Tweco 281 Thermal Arc Fabricator - Manual (Page 38)

FABRICATOR 281
3-16 April 10, 2006
Art # A-07480
Cable from wirefeeder
connected to
-
terminal
Cable to work
Connected for D.C.
Electrode Negative
(DCEN) Welding
Figure 3-16: Polarity Connections for DCEN
Changing polarity process.
a. Locate the two terminal knobs at the front of the machine. Refer to Figures 3-15 and 3-16.
b. Remove both terminal knobs by rotating counterclockwise.
c. Set up the desired lead polarity as per Table 3-3 and as shown in Figures 3-15 or 3-16.
d. Place the Work Lead cable on the opposite terminal.
e. Replace both terminal knobs and tightly secure them to ensure good electrical connections.
CAUTION
Ensure terminal knobs are tightly secured and that there is no connection between positive and negative
terminals.
f. Reconnect the input power to the power supply.