Danfoss FC 300 Programming Manual page 38

Parameter Descriptions
1-35 Main Reactance (Xh)
Range:
Applica- [Applica-
tion tion
depend- depend-
3 3
ent ant]
*
1-36 Iron Loss Resistance (Rfe)
Range:
Application
dependent tion depend-
*
ant]
1-37 d-axis Inductance (Ld)
Range:
Application
depend- tion
ent dependant]
*
1-39 Motor Poles
Range:
Application depend-
ent
*
Poles ~n @ 50 Hz
n
2 2700 - 2880
4 1350 - 1450
6 700 - 960
38
Function:
Set the main reactance of the motor using
one of these methods:
1. Run an AMA on a cold motor.
The frequency converter will
measure the value from the
motor.
2. Enter the X
h
Obtain the value from the motor
supplier.
3. Use the X default setting. The
h
frequency converter establishes
the setting on the basis of the
motor name plate data.
Function:
[Applica- Enter the equivalent iron loss resist-
ance (R ) value to compensate for
Fe
iron loss in the motor.
The R value cannot be found by
Fe
performing an AMA.
The R value is especially important in
Fe
torque control applications. If R
unknown, leave par. 1-36 Iron Loss
Resistance (Rfe) on default setting.
Function:
[Applica- Enter the value of the d-axis inductance.
Obtain the value from the permanent
magnet motor data sheet.
This parameter is only active when
par. 1-10 Motor Construction has the
value PM, non-salient SPM [1]
(Permanent Magnet Motor).
For a selection with one decimal, use
this parameter. For a selection with
three decimals, use par. 30-80 d-axis
Inductance (Ld).
This parameter is available for FC 302
only.
Function:
[2 - 100 ] Enter the number of motor
poles.
~n @60 Hz
n
3250 - 3460
1625 - 1730
840 - 1153
MG.33.M9.02 - VLT
FC 300 Programming Guide
The table shows the number of poles for normal speed ranges
of various motor types. Define motors designed for other
frequencies separately. The motor pole value is always an even
number, because it refers to the total number of poles, not
pairs of poles. The frequency converter creates the initial
setting of par. 1-39 Motor Poles based on par. 1-23 Motor
Frequency and par. 1-25 Motor Nominal Speed.
1-40 Back EMF at 1000 RPM
Range:
value manually.
Application
dependent
1-41 Motor Angle Offset
Range:
is
Fe
0 [-32768 -
*
32767 ]
3.3.5 1-5* Load Indep. Setting
1-50 Motor Magnetisation at Zero Speed
Range:
100
% 300
*
%]
®
is a registered Danfoss trademark
Function:
[Applica- Set the nominal back EMF for the
tion motor when running at 1000 RPM.
*
dependant] This parameter is only active when
par. 1-10 Motor Construction is set to
PM motor [1] (Permanent Magnet
Motor).
This parameter is available for FC 302
only.
NOTE
When using PM motors, it is
recommended to use brake
resistors.
Function:
Enter the correct offset angle between the PM
motor and the index position (single-turn) of the
attached encoder or resolver. The value range of 0 -
32768 corresponds to 0 - 2 * pi (radians). To obtain
the offset angle value: After frequency converter
start-up apply DC-hold and enter the value of
par. 16-20 Motor Angle into this parameter.
This parameter is only active when par. 1-10 Motor
Construction is set to PM, non-salient SPM [1]
(Permanent Magnet Motor).
Function:
[0 - Use this parameter along with par. 1-51 Min Speed
Normal Magnetising [RPM] to obtain a different
thermal load on the motor when running at low
speed.
Enter a value which is a percentage of the rated
magnetizing current. If the setting is too low, the
torque on the motor shaft may be reduced.
M ag n. cur r en t
100%
P ar .1-50
P ar .1-51
P ar .1-52
Hz
R PM