Hypertherm HD4070 Rev.1 - Manual (Page 212)

HyPerformance HD4070 Instruction Manual 5-49
MAINTENANCE
Preventive maintenance
Introduction
Deteriorating consumable parts life is one of the first indications that something is wrong with a plasma system.
Reduced parts life increases operating costs in two ways: the operator must use more electrodes and nozzles to
cut the same amount of metal, and the work of cutting must stop more often to change consumables.
Proper maintenance often eliminates the problems that shorten the life of consumable parts. Since labor and
overhead can account for 80% of the cost of cutting, improved productivity can reduce cutting costs dramatically.
Preventive maintenance protocol
The following protocol covers the basic elements of all Hypertherm HyPerformance plasma systems.
If inspection suggests that a component is worn and might require replacement, and you would like confirmation of
your decision, please contact Hypertherm's Technical Service department.
The power supply
WARNING
ELECTRIC SHOCK CAN KILL
Turn off all electrical power before removing the power supply cover and set the
line disconnect switch to OFF. In the U.S., use a “lock-out and tag-out” procedure
until the service or maintenance is complete. In other countries, follow appropriate
local or national safety procedures.
1. With power to the power supply turned off, remove all side panels. Use compressed air to blow out any
accumulation of dust and particulates.
2. Inspect wiring harnesses and connections for wear, damage or loose connections. If you see any discoloration
that might indicate overheating, contact Hypertherm Technical Service.
3. Inspect the main contactor for excessive pitting on the contacts, characterized by a blackened, rough surface on
any of the contacts. If this condition exists, replacement is recommended.
4. Inspect the pilot arc relay (CR1) for excessive pitting on the contacts, characterized by a roughened, black
surface. Replace if necessary.