Danfoss FC 300 Programming Manual page 39

Parameter Descriptions
1-51 Min Speed Normal Magnetising [RPM]
Range: Function:
Application [10 - 300 Set the required speed for normal
dependent RPM] magnetising current. If the speed is set
*
lower than the motor slip speed,
par. 1-50 Motor Magnetisation at Zero
Speed and par. 1-51 Min Speed Normal
Magnetising [RPM] are of no significance.
Use this parameter along with
par. 1-50 Motor Magnetisation at Zero
Speed. See drawing for par. 1-50 Motor
Magnetisation at Zero Speed.
1-52 Min Speed Normal Magnetising [Hz]
Range: Function:
Application [Application Set the required frequency for normal
dependent dependant] magnetising current. If the frequency
*
is set lower than the motor slip
frequency, par. 1-50 Motor Magnetisa-
tion at Zero Speed is inactive.
Use this parameter along with
par. 1-50 Motor Magnetisation at Zero
Speed. See drawing for par. 1-50 Motor
Magnetisation at Zero Speed.
1-53 Model Shift Frequency
Range: Function:
Applica- [Applica- Flux Model shift
tion tion Enter the frequency value for shift between
two models for determining motor speed.
Choose the value based on settings in
par. 1-00 Configuration Mode and
par. 1-01 Motor Control Principle. There are
two options: shift between Flux model 1
and Flux model 2; or shift between Variable
Current mode and Flux model 2. This
parameter is available for FC 302 only.
This parameter cannot be adjusted while
the motor is running.
Flux Model 1 – Flux model 2
This model is used when par. 1-00 Configu-
ration Mode is set to Speed closed loop [1] or
Torque [2] and par. 1-01 Motor Control Princi-
ple is set to Flux w/motor feedback [3]. With
this parameter it is possible to make an
adjustment of the shifting point where FC
302 changes between Flux model 1 and
Flux model 2, which is useful in some
sensitive speed and torque control applica-
tions.
FC 300 Programming Guide
1-53 Model Shift Frequency
Range:
depend-
ent
1-54 Voltage reduction in fieldweakening
Range:
0 V
®
MG.33.M9.02 - VLT is a registered Danfoss trademark
Function:
depend-
ant]
*
Illustration 3.2: Par. 1-00 Configuration
Mode = [1] Speed closed loop or [2]
Torque and par. 1-01 Motor Control Princi-
ple = [3] Flux w/motor feedback
Variable Current - Flux model - Sensorless
This model is used when par. 1-00 Configu-
ration Mode is set to Speed open loop [0] and
par. 1-01 Motor Control Principle is set to
Flux sensorless [2].
In speed open loop in flux mode, the speed
is determined from the current measure-
ment.
Below f x 0.1, the frequency converter
norm
runs on a Variable Current model. Above
f x 0.125 the frequency converter runs
norm
on a Flux model.
Illustration 3.3: par. 1-00 Configuration
Mode = [0] Speed open loop,
par. 1-01 Motor Control Principle = [2] Flux
Function:
[0 - 100 V] The value of this parameter will reduce the
*
maximal voltage available for the flux of the
motor in fieldweakning, giving more voltage
available for torque. Be aware that too high
value may give stall problems at high speed.
sensorless
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