Un
ID603
ID602
U[V]
f[Hz]
P1
P2
P3
ID604
ID605
ID606
1
2
3
9119
Programmable U/f curve
Pos. Description
1 Default: Nominal voltage of the motor
2 Field weakening point
3 Default: Nominal frequency of the motor
This parameter is forced to value "1"
Linear when parameter Motor type is set to
value "1" Permanent Magnet Synchronous
Motor (PMSM).
When this parameter is changed,
parameters P3.1.4.2, P3.1.4.3, P3.1.4.4,
P3.1.4.5 and P3.1.4.6 will be automatically
set to their default values if parameter
P3.1.2.2 is set to "0" Induction Motor (IM).
P3.1.4.3 Voltage at FWP
Above the frequency at the field weakening point, the
output voltage remains at the set maximum value.
Below the frequency at the field weakening point, the
output voltage depends on the setting of the U/f curve
parameters. See parameters P3.1.4.1, P3.1.4.4 and
P3.1.4.5.
When the parameters P3.1.1.1 and P3.1.1.2 (Motor
Nom Voltg and Motor Nom Freq) are set, the
parameters P3.1.4.2 and P3.1.4.3 are automatically
given the corresponding values. If you need different
values for the field weakening point and the maximum
output voltage, change these parameters after setting
the parameters P3.1.1.1 and P3.1.1.2.
If the programmed maximum frequency is higher than
motor nominal frequency, field weakening point is
automatically set at maximum frequency and fwp
voltage is set proportionally higher than 100 %.
This could allow to exploit the higher voltage possibly
coming from the panels.
In this situation the current limit has to be set properly,
to prevent a motor overload.
If the drive is fed from mains, maximum output
frequency will be limited by actual DC voltage,
according to nominal U/f ratio.
P3.1.4.12.1 I/f start
If the function is activated, the drive is set to current
control mode and a constant current defined by
P3.1.4.11.3 is fed to the motor until the drive output
frequency exceeds the level defined with P3.1.4.11.2.
When the output frequency has increased above I/f
Start Frequency level, drive operation mode is
changed smoothly back to normal U/f –control mode.
P3.1.4.12.2 I/f start frequency
I/f start function is used when the drive's output
frequency is below this frequency limit. When the
output frequency exceeds this limit, the drive
operation mode is changed back to normal U/f control
mode.
P3.1.4.12.3 I/f start current
This parameter defines the current to be fed to the
motor when the I/f start function is activated.
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