Owner manual

68
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3.7.1 V/f characteristic control
You have to change from I
0
control (factory setting) to V/f
characteristic control if you want to supply several drives with
different loads or rated power from one inverter. Also for pump and
blower drives to be operated with a square characteristic, a V/f
characteristic control is required.
V/f characteristic
With V/f characteristic control the output voltage is controlled
according to the characteristic set via C014 and C016.
Via code C014 you can determine whether the characteristic
should have a linear or a square shape.
1
0
0
V
400V
1
f
d
f
dN
V
min
rated point
1
0
0
V
400V
1
f
d
f
dN
V
min
rated point
linear characteristic square characteristic
The square characteristic can be used for pump and blower drives
or comparable applications.
V/f rated frequency
With the V/f rated frequency, the slope of the characteristic is set.
The value to be entered under C015 results from the motor ratings:
V f rated frequency
V
V
rated motor frequency
Nmotor
/ =
400
⋅
The values for the most common motor types can be obtained from
the following table.
Motor data V/f rated
rated voltage rated frequency frequency (C015)
380V 50Hz 52.6Hz
400V 50Hz 50.0Hz
415V 50Hz 48.2Hz
415V 60Hz 57.8Hz
440V 60Hz 54.5Hz
460V 60Hz 52.2Hz
480V 50Hz 41.7Hz
480V 60Hz 50.0Hz