Cause : Power supply unit fault comes when an issue with the power supply system that provides electrical power to the drive. This fault can impact the drive’s ability to operate correctly and may cause a range of operational issues.

"E25.00" fault in inovance MD800 drive "Power supply unit fault". This means there is an hardware issue in drive power supply card.

Possible Causes:

1. Input Power Issues: Problems with the incoming AC power supply, such as voltage drops, surges, or fluctuations.
2. Internal PSU Component Failure: Failure of internal components within the PSU, such as capacitors, transformers, or voltage regulators.
3. Wiring and Connections: Loose or damaged wiring and connections within the power supply or between the PSU and the drive.
4. Overload Conditions: The PSU may be overloaded or unable to supply sufficient power to the drive and its components.
5. Cooling Problems: Inadequate cooling or ventilation around the PSU can lead to overheating and malfunction.

Troubleshooting Steps:

1. Verify Input Power:

   • Check Voltage Levels: Measure the input voltage to the PSU to ensure it is within the specified range for the drive.
   • Inspect Power Supply: Verify that the incoming AC power supply is stable and free from significant fluctuations or surges.

2. Inspect Internal PSU Components:

   • Check for Damage: Examine the PSU for any visible signs of damage or overheating, such as burnt components or leaking capacitors.
   • Test Output Voltages: Measure the output voltages of the PSU to ensure they are within the correct range as specified in the drive’s documentation.

3. Examine Wiring and Connections:

   • Inspect Wiring: Check all wiring connections to and from the PSU for signs of damage, loose connections, or incorrect installation.
   • Verify Connections: Ensure that all connections are secure and properly made.

4. Assess Overload Conditions:

   • Check Load: Verify that the drive is not experiencing conditions that might overload the PSU, such as excessive current draw or short circuits.
   • Monitor Performance: Observe the drive’s performance to see if it operates normally under different load conditions.

5. Inspect Cooling and Ventilation:

   • Check Cooling: Ensure that the PSU and drive have adequate cooling and ventilation. Clean or replace any cooling fans if necessary.
   • Verify Airflow: Ensure that air vents and cooling paths are unobstructed and functioning properly.