shows the pole number 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 pole number,
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
related
*
[0 -
9000
V]
NOTICE
This parameter is only active when
parameter 1-10 Motor Construction
is set
to options that enable PM (permanent
magnet) motors.
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 for
example 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.
NOTICE
When using PM motors, it is
recommended to use brake resistors.
1-41 Motor Angle Offset
Range:
Function:
0
*
[-32768 -
32767 ]
NOTICE
This parameter is only active when
parameter 1-10 Motor Construction
is set to
[1] PM, non-salient SPM
(Permanent Magnet
Motor).
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 x pi (radians). To
obtain the offset angle value: After frequency
converter start-up, apply DC hold and enter the
value of
into this
parameter.
1-44 d-axis Inductance Sat. (LdSat)
Range:
Function:
Size
related
*
[0 -
1000 mH]
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.
1-45 q-axis Inductance Sat. (LqSat)
Range:
Function:
Size
related
*
[0 -
1000 mH]
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.
1-46 Position Detection Gain
Range:
Function:
120 %
*
[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
Option:
Function:
Use this parameter to optimize the torque estimate
in the full speed range. The estimated torque is
based on the shaft power, P
shaft
= P
m
- R
s
x I
2
. Make
sure that the R
s
value is correct. The R
s
value in this
formula is equal to the power loss in the motor, the
cable, and the frequency converter. When this
parameter is active, the frequency converter
calculates the R
s
value during power-up, ensuring
the optimal torque estimate and optimal
performance. Use this feature in cases when it is not
possible to adjust
parameter 1-30 Stator Resistance
on each frequency converter to compensate for
the cable length, frequency converter losses, and the
temperature deviation on the motor.
[0] Off
[1] 1st
start
after
pwr-up
Calibrates at the first start-up after power-up and
keeps this value until reset by a power cycle.
[2] Every
start
Calibrates at every start-up, compensating for a
possible change in motor temperature since last
start-up. The value is reset after a power cycle.
[3] 1st
start
with
store
The frequency converter calibrates the torque at the
first start-up after power-up. This option is used to
update motor parameters:
Parameter Descriptions
Programming Guide
MG33MP02
Danfoss A/S © 10/2018 All rights reserved.
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Summary of Contents for VLT AutomationDrive FC 302
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