Danfoss VLT FC 280 Midi Drive
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Feb 24, 2024 5:12 am
Cause : DC under voltage comes when the intermediate circuit voltage (DC link) drops below the under voltage limit, the frequency converter checks if a 24 V DC back-up supply is connected.
- If no 24 V DC back- up supply is connected, the frequency converter trips after a fixed time delay.
- The time delay varies with unit size.
- Check that the supply voltage matches the frequency converter voltage.
- Perform an input voltage test.
