Inverter Fault Light

Symptom

The inverter fault light occurs only after a specific power level is obtained.

Fault

This type of fault is caused by a high voltage short in the output load. To isolate this fault, proceed with the troubleshooting section for a High Voltage Trip.

Symptom

The inverter fault light occurs immediately on starting the power supply regardless of the desired power level.

Fault

The DC to AC inverter section of the power supply has a fault. This could be a defective device, a defective driver board or both.

Caution

When a defective device is replaced, ensure the associated gate leads are replaced also. If not, the leads may result in additional device failures.

Solution

1. Check the chopper and inverter devices in accordance with the device checks on page 2. (Item 14 & 15).
   1. If defective devices are identified, replace both the device and the leads.
   2. If no defective devices are identified, proceed.
2. Disconnect the output leads from the power supply to the high voltage transformer. Restart the power supply and check the symptoms.
   1. If the inverter fault occurs, replace the driver board (Item 11).
   2. If no inverter fault proceed to troubleshoot a High Voltage Trip fault