1-35 Main Reactance (Xh)
Range:
Function:
Size
related
*
[ 1.0000 -
10000.0000
Ohm]
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
value manually.
Obtain the value from the
motor supplier.
3.
Use the X
h
default setting.
The frequency converter
establishes the setting on the
basis of the motor name
plate data.
NOTE
will not have effect when
= [1] PM, non salient SPM.
NOTE
This parameter cannot be adjusted while running.
1-36 Iron Loss Resistance (Rfe)
Range:
Function:
Size
related
*
[ 0 -
10000.000
Ohm]
Enter the equivalent iron loss
resistance (R
Fe
) value to compensate
for iron losses in the motor.
The R
Fe
value cannot be found by
performing an AMA.
The R
Fe
value is especially important
in torque control applications. If R
Fe
is unknown, leave
on default setting.
NOTE
This parameter cannot be adjusted while the motor is
running.
NOTE
This parameter is not available from the LCP.
1-37 d-axis Inductance (Ld)
Range:
Function:
Size related
*
[ 0.000 - 0.000
mH]
Enter the value of the d-axis
inductance. Obtain the value from
the permanent magnet motor
data sheet.
NOTE
This parameter is only active when
has the value PM, non-salient SPM [1] (Permanent Magnet
Motor).
Stator resistance and d-axis Inductance values are
normally, for asynchronous motors, described in technical
specifications as between line and common (starpoint). For
Permanent magnet motors they are typically described in
technical specifications as between Line-Line. PM motors
are typically built for star connection.
(Line to common)
This parameter gives stator winding
resistance (R
s
) Similar to Asynchronous
Motor Stator resistance. The Stator
resistance is defined for line to common
measurement. That means for line-line
data (Where stator resistance is measured
between any two lines you need to divide
it with 2).
(Line to common)
This parameter gives direct axis
inductance of the PM motor. The d-axis
inductance is defined for phase to
common measurement. That means for
line-line data (Where stator resistance is
measured between any two lines you
need to divide it with 2
RMS (Line to Line
Value )
This parameter gives back emf across
stator terminal of PM Motor at 1000 rpm
mechanical speed specifically. It is defined
between line to line and expressed in
RMS Value
Table 3.4
NOTE
Motor manufacturers provide values for Stator resistance
(
) and d-axis Inductance (
) in technical specifications as between
line and common (starpoint) or between Line-Line. There is
no general standard. The different setups of Stator
Winding Resistance and Induction are shown in
. Danfoss inverters always require the line to
common value. The back emf of PM motor is defined as
`Induced emf developed across any of two phases of stator
winding of free running Motor'. Danfoss inverters always
require the Line to Line RMS value measured at 1000 rpm,
mechanical speed of rotation. This is shown in
)
Parameter Description
VLT
®
Refrigeration Drive Programming Guide
40
MG16H102 - VLT
®
is a registered Danfoss trademark
3
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