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What causes an HMI COM FAULT on an ATV61 or ATV71 series drive?

Issue:
What causes an HMI COM FAULT on an ATV61 or ATV71 series drive?

Product Line:
ATV61 / ATV71 series drives

Environment:
Where the HMI keypad is being used to control the start/stop of the drive and/or the speed reference: All models, All serial numbers.

Cause:
Customer unable to find the answer in existing literature

Resolution:
HMI Com fault is caused when the HMI loses communication with the drive.   The HMI module of the ATV61/ATV71 series drives establishes a Modbus RTU connection at power up with the HMI being the Modbus Master.  This connection is separate from the Modbus/Canopen channel and is isolated.  This fault can only occur when the drive is configured to receive the start/stop control and/or the speed reference from the keypad.  When this fault occurs, the most common cause is either a failure of the HMI itself (part# VW3A1101) or if the keypad is mounted remotely, the cable connecting it to the drive (VW3A1104RXX where XX = 10 for 1 meter cable, 30 for 3 meter, 50 for 5 meter or 100 for 10 meter) has failed.
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