ABB ACH550 Error 23: ENCODER ERR

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

Fault code23

ENCODER ERR means the drive cannot detect a valid encoder signal due to connection issues, logic level problems, or faulty encoder. The manual's first action is: “Check for and correct: • Encoder presence and proper connection (reverse wired, loose connection, or short circuit). • Voltage logic levels are outside of the specified range. • A working and properly connected Pulse Encoder Interface Module, OTAC-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 (ENABLED).”

Model
ABB ACH550
Display shows
ENCODER ERR (23)
Type
Fault code
Source
Manual p. 26

What 23 means

ENCODER ERR p. 26

Common causes

  • The drive is not detecting a valid encoder signal. p. 26

What to do

  1. Check for and correct: • Encoder presence and proper connection (reverse wired, loose connection, or short circuit). • Voltage logic levels are outside of the specified range. • A working and properly connected Pulse Encoder Interface Module, OTAC-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 (ENABLED). p. 26

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

If 23 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 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.