ABB ACS550-01 / ACS550-U1 Error 28: SERIAL 1 ERR

ACS550-01/U1 drive · taken from the manufacturer’s manual, pages cited

Fault code28

Fieldbus communication has timed out. 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: EXT COMM MODULE or Group 53: EFB PROTOCOL as appropriate). • Poor connections and/or noise on line.”

Model
ABB ACS550-01 / ACS550-U1
Display shows
SERIAL 1 ERR (28)
Type
Fault code
Source
Manual p. 246

What 28 means

SERIAL 1 ERR p. 263

Common causes

  • Fieldbus communication has timed out. p. 263

What to do

  1. Check for and correct: • Fault setup (3018 COMM FAULT FUNC and 3019 COMM FAULT TIME). • Communication settings (Group 51: EXT COMM MODULE or Group 53: EFB PROTOCOL as appropriate). • Poor connections and/or noise on line. p. 263

Before you service the product, read the safety instructions in the manual p. 6.

If 28 is still not resolved

  • contact your local ABB representative for replacement p. 6
    “Never attempt to repair a malfunctioning drive; contact your local ABB representative for replacement.”
  • For more technical information, contact your local ABB representative. p. 7
    “For more technical information, contact your local ABB representative.”
Open the manual at page 246 All ACS550-01 / ACS550-U1 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.