ou3

ou3 fault in drive indicates Over voltage in constant speed comes when the inverter's internal main circuit DC voltage to reach or exceed the specified value.

Cause :  

Over voltage in constant speed comes when the inverter's internal main circuit DC voltage to reach or exceed the specified value.

Solutions: 

1. The protection circuit is activated to stop the inverter output.
2. The circuit may also be activated by a surge voltage produced in the power supply system.
3. Power supply abnormal.
4. Check the input power source.
5. Large load inertia.
6. Add suitable braking devices.