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Online auto tuning
CONTROL
4
4.6 Online auto tuning
4.6.1 Parameters
• For the motor with PLG, set "2" in Pr. 95 "online auto tuning selection".
4.6.2 Pr. 95="1" (start-time tuning)
The current at a start is detected to compensate for the secondary resistance of the motor so that excellent
characteristics are provided regardless of the change in value of the secondary resistance of the motor with the rise
of the motor temperature.
4.6.3 Pr. 95 = "2" (normal tuning)/adaptive magnetic flux observer
This function is effective for torque accuracy improvement when using the motor with PLG.
The current flowing in the motor and the inverter output voltage are used to estimate/observe the magnetic flux in
the motor.
The magnetic flux of the motor is always detected with high accuracy so that excellent characteristics are provided
regardless of the change in the temperature of the secondary resistance.
Set "2" when exercising PLG vector control.
!
Excellent torque accuracy is provided even if the secondary resistance value of the motor varies with the
rise of the motor temperature.
Parameter Name Factory Setting Setting Range Remarks
95 Online auto tuning selection 0 0, 1, 2
0: No online auto tuning
1: Start-time tuning (at start-up)
2: Adaptive magnetic flux observer (normal)
CAUTION
1. Perform offline auto tuning in the mode with rotation before performing start-time tuning of the online
auto tuning.
CAUTION
1. For the SF-V5R, SF-JR (with PLG) or SF-HRCA (with PLG), it is not necessary to perform offline auto
tuning to select adaptive magnetic flux observer. (Note that it is necessary to perform offline auto
tuning (hon-rotation mode) for the wiring length resistance to be reflected on the control when the
wiring length is long (30m or longer as reference).)
2. For using start-time tuning in vertical lift applications, examine the utilization of a brake sequence for
the brake opening timing at a start. 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
gravity drop.
REMARKS
1. Online auto tuning of the start-time tuning does not operate if the MRS is input, if the preset speed is less than the starting
speed (Pr. 13), or if the starting conditions of the inverter are not satisfied, e.g. inverter error.
2. Online auto tuning of the start-time tuning does not operate during deceleration or at a restart during DC brake operation.
3. Invalid for jog operation.
4. The RUN signal is not output during online auto tuning of the start-time tuning. The RUN signal turns on at a start.
5. If the period from an inverter stop to a restart is within 4 seconds, online auto tuning of the start-time tuning is performed
but the tuning results are not reflected.
6. Automatic restart after instantaneous power failure overrides when automatic restart after instantaneous power failure is
selected.
7. Zero current detection and output current detection are valid during online auto tuning.