Mitsubishi Electric MR-J2S-A Error AL.52: Error excessive

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

Alarm codeAL.52

Error excessive occurs when acceleration/deceleration time is too short, torque limit is too low, or motor fails to start due to voltage drop. The manual's first action is: “Power OFF→ON”

Model
Mitsubishi Electric MR-J2S-A
Display shows
Error excessive (AL.52)
Type
Alarm code
Source
Manual p. 69

What AL.52 means

Error excessive p. 200

Common causes

  • 1. Acceleration/deceleration time constant is too small. p. 200
  • 2. Torque limit value (parameter No.28) is too small. p. 200
  • 3. Motor cannot be started due to torque shortage caused by power supply voltage drop. p. 200
  • 4. Position control gain 1 (parameter No.6) value is small. p. 200
  • 5. Servo motor shaft was rotated by external force. p. 200
  • 6. Machine struck something. p. 200
  • 7. Encoder faulty p. 200
  • 8. Wrong connection of servo motor. Servo amplifier's output terminals U, V, W do not match servo motor's input terminals U, V, W. p. 200

What to do

  1. Power OFF→ON p. 200
  2. Press "SET" on current alarm screen. p. 200
  3. Alarm reset (RES) p. 200
  4. Increase the acceleration/deceleration time constant. p. 200
  5. Increase the torque limit value. p. 200
  6. 1. Review the power supply capacity. 2. Use servo motor which provides larger output. p. 200
  7. Increase set value and adjust to ensure proper operation. p. 200
  8. 1. When torque is limited, increase the limit value. 2. Reduce load. 3. Use servo motor that provides larger output. p. 200
  9. 1. Review operation pattern. 2. Install limit switches. p. 200
  10. Change the servo motor. p. 200
  11. Connect correctly. p. 200

Before you service the product, read the safety instructions in the manual p. 3.

If AL.52 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.”
Open the manual at page 69 All MR-J2S-A error codes Manual details & download

This page summarises what the manufacturer’s manual says about AL.52; 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.