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)

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