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Can the Altivar 31 be used for Constant Torque and Variable Torque loads?
Issue:
Constant and Variable Torque loads on ATV31.

Product Line:
Altivar 31

Environment:
ATV31 all series

Cause:
N/A

Resolution:
Yes.  It can be used for CT & VT applications.
Selection of the voltage/frequency ratio, parameter UFt in the drC menu, determines the torque setup. The available settings are as follows:
L: Constant torque (for motors connected in parallel or special motors)
P: Variable torque (pump and fan applications)
n: Sensorless flux vector control (for constant torque applications)
nLd: Energy savings (for variable torque applications not requiring high dynamics. This behaves in a way similar to the P ratio at no-load and the
n ratio with load.)
Modifying UFt will cause UFr to return to the factory setting of 20%.

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