Tweco 39 CutMaster - Manual (Page 52)

cutmaster 39
SERVICE 5-8 Manual 0-4975
3. Faulty torch parts
a. Inspect torch parts and replace if necessary.
4. Gas pressure too high or too low
a. Adjust to proper pressure.
5. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
H. No cutting output; Torch activated; AC indicator
ON; Gas flows; Fan operates
1. Torch not properly connected to power supply
a. Check that torch leads are properly connected
to power supply.
2. Work cable not connected to work piece, or connection
is poor
a. Make sure that work cable has a proper con-
nection to a clean, dry area of the workpiece.
3. Shield cup not properly installed on torch
a. Open main disconnect switch. Check that
shield cup is fully seated against torch head.
Set ON / OFF switch to OFF, check shield
cup, close main disconnect switch, turn power
supply ON, and try cutting.
4. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
5. Faulty Torch
a. Return for repair or have qualified technician
repair.
I. Low cutting output
1. Incorrect setting of CURRENT (A) control
a. Check and adjust to proper setting.
2. Faulty components in unit
a. Return for repair or have qualified technician
repair.
J. 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 con-
nection 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.
K. 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 con-
nection to a clean, dry area of the workpiece.
3. Fluctuations in input power
a. Have electrician check input line voltage.
L. 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.
M. Arc shuts off during operation; arc will not re-
start 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.