Tweco 175i Transtig - Manual (Page 26)

TRANSMIG 175i
INSTALLATION, OPERATION AND SETUP 3-8 Manual 0-5143
At the completion of welding, the digital voltage meter will hold the last recorded voltage value for a period
of approximately 10 seconds in all modes. The voltage meter will hold the value until; (1) any of the front
panel controls are adjusted in which case the unit will revert to preview mode, (2) welding is recommenced,
in which case actual welding amperage will be displayed, or (3) a period of 10 seconds elapses following
the completion of welding in which case the unit will return to preview mode.
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.
16. Gas Inlet (MIG mode only)
The Gas Inlet connection is used to supply the appropriate MIG welding gas to the unit. Refer to section
3.15 or 3.16 for FCAW/GMAW (MIG) 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.
18. Local / Remote Switch (located in wirefeed compartment)
The remote / local switch is used only when a remote control device (such as a TIG torch with remote
current control) is fitted to the unit via the remote control socket (item 9). When the local/remote switch is
in the remote position, the unit will detect a remote device and work accordingly. When in the local mode,
the unit will not detect the remote device and will operate from the power source controls only. Note that
the trigger will operate at all times on the remote control socket irrespective of the position of the local
remote switch (ie in both local and remote modes).
Should a remote device be connected and the remote/local switch set to remote, the maximum setting
of the power source will be determined by the respective front panel control, irrespective of the remote
control device setting. As an example, if the output current on the power source front panel is set to 50%
and the remote control device is set to 100%, the maximum achievable output from the unit will be 50%.
Should 100% output be required, the respective front panel control must be set to 100%, in which case
the remote device will then be able to control between 0-100% output.
19. Burnback Control (located in wirefeed compartment)
The burnback control is used to adjust the amount of MIG wire that protrudes from the MIG torch after
the completion of MIG welding (commonly referred to as stick out). To decrease the burnback time (or
lengthen the amount of wire protruding from the MIG torch at the completing of welding), turn the burnback
control knob anti clockwise. To increase the burnback time (or shorten the amount of wire protruding from
the torch at the completing of welding), turn the Burnback Control knob clockwise.
20. Fan on Demand
The Transmig 175i is fitted with a fan on demand feature. Fan on demand automatically switches the cooling
fan off when it is not required. This has two main advantages; (1) to minimize power consumption, and
(2) to minimise the amount of contaminants such as dust that are drawn into the power source.
Note that the fan will only operate when required for cooling purposes and will automatically switch off
when not required.