Danfoss VLT AutomationDrive FC 301 Programming Manual page 46

Parameter Descriptions
1-40 Back EMF at 1000 RPM
Range:
500. [10. -
V 9000
*
V]
3 3
1-41 Motor Angle Offset
Range:
0 [-32768 -
N/A 32767
N/A]
*
1-44 d-axis Inductance Sat. (LdSat)
Range:
Size
related 1000 mH]
*
44
Function:
NOTICE
This parameter is only active when
parameter 1-10 Motor Construction is set to
options that enable PM (permanent
magnet) motors.
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.
NOTICE
When using PM motors, it is
recommended to use brake resistors.
Function:
NOTICE
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.
Function:
[0 - This parameter corresponds to the
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.
Danfoss A/S © 01/2018 All rights reserved.
®
VLT AutomationDrive FC 301/302
1-45 q-axis Inductance Sat. (LqSat)
Range:
Size
related
*
1-46 Position Detection Gain
Range:
120 %
*
1-47 Torque Calibration
Option:
[0] Off
[1] 1st
start
after
pwr-up
[2] Every
start
[3] 1st
start
with
store
[4] Every
start
with
store
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
the cable length, frequency converter losses, and the
temperature deviation on the motor.
Calibrates at the first start-up after power-up and
keeps this value until reset by a power cycle.
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.
The frequency converter calibrates the torque at the
first start-up after power-up. This option is used to
update motor parameters:
•
Parameter 1-30 Stator Resistance (Rs).
•
Parameter 1-33 Stator Leakage Reactance
(X1).
•
Parameter 1-34 Rotor Leakage Reactance
(X2).
•
Parameter 1-37 d-axis Inductance (Ld).
The frequency converter calibrates the torque at
every start-up, compensating for a possible change
in motor temperature since last start-up. This option
is used to update motor parameters:
2
= P - R x I . Make
m s
value in this
s
MG33MO02