Alarm codeEr-3
CPU error occurs when high-intensity noise interferes with the inverter's central processing unit. The manual's first action is: “Check if appropriate noise control measures have been implemented (e.g., correct grounding and routing of control and main circuit wires). → Improve noise control.”
- Model
- Fuji Electric FRENIC-Mini
- Display shows
- CPU error (Er-3)
- Type
- Alarm code
- Source
- Manual p. 147
What Er-3 means
CPU error p. 147
Common causes
- (1) A high intensity noise was given to the inverter. p. 147
What to do
- Check if appropriate noise control measures have been implemented (e.g., correct grounding and routing of control and main circuit wires). → Improve noise control. p. 147
Before you service the product, read the safety instructions in the manual p. 4.
If Er-3 is still not resolved
- Contact service / dealer p. 4 “ii Safety precautions Read this manual thoroughly before proceeding with installation, connections (wiring), operation, or maintenance and inspection.”
- Contact service / dealer p. 29 “CAUTION: When wiring the inverter to the power supply of 500 kVA or more (50 kVA or more for the single-phase 115 V class series of inverters), be sure to connect an optional DC reactor (DCR).”
This page summarises what the manufacturer’s manual says about Er-3; 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.