Thermal Arc 181i FABRICATOR Service Manual page 25

OPERATION
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 torch (via the MIG torch 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.
Loose welding terminal connections can cause overheating and result in the male plug being fused
in the bayonet terminal.
8. Remote Control Socket
The 8 pin Remote Control Socket is used to connect remote control devices to the welding power source.
To make connections, align keyway, insert plug, and rotate threaded collar fully clockwise.
Socket Pin
1 Not connected
2
Trigger Switch Input
3
Trigger Switch Input
4
Not connected
5
5k ohm (maximum) connection to 5k ohm remote control potentiometer.
6
Zero ohm (minimum) connection to 5k ohm remote control potentiometer.
Wiper arm connection to 5k ohm remote control Wirespeed GMAW (MIG) mode potentiometer.
7
Wiper arm connection to 5k ohm remote control Amps GTAW (TIG) mode potentiometer.
8
Wiper arm connection to 5k ohm remote control Volts GMAW (MIG) mode potentiometer.
Note that the remote local switch (item 18) located in the wirefeed compartment should be set to remote
for the amperage/voltage controls to be operative.
9. Multifunction Control - Voltage, Down Slope & Arc Force
The multifunction control knob is used to adjust three main parameters depending on the welding mode
selected.
When GMAW/FCAW (MIG) Mode is Selected
In this mode the control knob is used to adjust the output voltage of the unit. The welding voltage is
increased by turning the knob clockwise or decreased by turning the knob anti-clockwise. The optimum
voltage level required will dependent on the type of welding application. The setup chart on the inside
of the wire feed compartment door provides a brief summary of the required output settings for a basic
range of MIG welding applications.
Manual 0-5152
2 1
5
4 3
8 7 6
A-09594_AC
Figure 4-4: Remote Control Socket
CAUTION
1
2
Trigger Switch
3
4
Remote Volts in
5
GMAW Mode
W V
6
7
8
Remote Wirespeed in GMAW mode
Remote Amps in GTAW mode
Function
Table 4-1
4-3
FABRICATOR 181i
Operation