Danfoss VLT AutomationDrive FC 300 Programming Manual page 43

Parameter Descriptions
1-37 d-axis Inductance (Ld)
Range: Function:
PM, non-salient SPM (Permanent Magnet
Motor).
For a selection with one decimal, use this
parameter. For a selection with three
decimals, use 30-80 d-axis Inductance (Ld).
FC 302 only.
1-38 q-axis Inductance (Lq)
Range:
Size related [0.000 - 1000
*
mH]
1-39 Motor Poles
Range: Function:
Size related [2 - 100 ] Enter the number of motor poles.
*
Poles ~n @ 50Hz
n
2 2700-2880
4 1350-1450
6 700-960
Table 3.6
Table 3.6 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 1-39 Motor Poles
based on 1-23 Motor Frequency and 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 when running at 1000 RPM.
*
V] Back EMF is the voltage generated by a PM
motor when no frequency converter is
connected and the shaft is turned externally.
Back EMF is normally specified for nominal
motor speed or for 1000 RPM measured
between two lines. If the value is not
available for a motor speed of 1000 RPM,
calculate the correct value as follows. If back
EMF is eg. 320 V at 1800 RPM, it can be
calculated at 1000 RPM as follows:
Calculate RPM at 1000 RPM as follows: Back
EMF= (Voltage/RPM)*1000 = (320/1800)*1000
= 178.
This is the value that must be programmed
for 1-40 Back EMF at 1000 RPM
®
VLT AutomationDrive Programming Guide
Function:
Set the value of the q-axis
inductance. See a motor data
sheet.
~n @60Hz
n
3250-3460
1625-1730
840-1153
®
MG33MG02 - VLT is a registered Danfoss trademark
1-40 Back EMF at 1000 RPM
Range: Function:
This parameter is only active when
1-10 Motor Construction is set to [1] PM motor
(Permanent Magnet Motor).
FC 302 only.
NOTE
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 16-20 Motor Angle into this parameter.
This parameter is only active when 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 related [0 - 1000 This parameter corresponds to the
*
mH] inductance saturation of Ld. Ideally;
this parameter has the same value as
1-37 d-axis Inductance (Ld). If the
motor supplier provides an induction
curve, enter the induction value at
200% of isNom here.
1-45 q-axis Inductance Sat. (LqSat)
Range: Function:
Size related [0 - 1000 This parameter corresponds to the
*
mH] inductance saturation of Lq. Ideally;
this parameter has the same value as
1-38 q-axis Inductance (Lq). If the
motor supplier provides an induction
curve, enter the induction value at
200% of isNom here.
1-46 Position Detection Gain
Range: Function:
100 % [20 - 200 %] Adjusts the amplitude of the test pulse
*
during position detection at start. Adjust
this parameter to improve the position
measurement.
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