Tweco 300Pi Transtig Welding Inverter - Manual (Page 26)

TRANSTIG 300Pi
INSTALLATION, OPERATION AND SETUP 3-8 Manual 0-5309
Note that when the unit is powered on the mode selection control will automatically default to LIFT TIG/HF
TIG mode. This is necessary so as to prevent inadvertent arcing should an electrode holder be connected
to the unit and mistakenly be in contact with the work piece during power up.
12. Forward Button
When not welding, the Forward Button is used to set the parameter being adjusted, including welding
amps. Pressing the Forward Button will save the parameter value, then increment to the next available
parameter. The parameter LED will illuminate and the Multi Function Control will then adjust the parameter.
The parameter value is shown on the meter (figure 3-1, Item 2) and the LED's next to the meter indicate
if the parameter is Amps, Seconds, %, or Hz. The parameter is saved after 20 seconds if there has been
no user adjustment.
13. Back Button
When not welding, the Back Button is used to set the parameter being adjusted, including welding amps.
Pressing the Back Button will save the parameter value, then decrement to the next available parameter. The
parameter LED will illuminate and the Multi Function Control will then adjust the parameter. The parameter
value is shown on the meter (figure 3-1, Item 2) and the LED's next to the meter indicate if the parameter is
Amps, Seconds, %, or Hz. The parameter is saved after 20 seconds if there has been no user adjustment.
14. Purge Button
Press and hold the PURGE button to purge the gas line in LIFT TIG and HF TIG modes. The purge indicator
LED will illuminate and shielding gas will purge up to a maximum period of 30 seconds. (This cannot be
adjusted). To stop shielding gas from purging release the PURGE button and the purge indicator LED will
extinguish and shielding gas will cease to flow.
15. Thermal Overload Indicator
This welding power source is protected by a self resetting thermostat. The indicator will illuminate if the
duty cycle of the power source has been exceeded. Should the thermal overload indicator illuminate the
output of the power source will be disabled. Once the power source cools down this light will go OFF and
the over temperature 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 thermal overload condition be present.
The display will also show error code E-- in the event of an over current or over temperature.
A-12123
16. Shielding Gas Inlet
The Shielding Gas Inlet connection is used to supply the appropriate shielding gas to the unit. Refer to
section 3.07 for GTAW (TIG) set up details.
!
WARNING
Only Inert Shielding Gases specifically designed for welding applications should be used.
17. On / Off Switch
This switch is used to turn the unit on/off.