Danfoss VLT AQUA Drive FC 202 Programming Manual page 53

Parameter Description
1-36 Iron Loss Resistance (Rfe)
Range: Function:
NOTICE
Size [ 0 -
related 10000.000
*
This parameter cannot be
Ohm]
adjusted while the motor is
running.
Enter the equivalent iron loss resistance
(R ) value to compensate for iron
Fe
losses in the motor.
The R
performing an AMA.
The R
torque control applications. If R
unknown, leave parameter 1-36 Iron
Loss Resistance (Rfe) on default setting.
1-37 d-axis Inductance (Ld)
Range: Function:
NOTICE
Size [0.000 -
related 1000.000
*
This parameter is only active
mH]
when parameter 1-10 Motor
Construction is set to [1] PM,
non-salient SPM.
Enter the value of the d-axis
inductance. Obtain the value from the
PM motor datasheet.
For asynchronous motor, stator resistance, and d-axis
inductance values are normally described in technical
specifications as between line and common (startpoint).
For PM motors, they are typically described in technical
specifications as between line-line. PM motors are typically
built for star connection.
MG20OB02
Programming Guide
value cannot be found by
Fe
value is especially important in
Fe
is
Fe
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Parameter 1-30 Stator This parameter gives stator winding
Resistance (Rs) resistance (R
(line to common). motor stator resistance. The stator
resistance is defined for line-to-
common measurement. For line-line
data, where stator resistance is
measured between any 2 lines, divide
by 2.
Parameter 1-37 d-axis This parameter gives direct axis
Inductance (Ld) inductance of the PM motor. The d-
(line to common). axis inductance is defined for phase-
to-common measurement. For line-
line data, where stator resistance is
measured between any 2 lines, divide
by 2.
Parameter 1-40 Back EMF This parameter gives back EMF across
at 1000 RPM stator terminal of PM motor at 1000
RMS (line to line value). RPM mechanical speed specifically. It
is defined between line-to-line and
expressed in RMS value.
Table 3.6 Parameters Related to PM Motors
NOTICE
Motor manufacturers provide values for stator resistance
(parameter 1-30 Stator Resistance (Rs)) and d-axis
inductance (parameter 1-37 d-axis Inductance (Ld)) in
technical specifications as between line and common
(startpoint) or line between line. There is no general
standard. The different set-ups of stator winding
resistance and induction are shown in Illustration 3.6.
Danfoss frequency converters always require the line-to-
common value. The back EMF of a PM motor is defined
as induced EMF developed across any of 2 phases of
stator winding of a free-running motor. Danfoss
frequency converters always require the line-to-line RMS
value measured at 1000 RPM, mechanical speed of
rotation. This is shown in Illustration 3.7.
Line to common (starpoint)
Rs and Ld
Illustration 3.6 Stator Winding Set-ups
) similar to asynchronous
s
Line-to-line values
Rs and Ld
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