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What can cause a SLF2 fault on the Altivar Process Drive?

Issue:
What can cause a SLF2 fault on the Altivar Process Drive?

Product Line:
ATV630 ATV930

Environment:
All serial numbers

Cause:
Customer said drive displayed SLF2 on HMI.

Resolution:
This fault can occur only when the start command or the speed reference is processed by Modbus protocol.  This can be caused by interruption of communication on the modbus.  
Check the connection cable.
Check parameter ADD ? Modbus address.
Check parameter TBR ? Modbus baud rate.
Check parameter TFO ? Modbus format.
Check parameter TTO ? Modbus time-out
Check parameter NTO (bit of parameter CMI).  
Power cycle drive to reset fault.
 
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