Tweco XTTM-301 - Manual (Page 62)

SERVICE 5-8 Manual 0-4768
A. Torch will not pilot when torch switch is activated
1. Power Supply RUN/SET switch in SET position
a. Place RUN/SET switch to RUN position.
2. Torch switch activated during power on purge
a. Release torch switch and wait at least 20 sec-
onds before activating switch again
3. Faulty torch parts
a. Inspect torch parts and replace if necessary. Re-
fer to Section 5.04.
4. Gas pressure too high
a. Set pressure per the speed charts in the Appen-
dix.
5. Faulty components in torch and leads assembly
a. Inspect torch assemblies and replace if neces-
sary. Refer to Section 5.07, Torch and Leads
Troubleshooting.
6. Faulty components in power supply system components
a. Return for repair or have qualified technician
repair per Service Manual.
B. No cutting output
1. Torch not properly connected to power supply
a. Check that torch leads are properly attached to
power supply
2. Faulty components in torch and leads assembly
a. Inspect torch assemblies and replace if neces-
sary. Refer to Section 5.07, Torch and Leads
Troubleshooting.
3. Faulty components in power supply system components
a. Return for repair or have qualified technician
repair per Service Manual.
C. Low cutting output with no control
1. Incorrect setting of AMPERAGE control on power sup-
ply
a. Check and adjust to proper setting.
2. Torch tip contacting workpiece
a. Increase standoff distance
3. Faulty components in torch and leads assembly
a. Inspect torch assemblies and replace if neces-
sary. Refer to Section 5.07, Torch and Leads
Troubleshooting.
4. Faulty components in power supply system components
a. Return for repair or have qualified technician
repair per Service Manual.
D. Limited output with no control
1. Poor input or output connections to power supply
a. Check all input and output connections.
2. Incorrect setting of CURRENT control on power supply
a. Check and adjust to proper setting.
3. Faulty components in torch and leads assembly
a. Inspect torch assemblies and replace if neces-
sary. Refer to Section 5.07, Torch and Leads
Troubleshooting.
4. Faulty components in power supply system components
a. Return for repair or have qualified technician
repair per Service Manual.
E. Erratic or improper cutting output
1. Poor input or output connections to power supply
a. Check all input and output connections.
2. Current set too low at power supply
a. Increase current setting.
3. Torch is being moved too fast across workpiece
a. Reduce cutting speed (refer to Cutting Speed
Charts in the Appendix).
4. Excessive oil or moisture in torch
a. Hold torch 1/8 inch (3 mm) from clean surface
while purging and observe oil or moisture
buildup (do not activate torch)