6. What system do you have?
XPR170 Go to step 8 on page 330.
XPR300 or XPR460 Continue with the next step.
7. Interchange the choppers, and make sure that the diagnostic code aligns with the change:
a. If yes, the chopper is bad and must be replaced.
b. If no, continue with the next step.
8. Examine the choppers and inductors.
9. Replace choppers or inductors that have damage, if found.
10. Make sure that the arc stays on the workpiece during cutting.
11. Make sure to use the correct techniques and ramp-down settings, especially for cutting holes in simple
shapes on aluminum or stainless steel.
If you do not use proper cutting techniques, diagnostic codes 552 – 554 can replace the diagnostic
code for ramp-down errors (620) when the arc distance between the torch and the workpiece
increases quickly.
12. If you cannot find or correct the problem, speak to your cutting machine supplier or regional
Hypertherm Technical Service team.
Troubleshooting for high current
Diagnostic codes 555, 556, 557
Diagnostic codes 555 – 557 identify when the chopper current is too high.
Symptoms
Code Symptoms XPR models XPR action Code cancels with...
555 For a minimum of 10 milliseconds, the electric cur-
rent for Chopper 1 is more than 170 A.
All models
556 For a minimum of 10 milliseconds, the electric cur-
rent for Chopper 2 is more than 170 A.
XPR300,
XPR460
557 For a minimum of 10 milliseconds, the electric cur-
rent for Chopper 3 is more than 170 A.
XPR460
Shut down Remote on-off
Diagnostics and Troubleshooting
8
330
811530 Instruction Manual XPR460
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