SLX9000 Adjustable Frequency Drives User Manual
9-22 For more information visit: www.eaton.com
MN04003020E
January 2009
Figure 9-17: Programmable VHz Curve
Programmable
VHz curve: 2
The VHz curve can be programmed with three different points.
Programmable VHz curve can be used if the other settings do not
satisfy the needs of the application.
Linear with flux
optimization: 3
The drive starts to search for the minimum motor current and in
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.
2.6.3 Field weakening point ID602
The field weakening point is the output frequency at which the output voltage
reaches the value set with par. 2.6.4.
2.6.4 Voltage at field weakening point ID603
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.
2.6.5 VHz curve, middle point frequency ID604
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.
2.6.6 VHz curve, middle point voltage ID605
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.
ID605
(Default 10%)
ID606
(Default 1.3%)
ID604
(Default 5 Hz)
ID602
V
f[Hz]
Vn
ID603
Default: Nominal
Voltage of the Motor
Field Weakening
Point
Default: Nominal
Frequency of the
Motor
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