Danfoss VLT AutomationDrive FC 301 Programming Manual page 86

VLT AutomationDrive FC 301/302
Programming Guide
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:
(320 ÷ 1800) × 1000 = 178
When using PM motors, it is recommended to use brake resistors.
Parameter 1-44 d-axis Inductance Sat. (LdSat)
Table 95: Parameter 1-44 d-axis Inductance Sat. (LdSat)
1-44 d-axis Inductance Sat. (LdSat)
Default value: Size related
Conversion index: -6
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.
Parameter 1-45 q-axis Inductance Sat. (LqSat)
Table 96: Parameter 1-45 q-axis Inductance Sat. (LqSat)
1-45 q-axis Inductance Sat. (LqSat)
Default value: Size related
Conversion index: -6
This parameter corresponds to the 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.
Parameter 1-46 Position Detection Gain
Table 97: Parameter 1-46 Position Detection Gain
1-46 Position Detection Gain
Default value: 120%
Conversion index: 0
Adjusts the amplitude of the test pulse during position detection at start. Adjust this parameter to improve the position measure-
ment.
Parameter 1-47 Torque Calibration
Table 98: Parameter 1-47 Torque Calibration
1-47 Torque Calibration
Default value: [0] Off
Conversion index: –
86 | Danfoss A/S © 2022.12
N O T I C E
N O T I C E
Parameter type: Range, 0.001 - 1000 mH
Data type: Int32
Parameter type: Range, 0 - 1000 mH
Data type: Int32
Parameter type: Range, 20 - 200%
Data type: Uint16
Parameter type: Option
Data type: Uint8
Parameter Descriptions
Setup: All setups
Change during operation: False
Setup: All setups
Change during operation: False
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: True
AU275636650261en-000101 / 130R0334