Miller Electric OM-234 016D - Manual (Page 26)

OM-234 016 Page 17
SECTION 4 − OPERATION
4-1. Controls For Millermatic 140/180 Models
A. Spool Gun Operation On Millermatic 140/180 Models
sb5.1* 6/92 − S-0621-C / Ref. 802 982-A / 804 986-A
.
Spool Gun/MIG Gun switch on
Millermatic 140/180 must be in
Spool Gun position for spool
gun to operate.
1 Shielding Gas Cylinder
For shielding gas connections, see
welding power source Owner’s
Manual.
2
Valve
Open valve on cylinder just before
welding.
Close valve on cylinder when
finished welding.
3
Spool Gun/MIG Gun Switch
Switch must be set in Spool Gun
position for spool gun to operate.
4
Trigger
Press trigger to energize welding
power source contactor, start
shielding gas flow, and begin wire
feed.
5
Wire Feed Speed Control
Wire feed speed is controlled by
welding power source Wire Speed
control (see welding power source
Owner’s Manual or door chart for
appropriate setting).
6
Voltage Control
Arc voltage is controlled by welding
power source Voltage control (see
welding power source Owner’s
Manual or door chart for
appropriate setting).
.
To purge shielding gas line, set
gun selection switch (item 3) to
the MIG Gun position. Press
spool gun trigger to energize
gas valve. Shielding gas will
flow, but spool gun will not feed
wire. Hold trigger in for several
seconds to purge gas line.
Return gun selection switch to
the Spool Gun position before
welding.
1
2
3
4
5
6