Danfoss VLT AutomationDrive FC 302 Programming Manual page 49

Parameter Descriptions
1-51 Min Speed Normal Magnetising [RPM]
This parameter is not visible on the LCP.
Range: Function:
NOTICE
Size [10 -
related 300 RPM]
*
Parameter 1-51 Min Speed Normal
Magnetising [RPM] has no effect
when 1-10 Motor Construction = [1]
PM, non-salient SPM.
NOTICE
This parameter is not visible on the
LCP.
Set the required speed for normal
magnetising current. If the speed is set
lower than the motor slip speed,
parameter 1-50 Motor Magnetisation at
Zero Speed and parameter 1-51 Min Speed
Normal Magnetising [RPM] are of no
significance.
Use this parameter along with
parameter 1-50 Motor Magnetisation at
Zero Speed. See Table 3.7.
1-52 Min Speed Normal Magnetising [Hz]
Range: Function:
Size [ 0 - Set the required frequency for normal
related 250.0 Hz] magnetising current. If the frequency is
*
set lower than the motor slip frequency,
parameter 1-50 Motor Magnetisation at
Zero Speed is inactive.
Use this parameter along with
parameter 1-50 Motor Magnetisation at
Zero Speed. See Illustration 3.7.
1-53 Model Shift Frequency
Range: Function:
NOTICE
Size [ 4 -
related 18.0
*
This parameter cannot be adjusted
Hz]
while the motor is running.
Flux Model shift
Enter the frequency value for shift between 2
models for determining motor speed. Select
the value based on settings in
parameter 1-00 Configuration Mode and
parameter 1-01 Motor Control Principle. There
are 2 options: shift between Flux model 1 and
Flux model 2; or shift between Variable
Current mode and Flux model 2. FC 302 only.
Flux model 1 – Flux model 2
This model is used when
parameter 1-00 Configuration Mode is set to
MG33MJ02
Programming Guide
1-53 Model Shift Frequency
Range:
1-54 Voltage reduction in fieldweakening
Range:
0 V [0 - 100
*
V]
Danfoss A/S © Rev. 10/2014 All rights reserved.
Function:
Speed closed loop [1] or Torque [2], and
parameter 1-01 Motor Control Principle 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 applications.
f x 0.1 f x 0.125
N,M N,M
Flux model 1 Flux model 2
P 1-53
Illustration 3.8 Parameter 1-00 Configu-
ration Mode = [1] Speed closed loop or [2]
Torque and parameter 1-01 Motor Control
Principle = [3] Flux w/motor feedback
Variable Current - Flux model - Sensorless
This model is used when
parameter 1-00 Configuration Mode is set to
[0] Speed open loop and parameter 1-01 Motor
Control Principle is set to [2] Flux sensorless.
In speed open loop in Flux mode, the speed
is determined from the current measurement.
Below f x 0.1, the frequency converter
norm
runs on a variable current model. Above f
x 0.125 the frequency converter runs on a
Flux model.
f f
x 0.1 x 0.125
N,M N,M
Variable
current Flux model 2
model
P 1-53
Illustration 3.9 Parameter 1-00 Configu-
ration Mode = [0] Speed open loop,
parameter 1-01 Motor Control Principle =
[2] Flux sensorless
Function:
The value of this parameter reduces the
maximal voltage available for the Flux of the
motor in fieldweakning, giving more voltage
available for torque. Be aware that an excessive
value may cause stall problems at high speed.
3 3
f
out
norm
f
out
47