Hypertherm HD4070 Rev.8 - Manual (Page 198)

MAINTENANCE
HD4070 Instruction Manual 5-51
7
E. Perform the same protocol for the nitrogen gas supply system, except that the gas system should be
pressurized at the source to 10.3 bar (150 psi), 8.3 bar (120 psi) for the HD3070 and HD4070.
F. Perform the same protocol for the air, carbon dioxide or argon-hydrogen and methane supplies (as
applicable) except that the gas system should be pressurized at the source to 6.2 bar (90 psi), 8.3 bar
(120 psi) for the HD3070 and HD4070.
G. If the system is operating on compressed air, verify that a filtering system is in place to ensure that no oil or
moisture is allowed to enter the plasma system. Inspect all filters and oil separators and recommend
replacement if dirty.
17. Perform a system gas leak test, as follows:
A. Place the gas console in the Test Preflow mode.
Adjust gas flows to appropriate settings as outlined in the Operation section of the instruction manual.
B. Locate the off-valve solenoid and disconnect the control cable from the solenoid. The digital pressure
indicator should slowly drop to zero. If it does not, a leak may be indicated.
C. Close the shut-off valves for the oxygen and nitrogen supply at the source.
D. The pressure gauges on the gas console should maintain their pressure. If either nitrogen
or oxygen pressures drop more than 0.1 bar (2 psi) in 10 minutes, there is an unacceptable leak.
E. If a leak is indicated, check all gas connections, using a soapy water solution.
18. Check for hose restrictions, as follows:
A. Check the 3 hoses connected to the motor valve. Make sure that they are not bent, causing a possible
restriction.
B. Check the gas hoses from the gas console to the motor valve, looking for any sharp bends that may cause
restrictions.
C. Check the off-valve hose from the off-valve to the torch main body. Make sure that the hose is not bent,
causing a restriction.
D. If the cutting table uses a power track system to support leads from the power supply to the gas console or
torch, check the position of the leads in the power track to ensure the leads do not twist or kink, causing a
possible restriction.
Cable connections
19. Cables should be checked for chafing or unusual wear. If the outside insulation has been cut, check the wires
inside for damage:
A. For Initial Height Sensing (IHS) option, check the cables from the inductive probes to the IHS console.
B. Check the control cable from the off-valve to the motor valve console.
C. Check the cable from the motor valve console to the power supply.
D. Check control cables from the high-frequency console and the gas console to the power supply.