Process/Contactor Switch; Engine Auto Speed - Miller Trailblazer 325 Diesel Owner's Manual

6-3.

Process/Contactor Switch

Process/Contactor Switch Setting
Output On – GMAW/FCAW (MIG)
Output On – FCAW-S (Electrode
Negative)
Output On - SMAW (STICK XX18 and
STICK XX10)
Output On – GTAW (Lift-Arc TIG)
Output On – CAC-A (Air Carbon Arc
Gouging)
Remote ON/OFF Required - GTAW (Re-
mote TIG)
Remote ON/OFF Required - SMAW (Re-
mote Stick)
Remote ON/OFF Required - GMAW/
FCAW (Remote MIG)
6-4.

Engine Auto Speed

Engine Auto Speed
When Engine Control switch is in Auto
Speed position, the engine speed varies de-
pending on the welding load and Process/
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.
For TIG, based on preset, unit goes to
speed appropriate for load at arc initiation.
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Complete Parts List is available at www.MillerWelds.com
Typical Process Applications (DC Only)
MIG solid wire and dual shield flux core use a voltage sensing (VS) feeder that does
not require a control cable back to the welder/generator.
FCAW (Flux Cored Arc Welding - self shielded) uses a voltage sensing (VS) feeder
that does not require a control cable back to the welder/generator.
Stick welding with or without a remote amperage control. Strike an arc to start welding.
Lift-Arc TIG: touch tungsten to work and lift to start welding. Uses circuitry internal to
the welder/generator to aid arc start. Can be used with or without a remote control. Au-
to Crater option can be enabled/disabled using the Service Menu.
Gouging with or without a remote amperage control. Strike an arc to start gouging.
High Frequency TIG or Scratch Start TIG welding. High frequency TIG starting with re-
mote control allows remote On/Off and Amperage control. Another typical application
is a simple TIG rig with a remote control device.
Stick welding with RHC-14 control allows remote On/Off and Amperage control. This
can help eliminate accidental arc strikes.
MIG solid wire and dual shield flux core using a constant speed feeder. Use feeders
with 14-pin remote voltage control, or use a Spoolmatic 30A with WC24 control.
Approximate Amperage/RPM Steps:
0 to 135 amps: 1800 RPM
136 to 180 amps: 2400 RPM
181 to 210 amps: 2800 RPM
211 to 235 amps: 3200 RPM
235 amps and above: 3600 RPM
TIG (Lift-Arc): 1800 RPM idle
TIG (Scratch Start): 1800 RPM idle
Stick (EXX18): 1800 RPM idle
Other processes: 2400 RPM idle
Engine returns to idle about 3 seconds after
the arc is broken if running at less than 2800
RPM. If running at more than 3200 RPM, re-
turn to idle time is about 9 seconds.
1 Process/Contactor Switch
Weld output terminals are energized
when Process/Contactor switch is in
1
an Electrode Hot position and the en-
gine is running.
Use switch to select weld process and weld
output on/off control (see table below).
Place switch in Remote On/Off Switch Re-
quired positions to turn weld output on and off
with a device connected to the Remote
receptacle.
Place switch in Output On positions for weld
output to be on whenever the engine is
running.
Use the Lift-Arc TIG mode for TIG (GTAW)
welding using the Lift-Arc TIG starting
procedure.
1
For Solid Wire, unit goes to 3200 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.
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
metals.
Hobart filler
OM-279836 Page 31