Undervoltage

What does 9 mean?

The DC-link voltage has fallen below its defined limits. This is most commonly caused by a low supply voltage, a temporary supply voltage break, a defect in an input fuse, or an external charge switch not being closed. Persistent undervoltage can cause erratic drive behavior or prevent it from starting.

Complete Troubleshooting Guide

1. 1

   In case of a temporary supply voltage break, reset the fault and restart the frequency converter.

2. 2

   Check the main supply voltage to ensure it is within specified limits.

3. 3

   Inspect input fuses for continuity and proper rating.

4. 4

   Verify the state of any external charge switches.

5. 5

   If supply voltage is adequate and the problem persists, an internal failure may have occurred – contact the distributor.