Danfoss VLT AutomationDrive FC 301 Programming Manual page 43

Parameter Descriptions
Poles ~n @ 50 Hz
n
2 2700-2880
4 1350-1450
6 700-960
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 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 when
related 9000 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 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 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 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).
®
VLT AutomationDrive FC 301/302 Programming Guide
~n @ 60 Hz
n
3250-3460
1625-1730
840-1153
MG33MH02 - Rev. 2013-09-30
1-44 d-axis Inductance Sat. (LdSat)
Range: Function:
Size related [0 - This parameter corresponds to the
*
1000 inductance saturation of Ld. Ideally; this
mH] 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 the nominal
value here.
1-45 q-axis Inductance Sat. (LqSat)
Range: Function:
Size related [0 - This parameter corresponds to the
*
1000 inductance saturation of Lq. Ideally; this
mH] 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 the nominal
value 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.
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,
2
P = P - R * I . This means that it is important to have the
shaft m s
correct R value. The R value in this formula is equal to the
s s
power loss in both the motor, the cable and the frequency
converter. Sometimes it is not possible to adjust 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
ensuring the optimal torque estimate and thereby optimal
performance.
Option:
[0]
[1]
[2]
value when it starts,
s
Function:
Off
1st Calibrates at the first
start start-up after power
after up and keeps this
pwr-up value until reset by a
power cycle.
Every Calibrates at every
start start-up, compen-
sating for a possible
change in motor
temperature since
last start-up.
41
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