Danfoss VLT Midi Drive FC 280 Programming Manual page 37

Parameter Descriptions
1-40 Back EMF at 1000 RPM
Range: Function:
for nominal motor speed or for 1000 RPM
measured between 2 lines. If the value is
not available for a motor speed of 1000
RPM, calculate the correct value as follows:
If back EMF is, for example, 320 V at 1800
RPM, it can be calculated at 1000 RPM:
Example
Back EMF 320 V at 1800 RPM. Back EMF =
(Voltage/RPM)*1000 = (320/1800)*1000 =
178.
This parameter is only active when
parameter 1-10 Motor Construction is set to
options that enable PM (permanent
magnet) motors.
NOTICE
When using PM motors, it is
recommended to use brake resistors.
1-42 Motor Cable Length
Range: Function:
50 m [0 - 100 m] Set the motor cable length in meters.
*
1-43 Motor Cable Length Feet
Range: Function:
164 ft [0 - 328 ft] Set the motor cable length. The length unit
*
is foot.
1-44 d-axis Inductance Sat. (LdSat)
Range: Function:
Size [ 0 - This parameter is active only when
related 1000 parameter 1-10 Motor Construction is set to [3]
mH] PM, salient IPM, Sat.
This parameter corresponds to the saturation
inductance of d-axis. The default value is the
value set in parameter 1-37 d-axis Inductance
(Ld). In most cases, do not change the default
value. If the motor supplier provides the
saturation curve, enter the d-axis inductance
value, which is 100% of the nominal current.
1-45 q-axis Inductance Sat. (LqSat)
Range: Function:
Size [ 0 - This parameter is active only when
related 1000 parameter 1-10 Motor Construction is set to
*
mH] [3] PM, salient IPM, Sat.
This parameter corresponds to the q-axis
saturation inductance. The default value is
the value set in parameter 1-38 q-axis
Inductance (Lq). In most cases, do not
change the default value. If the motor
supplier provides the saturation curve, enter
MG07C302
Programming Guide
1-45 q-axis Inductance Sat. (LqSat)
Range:
1-46 Position Detection Gain
Range:
100 %
*
1-48 Current at Min Inductance for d-axis
Range:
100 %
1-49 Current at Min Inductance for q-axis
Range:
100 %
1-50 Motor Magnetisation at Zero Speed
Range:
100
% 300 %
*
]
1-52 Min Speed Normal Magnetising [Hz]
Range:
1 Hz
*
Hz]
Danfoss A/S © 07/2016 All rights reserved.
Function:
the q-axis inductance value, which is 100%
of the nominal current.
Function:
[ 20 - Adjust the amplitude of the test pulse
200 %] during position detection at start. Adjust
this parameter to improve the position
measurement.
Function:
[ 20 - 200 %] Use this parameter to set the inductance
saturation point.
Function:
[ 20 - This parameter specifies the saturation curve of
200 %] the q-inductance values. From 20–100% of this
parameter, the inductance is linearly
approximated due to parameter 1-38 q-axis
Inductance (Lq) and parameter 1-45 q-axis
Inductance Sat. (LqSat). These parameters are
related to the motor nameplate load compen-
sations, the application load type, and the
electronic brake function for quick stop/hold of
the motor.
Function:
[0 - Use this parameter along with parameter 1-52 Min
Speed Normal Magnetising [Hz] to obtain a
different thermal load on the motor when running
at low speed.
Enter a value that is a percentage of the rated
magnetizing current. If the setting is too low, the
torque on the motor shaft may be reduced.
Magn. current
90%
Par.1-50
Par.1-52
Illustration 4.1 Motor Magnetization
Function:
[ 0.1 - 10.0 Set the required frequency for normal
magnetizing current. Use this parameter
along with parameter 1-50 Motor Magneti-
sation at Zero Speed, also see Illustration 4.1.
4 4
Hz
35