ABB ACS550-01 / ACS550-U1 Error 2021: START ENABLE 1 MISSING

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

Alarm code2021

This alarm warns that the Start Enable 1 signal is missing. The manual's first action is: “To correct, check: • Digital input configuration. • Communication settings.”

Model
ABB ACS550-01 / ACS550-U1
Display shows
START ENABLE 1 MISSING (2021)
Type
Alarm code
Source
Manual p. 268

What 2021 means

START ENABLE 1 MISSING p. 268

Common causes

  • This alarm warns that the Start Enable 1 signal is missing. p. 268

What to do

  1. To correct, check: • Digital input configuration. • Communication settings. p. 268

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

If 2021 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 268 All ACS550-01 / ACS550-U1 error codes Manual details & download

This page summarises what the manufacturer’s manual says about 2021; 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.