Danfoss VLT AutomationDrive EZ FC 321 Programming Manual page 73

VLT® AutomationDrive EZ FC 321
Programming Guide
The parameter value is updated after each torque calibration if option [3] 1st start with store or option [4] Every start with store is
selected in parameter 1-47 Torque Calibration.
Parameter 1-38 q-axis Inductance (Lq)
Table 92: Parameter 1-38 q-axis Inductance (Lq)
1-38 q-axis Inductance (Lq)
Default value: Size related
Conversion index: -6
Set the value of the q-axis inductance. See the motor datasheet.
Parameter 1-39 Motor Poles
Table 93: Parameter 1-39 Motor Poles
1-39 Motor Poles
Default value: Size related
Conversion index: 0
Enter the number of motor poles. Make sure not to enter pairs of motor poles.
Table 94: Pole Number for Normal Speed Ranges
Poles
2
4
6
The table shows the pole number for normal speed ranges of various motor types. Define motors designed for other frequencies
separately. The motor pole value is always in even number because it refers to the total pole number, not pairs of poles. The drive
creates the initial setting of parameter 1-39 Motor Poles based on parameter 1-23 Motor Frequency and parameter 1-25 Motor Nominal
Speed.
Parameter 1-40 Back EMF at 1000 RPM
Table 95: Parameter 1-40 Back EMF at 1000 RPM
1-40 Back EMF at 1000 RPM
Default value: Size related
Conversion index: 0
This parameter is only active when parameter 1-10 Motor Construction is set to options that enable PM (permanent magnet) mo-
tors.
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
drive is connected and the shaft is turned externally. Back EMF is normally specified for nominal motor speed or for 1000 RPM meas-
ured between 2 lines. If the value is not available for a motor speed of 1000 RPM, calculate the correct value as follows:
Back EMF = (Voltage ÷ RPM) × 1000
In an example where the voltage is 320 V and RPM is 1800, the back EMF at 1000 RPM is:
Danfoss A/S © 2021.08
N O T I C E
Parameter type: Range, 0.000 - 1000 mH]
Data type: Uint32
Parameter type: Range, 2 - 132
Data type: Uint32
~n @ 50 Hz
n
2700–2880
1350–1450
700–960
Parameter type: Range, 1 - 9000 V
Data type: Uint16
N O T I C E
Parameter Descriptions
Setup: All setups
Change during operation: False
Setup: All setups
Change during operation: False
~n @ 60 Hz
n
3520–3460
1625–1730
840–1153
Setup: All setups
Change during operation: False
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