CPU A/D Converter Fault

What does CPF5 mean?

This fault indicates an internal malfunction within the inverter's CPU, specifically related to its Analog-to-Digital (A/D) converter. It suggests a problem with the inverter's ability to accurately read analog signals, which is critical for its control functions. Input phase loss detection is disabled under this condition.

Complete Troubleshooting Guide

1. 1

   Perform a power cycle of the inverter (turn off main power, wait for DC bus discharge, then reapply power) to attempt a soft reset of the CPU.

2. 2

   Check the inverter's operating environment for extreme temperatures, high humidity, or excessive electromagnetic interference that could affect internal electronics.

3. 3

   If the fault persists after a power cycle, the A/D converter or the CPU board itself may be damaged.

4. 4

   Contact Yaskawa technical support or a certified service center for further diagnostics or potential control board replacement.