Tweco 42 CutMaster Service Manual - Manual (Page 39)

TROUBLESHOOTING CUTMASTER 42
Manual 0-5171 6-3 Troubleshooting
3. Faulty components in unit
a. Return for repair or have qualified technician repair per service manual.
I. Cutting output is unstable or inadequate at 120V operation.
1. Low or fluctuating input voltage
a. Turn output current to minimum (20 amps) and suggest using 20A Drag tip.
b. Connect to a dedicated input line voltage.
c. Have electrician check input line voltage under load.
2. Input or output connection is poor
a. Check all input and output connection leads.
3. Working cable connection is poor.
a. Make sure that work cable has a proper connection to a clean, dry area of the work piece.
J. Hard to startup
1. Torch parts worn (consumables)
a. Turn off input power, remove shield cup, tip, start cartridge, and electrode and check them all. If the
electrode or cutting tip is worn out, replace them. If the start cartridge does not move freely, replace it. If
there is too much spatter on shield cup, replace it.
K. Arc goes out while operating. Arc can’t be restarted when torch trigger 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.
2. Fan blades blocked (TEMP indicator ON).
a. Check and clear blades.
3. Air flow blocked
a. Check for blocked air flow around the unit and correct condition.
4. Gas pressure is too low. (Air indicator ON when torch trigger is activated.)
a. Check gas source. Adjust to proper setting value.
5. Torch parts worn
a. Check torch shield cup, cutting tip, start cartridge and electrode. Replace as needed.
6. Faulty component in unit
a. Return for repair or have qualified technician repair per service manual.
L. Torch cuts but not well.
1. Current control is set too low.
a. Increase the current setting.
2. Torch is being moved too fast across work piece
a. Reduce cutting speed.