The plasma arc goes out while you are cutting, or the torch will intermittently not fire

The work lead is defective or the work lead connection is insufficient for some reason

  1. If possible, move the work clamp closer to the area of the workpiece you are cutting.
  2. Clean the area where the work clamp comes into contact with the workpiece or cutting table, and remove rust, paint, or other residue.
  3. Make sure that the cutting table is correctly grounded and has good contact with the workpiece.
  4. Examine the work lead for a loose connection at the plasma power supply and at the work clamp.
  5. Examine the work clamp, and repair or replace the clamp if necessary.
  6. Examine the work lead, and repair or replace the lead if necessary.

The fan is defective

  1. Do Corrective action for the power PCB voltage to find if the voltage for the fan is in the correct range.
  2. Clean the fan assembly.
  3. Make sure that the J7 fan connector is fully connected to the power Printed Circuit Board (PCB).
  4. Make sure that the fan wires are not pinched and do not have damage.
  5. Remove the fan and fan shroud from the plasma power supply.
  6. Use pin 1 (red) and pin 4 (black) on the J7 fan connector, and connect the fan to an external 12 V or 24 V power source.
    The image shows the pins on the fan connector to connect to a power source.
  7. Does the fan operate correctly when it is connected to an external power source? OptionDescription
    If yes... Replace the power PCB.
    If no... Replace the fan.