Alarm code4005
EXT COMM ERR occurs when fieldbus message timing exceeds timeout or communication settings are incorrect. The manual's first action is: “Check Group 51& 53 Tighten Connections Check Communication Cable Grounding”
- Model
- ABB ACH550
- Display shows
- EXT COMM ERR (4005)
- Type
- Alarm code
- Source
- Manual p. 72
What 4005 means
EXT COMM ERR p. 72
Common causes
- Time between fieldbus messages has exceeded timeout interval set with parameter 3005 p. 72
- Incorrect Communication settings in Group 51 & 53. p. 72
- Poor Connections p. 72
- Noise on Communication Line p. 72
What to do
- Check Group 51& 53 Tighten Connections Check Communication Cable Grounding p. 72
Before you service the product, read the safety instructions in the manual p. 2.
If 4005 is still not resolved
- contact the factory or your local Authorized Service Center for repair or replacement. p. 2 “Never attempt to repair a malfunctioning ACH550; contact the factory or your local Authorized Service Center for repair or replacement.”
This page summarises what the manufacturer’s manual says about 4005; 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 ABB. Found a mistake? Report an error.