Figure 7-22 Old and New Curves
7.10.3 Input Single-Phase Rollback
With NXGpro control, input voltage unbalance (E
unbalance
) is used for rolling back the drive output
torque. The gure below shows the reduction in drive power as a function of the unbalance
voltage. When the unbalance is less than 10%, the drive operates without any output limitation.
There is a linear reduction as the unbalance voltage increases from 10% to 30%, at which point
the input has a single-phase condition. When the input line voltage unbalance increases above
30%, the drive limits the amount of output power that can be delivered to the load to 40% of
rated.
A regulator is implemented to match the maximum drive power (P
max
) with the actual power
owing from the drive. The output of this regulator sets the output torque limit.
Operating the Control
7.10 Drive Output Torque Limiting
NXGPro+ Control Manual
214 Operating Manual, A5E50491925A
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