Danfoss VLT AHF 005 Programming Guide

Parameter 1-40 Back EMF
at 1000 RPM
RMS (Line to Line Value )
This parameter gives back EMF across
stator terminal of PM Motor at 1000
RPM mechanical speed specically. It
is dened between line-to-line and
expressed in RMS value.
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 specications as between line and common
(starpoint) or between line-line. There is no general
standard. The dierent 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 dened
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)
Line to line values
Rs and Ld
Rs and Ld
130BC008.11
Illustration 3.6 Stator Winding Set-Ups
Permanent magnet motors
130BC009.10
Line to Line Back
Emf in RMS Value
at 1000 rpm
Speed (mech)
Illustration 3.7 Machine Parameter Denitions of Back EMF of
PM Motors
1-39 Motor Poles
Range: Function:
Size
related*
[2 -
100 ]
NOTICE
This parameter cannot be adjusted
while the motor is running.
Enter the number of motor poles.
Poles ~n
n
@ 50 Hz ~n
n
@ 60 Hz
2 2700-2880 3250-3460
4 1350-1450 1625-1730
6 700-960 840-1153
Table 3.7 Pole Counts and Related
Frequencies
Table 3.7 shows the number of poles for
normal speed ranges of various motor types.
Dene 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: Function:
Size
related*
[ 10 -
9000 V]
Set the nominal back EMF for the motor
when running at 1000 RPM. This
parameter is only active when
parameter 1-10 Motor Construction is set
to [1] PM, non salient SPM.
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.
Parameter Descriptions
VLT
®
HVAC Drive FC 102
44 Danfoss A/S © 03/2015 All rights reserved. MG11CE02
33

Danfoss VLT AHF 005 Specifications

General

Brand	Danfoss
Model	VLT AHF 005
Category	DC Drives
Language	English