Miller Electric Spectrum 1250R - Manual (Page 34)

OM-217 Page 30
SECTION 7 – HF IN PLASMA CUTTING
7-1. High Frequency In Plasma Arc Cutting (PAC)
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high_freq2 4/95 – S-0753
1 Plasma Arc Torch
2 High-Frequency Voltage
Used inside torch to ionize gap
between electrode and tip to help
start the pilot arc.
3 Electrode
4 Pilot Arc
5 Tip
6 Shield Cup
1
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5
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2
Work
Plasma Arc Cutting (PAC)
7-2. Sources Of High-Frequency Radiation From Incorrect Installation
50 ft
(15 m)
S-0754
Sources Of Direct High-Frequency
Radiation
1 High-Frequency Source (Plasma Arc
Cutting Power Source)
2 Cables
3 Torch
4 Work Clamp
5 Workpiece
6 Work Table
Sources Of Conduction Of High
Frequency
7 Input Power Cable
8 Line Disconnect Device
9 Input Supply Wiring
Sources Of Reradiation Of High
Frequency
10 Ungrounded Metal Objects
11 Lighting
12 Wiring
13 Water Pipes And Fixtures
14 External Phone And Power Lines
9
3
1
Cutting Zone
13 2
4 5
6
8
7
10
11, 12
14