Module grounding and grounding checks -3, Noise levels (decibels) -3, Module grounding and grounding checks – Hypertherm HT4001 Plasma Arc Cutting System User Manual
Page 56: Noise levels (decibels)
INSTALLATION
6-98
HT4001
Instruction Manual
4-3
Module Grounding and Grounding Checks
Please refer to Grounding Requirements in the Pre-Installation section of this manual for earth ground
specifications.
See Appendix F for system grounding requirements.
Before operating the HT4001, perform the following grounding checks to ensure proper operation, personal safety,
and to reduce emission of radio-frequency interference:
• Ensure the power cord ground wire is properly connected to the ground in the line disconnect box.
• Ensure the power cord ground wire is properly connected to the HT4001 power supply chassis. Refer to
Connecting the Power in the Pre-Installation section of this manual.
• Ensure that all electrical connections are tight to avoid excessive heating.
Figure 4-1
Noise Levels (Decibels)
Noise Levels (Decibels)
Figure 4-1 presents the noise levels in decibels experienced by an operator standing 10 feet (3 m) from the torch in
a confined area under varied conditions while cutting mild steel.
•
Without Water Muffler –
102 dbs
•
With Water Muffler using
oxygen at 260 Amps –
85 dbs
•
With Water Muffler using
nitrogen at 400 Amps –
89 dbs
•
Water 3" over plate with
Water Muffler using
oxygen or nitrogen –
less than 85 dbs