Alarm codeAL.20
Encoder error 2 happens when the encoder connector is disconnected, the encoder cable is broken or shorted, or the encoder is faulty. The manual's first action is: “Power OFF→ON”
- Model
- Mitsubishi Electric MR-J2S-A
- Display shows
- Encoder error 2 (AL.20)
- Type
- Alarm code
- Source
- Manual p. 69
What AL.20 means
Encoder error 2 p. 200
Common causes
- 1. Encoder connector (CN2) disconnected. p. 200
- 2. Encoder cable faulty (Wire breakage or shorted) p. 200
- 3. Encoder fault p. 200
What to do
- Power OFF→ON p. 200
- Press "SET" on current alarm screen. p. 200
- Alarm reset (RES) p. 200
- Connect correctly. p. 200
- Repair or change the cable. p. 200
- Change the servo motor. p. 200
Before you service the product, read the safety instructions in the manual p. 3.
If AL.20 is still not resolved
- contact service / dealer p. 3 “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. 4 “Do not attempt to wire the servo amplifier and servo motor until they have been installed. Otherwise, you may get an electric shock.”
This page summarises what the manufacturer’s manual says about AL.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 Mitsubishi Electric. Found a mistake? Report an error.