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What are the possible causes of INF3 fault in Altivar 71 Drive.

The INF3  fault can be cause by
  1. A short circuit on the Modbus connector between the 0V (pin 8 on Modbus connector) and the VP (pin 7 on the Modbus connector).
  2. Malfunction of an internal component.
     Refer the attached file for more details.
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