Tweco 1000 Cutting Systems - Manual (Page 37)

Manual 0-2710 5-5 SERVICE
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 Appendix 2, Cut-
ting Speed Charts).
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)
F. No gas flow
1. Gas not connected or pressure too low
a. Check source for at least 90 psi (6.2 bar).
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.
G. Torch cuts but not adequately
1. Current set too low at power supply
a. Increase current setting
2. Torch is being moved too fast across workpiece
a. Reduce cutting speed (refer to Appendix 2, Cut-
ting Speed Charts).
3. 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)
4. Torch tip contacting workpiece
a. Increase standoff distance
5. Torch tip worn
a. Replace tip
6. Incorrect gas pressure
a. Set correct gas pressure
5.06 Servicing Torch Components
WARNINGS
Disconnect primary power to the system before
disassembling the torch or torch leads.
DO NOT touch any internal torch parts while the
AC indicator light on the front panel of the Power
Supply is ON.
A. Removing Torch Head
1. Remove the shield cup, tip, gas distributor and
electrode from the torch head assembly.
2. Locate the shrink-on tubing at the back end of the
torch positioning tube. Remove the shrink-on tub-
ing from the torch lead sleeving being careful not
to damage the lead assembly underneath.
3. Under the shrink-on tubing remove the tape from
the torch lead sleeving and slide the sleeving back
(see NOTE).
NOTE
The positioning tube will not slide over the torch
lead sleeving.
4. Unscrew the positioning tube from the torch adap-
tor on the torch head assembly and slide the posi-
tioning tube back over the leads.
5. Unscrew the torch adaptor from the torch head
assembly. Slide the torch adaptor back over the
leads to expose the plasma (+), secondary, cool-
ant supply (-), and coolant return connectors.
Positioning Tube
Torch Adaptor
Lead Connections
A-00663
Bushing
Pinion Assembly
Machine
Torch Head
Figure 5-6 Torch Mounting Assembly
6. Disconnect the plasma (+), secondary, coolant sup-
ply (-), and coolant return connectors to allow re-
moval of the torch head. Note the location of the
torch leads insulator which separates the nega-
tive and positive leads.