Danfoss VLT AutomationDrive FC 301 Programming Manual page 52

Parameter Descriptions
1-38 q-axis Inductance (Lq)
Range:
Size related
*
mH]
3 3
1-39 Motor Poles
Range:
Size related
*
Poles ~n @ 50 Hz
n
2 2700–2880
4 1350–1450
6 700–960
Table 3.6 Pole Number for Normal Speed Ranges
Table 3.6 shows the pole number 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 pole number,
not pairs of poles. The frequency converter creates the
initial setting of parameter 1-39 Motor Poles based on
parameter 1-23 Motor Frequency and parameter 1-25 Motor
Nominal Speed.
1-40 Back EMF at 1000 RPM
Range:
Size [0 -
related 9000 V]
*
50
Function:
[0.000 - 1000 Set the value of the q-axis
inductance. See the motor
datasheet.
Function:
[2 - 128] Enter the number of motor poles.
~n @ 60 Hz
n
3250–3460
1625–1730
840–1153
Function:
Set the nominal back EMF for the motor
when running at 1000 RPM.
Back EMF is the voltage generated by a PM
motor when no frequency converter is
connected and the shaft is turned
externally. Back EMF is normally specified
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.
Danfoss A/S © 02/2016 All rights reserved.
®
VLT AutomationDrive FC 301/302
1-41 Motor Angle Offset
Range:
0 [-32768
*
- 32767]
1-44 d-axis Inductance Sat. (LdSat)
Range:
Size
related
*
1-45 q-axis Inductance Sat. (LqSat)
Range:
Size
related
*
1-46 Position Detection Gain
Range:
100 %
*
1-47 Torque Calibration
Option:
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 x pi (radians). To
obtain the offset angle value: After frequency
converter start-up, apply DC hold and enter the
value of parameter 16-20 Motor Angle into this
parameter.
This parameter is only active when
parameter 1-10 Motor Construction is set to [1] PM,
non-salient SPM (Permanent Magnet Motor).
Function:
[0 - This parameter corresponds to the
1000 mH] inductance saturation of Ld. Ideally, this
parameter has the same value as
parameter 1-37 d-axis Inductance (Ld). If
the motor supplier provides an induction
curve, enter the induction value at 200%
of the nominal value.
Function:
[0 - This parameter corresponds to the
1000 mH] inductance saturation of Lq. Ideally, this
parameter has the same value as
parameter 1-38 q-axis Inductance (Lq). If
the motor supplier provides an induction
curve, enter the induction value at 200%
of the nominal value.
Function:
[20 - Adjusts the amplitude of the test pulse
200 %] during position detection at start. Adjust
this parameter to improve the position
measurement.
Function:
Use this parameter to optimize the torque estimate
in the full speed range. The estimated torque is
based on the shaft power, P
shaft
sure that the R value is correct. The R
s
formula is equal to the power loss in the motor, the
cable, and the frequency converter. When this
parameter is active, the frequency converter
calculates the R value during power-up, ensuring
s
the optimal torque estimate and optimal
performance. Use this feature in cases when it is not
possible to adjust parameter 1-30 Stator Resistance
(Rs) on each frequency converter to compensate for
2
= P - R x I . Make
m s
value in this
s
MG33ML02