Mitsubishi Electric AL.51

Brand: Mitsubishi ElectricModel: PLC (FX5U / iQ-R / iQ-F Series)Error code: AL.51

What the Fault Means

Overload (motor)

Likely causes

  • Motor I²t model exceeded

Solution and Safe First Checks

  1. Same as AL.50 — reduce load; check motor selection

Safety: do not work inside the panel without isolating the power; if unsure, consult a qualified technician.

Related Mitsubishi Electric error codes

Source: the Zeror.ai industrial fault database and Mitsubishi Electric technical documentation. This page is for information; on critical systems follow the manufacturer's manual and authorised service.