Hypertherm HD4070 Rev.1 - Manual (Page 214)

HyPerformance HD4070 Instruction Manual 5-51
MAINTENANCE
16. If the the gas line pressures hold steady, perform a system gas leak test as specified in this manual.
17. Check for hose restrictions, as follows:
A. Check all hoses to verify that they have no kinks or sharp bends, which can restrict gas flow.
B. 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
18. All cables should be checked for chafing or unusual wear. If the outside insulation has been cut or otherwise
damaged, replace the cable.
Ignition console
19. Open the cover and use compressed air to blow out any accumulation of dust and particulates. If moisture is
present, dry the inside of the console with a cloth and try to identify the source of the moisture.
20. Inspect the spark gap assembly. Ensure that the wiring connections to the spark gap assembly are secure.
Check that the console doors close properly.
21. Inspect the torch leads. Ensure that they are fastened tightly to the outside of the ignition console.
System grounding
22. Verify that all components of the system are individually grounded to a driven earth ground, as described in the
Installation and Grounding sections of this manual.
A. All metal enclosures, such as the power supply, ignition console and selection console, should be
connected individually to a ground point. These connections should be made with 10 mm 2 (#8 AWG) wire
(USA), or equivalent-size wire.
23. Check the work lead (+) connection, particularly where the work lead (+) connects to the cutting table. This
must be a good, clean connection because a poor connection may cause arc-transfer problems.
24. Complete the Preventive Maintenance worksheet on the next page, for future reference.