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What can cause a SLF3 fault on the Altivar Process Drive?

Published date: 21 January 2019

 Issue:
SLF3 fault on the Altivar Process Drive

Product Line:
ATV630 ATV930

Environment:
All serial numbers

Cause:
Customer said SLF3 fault appeared on the keypad or HMI.

Resolution:
This is a communication fault with the graphical keypad.  This fault can only occur when the start command or the speed reference is processed by the graphical keypad (HMI).  If the communication is interrupted for short time (2s), the trip message will be displayed.
Check the connection of graphical keypad.
Verify the cable length does not exceed 20m or 65 ft.
If graphical keypad is disconnected, reconnect the keypad and power cycle the drive to clear the fault.

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