Variable Current - Flux model - Sensorless
This model is used when par. 1-00 is set to
Speed open loop
[0] and par. 1-01 is set to
Flux sensorless
[2].
In speed open loop in flux mode, the speed is determined from the current measurement.
Below f
norm
x 0.1, the frequency converter runs on a Variable Current model. Above f
norm
x 0.125 the frequency
converter runs on a Flux model.
Illustration 2.3: Par. 1-00 = [0] Speed open loop, Par. 1-01 = [2] Flux sensorless
1-55 U/f Characteristic - U
Range:
Function:
Size related [0.0 - max. motor volt-
age]
Enter the voltage at each frequency point to manually form a U/f characteristic matching the motor.
The frequency points are defined in par. 1-56
U/f Characteristic - F
.
This parameter is an array parameter [0-5] and is only accessible when par. 1-01
Motor Control Principle
is set
to
U/f
[0].
1-56 U/f Characteristic - F
Range:
Function:
Size related
*
[0.0 - max. motor
frequency]
Enter the frequency points to manually form a U/f-characteristic matching the motor.
The voltage at each point is defined in par. 1-55
U/f Characteristic - U
.
This parameter is an array parameter [0-5] and is only accessible when par. 1-01
Motor Control Principle
is set
to
U/f
[0].
2.4.6. 1-6* Load Depend. Setting
Parameters for adjusting the load-dependent motor settings.
1-60 Low Speed Load Compensation
Range:
Function:
100%
*
[0 - 300%]
Enter the % value to compensate voltage in relation to load when the motor is running at low speed and obtain
the optimum U/f characteristic. The motor size determines the frequency range within which this parameter is
active.
2. How to Programme
FC 300 Programming Guide
46
MG.33.M3.02 - VLT
®
is a registered Danfoss trademark
2
