Alarm codeAL.10
Undervoltage occurs when supply voltage drops below 160VAC (or 83VAC for MR-J2S-□A1), or if a prolonged control power failure occurred. The manual's first action is: “Power OFF→ON”
- Model
- Mitsubishi Electric MR-J2S-A
- Display shows
- Undervoltage (AL.10)
- Type
- Alarm code
- Source
- Manual p. 69
What AL.10 means
Undervoltage p. 200
Common causes
- Power supply voltage dropped. MR-J2S-□A: 160VAC or less MR-J2S-□A1: 83VAC or less p. 200
- 1. Power supply voltage is low. p. 200
- 2. There was an instantaneous control power failure of 60ms or longer. p. 200
- 3. Shortage of power supply capacity caused the power supply voltage to drop at start, etc. p. 200
- 4. The bus voltage dropped to 200VDC. p. 200
- 5. Faulty parts in the servo amplifier p. 200
- Checking method Alarm (AL.10) occurs if power is switched on after disconnection of all cables but the control circuit power supply cables. p. 200
What to do
- Power OFF→ON p. 200
- Press "SET" on current alarm screen. p. 200
- Alarm reset (RES) p. 200
- Review the power supply. p. 200
- Change the servo amplifier. p. 200
Before you service the product, read the safety instructions in the manual p. 3.
If AL.10 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.10; 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.