Process/Contactor Switch - Miller Trailblazer 302 Diesel Owner's Manual

6-3. Process/Contactor Switch

1 Process/Contactor Switch
Y Weld output terminals are energized
when Process/Contactor switch is
in an Electrode Hot position and the
engine is running.
.
The unit will not return to idle speed
when Process/Contactor switch is in a
Wire position and the remote contactor
is on (closure between pins A and B on
remote receptacle).
Use switch to select weld process and weld
output on/off control (see table below 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 Electrode Hot positions for
weld output to be on whenever the engine
is running.
Wire Positions:
Use Wire positions for MIG welding using a
voltage sensing wire feeder (Electrode Hot)
Switch Setting
Electrode Hot − Wire
Electrode Hot − Stick
Electrode Hot − Stick
Electrode Hot − Lift Arc/
Scratch Start TIG
Remote − TIG
Remote − Stick
Remote − Wire
1
or wire feeder using remote control.
Stick Positions:
Use Stick positions for stick (SMAW) and
air carbon arc (CAC-A) cutting and
gouging.
When switch is in a Stick mode, select one
of four dig settings to provide additional am-
perage during short arc length conditions
and help prevent electrodes from "sticking".
See Stick position descriptions following
(reading L to R):
Soft Arc (E 7018) (Position 1) - This setting
provides a low dig/arc force setting for
smooth weld performance. A stable weld
puddle with little arc "snap" gives excellent
weld bead appearance with minimal
spatter.
Medium Soft Arc (Position 2) - This setting
provides a low to medium dig/arc force that
gives a slightly more fluid weld puddle,
more arc "snap", and reduces the potential
for electrode sticking at shorter arc lengths.
Medium Stiff Arc (Position 3) - This setting
provides medium dig/arc force for open root
Process/Contactor Switch Settings
Process
MIG (GMAW)
Stick (SMAW)
Select Preferred Dig
Air Carbon Arc (CAC-A) Cutting And Gouging
Select Any Dig
Lift Arc/Scratch Start TIG (GTAW)
GTAW With HF Unit, Pulsing Device, Or
Remote Control
Stick (SMAW) With Remote On/Off
MIG (GMAW)
Ref. 804 195-A / Ref 216 171-A
vertical up joints or joints that do not require
additional current for fit up inconsistencies.
Stiff Arc (E6010) (Position 4) - This setting
provides a high dig/arc force for open root
vertical down joints where additional
current is needed to compensate for tight
joint fit up without the need to increase
overall welding current. This setting is rec-
ommended for those who prefer a very stiff
arc with 6010 electrodes.
TIG Positions:
TIG − Remote On/Off − Use this position for
TIG welding using remote on/off control.
Electrode Hot − Lift-Arc™/Scratch Start TIG
(Provides great DC starts with either start-
ing method) - With switch in this position,
normal open-circuit voltage is not present
between the electrode and workpiece. A
solid-state contactor energizes after the
electrode touches the workpiece,
preventing overheating, sticking, or con-
tamination of the electrode (see Sections
6-4 and 6-5).
Output On/Off Control
Electrode Hot
Electrode Hot
Electrode Hot
Electrode Hot
At Remote Receptacle
At Remote Receptacle
At Remote Receptacle
OM-217 454 Page 21