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What does the triangle LED on the ATV320 drives indicate?

Customer sees the triangular LED is on.  Wants to confrim what this indicates.

Product line:
Altivar Machine ATV320 Altivar 320



When the triangle LED is on, the Drive is in a Fault condition.  Check the display for the fault code to troubleshoot. 
The LED goes off when the fault is cleared and the drive has been reset.
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