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Customer wants to reset the consumption in an ATV61/71 drive via the Modbus network. Is it possible.

Yes, it is possible to Reset consumption in an ATV61/71 drive via Modbus, using RPR register, @: 3120.
 
It operates little bit differently for ATV61 than ATV71:
 
ATV71:
Consumption:    APH    @: 3230
Reset:        RPR =    0    [No] (nO)
                                1    [reset kWh] (APH)
                                2    [rst. runtime] (rtH)
                                3    [rst runtim I] (rtHI)
                                4    [rst. P On t.] (PtH)
                              64    [Reset all] (ALL)
So, ATV71 consumption reset can be done by RPR = 1
 
ATV61:
Consumption:    IPHR    @: 3237
Reset:        RPR    0    [No] (nO)
                             1    [reset kWh] (APH)
                             2    [rst. runtime] (rtH)
                             3    [rst runtim I] (rtHI)
                             4    [rst. P On t.] (PtH)
                             5    [kW/h Reset] (IPHr)
                             6    [kW/h Reset] (IPH)
                           64    [Reset all] (ALL)
So, ATV61 consumption reset can be done by RPR = 5
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