ABB ACS550-01 / ACS550-U1 Error 23: ENCODER ERR

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

Fault code23

The drive is not detecting a valid encoder signal. The manual's first action is: “Check for and correct: • Encoder presence and proper connection (reverse wired = channel A connected to terminal of channel B or vice versa, loose connection or short circuit). • Voltage logic levels are outside of the specified range. • A working and properly connected Pulse Encoder Interface Module, O_TAC-01. • Wrong value entered in parameter 5001 PULSE NR. A wrong value will only be detected if the error is such that the calculated slip is greater than 4 times the rated slip of the motor. • Encoder is not being used, but parameter 5002 ENCODER ENABLE = 1 (ENABLE).”

Model
ABB ACS550-01 / ACS550-U1
Display shows
ENCODER ERR (23)
Type
Fault code
Source
Manual p. 245

What 23 means

ENCODER ERR p. 263

Common causes

  • The drive is not detecting a valid encoder signal. p. 263

What to do

  1. Check for and correct: • Encoder presence and proper connection (reverse wired = channel A connected to terminal of channel B or vice versa, loose connection or short circuit). • Voltage logic levels are outside of the specified range. • A working and properly connected Pulse Encoder Interface Module, O_TAC-01. • Wrong value entered in parameter 5001 PULSE NR. A wrong value will only be detected if the error is such that the calculated slip is greater than 4 times the rated slip of the motor. • Encoder is not being used, but parameter 5002 ENCODER ENABLE = 1 (ENABLE). p. 263

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

If 23 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 23; 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.