Danfoss VLT AutomationDrive FC 302 Programming Manual page 46

Parameter Descriptions
Poles ~n @ 50 Hz
n
2 2700-2880
4 1350-1450
6 700-960
3 3
Table 3.6 Number of Poles for Normal Speed Ranges
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 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:
Size [0 -
related 9000 V]
*
1-41 Motor Angle Offset
Range:
0 [-32768 -
*
32767 ]
44
VLT
~n @ 60 Hz
n
3250-3460
1625-1730
840-1153
Function:
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 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 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 eg. 320 V at 1800 RPM, it can
be calculated at 1000 RPM as follows:
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.
Function:
Enter the correct offset angle between the PM
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.
®
AutomationDrive FC 301/302 Programming Guide
1-41 Motor Angle Offset
Range:
1-44 d-axis Inductance Sat. (LdSat)
Range:
Size
related
*
1-45 q-axis Inductance Sat. (LqSat)
Range:
Size
related
*
1-46 Position Detection Gain
Range:
100 % [20 - 200
*
%]
1-47 Torque Calibration
Use this parameter to optimise the torque estimate in the full
speed range. The estimated torque is based on the shaft power,
P = P - R
shaft m
correct R value. The R
s
power loss in both the motor, the cable and the frequency
converter. Sometimes it is not possible to adjust
parameter 1-30 Stator Resistance (Rs) on each frequency converter
to compensate for the cable length, frequency converter losses
and the temperature deviation on the motor. When enabling this
function, the frequency converter calculates the R
starts, ensuring the optimal torque estimate and thereby optimal
performance.
Option:
[0] Off
[1] 1st start after
pwr-up
[2] Every start
MG33MI02 - Rev. 2013-11-20
Function:
This parameter is only active when
parameter 1-10 Motor Construction is set to [1] PM,
non-salient SPM (Permanent Magnet Motor).
Function:
[0 - This parameter corresponds to the
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 here.
Function:
[0 - This parameter corresponds to the
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
curve, enter the induction value at 200%
of the nominal value here.
Function:
Adjusts the amplitude of the test pulse
during position detection at start. Adjust
this parameter to improve the position
measurement.
2
* I . This means that it is important to have the
s
value in this formula is equal to the
s
Function:
Calibrates at the first start-up after
power up and keeps this value until
reset by a power cycle.
Calibrates at every start-up, compen-
sating for a possible change in motor
value when it
s