Troubleshooting for pressure out is greater than pressure in

Diagnostic code 720

Diagnostic code 720 occurs when the output pressure is more than the input pressure on the mixer.

Symptoms

Code Symptoms XPR® models XPR action Code cancels with...
720

Pressure out (P21) is more than one of the pressures on the inlet side of the mixer (P10 – P12) by 0.069 bar (1 psi) or more. (OptiMix™ only)

When this occurs, the mixer decreases flow to prevent backflow, which can have an effect on cut quality.

 All models None
  • Start
  • Set process
  • Remote on-off

Corrective action

  1. Make sure that the consumables are correct.
  2. Make sure that the supply gas pressure is sufficient.
  3. Make sure that there is a sufficient quantity of gas in the gas cylinders, if necessary.
  4. Increase the N2, Ar, and H2 pressure during test cutflow to be in the permitted range.
  5. Make sure that you have the most recent XPR firmware.

    You can log into the Xnet at www.hypertherm.com to download it.