Hypertherm HT4001 Plasma Arc Cutting System - Manual (Page 129)

MAINTENANCE
16
HT4001
Instruction Manual 6-3
Routine Maintenance
The HT4001 system is designed to require little regular maintenance under normal use. The following
maintenance checks, are suggested to keep your system in top running condition.
Torch and Torch Leads (See also Torch Coolant Draining at the end of this section)
Inspection
Inspect the torch and torch leads on a routine basis.
• The torch consumable parts and torch main body should always be inspected prior to cutting. Worn or
damaged parts can cause gas and water leaks which can affect the cut quality. Check for pitting and burn
marks on the consumable parts and replace, if necessary. See Changing Consumable Parts in Section 5.
• Ensure that all connections are tight, but do not overtighten.
• The torch leads should be checked occasionally for cracking and damage.
Power Supplies
Inspection
Inspect the power supplies on a routine basis
• Check the exterior for any damage. If there is damage, ensure it does not affect safe operation of the
power supply.
• Remove covers and inspect the interior. Check wiring harnesses and connections for wear and damage.
Check for loose connections, and look for areas of discoloration due to overheating.
• Inspect the contacts on the contactor every 2 months. Worn contacts can be replaced by ordering kit
129972 for all voltages except 200V or 129973 for 200V power supplies.
Cleaning
Cleaning the power supply periodically is necessary to keep dust and foreign matter from inside the unit.
• Remove the covers and blow out the unit with compressed air. In an excessively dirty environment, clean
the power supply on a weekly basis.
Protecting Copper Surfaces
To protect copper surfaces in the injection water/torch coolant open loop, do the following twice a year:
1. Mix a 16 ounce container of corrosion inhibitor benzotriazole (128020) in the water chiller's 45 gallon water
reservoir.
2. Turn on the water chiller and run the pump for 2 hours. Do not start the power supply or attempt to cut with the
torch while recirculating the solution.
3. Turn water chiller off and leave power supply off for 8 hours.
4. Resume normal operating procedures.