Hypertherm Powermax125 Service Manua - Manual (Page 141)

Powermax125 Service Manual 808070 141
8 – Troubleshooting and System Tests
3-43-0 Inverter capacitors
unbalanced
On On
• Voltage across one or both inverter
capacitors is more than 25% different
than nominal.
480 V CSA units
Bus voltage is 650 VDC.
Nominal is 325 VDC for each capacitor.
Fault condition: < 235 or > 415 VDC
across either capacitor.
600 V CSA units
Bus voltage is 810 VDC.
Nominal is 405 VDC for each capacitor.
Fault condition: < 295 or > 515 VDC
across either capacitor.
400 V CE units
Bus voltage is 540 VDC.
Nominal is 270 VDC for each capacitor.
Fault condition: < 200 or > 360 VDC
across either capacitor.
380 V CCC units
Bus voltage is 510 VDC.
Nominal is 255 VDC for each capacitor.
Fault condition: < 200 or > 360 VDC
across either capacitor.
• Test the IGBT module.
• Replace the bulk capacitors.
3-nn-n
Fault
code
Description
Power
LED Fault
LED Fault
icon
Solutions