MELSERVO MR-J2S- /L50132B Error 20: Encoder error 2

Servo amplifier and motor · taken from the manufacturer’s manual, pages cited

Fault code20

Encoder error 2 occurs from communication issues between the encoder and servo amplifier, or if the encoder is faulty or disconnected. The manual's first action is: “Connect correctly.”

Model
MELSERVO MR-J2S- /L50132B
Display shows
Encoder error 2 (20)
Type
Fault code
Source
Manual p. 108

What 20 means

Encoder error 2 p. 110

Common causes

  • Communication error occurred between encoder and servo amplifier. p. 110
  • 1. CN2 connector disconnected. p. 110
  • 2. Encoder fault p. 110
  • 3. Encoder cable faulty (Wire breakage or shorted). p. 110

What to do

  1. Connect correctly. p. 110
  2. Change the servo motor. p. 110
  3. Repair or change cable. p. 110

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

If 20 is still not resolved

  • contact service / dealer p. 2
    “Do not attempt to install, operate, maintain or inspect the servo amplifier and servo motor until you have read through this Instruction Manual, Installation guide, Servo motor Instruction Manual and appended documents carefully and can use the equipment correctly.”
  • contact service / dealer p. 3
    “Any person who is involved in wiring and inspection should be fully competent to do the work.”
Open the manual at page 108 All MR-J2S- /L50132B error codes Manual details & download

This page summarises what the manufacturer’s manual says about 20; 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 MELSERVO. Found a mistake? Report an error.