Cause : Over Voltage in Acceleration comes when the inverter's internal main circuit DC voltage to reach or exceed the specified value, the protection circuit is activated to stop the inverter output.

0u1 fault in fuji FRENIC MEGA drive Over Voltage in Acceleration. This means the DC bus voltage spiked while the motor was ramping up speed. It's less common than overvoltage during deceleration, but it’s still serious and needs attention.

1. Increase the acceleration time.
2. Check the input power source.