Troubleshooting for start switch faults

Diagnostic codes 570, 571, 574 – 577

Diagnostic codes 570 – 577 can identify problems with the Computer Numerical Control (CNC), Printed Circuit Board (PCB), discrete cable, or the D50 Light Emitting Diode (LED) on the control PCB (PCB 1) in the plasma power supply.

Symptoms

Code Symptoms XPR® models XPR action Code cancels with...
570 The Plasma Start switch is in the ON position before the cutting system goes into the Power-up state. All models None
  • Start
  • Set process
  • Remote on-off
571 The Plasma Start switch is in the ON position before the cutting system goes into the Wait for Start state.
574 The Plasma Start switch goes to the OFF position during the Preflow/Charge DC state. All models End of cycle
  • Start
  • Set process
  • Remote on-off
575 The Plasma Start switch goes to the OFF position during the Ignite state.
576 The Plasma Start switch goes to the OFF position during the Pilot Arc state.
577 The Plasma Start switch goes to the OFF position during the Ramp-up state.

Corrective action

  1. Use the CNC or XPR web interface to make sure that the status of the cutting system is correct and to make sure that a cutting sequence is not active.
  2. Remove the power from the cutting system.
  3. Remove the control-side panel from the plasma power supply.
  4. Supply power to the cutting system.
  5. If the code continues after you supply power to the cutting system, examine the D50 LED on the control PCB (PCB 1) in the plasma power supply to find if it is illuminated.
    If you see this condition...Do these steps...
    D50 is not illuminated. There is a problem with the CNC. Refer to the instruction manual for your CNC for troubleshooting recommendations.
    D50 is illuminated.
    1. Remove the power from the cutting system.
    2. Remove the connector from J14 on the rear of the plasma power supply.
    3. Supply power to the cutting system.
    4. Continue with the next step.
  6. Examine D50 on PCB 1 again to find if it stays illuminated:
    If you see this condition...Do these steps...
    D50 is illuminated while the discrete cable stays disconnected.
    1. Examine the PCB for dust or other contaminants.
    2. Use compressed air to remove dust, debris, or obstructions, if found.
    3. If D50 stays illuminated with the discrete cable disconnected, there is a problem with the PCB. Speak to your cutting machine supplier.
    D50 is not illuminated.
    1. If the discrete cable has no visible damage, disconnect the cable from PCB 1.
    2. Look for an open circuit between pin 3 and pin 4 of J14.
    3. If the cable is good, make sure that the CNC output is set to OFF.
    4. If there is a short circuit, make sure that the discrete cable is not shorted and that the CNC start signal output is set to OFF. A closed circuit can be an indication that the CNC sent a plasma-start signal or that the discrete cable has damage.
    The diagnostic code goes away, but D50 is not illuminated while the discrete cable stays disconnected.
    1. Look for shorts across the line.
    2. Look for relays that are bad.
    3. Look for loose connections.
    4. Examine the discrete cable, and replace it if it has damage. Refer to Discrete interface cables.
  7. If you cannot find or correct the problem, speak to your cutting machine supplier or regional Hypertherm® Technical Service team.