Figure 9-17: Programmable Vhz Curve - Eaton SLX9000 User Manual

SLX9000 Adjustable Frequency Drives User Manual
2.6.3
2.6.4
2.6.5
2.6.6
9-22
Programmable The VHz curve can be programmed with three different points.
VHz curve: 2 Programmable VHz curve can be used if the other settings do not
satisfy the needs of the application.
Linear with flux The drive starts to search for the minimum motor current and in
optimization: 3 order to save energy, lower the disturbance level and the noise.
Can be used in applications with constant motor load, such as
fans, pumps, etc.
V
Vn
ID603 Default: Nominal
Voltage of the Motor
ID605
(Default 10%)
ID606
(Default 1.3%)

Figure 9-17: Programmable VHz Curve

Field weakening point
The field weakening point is the output frequency at which the output voltage
reaches the value set with par. 2.6.4.
Voltage at field weakening point
Above the frequency at the field weakening point, the output voltage remains at the
value set with this parameter. Below the frequency at the field weakening point, the
output voltage depends on the setting of the VHz curve parameters. See parameters
2.1.13, 2.6.2, 2.6.5, 2.6.6 and 2.6.7 and Figure 9-17.
When the parameters 2.1.6 and 2.1.7 (nominal voltage and nominal frequency of the
motor) are set, the parameters 2.6.3 and 2.6.4 are automatically given the
corresponding values. If you need different values for the field weakening point and
the voltage, change these parameters after setting the parameters 2.1.6 and 2.1.7.
VHz curve, middle point frequency
If the programmable VHz curve has been selected with parameter 2.6.2, this
parameter defines the middle point frequency of the curve. See Figure 9-17.
VHz curve, middle point voltage
If the programmable VHz curve has been selected with the parameter 2.6.2, this
parameter defines the middle point voltage of the curve. See Figure 9-17.
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ID604
(Default 5 Hz)
ID602
ID603
ID604
ID605
Field Weakening
Point
Default: Nominal
Frequency of the
Motor
f[Hz]
ID602
January 2009
MN04003020E