Torch And Leads Troubleshooting - Thermal Dynamics PAK 200 Operating Manual

PAK 200
2. Slide the rigid insulator between the layers of
estermat paper on the replacement Torch Head
Assembly (see note).
Over a period of time there may be a breakdown
of the estermat paper causing the Torch Head to
short out if the rigid insulator is not installed.
Two Layers Of
Estermat Paper
Rigid Torch
Leads Insulator
Rigid Insulator Installation
3. Secure the rigid insulator in place with electrical
tape.
4. Slide replacement shrink on tubing on leads.
5. Connect the plasma (+), secondary, coolant supply,
(-) and coolant return connectors.
6. Secure leads and tubing with single layer of electri-
cal tape.
7. Slide the torch adapter down over the leads and
screw the adaptor securely onto the back of the
torch head assembly.
8. Slide the positioning tube down over the leads and
thread it into the torch adaptor on the torch head
assembly.
9. Apply tape to the torch leads sleeving at the back
end of the positioning tube.
10. Position shrink on tubing over the tape and
shrink.
11. Install the front end torch parts.
TORCH MAINTENANCE
NOTE
A-01577

7.08 Torch And Leads Troubleshooting

A. General Information
Failures in the Torch and 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.
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 center
insulator does not provide adequate resistance, current
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 iso-
lated from each other. If there is not adequate resistance
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 as follows:
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 of the Power Supply is ON.
1. Remove the consumables from the torch.
2. Disconnect the torch leads from the power supply
to isolate the torch from power supply circuits.
7-8
WARNING
WARNING
Manual 0-5057