Mitsubishi Electric FR-A700 Technical Manual page 242

2.8.3 Online auto tuning function [Pr. 95, 574]
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.
[Pr. ] Name
Online auto tuning
95
selection
Second motor online
574
auto tuning
* Magnetic flux observer is always activated under Real sensorless vector control independently of [Pr. 95, 574] setting.
(1) Start-time online auto tuning
[Pr. 95 = 1, Pr. 574 = 1]
By quickly tuning the motor constants at a start, high
accuracy operation
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.
[Pr. ]
Used as rated motor current and electronic
9
thermal relay parameters
71 Applied motor
Motor capacity
(can be set down to one rank lower than the
80
inverter capacity, note that the capacity should be
0.4kW or more)
81 Number of motor poles
5) Give the run command in the PU operation or
External operation mode.
Initial Setting
Value Range
Online auto tuning is not
0
performed
0 1 Start-time online auto tuning
Magnetic flux observer
2
(normal tuning)
Second motor online auto
0
tuning is not performed
0
Online auto tuning at
1
starting of the second motor
unaffected by the motor
Description
A700
(A700)
Advanced
Magnetic
Description
Flux Vector
Control
Invalid
*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
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.
276
PARAMETER
Real
Sensorless
Vector Control
Vector
Control
Although setting
can be made,
setting 2 is
recommended
Invalid
*
Setting is
disabled
Setting is
disabled
tuning with external terminal.