DC under voltage

What does ALARM 8 mean?

The DC-link voltage has dropped below the undervoltage limit. If no 24V DC back-up supply is connected, the frequency converter will trip after a fixed time delay (varying by unit size). This indicates insufficient input power, which can lead to uncontrolled motor shutdown.

Complete Troubleshooting Guide

1. 1

   Verify that the supply voltage matches the frequency converter's rated voltage.

2. 2

   Perform an input voltage test to confirm stable and correct supply.

3. 3

   Perform a soft-charge circuit test to ensure it's functioning correctly.