Cause : Switching Supply fault comes when the internal power supplies of the control electronics are monitored, if one is out of range the INF8 error is triggered.

"INF8" in Schneider ATV950 drive signifies an "Internal Power Supply Fault". This fault code indicates the drive is detecting an issue with its internal power supply that provides voltage to various internal components.

Steps to Address a Internal Power Supply Fault in Schneider Drive:

1. Immediate Actions:

   • Stop Operation: If the drive is running, stop it immediately to prevent any potential damage or unsafe conditions.
   • Power Off: Turn off the power to the drive to prevent further issues.

2. Verify the Fault:

   • Symptom Check: Confirm that the symptoms match those commonly associated with a faulty SMPS (e.g., the drive not powering on, intermittent power, unusual noises, or visible damage to the power supply unit).
   • Error Codes: Check if there are any error codes displayed on the drive's control panel that might indicate a power supply issue.

3. Inspect the SMPS:

   • Visual Inspection: Open the drive enclosure (if you are qualified and it is safe to do so) and inspect the SMPS for any obvious signs of damage, such as burnt components, bulging capacitors, or loose connections.
   • Smell: Sometimes a burnt smell can indicate a damaged component in the SMPS.

4. Test the SMPS:

   • Multimeter Check: Use a multimeter to check the output voltages of the SMPS. Ensure they match the specifications listed in the drive’s documentation.
   • Component Testing: If you have the expertise, test individual components within the SMPS (e.g., diodes, transistors, capacitors) to identify any faulty parts.

5. Replace the SMPS:

   • Replacement Part: If the SMPS is confirmed to be faulty, obtain a replacement from Schneider Electric or an authorized distributor.
   • Installation: Carefully replace the faulty SMPS with the new unit, ensuring all connections are secure and correct.

6. Verify Drive Operation:

   • Power On: Turn the power back on and monitor the drive for proper operation.
   • Test Functions: Test the drive's various functions to ensure that the issue has been resolved and the drive operates normally.

7. Preventive Measures:

   • Cooling: Ensure that the drive's cooling system is functioning properly to prevent overheating, which can damage the SMPS.
   • Surge Protection: Use surge protectors to protect the drive from power surges and voltage spikes that could damage the SMPS.