Tweco 350 4R Wirefeeder - Manual (Page 26)

4-2 Manual 0-5182
weldskill 250, 350 operation
Operation
3. VOLTAGE CONTROL SWITCH - FINE (WELDSKILL 350 ONLY)
The Fine Voltage Control switch increases the welding voltage (in smaller increments than the Coarse
switch) as it is rotated in a clockwise direction.
CAUTION
The Coarse & Fine Voltage Control switches MUST NOT BE SWITCHED during the welding
process.
4. VOLTAGE CONTROL SWITCH - COARSE (WELDSKILL 350 ONLY)
The Coarse Voltage Control increases the welding voltage (in larger increments than the Fine switch) as
it is rotated in a clockwise direction.
CAUTION
The Coarse & Fine Voltage Control switches MUST NOT BE SWITCHED during the welding pro-
cess.
5. TORCH POLARITY LEAD
This lead selects the welding voltage polarity of the electrode wire. Plug it into the positive welding terminal
(+) when using steel, stainless steel or aluminium electrode wire. Plug the Torch Polarity Lead into the
negative welding terminal (-) when using gasless electrode wire. If in doubt, consult the manufacturer of
the electrode wire for the correct polarity.
6. POSITIVE WELDING TERMINAL
Positive Welding Terminal. Welding current flows from the Power Source via heavy duty bayonet type
terminals. It is essential, however, that the male plug is inserted and turned securely to achieve a sound
electrical connection.
7. NEGATIVE WELDING TERMINAL
Negative Welding Terminal. Welding current flows from the Power Source via heavy duty bayonet type
terminals. 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 terminal.
8. MIG TORCH ADAPTOR (Euro Style)
The MIG torch adaptor is the connection point for the MIG welding torch. Connect the torch by pushing
the torch connector into the brass torch adaptor firmly and screwing the plastic torch nut clockwise to
secure in position. To remove the MIG Torch simply reverse these directions.
9. OVERHEAT INDICATOR
This welding power source is protected by a self resetting thermostat. The overheat indicator will illumi-
nate if the duty cycle of the power source has been exceeded. Should the overheat indicator illuminate
the output of the power source will be disabled. Once the power source cools down this indicator will go
OFF and the overheat condition will automatically reset. Note that the mains power switch should remain
in the on position such that the fan continues to operate thus allowing the unit to cool sufficiently. Do not
switch the unit off should a overheat condition be present.