Tweco 51 with SL100SV CutMaster - Manual (Page 74)

SERVICE 5-10 Manual 0-4640
5
M. Arc shuts off during operation; arc will not restart when torch switch is activated.
1. Power Supply is overheated (TEMP indicator ON)
a. Let unit cool down for at least 5 minutes. Make sure the unit has not been operated beyond Duty Cycle limit. Refer to
Section 2 for duty cycle specifications.
2. Fan blades blocked (TEMP indicator ON)
a. Check and clear blades.
3. Air flow obstructed (TEMP indicator ON)
a. Check for obstructed air flow around the unit and correct condition.
4. Gas pressure too low (GAS indicator OFF when torch switch is activated)
a. Check source for at least 60 psi / 4.1 bar; adjust as needed. (Minimum pressure for power supply operation
is lower than minimum required for torch operation.)
5. Torch consumables worn
a. Check torch consumables; replace as needed.
N. AC indicator remains ON when shield cup is removed
1. Faulty PIP switch in torch
a. Check PIP switch for continuity; replace if necessary