ABB DCS880 Drive
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Oct 01, 2024 11:29 am
7520 fault in ABB DCS880 drive indicates FBA B communication. This means cyclical communication between PLC and fieldbus adapter module B or between drive and fieldbus adapter module B is lost.
7520 FBA B communication is only activated after the first data set from the overriding control is received by the drive. Before the first data set is received, only A7C2 FBA B communication is active. The reason is to suppress unnecessary faults (the startup of the overriding control is usually slower than the one of the drive).
- Check the status of the fieldbus communication.
- Check the settings of group 50 Fieldbus adapter (FBA), 54 FBA B settings, 55 FBA B data in and 56 FBA B data out.
- Check the cable connections.
- Check the fieldbus termination.
- Check the fieldbus adapter.
- Check that the master is able to communicate.