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F0007 AI1 LOSS fault in ABB ACS150

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How can resolve problem F0007 AI1 LOSS fault in ABB ACS150 ?

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Cause : Analog input AI1 signal has fallen below limit defined by parameter 3021 AI1 FAULT LIMIT.

1. Programmable fault function,

parameters 3001 AI<MIN FUNCTION, 3021 AI1 FAULT LIMIT.

2. Check fault function parameter settings.

3. Check for proper analog control signal levels.

4. Check connections.

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