CrF

Precharge Fault

Schneider Electric · Altivar 312 Variable Frequency Drive

What does CrF mean?

This fault indicates a problem with the drive's internal capacitor precharge circuit, typically related to the precharge relay control or a damaged precharge resistor. The precharge circuit is vital for safely charging the DC bus capacitors upon power-up. If unresolved, the drive cannot power up correctly and will remain inoperable.

Complete Troubleshooting Guide

  1. 1

    Check the incoming power supply for stability and correct voltage levels.

  2. 2

    As this is an internal component fault, replacing the drive is typically the required remedy.

Source: Schneider Electric Manual