Tweco PCM - 102 Machine Torch - Manual (Page 38)

SERVICE 5-6 Manual 0-2818
d. Increase the output of the Hi-Pot Tester to a
maximum of 2500 VAC
• If the voltage drops to 0 VAC or leakage
current is detected, then the Torch Head
center insulator is breaking down and the
Torch Head must be replaced.
• If the Torch Head center insulator passes
the test, then proceed to Step 2.
2. To test the Torch Leads for insulation breakdown
use the following procedure:
a. Connect the Hi-Pot Tester between the posi-
tive pilot lead and the negative lead fittings.
The fitting on the other end of the Torch Leads
must be separated (isolated) from each other.
b. Increase the output of the Hi-Pot Tester to a
maximum of 2500 VAC.
• If the voltage drops to 0 VAC or leakage
current is detected, then the insulation be-
tween the Torch Leads is breaking down
and the Torch Leads must be replaced.
• If the Torch Leads passes the test, then pro-
ceed to Step 3.
3. Visually check that the PIP wires, torch switch
wires, pilot lead connection, and negative lead
connections are properly connected and in good
condition (no shorts or arcing).
A-00458
Torch Switch
PIP Pin
PIP Pin
Shield Cup
To Control
Cable Wiring
Figure 5-4A Torch Switch and PIP Schematic -
Machine Torch
A-03761
Torch Trigger
PIP Switch Shield Cup
To Control
Cable Wiring
Torch Switch
Figure 5-4B Torch Switch and PIP Schematic - Hand
Torch
• If problems are evident, repair or replace as re-
quired.
• If there are no visual problems, then proceed
to Step 4.
4. Check the pilot lead, negative lead and switch con-
trol wires for opens from one end of the torch leads
to the other.
• If open, replace leads or open component of
the Torch Leads Assembly.
• If not open, then proceed to Step 5.
5. Check the pilot and switch control wires for shorts
to other components in the Torch Leads.
• If shorted, then replace Torch Leads.
• If not shorted, then proceed to Step 6.
6. Carefully reassemble the components and recheck
the completed assembly per paragraph ‘B’, Step
3 to confirm that the components have been prop-
erly assembled.
This completes the checks for the proper operation of the
Torch Head and Torch Leads.
5.07 Servicing Hand Torch (PCH)
Components
WARNINGS
Disconnect primary power to the system before dis-
assembling the torch, leads, or power supply.
NEVER touch any internal torch parts while the
AC indicator light on the Power Supply is ON.
A. Removing the Hand Torch Head Assembly
The removal of the Torch Head Assembly requires disas-
sembly of the torch handle and leads per the following
procedure:
1. Remove the five screws from the Torch Handle
Assembly. Pull the halves apart and set aside.
A-02823
Handle Screws
(Five Places)
Handle Half
Figure 5-5 Torch Handle Screw Removal