276
PARAMETER
2.8.3
Online auto tuning function [Pr. 95, 574]
(A700)
When online auto tuning is selected under Advanced magnetic flux vector control or Real sensorless vector control, excellent
torque accuracy is provided by temperature compensation even if the secondary resistance value of the motor varies with the
rise of the motor temperature.
(1) Start-time online auto tuning
[
Pr. 95 = 1, Pr. 574 = 1
]
By quickly tuning the motor constants at a start, high
accuracy operation unaffected by the motor
temperature and stable operation with high torque
down to ultra low speed can be performed.
Set when performing start time tuning under
Advanced magnetic flux vector control or Real
sensorless vector control. It can be set under vector
control. However, it is recommended to set 2
(magnetic flux observer) under vector control.
<Operation method>
1) Perform offline auto tuning.
2) Read [
Pr. 96
] and check that the setting is either 3
or 103 (offline auto tuning completed).
3) Set [
Pr. 95 = 1
].
4) Before starting operation, check that the following
parameters have been set.
5) Give the run command in the PU operation or
External operation mode.
*1
Online auto tuning does not operate if the
MRS signal is input, if the preset frequency is
less than the [
Pr. 13 Starting frequency
], or if
the starting conditions of the inverter are not
satisfied, e.g. inverter error.
*2
Online auto tuning does not operate during
deceleration or at a restart during DC brake
operation.
*3
Invalid for Jog operation.
*4
Automatic restart after instantaneous power
failure overrides when automatic restart after
instantaneous power failure is selected.
*5
For using start-time tuning in elevator,
examine the utilization of a brake sequence
for the brake opening timing at a start or
consider tuning with external terminal.
Though the tuning ends in about a maximum
of 500ms after a start, torque is not provided
fully during that period. Therefore, note that
there may be a possibility of drop of elevator
due to gravity.
*6
Zero current detection and output current
detection are valid during online auto tuning.
*7
The RUN signal is not output during online
auto tuning. The RUN signal turns ON at a
start.
*8
If the period from an inverter stop to a restart
is within 4s, online auto tuning is performed
but the tuning results are not reflected.
A700
[Pr. ]
Name
Initial
Value
Setting
Range
Description
Advanced
Magnetic
Flux Vector
Control
Real
Sensorless
Vector
Control
Vector Control
95
Online auto tuning
selection
0
0
Online auto tuning is not
performed
{
{
{
1
Start-time online auto tuning
{
{
Although setting
can be made,
setting 2 is
recommended
2
Magnetic flux observer
(normal tuning)
Invalid
Invalid
*
{
574
Second motor online
auto tuning
0
0
Second motor online auto
tuning is not performed
{
{
Setting is
disabled
1
Online auto tuning at
starting of the second motor
{
{
Setting is
disabled
* Magnetic flux observer is always activated under Real sensorless vector control independently of [
Pr. 95, 574
] setting.
[Pr. ]
Description
9
Used as rated motor current and electronic
thermal relay parameters
71
Applied motor
80
Motor capacity
(can be set down to one rank lower than the
inverter capacity, note that the capacity should be
0.4kW or more)
81
Number of motor poles
Summary of Contents for FR-A700 Series
Page 245: ...279 2 PARAMETER PARAMETER MEMO ...
Page 440: ...474 PARAMETER MEMO ...
Page 522: ...556 SELECTION MEMO ...
