Cause : OVER VOLTAGE comes when the input voltage to the drive is exceeding its rated operating voltage. This can lead to various problems, including damage to the drive's components, overheating, and reduced performance.

Overvoltage fault in Parker AC690 drive indicates that the voltage level on the DC bus has exceeded the drive's rated threshold. This can occur due to various reasons, such as regenerative braking, power supply issues, or problems with the drive’s internal components.

Possible Causes and Solutions:

1. Regenerative Braking:

   • Cause: During deceleration, the motor can act as a generator, feeding energy back into the drive, which increases the DC bus voltage.
   • Solution:
     • Check if the drive is decelerating too quickly: Adjust the deceleration ramp time in the drive’s parameters to allow for a longer deceleration time.
     • Install a braking resistor: If the application involves frequent or heavy decelerations, a braking resistor can absorb excess energy and prevent overvoltage.

2. High Input Voltage:

   • Cause: The incoming AC supply voltage might be higher than the drive’s rated input voltage.
   • Solution:
     • Measure the incoming voltage: Ensure that the supply voltage is within the acceptable range specified in the drive's manual.
     • Install a line reactor or a transformer: If the supply voltage is consistently high, consider installing a line reactor or step-down transformer to reduce the voltage.

3. Power Supply Fluctuations:

   • Cause: Sudden spikes or surges in the power supply can lead to overvoltage on the DC bus.
   • Solution:
     • Check for power quality issues: Use a power quality analyzer to detect any voltage spikes or surges.
     • Install surge protection: If power quality is an issue, consider adding surge protection devices.

4. Incorrect Drive Settings:

   • Cause: Incorrect configuration of drive parameters, such as the motor voltage, can lead to an overvoltage fault.
   • Solution:
     • Verify drive settings: Ensure that the motor voltage and other related parameters are correctly configured in the drive.

5. Drive Internal Fault:

   • Cause: There could be an internal fault within the drive, such as a malfunctioning capacitor or other components.
   • Solution:
     • Inspect the drive for internal issues: If all external factors have been ruled out, there may be an internal hardware issue. This would require technical support from Parker or drive replacement.

6. Poor Grounding or Noise Interference:

   • Cause: Improper grounding or electrical noise can sometimes contribute to voltage irregularities.
   • Solution:
     • Check grounding and shielding: Ensure the drive and motor are properly grounded and that cables are adequately shielded against electrical noise.