Input KWH reading going in reverse direction

Hi

One of our WCIII VFDs reading input KWH in reverse direction. Only difference between this VFD and other VFDs is that drive efficiency is showing 100%  unlike other VFDs where it is showing 99.4 % or 99.6%

Our monthly reading is being noted down by power consumption group and found as below. How to get the correct reading

Thanks

N Vijay

Yes Will4 , it is showing -ve value -59.9 Hz

See the attachment

Regards,

Naga

Thanks again , let me further dig when it got reversed, as I had snapshots before 1 year showing correct value of input frequency on the same drive. I will update you soon

Regards,

N Vijay

Hi Will4,

One more clarification please,

If I change the input phase sequence will it have any other affects apart from showing correct efficiency.

Regards,

Naga

Hi Will4

Further digged the history and I noticed this happened since SIEMENS changed input MV Transformer 2 years back. Power cable size is cut to length and no chance of getting swapped. Can it be INPUT attenuator cables reversal. If yes can I Swap that cables please confirm

Regards,

N Vijay