Mig Welding Connections; Process/Polarity Table - Miller Millermatic 255 Owner's Manual

5-8. MIG Welding Connections

3
4
!
Turn off unit and disconnect input
power before making connections.
1 Positive Weld Output Receptacle
2 Negative Weld Output Receptacle
3 Wire Drive Assembly Cable
4 Work Clamp And Cable
Ensure all connections are tight.

5-9. Process/Polarity Table

Process
GMAW − Solid wire with shielding gas
FCAW-S − Self-shielding wire − no
shielding gas
FCAW-G − Flux-cored wire with shield-
ing gas
.
A complete Parts List is available at www.MillerWelds.com
1
2
MIG/FCAW-G − DCEP
(Direct Current Electrode Positive)
5
7
6
5 Gun End
Connect gun end to drive assembly (see
Section 5-10).
6 Trigger Control Cable
7 Four Pin Trigger Control Cable
Receptacle
Route trigger control cable through MIG
gun hole.
Polarity
DCEP − Reverse polarity
DCEN − Straight Polarity
DCEP − Reverse Polarity
3
4
FCAW-S − DCEN
(Direct Current Electrode Negative)
Connect plug on end of cable to four pin
receptacle inside unit.
8 MIG Shielding Gas Connection
Connect supplied gas hose between regu-
lator/flowmeter gas hose connection and
fitting on rear of welding power source.
See Section 11-16 for gas selection.
Cable Connections
Wire Drive Assembly Cable
Connect to positive (+)
output receptacle
Connect to negative (−)
output receptacle
Connect to positive (+)
output receptacle
1
2
8
280401B / Ref. 275167A / 282987A
Work Cable
Connect to negative (−)
output receptacle
Connect to positive (+)
output receptacle
Connect to negative (−)
output receptacle
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