Lenze i950 Series, Manual

Page: 241 / 500

13.4.3 Define V/f characteristic shape
For adaptation purposes to different load profiles, you can select the shape of the characteris-
tic:
Parameter
Address Name / setting range / [default setting] Info
0x2B00 V/f characteristic shape
•
Setting can only be changed if the inverter is inhibi-
ted.
Selection of the V/f characteristic shape for the adaptation to different
load profiles.
0 Linear Linear characteristic for drives with constant load torque over the speed.
4
Linear V/f characteristic
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1 Quadratic Square-law characteristic for drives with a square-law load torque over
the speed.
•
Square-law V/f characteristics are preferably used for centrifugal
pumps and fan drives.
•
Please always check whether the corresponding drive is suitable for
operation with a square-law V/f characteristic!
•
If your pump drive or fan drive is not suitable for operation with a
square-law V/f characteristic, use the linear V/f characteristic instead.
4
Square-law V/f characteristic
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2 Multipoint User-definable characteristic for being adapted to special load profiles.
3 Eco Linear characteristic with energy optimisation in the partial load opera-
tional range.
13.4.3.1 Linear V/f characteristic
The linear V/f characteristic leads to a constant torque.
13.4.3.2 Square-law V/f characteristic
The square-law V/f characteristic is typically used in heating, ventilation and climate applica-
tions to control the speed of fans and pumps.
Configuring the motor control
V/f characteristic control for asynchronous motor (VFC open loop)
Define V/f characteristic shape
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