CPU Fault

What does E.CPU mean?

The inverter output is shut off due to a communication fault within the built-in CPU, potentially indicated by specific sub-faults (E.5, E.6, E.7 on FR-LU08). This can be triggered by excessive electrical noise in the environment or an improper connection of an Ethernet communication cable. An internal CPU fault can render the inverter inoperable.

Complete Troubleshooting Guide

1. 1

   Assess the environment for devices producing excessive electrical noise and implement appropriate noise suppression measures.

2. 2

   If Ethernet communication is used, ensure the communication cable is securely connected and undamaged.

3. 3

   If the issue persists after addressing noise and cable connections, contact your sales representative.