Tweco FP-55 - Manual (Page 24)

OPERATION 4-2 Manual 0-2846
5. TEMP Indicator
Normally OFF. Yellow indicator will come ON when the
internal temperature sensors detect temperatures above
normal limits. The unit should be allowed to cool before
continuing operation.
6. GAS Indicator
Green indicator will come ON when the input gas pressure
is set to
35 psi (2.4 bar) or higher. Indicator will be OFF
when the pressure falls below 35 psi (2.4 bar).
7. DC Indicator
Green indicator will come ON while the torch switch is
pressed. Indicates DC output circuit is active.
C. Rear Panel
1. Gas Input Port
Input connection for compressed air input.
WARNING
This unit is not to be used with oxygen (O
2
).
A-02790
1
2
3
Figure 4-3a Rear Panel (units with type A
Regulator/Filter)
A-03042
1
2
3
Figure 4-3b Rear Panel (units with type B Regulator/
Filter)
2. Primary Input Power Cable/Strain Relief
Factory installed primary input power cable strain relief for
the primary power cable, capable of handling the input volt-
age designed for this unit.
3. Gas Pressure Regulator/Filter Assembly
Pressure regulator to adjust the input gas pressure to the
Power Supply. The pressure regulator has its own built-in
air line filter.
Factory installed. For improved filtering, other
filtering packages are available as options.
4.04 Preparations For Operating
This procedure should be followed at the beginning of each
shift:
WARNING
Disconnect primary power at the source before
assembling or disassembling power supply, torch
parts, or torch and leads assemblies.
A. Torch Parts Selection
Check the torch for proper assembly and appropriate
front end torch parts. Refer to the torch manual for
proper parts selection.