Danfoss VLT HVAC Drive FC 102 Programming Manual page 46

Parameter Descriptions
Parameter 1-40 Back EMF
at 1000 RPM
RMS (Line to Line Value )
3 3
Table 3.6 Parameters Related to PM Motors
NOTICE
Motor manufacturers provide values for stator resistance
(parameter 1-30 Stator Resistance (Rs)) and d-axis
inductance (parameter 1-37 d-axis Inductance (Ld)) in
technical specifications as between line and common
(starpoint) or between line-line. There is no general
standard. The different set-ups of stator winding
resistance and induction are shown in Illustration 3.6.
Danfoss frequency converters always require the line to
common value. The back EMF of a PM motor is defined
as induced EMF developed across any of 2 phases of
stator winding of free-running Motor-Danfoss frequency
converters always require the line to line RMS value
measured at 1000 RPM, mechanical speed of rotation.
This is shown in Illustration 3.7).
Line to common (starpoint)
Illustration 3.6 Stator Winding Set-Ups
Permanent magnet motors
Illustration 3.7 Machine Parameter Definitions of Back EMF of
PM Motors
44
This parameter gives back EMF across
stator terminal of PM Motor at 1000
RPM mechanical speed specifically. It
is defined between line-to-line and
expressed in RMS value.
Line to line values
Rs and Ld
Line to Line Back
Emf in RMS Value
at 1000 rpm
Speed (mech)
Danfoss A/S © 03/2015 All rights reserved.
®
VLT HVAC Drive FC 102
1-39 Motor Poles
Range:
Size
related
*
1-40 Back EMF at 1000 RPM
Rs and Ld
Range:
Size
related
*
1-46 Position Detection Gain
Range:
100 %
*
Function:
NOTICE
[2 -
100 ]
This parameter cannot be adjusted
while the motor is running.
Enter the number of motor poles.
Poles ~n @ 50 Hz
n
2 2700-2880
4 1350-1450
6 700-960
Table 3.7 Pole Counts and Related
Frequencies
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.
Function:
[ 10 - Set the nominal back EMF for the motor
9000 V] when running at 1000 RPM. This
parameter is only active when
parameter 1-10 Motor Construction is set
to [1] PM, non salient SPM.
Function:
[20 - 200 Adjusts the amplitude of the test pulse
%] during position detection at start. Adjust
this parameter to improve the position
measurement.
~n @ 60 Hz
n
3250-3460
1625-1730
840-1153
MG11CE02