Tweco 251 Thermal Arc Fabricator - Manual (Page 36)

FABRICATOR 251
INSTALLATION 3-14 Manual No. 0-4847
3.16 Polarity Changeover
WARNING
ELECTRIC SHOCK CAN KILL! Make certain the input power is disconnected from the power supply before
proceeding. Do not reattach the input power until told to do so in these instructions.
The output terminals are located on the front panel of the welding power source.
CABLE TO GUN, CABLE TO WORK
CABLE TO GUN CABLE TO WORK
1. GMAW* – Steel, Stainless Steel,
Aluminum & gas shielded Flux
Cored electrode wires
1. D.C. Electrode Positive
(DCEP) – Reverse Polarity
1. Connected to (+)
Pos. output
terminal 1. Connected to (-)
Neg. output
terminal
2. FCAW* – Gasless Flux Cored
electrode wire 2. D.C. Electrode Negative
(DCEN) – Straight Polarity
2. Connected to (-)
Neg. output
terminal 2. Connected to (+)
Pos. output
terminal
CABLE CONNECTIONS
PROCESS POLARITY
* Exception - Contact your filler metal supplier for the recommended polarity.
Table 3-3: Process Cable Connections
Work Lead
Art # A-07163
Connected for D.C.
Electrode Positive
(DCEP) Welding
Figure 3-14: Polarity Connections for DCEP