What will cause the E-FLEX drive to fault on HMI comm's fault after running in hand mode for a certain period to time?

Issue:
E-FLEX drive causes to fault on HMI comm's fault after running in hand mode for a certain period to time.

Product Line:
E-FLEX ATV61 Enclosed VFD


Resolution :
In an E-FLEX in hand mode the ATV61 uses the HMI for the speed reference signal.   If the Display standby mode is enabled, the keypad will shut down after the a specified period of time.  When the keypad shuts down, the drive looses the frequency reference that is set by the HMI causing an HMI fault on the VFD.   When the ATV61 is used in an E-FLEX, the standby function should not be enabled.

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