Troubleshooting for a pilot arc timeout

Diagnostic code 521

Diagnostic code 521 identifies a problem with ignition of the plasma arc.

Symptoms

Code Symptoms XPR® models XPR action Code cancels with...
521
  • No current is found on the work cable for 500 milliseconds after the pilot arc current is established.
  • For a minimum of 3 milliseconds, the sensor in the work cable cannot measure current greater than the transfer reference value.
 All models End of cycle
  • Start
  • Set process
  • Remote on-off

Corrective action

  1. Make sure that the work lead is connected to the workpiece.
  2. Make sure that the transfer height is correct.
  3. Examine the consumables.
  4. Replace consumables that have damage or excess wear.

Verification

Do a torch lead test. Refer to Do a test for continuity between the nozzle and workpiece.