Process/Contactor Switch, Engine Auto Speed, And Arc Control - Miller Trailblazer 325 Diesel Owner's Manual

6-3. Process/Contactor Switch, Engine Auto Speed, And Arc Control

1 Process/Contactor Switch
!
Weld output terminals are energized
when Process/Contactor switch is
in an Output On position and the en-
gine is running.
Use switch to select weld process and weld
output on/off control (see Table 6-1 and
Section 5-9).
Place switch in Remote positions to turn
weld output on and off with a device con-
nected to the remote receptacle.
Place switch in Output On positions for
weld output to be on whenever the engine
is running.
2 Arc Control
Arc control is active for all Stick and Solid
Wire applications.
For both Stick and Solid Wire applications,
a good starting point is to set this control at
the «.
For Stick applications, the Arc control var-
OM-258900 Page 32
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Complete Parts List available at www.MillerWelds.com
SOFT
1
ies additional amperage during short arc
length conditions.
For Solid Wire applications, the Arc control
varies inductance providing weld fluidity.
In setting shown above, output is available
when the engine is running. Stick process
is chosen using a XX18−type electrode. Arc
Control is set for Soft and the value is
shown on the meters.
Engine Auto Speed
When Engine Control switch is in Auto
Speed position, the engine speed varies
depending on the welding load and Pro-
cess/Contactor switch position.
For Gouge, the engine runs at 3600 rpm
and will return to idle about 9 seconds after
the arc is broken.
For Stick, based on preset, unit goes to the
next highest speed upon arc initiation and
transitions down one speed if power is ap-
propriate for load.
18
2
259 872 / 248 009-A
For TIG, based on preset, unit goes to
speed appropriate for load at arc initiation.
Approximate Amperage/RPM Steps:
0 − 150 A = 2400 RPM
151 − 210 A = 2800 RPM
211 − 260 A = 3200 RPM
261 − 325 A = 3600 RPM
Engine returns to idle about 3 seconds after
the arc is broken if running at less than
2800RPM. If running at more than 3200
RPM, return to idle time is about 9 seconds.
For Solid Wire, unit goes to 3200 rpm upon
arc initiation and transitions down to appro-
priate speed for load.
Amperage/RPM Steps and return to idle are
the same as Stick/TIG.
For Flux-Core Wire, unit goes to 3600 rpm
upon arc initiation and transitions down to
appropriate speed for load.
Amperage/RPM Steps and return to idle are
the same as Stick/TIG.
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Miller recommends Hobart filler metals.