hot Start level is used (as shipped).
OFF – No Hot Start.
• Switch #7 Arc Force Level – Prevents "stubbing"
of the electrode by providing extra output current if
the arc voltage drops below the level required to
sustain the welding arc. High (+65%) and Low
(+12%) factory set levels are selectable which are
good for most stick welding applications.
ON – Higher for a "crisper" arc, often desired for 6010
type electrodes.
OFF – Lower Arc Force (as shipped) for a "softer" arc
with 7018 or general type electrodes.
• Switch #8 (NOT CURRENTLY FUNCTIONAL)
TIG WELDING FEATURES
The following DIP switch feature selections function
only when the Precision TIG is set to TIG mode (See
Item 3):
• Switch #1 Preflow/Postflow Time Extension*
(See Item 9)
ON – Doubles the time ranges.
OFF – Standard time ranges (as shipped).
• Switch #2 2-Step Trigger Restart Feature (See
Figure B.3)
ON – Restart Enabled (as shipped).
OFF – Restart Disabled.
• Switch #3 4-Step Trigger Restart Feature (See
Figure B.4)
ON – Restart Enabled.
OFF – Restart Disabled (as shipped)
• Switch #4 (NOT CURRENTLY FUNCTIONAL)
• Switch #5 Crater-Fill Level (See Item 7)
ON - Level is minimum rating of the machine (2A)
OFF – Level (as shipped) is Minimum Output setting
(same as Start level).
*
The Preflow/Postflow Time doubling feature can also be selected
on Precision TIG 275 models without the Advanced Panel by
accessing the Control board in the control box per above instruc-
tions, then disconnecting the jumper terminals attached to the
jumper plug connected to receptacle J3 of the Control board.
(Refer to Machine Wiring Diagram.)
PRECISION TIG 275
CAUTION
HOT START
ARC FORCE
^ ON
1 2 3 4 5 6 7
DIP SWITCH (S1)
S F
ON
OFF
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