Cause : VDC RIPPLE comes when the dc link ripple voltage is too high. Ripple refers to the AC component superimposed on the DC voltage, which can affect the drive's performance and reliability.

VDC RIPPLE fault in parker AC690 drive indicates that there is excessive ripple in the DC voltage supply to the drive.

Possible Causes and Solutions:

1. Power Supply Issues:

   • Cause: Problems with the external power supply, such as instability or noise, can introduce ripple into the DC voltage.
   • Solution:
     • Check power supply: Ensure that the power supply providing the DC voltage to the drive is stable and within the specified range. Address any issues with power supply stability or noise.

2. Filter or Capacitor Problems:

   • Cause: The drive may rely on internal or external filters and capacitors to smooth out the DC voltage. If these components are faulty or not functioning properly, excessive ripple can occur.
   • Solution:
     • Inspect filters and capacitors: Check any filters and capacitors associated with the drive’s DC voltage supply. Replace any faulty or degraded components.

3. Inverter or Rectifier Issues:

   • Cause: Problems with the inverter or rectifier circuits that convert AC to DC power can cause excessive ripple.
   • Solution:
     • Check inverter and rectifier: Inspect the inverter and rectifier components for any faults or issues. Repair or replace components as needed.

4. Harmonics and Electrical Noise:

   • Cause: Harmonics or electrical noise in the system can cause ripple in the DC voltage.
   • Solution:
     • Mitigate noise: Use filters or other noise suppression techniques to reduce electrical noise and harmonics in the system. Ensure that all grounding and shielding practices are properly followed.

5. Load Issues:

   • Cause: Excessive load or fluctuations in the load connected to the drive can cause variations in the DC voltage and introduce ripple.
   • Solution:
     • Review load conditions: Check the load connected to the drive to ensure it is within the rated capacity and operating normally. Address any issues with load fluctuations or excessive demand.

6. Drive Internal Faults:

   • Cause: Internal faults within the drive, such as issues with internal power conversion circuits, can cause a VDC RIPPLE fault.
   • Solution:
     • Inspect the drive: If external causes have been ruled out, consider inspecting the drive for internal faults.