Connecting A Spoolmatic 15A Or 30A Gun; Setting Gun Polarity For Wire Type - Miller Millermatic 251 Owner's Manual

4-7. Connecting A Spoolmatic
The Spoolmatic 15A or 30A welding gun connects directly to the 10-pin receptacle on the front of the welding power
source − no adapter required. NOTE: Two welding guns may be connected to the welding power source at the same
time, but only one welding gun may be in use at any one time. If the triggers of both welding guns are pulled at the same
time, the weld output and wirefeed motor are disabled.

4-8. Setting Gun Polarity For Wire Type

Wire Drive
Assembly Lead
+
Shown as shipped − Electrode Positive (DCEP): For
solid steel, stainless steel, aluminum, or flux core with
gas wires (GMAW).
Electrode Negative (DCEN): Reverse lead connections
at terminals from that shown above for gasless flux core
wires (FCAW). Drive assembly becomes negative.
OM-1326 Page 12
R
15A Or 30A Gun
Changing Polarity
Work Clamp Lead
D
-
Positive Terminal Negative Terminal
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1 Polarity Changeover Label
Information
Always read and follow manufacture's
recommended polarity.
1
D
3/4, 11/16 in
Ref. 190 821-A