Troubleshooting - Miller Electric MC-80 Owner's Manual

5-3. Troubleshooting

WARNING
ELECTRIC SHOCK can kill.
Do not touch live electrical parts.
Turn Off cutter, and disconnect input power before
inspecting, maintaining, or servicing.
Trouble
Cutter Gas/Torch trouble light On; cutter
Power light Off; no cutting output.
Unit pilots, but does not transfer.
Sparks come out top of cut, or cut is not
clean.
Arc goes out while cutting.
Arc goes on and off while cutting.
Low cutting capability.
Short torch consumable life.
OM-1592 Page 10
Table 5-1. Cutting Trouble
Remedy
Check for properly installed torch tip. Check for blocked hoses. See
also cutter Owner's Manual.
Check to make sure torch electrode is not touching tip inside the
torch.
Check for clean and sufficient gas/air supply pressure. See cutter
Owner's Manual.
Shorten standoff distance from 1/8 to 1/16 in (3 to 1.6 mm).
Be sure work clamp is securely attached. See power source Own-
er's Manual.
Torch travel speed too fast; reduce travel speed.
Metal being cut is too thick; increase power source output control
setting. See power source Owner's Manual.
Check torch tip and electrode, and replace if needed.
Be sure work clamp is securely attached. See power source Own-
er's Manual.
Make sure torch tip is within 1/8 in (3 mm) standoff distance from
metal while cutting.
Increase travel speed, as needed.
Be sure work clamp is securely attached. See power source Own-
er's Manual.
Torch travel speed is too slow; increase travel speed.
Check torch tip and electrode, and replace if necessary.
Be sure work clamp is securely attached. See power source Own-
er's Manual.
Decrease cutting speed.
Tighten loose torch tip and electrode if needed.
Check torch tip and electrode if needed.
Be sure work clamp is securely attached. See power source Own-
er's Manual.
Maintain standoff distance of 1/16 to 1/8 in (1.6 to 3 mm), or use
standoff guide.
Tighten or replace torch tip and electrode if needed.
HOT PARTS can cause severe burns.
Allow cooling period before maintaining or servicing.
Troubleshooting to be performed only by qualified
persons.
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