Operating mode
V/f char acteristic control
10
Function library
10.3
10.3.1
L
10.3-3
EDS82EV903-1.0-11/2002
10.3.1 V/f characteristic control
The output voltage of the controller follows a defined characteristic. For lower
output frequencies the characteristic can be boosted. The characteristic can be
adapted to different load profiles:
l Linear characteristic for drives with constant load torque over the speed.
l Square-law characteristic for drives with a load torque squared in relation to
the speed:
– Square-law V/f characteristics are mainly used for centrifugal pump and
fan drives. It is however necessary to check whether your individual pump
or fan application can be driven with this control mode.
– If your pump or fan drive is not suitable for operation with a square-law V/f
characteristic, select the linear V/f characteristic or the operating mode
”vector control”.
C0015
V [V]
out
f [Hz]
V
(100 %)
rmot
C0015
V [V]
out
f [Hz]
V
(100 %)
rmot
8200vec540 8200vec539
Fig. 10.3-2 Linear and square-low V/f characteristic
Description
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