Danfoss VLT AutomationDrive FC 301 Programming Manual page 84

VLT AutomationDrive FC 301/302
Programming Guide
Parameter 1-36 Iron Loss Resistance (Rfe)
Table 89: Parameter 1-36 Iron Loss Resistance (Rfe)
1-36 Iron Loss Resistance (Rfe)
Default value: Size related
Conversion index: -3
This parameter cannot be adjusted while the motor is running.
Enter the equivalent iron loss resistance (R
performing an AMA. The R
Fe
Loss Resistance (Rfe) on default setting.
Parameter 1-37 d-axis Inductance (Ld)
For induction motors, stator resistance and d-axis inductance values are normally described technical specifications as between line
and common (starpoint). For PM motors, they are typically described in technical specifications as between line-to-line. PM motors
are typically built for start connection.
Table 90: Parameters Related to PM Motors
Parameter
Parameter 1-30 Stator Resistance
(Rs) (line to common).
Parameter 1-37 d-axis Inductance
(Ld) (line to common).
Parameter 1-40 Back EMF at 1000
RPM RMS (line to line value).
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 (starpoint) or line between line. There is no
general standard. The different setups of stator winding resistance and induction are shown in
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 AC drives always require the line-to-line RMS value measured at
1000 RPM, mechanical speed of rotation, see
Line to common (starpoint)
Rs and Ld
Illustration 31: Stator Winding Setups
84 | Danfoss A/S © 2022.12
Parameter type: Range, 0 - 10000.000 Ohm]
Data type: Uint32
N O T I C E
) value to compensate for iron loss in the motor. The R
Fe
value is especially important in torque control applications. If R
Function
This parameter gives stator winding resistance (R
sistance. 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.
This parameter gives direct axis inductance of the PM motor. The daxis inductance is defined
for phase-to-common measurement. For lineline data, where stator resistance is measured
between any 2 lines, divide by 2.
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.
N O T I C E
Illustration
Line-to-line values
Rs and Ld
s
32.
Parameter Descriptions
Setup: All setups
Change during operation: False
value cannot be found by
Fe
is unknown, leave parameter 1-36 Iron
Fe
) similar to asynchronous motor stator re-
Illustration 31. Danfoss AC drives
AU275636650261en-000101 / 130R0334