Danfoss VACON NXS Series Operating Manual page 233

Specifications
Operating Guide | VACON® NXS/NXP Air-cooled
Troubleshooting
Remove fault situation on active filter.
12.10.137 Fault 74 - Follower fault
Cause
When using normal Master Follower function this fault code is given if one or more follower drives trips to fault.
Troubleshooting
Correct the fault cause on follower and reset fault.
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