Tweco 38 CutMaster - Manual (Page 41)

Manual 0-2964 5-9 SERVICE
I. Limited output with no control
1. Poor input or output connections
a. Check all input and output connections.
2. Work cable connection to work piece is poor
a. Make sure that work cable has a proper connection to a clean, dry area of the workpiece.
3. Faulty components in unit
a. Return for repair or have qualified technician repair per Service Manual.
J. Erratic or improper cutting output
1. Poor input or output connections
a. Check all input and output connections.
2. Poor work cable connection
a. Make sure that work cable has a proper connection to a clean, dry area of the workpiece.
3. Fluctuations in input power
a. Have electrician check input line voltage.
K. Difficult Starting
1. Worn torch parts (consumables)
a. Shut off input power. Remove and inspect torch shield cup, tip, starter cartridge, and electrode. Replace
electrode or tip if worn; replace starter cartridge if end piece does not move freely; replace shield cup if
excessive spatter adheres to it.
L. 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 (AC indicator flashing; TEMP indicator ON)
a. Check and clear blades.
3. Air flow obstructed (AC indicator flashing; 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 65 psi / 4.5 bar; adjust as needed.
5. Torch consumables worn
a. Check torch shield cup, tip, starter element, and electrode; replace as needed.
6. Faulty components in unit
a. Return for repair or have qualified technician repair per Service Manual.