Video: What causes an INF6 fault on the ATV61 and ATV71 drives?
Troubleshooting INF6 Fault on Altivar 61 & 71 Drives
Altivar ATV61 and ATV71
The control terminal card may be loose or there may be 2 serial communication cards installed at once.
INF6 is an internal option fault. Basically, the option card installed on the VFD is not recognized.
First, re-seat the control terminal card. Then, check the 1.11 Identification menu for option 1 and option 2 to see if there are 2 conflicting option cards installed.