Tweco 181i Thermal Arc Fabricator - Manual (Page 39)

Fabricator 181i
Manual 0-51 91 3-9 INSTALLATION, OPERATION AND SETUP
6. MIG Gun Polarity Lead
The polarity lead is used to connect the MIG Gun to the appropriate positive or negative output terminal (allowing
polarity reversal for different welding applications). In general, the polarity lead should be connected in to the
positive welding terminal (+) when using steel, stainless steel or aluminum electrode wire. When using flux
cored (gasless) wire, the polarity lead is generally connected to the negative welding terminal (-). If in doubt,
consult the manufacturer of the electrode wire for the correct polarity. It is essential, however, that the male
plug is inserted and turned securely to achieve a sound electrical connection.
CAUTION
Loose welding terminal connections can cause overheating and result in the male plug being fused in
the bayonet terminal.
7. Negative Welding Output Terminal
The negative welding terminal is used to connect the welding output of the Power Source to the appropriate
welding accessory such as the MIG Gun (via the MIG Gun polarity lead), TIG Torch or work lead. Negative
welding current flows to the Power Source via this heavy duty bayonet type terminal. It is essential, however,
that the male plug is inserted and turned securely to achieve a sound electrical connection.
CAUTION
Loose welding terminal connections can cause overheating and result in the male plug being fused in
the bayonet terminal.
8. Remote Control and Spool Gun Socket
The 8 pin socket is used to connect the Tweco Fusion MIG Gun, remote control device or spool gun plug to
the welding Power Source. To make connections, align keyway, insert plug, and rotate threaded collar fully
clockwise.
Trigger Switch
Remote Wirespeed in MIG (GMAW/FCAW) mode
Remote Amps in LIFT TIG (GTAW) mode
Remote Volts in
MIG (GMAW/FCAW)
1
2
3
4
5
6
7
8
W V
3 4 5
6 7 8
1 2
Negative
Spool Gun Motor
Positive
Art # A-10421_AC
Figure 3-7: Remote Control Socket
Socket Pin Function
1 Spool gun motor (0V)
2 Trigger Switch Input
3 Trigger Switch Input
4 Spool gun motor (+24V DC)
5 5k ohm (maximum) connection to 5k ohm remote control potentiometer.
6 Zero ohm (minimum) connection to 5k ohm remote control potentiometer.
7
Wiper arm connection to 5k ohm potentiometer for the remote control of the Wirespeed in MIG mode.
Wiper arm connection to 5k ohm potentiometer for the remote control of the Amperage (Weld Current) in LIFT
TIG mode.
8 Wiper arm connection to 5k ohm remote control Volts MIG mode potentiometer.
Table 3-3