Tweco 175i Transtig - Manual (Page 22)

TRANSMIG 175i
INSTALLATION, OPERATION AND SETUP 3-4 Manual 0-5143
1. Power Indicator
The power indicator is illuminated when the correct mains power is applied to the power source and when
the ON/OFF switch located on the rear panel is in the ON position.
2. VRD ON/OFF Indicator Lights (South Pacific Version Only)
!
WARNING
VRD is NOT fitted to Transmig 175i (Asia Version) Plant Part No W1005175M.
A VRD (voltage reduction device) is a hazard reducing device designed to reduce electric shock hazards
present on the output of welding power source when operating in MMAW (stick) mode. Note that the
presence of VRD should not be used as a substitute for the use of appropriate safety practices as indicated
in section one of this manual.
Both the green and red indicator lights only operate in MMAW (stick) mode.
The green VRD ON light illuminates (red light is off) when the VRD is active. Under this condition the open
circuit voltage of the unit is limited to below 35V DC, thus reducing the potential of serious electric shock
(such as when changing electrodes).
The red VRD OFF light illuminates (green light is off) when the VRD is inactive. Under this condition the
output voltage of the unit will be at welding potential which in some cases may exceed 35V DC.
3. Digital Amps Meter
The digital amperage meter is used to display both the pre-set current (Stick and TIG modes only) and
actual output current (all modes) of the power source.
At times of non-welding, the amperage meter will display a pre-set (preview) value in both MMAW (Stick)
and GTAW (TIG) modes. This value can be adjusted by varying the amperage potentiometer (item 4). Note
that in GMAW/FCAW (MIG) mode, the amperage meter will not preview welding current and will display
zero.
When welding, the amperage meter will display actual welding current in all modes.
At the completion of welding, the amperage meter will hold the last recorded amperage value for a period
of approximately 10 seconds in all modes. The amperage 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.
4. Amperage Control (Wirespeed)
The amperage control knob adjusts the amount of welding current delivered by the power source. In
MMAW (stick) and GTAW (TIG) modes, the amperage control knob directly adjusts the power inverter to
deliver the desired level of output current. In GMAW/FCAW modes (MIG), the amperage knob adjusts the
speed of the wire feed motor (which in turn adjusts the output current by varying the amount of MIG wire
delivered to the welding arc). The optimum wire speed 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.
5. 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.