Polarity Changeover - Thermal Arc Fabricator 140 Service Manual

FABRICATOR 140, 180

3.08 Polarity Changeover

ELECTRIC SHOCK CAN KILL! Make certain the machine is unplugged from the power receptacle. Do not
plug machine in until told to do so in these instructions
As delivered from the factory, the output polarity is connected as DCEP (reverse polarity). The output terminals are
located on the interior panel of the welding power source.
PROCESS
1. GMAW* – Solid Wire &
flux cored with shielding gas
2. FCAW* – Self-shielding
Wire – no Shielding Gas
* Exception: Contact your filler metal supplier for recommended polarity.
Connection for GMAW (reverse polarity DCEP)
1. Open the door to the machine.
2. Remove the polarity terminal knobs.
3. Set up the polarity (as per Table 3-1 above) by
removing the leads from the terminals and
reversing them if necessary. Refer to Figure 3-4.
4. Replace the polarity terminal knobs.
Ensure that the polarity terminal knobs are
tightly secured and that there is no connection
between positive and negative terminals.
Connection for FCAW (straight polarity DCEN)
1. Open the door to the machine.
2. Remove the polarity terminal knobs.
3. Set up the polarity (as per Table 3-1 above) by
removing the leads from the terminals and
reversing them if necessary. Refer to Figure 3-5.
4. Replace the polarity terminal knobs.
Ensure that polarity terminal knobs are tightly
secured and that there is no connection
between positive and negative terminals.
Manual 0-4992
POLARITY
1. DCEP – Reverse Polarity* 1. Connected to (+)
2. DCEN – Straight Polarity* 2. Connected to (-)
Table 3-1: Process Cable Connections
NOTE
NOTE
!
WARNING
CABLE TO GUN
Pos. output terminal
Neg. output terminal
Polarity
Terminal
Knobs
Polarity
Terminal
Leads
Figure 3-4: Connection for GMAW (reverse polarity DCEP)
Polarity
Terminal
Knobs
Polarity
Terminal
Leads
Figure 3-5: Connection for FCAW (straight polarity DCEN)
3-6
INSTALLATION
CABLE CONNECTIONS
CABLE TO WORK
1. Connected to (-)
Neg. output terminal
2. Connected to (+)
Pos. output terminal
Gas Hose
Normally
Connected
Art # A-08336
Gas Hose
Normally
Disconnected
Art # A-08337
January 25, 2008