Danfoss VLT AutomationDrive FC 302 Programming Manual page 47

Parameter Descriptions
1-37 d-axis Inductance (Ld)
Range: Function:
inductance of the cable into account.
Divide the measured value by 2 and enter
the result.
This parameter is only active when
parameter 1-10 Motor Construction is set to
[1] PM, non-salient SPM (Permanent
Magnet Motor) or [5] Sync. Reluctance.
For a selection with 1 decimal, use this
parameter. For a selection with 3
decimals, use parameter 30-80 d-axis
Inductance (Ld).
FC 302 only.
NOTICE
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.
1-38 q-axis Inductance (Lq)
Range:
Size related [0.000 - 1000
*
mH]
1-39 Motor Poles
Range: Function:
Size related [2 - 128] Enter the number of motor poles.
*
Poles ~n @ 50 Hz
n
2 2700-2880
4 1350-1450
6 700-960
Table 3.7 Number of Poles for Normal Speed Ranges
Table 3.7 shows the number of poles for normal speed
ranges of various motor types. Define motors designed for
other frequencies separately. The motor pole value is
always an even number, because it refers to the total
number of poles, not pairs of poles. The frequency
converter creates the initial setting of parameter 1-39 Motor
Poles based on parameter 1-23 Motor Frequency and
parameter 1-25 Motor Nominal Speed.
1-40 Back EMF at 1000 RPM
Range: Function:
Size [0 - Set the nominal back EMF for the motor
related 9000 V] when running at 1000 RPM.
*
Back EMF is the voltage generated by a PM
motor when no frequency converter is
MG33MJ02
Programming Guide
Function:
Set the value of the q-axis
inductance. See the motor data
sheet.
~n @ 60 Hz
n
3250-3460
1625-1730
840-1153
Danfoss A/S © Rev. 10/2014 All rights reserved.
1-40 Back EMF at 1000 RPM
Range: Function:
connected and the shaft is turned
externally. Back EMF is normally specified
for nominal motor speed or for 1000 RPM
measured between 2 lines. If the value is
not available for a motor speed of 1000
RPM, calculate the correct value as follows.
If back EMF is e.g. 320 V at 1800 RPM, it
can be calculated at 1000 RPM:
Example
Back EMF 320 V at 1800 RPM. Back EMF =
(Voltage/RPM)*1000 = (320/1800)*1000 =
178.
This parameter is only active when
parameter 1-10 Motor Construction is set to
[1] PM motor (Permanent Magnet Motor).
FC 302 only.
NOTICE
When using PM motors, it is
recommended to use brake resistors.
1-41 Motor Angle Offset
Range: Function:
0 [-32768 Enter the correct offset angle between the PM
*
- 32767] motor and the index position (single-turn) of the
attached encoder or resolver. The value range of
0 - 32768 corresponds to 0 - 2 * pi (radians). To
obtain the offset angle value: After frequency
converter start-up apply DC-hold and enter the
value of parameter 16-20 Motor Angle into this
parameter.
This parameter is only active when
parameter 1-10 Motor Construction is set to [1] PM,
non-salient SPM (Permanent Magnet Motor).
1-44 d-axis Inductance Sat. (LdSat)
Range: Function:
Size [0 - This parameter corresponds to the
related 1000 mH] 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.
1-45 q-axis Inductance Sat. (LqSat)
Range: Function:
Size [0 - This parameter corresponds to the
related 1000 mH] 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
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