Hypertherm HT4001 Plasma Arc Cutting System - Manual (Page 44)

6-98
PRE-INSTALLATION
3-4
HT4001
Instruction Manual
Grounding Requirements
Properly ground the HT4001 system for personal safety and to prevent emission of high-frequency interference.
See Appendix F for system grounding requirements.
Connect the worktable to a high-quality earth ground from within 20 feet (6 m) of the table. A suitable ground
consists of a solid copper rod of at least 3/4-inch (19 mm) diameter driven to a depth of at least 15 feet (4.5 m) into
the earth. This will allow ample grounding only if you reach a permanent moisture level. If soil conditions provide no
permanent moisture level, drill a 6-inch (152 mm) hole to a depth of 15 feet (4.5 m) and place a 3/4-inch (19 mm)
copper coated steel rod within the 6-inch hole. Pack down the hole with wet rock-salt. For additional information
consult the National Electric Code, Article 250, Section H Grounding Electrode System, or other appropriate code.
All switches, slow-blow fuses and power cables are customer supplied and must be chosen as directed by
applicable national and/or local electrical codes.
Use a separate primary line disconnect switch for each HT4001 power supply and slave.
Note: Input voltage must not drop below 15% of the values listed below. The power supply will go
into an idle mode and display an error on the control board if the input voltage is too low.
See also Error Codes in Section 6.
Size the disconnect box(es) to the following requirements for the HT4001 power supply:
Rated Input
Input Current @ Recommended
Voltage Phase 89 kVA Output Slow-Blow Fuse Size
200 VAC 3 257 amps 350 amps
220 VAC 3 234 amps 300 amps
240 VAC 3 214 amps 300 amps
380 VAC 3 135 amps 175 amps
400 VAC 3 128 amps 175 amps
415 VAC 3 124 amps 175 amps
440 VAC 3 117 amps 175 amps
480 VAC 3 107 amps 150 amps
575 VAC 3 89 amps 125 amps
600 VAC 3 86 amps 125 amps
WARNING
Electrical installation must be performed by qualified personnel only.
Power Requirements