MAINTENANCE
HPR400XD Manual Gas Instruction Manual 5-3
WARNING
SHOCK HAZARD
Use extreme care when working near the chopper modules. The large blue capacitors store high
voltage. Even if the power is off, dangerous voltages exist at the capacitor terminals, on the chopper
and the heatsinks. Discharging any capacitor with a screwdriver or other implement may result in an
explosion, property damage or personal injury. Wait at least 5 minutes after turning the power supply
off before touching the chopper or the capacitors.
Introduction
Hypertherm assumes that the service personnel performing the troubleshooting testing are high-level
electronic service technicians who have worked with high-voltage electro-mechanical systems. Knowledge
of final isolation troubleshooting techniques is also assumed.
In addition to being technically qualified, maintenance personnel must perform all testing with safety in
mind. Refer to the Safety section for operating precautions and warning formats.
Routine maintenance
For a complete list of routine maintenance recommendations, see the Preventive Maintenance Schedule, located at the
end of this section. Contact the Technical Services department listed at the front of this manual with any questions
regarding the maintenance schedule or procedures.
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