OPERATION 4-2 0-5492
1. Process Selection Control
The process selection control is used to select the desired welding mode. Three modes are available, MIG
(GMAW/FCAW), Lift TIG (GTAW), STICK (MMAW) modes. Refer to section 5.09 or 5.10 for MIG (GMAW/FCAW)
set up details, section 7.02 for Lift TIG (GTAW) set-up details or section 6.01 for Stick (MMAW) set-up details.
Note that when the unit is powered off the mode selection control will automatically default to MIG 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.
2. Trigger Mode Control (MIG and Lift TIG Modes WeldSkill 185 only)
The trigger mode control is used to switch the functionality of the torch trigger between 2T (normal) and 4T
(latch mode).
2T Normal Mode
In this mode, the torch trigger must remain depressed for the welding output to be active. Press and hold
the torch trigger to activate the power source (weld). Release the torch trigger switch to cease welding.
4T Latch Mode
This mode of welding is mainly used for long welding runs to reduce operator fatigue. In this mode the
operator can press and release the torch trigger and the output will remain active. To deactivate the power
source, the trigger switch must again be depressed and released, thus eliminating the need for the operator
to hold the torch trigger.
3. Power Indicator
The power indicator is illuminated when nominal 240V AC mains power is applied to the power source and
the ON/OFF switch located on the rear panel is in the ON position.
4. Over Temp Indicator
This welding power source is protected by a self resetting thermostat. The Over Temp indicator will illuminate
if the machine has over heated which normally occurs if the duty cycle of the power source has been exceeded.
Should the Over Temp indicator illuminate the output of the power source will be disabled. Leave the power
source turned On to allow the internal components to cool down. Once the power source cools down sufficiently
the Over Temp indicator will automatically go off. Note that the On/Off switch should remain in the On position
such that the fan continues to operate thus allowing the power source to cool sufficiently. Do not switch the
power source Off if an Over Temp condition is present.
5. VRD ON/OFF Indicator Lights
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 STICK (MMAW) 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.
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.
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