Tweco 186 DC Inverter - Manual (Page 37)

Manual 0-5237 3-7 INSTALLATION, OPERATION AND SETUP
INSTALLATION/SETUP 186 AC/DC INVERTER
1. Thermal Overload
This is due to the duty cycle of the power source being exceeded. Once the power source cools sufficiently
it will automatically reset and the Fault Indicator and Err 001 will go off and the power source is then able
to continue welding. During the time of cooling the power source should remain ON such that the fan
continues to operate allowing the unit to cool sufficiently. If after 30 minutes with the fan running the Fault
Indicator has not gone OFF then have an Accredited Thermal Arc Service Provider check the power source.
2. Primary Circuit Overcurrent
This is due to primary circuit component(s) malfunctioning which results in excessive primary circuit
current. Switch OFF the power source immediately to allow all components to cool down for at least 30
minutes. If after 30 minutes “Err 001” is displayed and Fault Indicator illuminates when the power source
is switched back ON turn the power source OFF and have an Accredited Thermal Arc Service Provider
check the power source.
7. Process Selection Button
The process selection control is used to select the desired welding mode. Three modes are available, GTAW
(LIFT TIG), GTAW (HF TIG) and SMAW (Stick) modes.
Note that when the unit is powered off the mode selection control will automatically default to LIFT 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.
8. Trigger Mode Control Button (HF TIG and LIFT TIG Mode 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.
NOTE
When operating in GTAW (HF and LIFT TIG modes), the power source will remain active until the
selected down slope time has elapsed.
A-11409
High
Low
Figure 3-3
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