ABB ACH550 Error 28: SERIAL 1 ERR

AC drive · taken from the manufacturer’s manual, pages cited

Fault code28

SERIAL 1 ERR means fieldbus communication has timed out due to setup, settings, or line issues. The manual's first action is: “Check for and correct: • Fault setup (3018 COMM FAULT FUNC and 3019 COMM FAULT TIME). • Communication settings (Group 51 or 53 as appropriate). • Poor connections and/or noise on line.”

Model
ABB ACH550
Display shows
SERIAL 1 ERR (28)
Type
Fault code
Source
Manual p. 26

What 28 means

SERIAL 1 ERR p. 26

Common causes

  • Fieldbus communication has timed out. p. 26

What to do

  1. Check for and correct: • Fault setup (3018 COMM FAULT FUNC and 3019 COMM FAULT TIME). • Communication settings (Group 51 or 53 as appropriate). • Poor connections and/or noise on line. p. 26

Before you service the product, read the safety instructions in the manual p. 2.

If 28 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.”
Open the manual at page 26 All ACH550 error codes Manual details & download

This page summarises what the manufacturer’s manual says about 28; 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.