ASFIFF12 High Speed
vacon • 23
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Linear with flux optimisation:
3
The frequency converter starts to search for the minimum motor current in
order to save energy, lower the disturbance level and the noise. This function
can be used in applications with constant motor load, such as fans, pumps
etc.
109 U/f
optimisation
(2.6.2)
Automatic
torque
boost
The voltage to the motor changes automatically which makes the motor
produce sufficient torque to start and run at low frequencies. The voltage
increase depends on the motor type and power. Automatic torque boost
can be used in applications where starting torque due to starting friction
is high, e.g. in conveyors.
NOTE
! This feature is not usable if
= 0.
3
What changes are required to start with load from 0 Hz?
♦
First set the motor nominal values (Parameter group 2.1).
Option 1: Activate the Automatic torque boost.
Option 2: Programmable U/f curve
To get torque you need to set the zero point voltage and midpoint voltage/frequency (in
parameter group 2.6) so that the motor takes enough current at low frequencies.
First set
to
Programmable U/f curve
(value
2
). Increase zero point voltage (
)
to get enough current at zero speed. Set then the midpoint voltage (
) to
1.4142*ID606 and midpoint frequency (
) to value ID606/100%*ID111.
NOTE!
In high torque – low speed applications – it is likely that the motor will
overheat. If the motor has to run a prolonged time under these
conditions, special attnetion must be paid to cooling the motor. Use
external cooling for the motor if the temperature tends to rise too high.
110
Nominal voltage of the motor
(2.1.6)
Find this value U
n
on the rating plate of the motor. This parameter sets the voltage at the
field weakening point (
) to 100% * U
nMotor
.
111
Nominal frequency of the motor
(2.1.7)
Find this value f
n
on the rating plate of the motor. This parameter sets the field
weakening point (
) to the same value.
112
Nominal speed of the motor
(2.1.8)
Find this value n
n
on the rating plate of the motor.
113
Nominal current of the motor
(2.1.9)
Find this value I
n
on the rating plate of the motor.
NOTE! The Max value for this parameter might differ for FR9 and bigger, and for NXW.
