Overvoltage protection has been triggered. The manual's first action is: “The inverter stops the inverter output upon detection of an overvoltage condition (400 VDC for 3-phase 200V, 800 VDC for 3-phase 400V series) in the DC link bus. This protection is not assured if extremely large AC line voltage is applied inadvertently.”
- Model
- Fuji Electric FRENIC-Eco
- Display shows
- Overvoltage protection (OU3)
- Type
- Alarm code
- Source
- Manual p. 205
What OU3 means
Overvoltage protection p. 205
Common causes
- During running at constant speed (Stopped) p. 205
What to do
- The inverter stops the inverter output upon detection of an overvoltage condition (400 VDC for 3-phase 200V, 800 VDC for 3-phase 400V series) in the DC link bus. This protection is not assured if extremely large AC line voltage is applied inadvertently. p. 205
If OU3 is still not resolved
The manual gives no further instruction for this code. Open the code table in the PDF or contact Fuji Electric service.
This page summarises what the manufacturer’s manual says about OU3; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Fuji Electric. Found a mistake? Report an error.