Troubleshooting for missing gas input faults

The Gas Pressure fault Light Emitting Diode (LED) flashes quickly when there is no gas supply input to the plasma power supply.

Fault codes and fault LEDs

Fault code Fault LEDs Torch LED Description Stops the system from operating?
None The image shows the Gas Pressure fault Light Emitting Diode flashing.

Flashes quickly

 The image shows the torch Light Emitting Diode illuminated yellow.

Yellow

 There is no gas supply input. Yes. The fault code goes away when you connect the gas supply to the plasma power supply unless there is a blockage in the gas line.

Corrective action for the input gas supply

  1. Make sure that the input gas supply is connected correctly to the plasma power supply.
  2. Examine the input gas supply line, and make sure that there are no gas leaks, loose connections, or blockages.
  3. Do a quick restart.

Corrective action for the solenoid valve and power PCB

  1. Set the power switch to OFF (O), disconnect the power cord from the power source, and disconnect the gas supply.
  2. Remove the plasma power supply handle and cover.
  3. Set the power switch to ON (I).
  4. With the gas disconnected and the plasma power supply ON, can you hear the solenoid valve make a click? OptionDescription
    If yes...
    1. Examine the gas hoses that connect to the solenoid valve.
    2. Replace the hoses if they have kinks or other damage.
    3. Reconnect the input gas supply to the plasma power supply.
    4. Set the power switch to ON (I).
    5. Fire the torch.
    If no... Continue with the next step.
    The image shows the two gas hoses that connect to the solenoid valve.
    1 Solenoid valve
    2 Gas hoses
  5. Measure the voltage between pin 1 and pin 7 at J8 on the power Printed Circuit Board (PCB).
  6. Is the voltage approximately 48 VDC? OptionDescription
    If yes... Continue with the next step.
    If no... Continue with step 11.
    The image shows the J8 pins on the power Printed Circuit Board.
  7. Put the test leads on pin 7 and pin 8 at J8.
  8. Do a cold restart.
  9. Hold the test leads in position for approximately 3 – 5 seconds after the restart.
  10. Was there a large increase in voltage after you did the restart? OptionDescription
    If yes... Replace the solenoid valve.
    If no... Replace the power PCB.
  11. Disconnect the J8 connector from the power PCB.
  12. Measure the voltage again between pin 1 and pin 7 at J8.
  13. Is the voltage approximately 48 VDC? OptionDescription
    If yes... Continue with the next step.
    If no... Replace the power PCB.
  14. Do a resistance check to make sure that the solenoid valve is defective:
    1. Measure the resistance between pin 7 and pin 8 on the J8 connector.
    2. If the resistance is less than 44 ohms (Ω), ±5 ohms (Ω), replace the solenoid valve.
      The image shows pin 7 and pin 8 on the J8 connector on the solenoid valve.