ABB ACS550-01 / ACS550-U1 Error 7: AI1 LOSS

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

Fault code7

AI1 LOSS occurs when analog input 1 value falls below A1 FAULT LIMIT (3021). The manual's first action is: “Check for and correct: • Source and connection for analog input. • Parameter settings for A1 FAULT LIMIT (3021) and 3001 AI

Model
ABB ACS550-01 / ACS550-U1
Display shows
AI1 LOSS (7)
Type
Fault code
Source
Manual p. 245

What 7 means

AI1 LOSS p. 261

Common causes

  • Analog input 1 loss. Analog input value is less than A1 FAULT LIMIT (3021). p. 261

What to do

  1. Check for and correct: • Source and connection for analog input. • Parameter settings for A1 FAULT LIMIT (3021) and 3001 AI p. 261

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

If 7 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 245 All ACS550-01 / ACS550-U1 error codes Manual details & download

This page summarises what the manufacturer’s manual says about 7; 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.