Tweco PCM-62 Machine Torch - Manual (Page 32)

SERVICE 5-4 Manual 0-2817
4. Faulty components in torch and leads assembly
a. Inspect torch assemblies and replace if neces-
sary. Refer to subsection 5.06, Torch and Leads
Troubleshooting.
5. Faulty components in power supply system
a. Return for repair or have qualified technician
repair per Service Manual.
C. Limited cutting output with no control
1. Poor input or output connections to power supply
a. Check all input and output connections.
2. Faulty components in torch and leads assembly
a. Inspect torch assemblies and replace if neces-
sary. Refer to subsection 5.06, Torch & Leads
Troubleshooting.
3. Faulty components in power supply system
a. Return for repair or have qualified technician
repair per Power Supply Service Manual.
D. 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 Page
for the Power Supply being used).
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)
E. No gas flow
1. Gas not connected or pressure too low
a. Check source for proper operating gas pressure
(refer to Appendix Page for the Power Supply
being used).
2. Faulty components in torch and leads assembly
a. Inspect torch assemblies and replace if neces-
sary. Refer to subsection 5.06, Torch and Leads
Troubleshooting.
3. Faulty components in power supply system
a. Return for repair or have qualified technician
repair per Power Supply Service Manual.
F. 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 Page
for the Power Supply being used).
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).
5.06 Torch & Leads Troubleshooting
A. General Information
Failures in the Torch & Leads can be isolated to the Torch
Head or Torch Lead components. To properly isolate the
failed part requires the use of an ohmmeter and a Hi -
Pot Tester.
WARNING
The use of a Hi - Pot Tester should be performed
only by a qualified electronic technician.
In the Torch Head the center insulator separates the nega-
tive and positive charged sections of the torch. If the cen-
ter insulator does not provide adequate resistance, cur-
rent which is intended for the pilot arc may be dissipated
into the torch head, resulting in torch failure.
In the Torch Leads the negative and positive leads are
isolated from each other. If there is not adequate resis-
tance between the leads then torch failure may occur.
B. Quick Check Procedure
This quick check will identify major isolation failures in
the Torch Head or Torch Lead components using an ohm-
meter.
The actual assembly and consumables may vary for dif-
ferent torches but the basic procedure is the same for all
torches. Make the quick check on the Torch Head and
Leads per the following procedure: