Cause : Input voltage exception comes when the voltage of the incoming power supply is outside the acceptable range specified for the drive.

"E12.04" fault in inovance MD800 drive indicate "input voltage exception". This means the drive detects that the input voltage is either too high or too low, which can affect its performance and reliability.

Possible Causes:

1. Voltage Fluctuations: Variations or fluctuations in the power supply voltage can trigger this fault.
2. Power Supply Issues: Issues such as brownouts, surges, or unstable power sources can cause input voltage to deviate from the acceptable range.
3. Incorrect Input Voltage Settings: The drive may have incorrect settings for the input voltage range, leading to false fault detection.
4. Wiring Problems: Loose, damaged, or incorrect wiring connections between the power supply and the drive can cause voltage discrepancies.
5. Faulty Components: Internal components of the drive, such as voltage sensors or input circuits, may be malfunctioning and causing incorrect voltage readings.

Troubleshooting Steps:

1. Check Power Supply Voltage:

   • Measure Voltage Levels: Use a voltmeter to measure the incoming power supply voltage. Compare the measured voltage with the specifications listed in the drive’s manual.
   • Verify Voltage Stability: Ensure that the power supply is stable and free from fluctuations, surges, or dips. If there are issues with the power supply, address them to stabilize the voltage.

2. Inspect Wiring and Connections:

   • Check Wiring Integrity: Inspect all wiring between the power supply and the drive for damage, loose connections, or incorrect wiring. Tighten any loose connections and replace damaged wires.
   • Verify Proper Wiring: Ensure that the wiring is correctly installed according to the drive’s wiring diagram and specifications.

3. Review and Adjust Drive Settings:

   • Check Input Voltage Settings: Verify that the drive’s input voltage settings are correctly configured for the power supply voltage range being used.
   • Adjust Settings if Needed: If the settings are incorrect, adjust them to match the actual input voltage range.

4. Monitor Power Supply Conditions:

   • Check for Voltage Spikes or Drops: Use a power quality analyzer to check for any voltage spikes, drops, or other anomalies in the power supply.
   • Consider Power Conditioning: If voltage instability is detected, consider using a voltage stabilizer, line reactor, or UPS to provide a stable power supply to the drive.

5. Inspect Internal Drive Components:

   • Check Voltage Sensors: If accessible, inspect the drive’s internal voltage sensors or input circuits for faults or inaccuracies.
   • Perform Diagnostic Tests: Use the drive’s diagnostic tools to test for internal faults related to voltage measurement.