Hypertherm HD4070 Rev.1 - Manual (Page 200)

HyPerformance HD4070 Instruction Manual 5-37
MAINTENANCE
Leak test procedure
1. Locate the off-valve assembly. It will be within 1.8 meters (6 feet) of the torch receptacle. See Installation section
page 3-11.
2. Disconnect the power cable to the off-valve assembly. See Installation section page 3A-10 or 3B-14.
3. Turn the power supply ON.
4. After the system initializes, it will attempt to purge gas through the torch. No gas will flow through the torch,
because the off-valve has been disconnected, but the system will complete the purge cycle. The gas lines are
now pressurized.
5. After the purge cycle finishes, locate the supply gas valves for the chosen process and turn them OFF.
6. Monitor the gauges on the pressure regulators for a minimum of 20 minutes.
7. The gas pressures may drop initially but should stabilize within 5 minutes. If one or both pressures continue to
drop, there is a leak in the system.
8. To find the leak, repeat steps 1 through 5. Then spray all gas fittings in the system with soapy water. Look for
bubbles around fittings.
9. After the leak has been isolated and repaired, repeat steps 1 through 5 to ensure that there are no other leaks in
the system.
Setting regulator pressure
1. Turn power supply ON
2. Press set-up on touch screen. Press “NEXT” on screen 4.
3. Press “ALTERNATE” so it reads ON. Press “DONE” twice.
4. Choose a process and navigate to screen 14.
5. After the purge cycle is complete, press “PREFLOW TEST” to turn preflow gas ON.
6. Press Hypertherm logo to get to service screen (#17)
7. Set the shield gas regulator, at the source, so the pressure on the service screen reads 8.3 bar (120 psi). Press
“NEXT” twice to return to screen 14.
8. Press “PREFLOW TEST” to turn the gas flow OFF.
9. Repeat steps 5 through 8 for “CUTFLOW TEST” to set plasma gas pressure.
The shield and plasma gases are now properly set.