Danfoss VLT FCM106, FCP 106 & FCM300 DriveMotor
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Feb 29, 2024 6:50 am
Cause : DC under voltage comes when the intermediate circuit voltage (DC link) drops below the under voltage limit or the DC-link voltage drops below the undervoltage limit, 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.
- Perform a soft charge circuit test.