Hypertherm Powermax1250 Service Manual - Manual (Page 39)

4
MAINTENANCE
3-6 powermax1250 Service Manual
Troubleshooting preparation
The complexity of the circuits requires that service technicians have a working knowledge of inverter power supply
theory. In addition to being technically qualified, technicians must perform all testing with safety in mind.
If questions or problems arise during servicing, call the nearest Hypertherm Technical Services Department listed in
the front of this manual.
Test equipment
• Multimeter
• IGBT tester (part number 128883)
Troubleshooting procedures and sequence
When performing the troubleshooting procedures,
• Refer to Section 6 for the system wiring diagram;
• Refer to Section 4 to locate power supply components;
• Refer to Section 5 for torch components.
After the problem has been located and repaired, refer to the Sequence of Operation flow diagram in this section to
test the power supply for proper operation.
External inspection
1. Inspect the exterior of the power supply for damage to the cover and external components.
2. Inspect the torch and the torch lead for damage.
Power OFF and
disconnected
External inspection
Power ON
Internal inspection
Resistance checks
Troubleshooting
guide
Troubleshooting
tests