Danfoss VLT AutomationDrive FC 301 Programming Manual page 63

Parameter Descriptions
1-40 Back EMF at 1000 RPM
Range: Function:
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.
NOTICE
When using PM motors, it is
recommended to use brake
resistors.
1-41 Motor Angle Offset
Range: Function:
NOTICE
0 [-32768 -
*
32767 ]
This parameter is only active
when parameter 1-10 Motor
Construction is set to [1] PM,
non-salient SPM (Permanent
Magnet Motor).
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.
1-44 d-axis Inductance Sat. (LdSat)
Range: Function:
Size [0 - 1000 This parameter corresponds to the
related 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.
M0013101
Programming Guide
1-45 q-axis Inductance Sat. (LqSat)
Range:
Size
related
*
1-46 Position Detection Gain
Range:
120 %
*
1-47 Torque Calibration
Option:
[0]
[1]
[2]
[3]
Danfoss A/S © 10/2019 All rights reserved.
Function:
[0 - 1000 This parameter corresponds to the
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 - 200 %] Adjusts the amplitude of the test
pulse 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
P - R x I 2 . Make sure that the R
m s
value is correct. The R
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
during power-up, ensuring 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 the cable length,
frequency converter losses, and the
temperature deviation on the
motor.
Off
1st start after
Calibrates at the 1
pwr-up
power-up and keeps this value until
reset by a power cycle.
Every start Calibrates at every start-up,
compensating for a possible change
in motor temperature since last
start-up. The value is reset after a
power cycle.
1st start with The frequency converter calibrates
store
the torque at the 1
power-up. This option is used to
update motor parameters:
3 3
=
shaft
s
value in this
s
value
s
st start-up after
st
start-up after
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