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Selection and protection of a motor
(2) Magnetic flux observer (normal tuning) (Pr. 95 = "2")
· When exercising vector control using a motor with encoder, it is effective for torque accuracy improvement.
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 (including during operation) detected with high accuracy so that an
excellent characteristic is provided regardless of the change in the temperature of the secondary resistance.
· Vector control (Pr. 80, Pr. 81, Pr. 800) should be selected. (Refer to page 92.)
CAUTION
· For the SF-V5RU, SF-JR (with encoder), SF-HR (with encoder), SF-JRCA (with encoder) or SF-HRCA (with encoder), 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 for the wiring length resistance to be reflected on the control when the wiring length is long (30m or longer as
reference)).
REMARKS
· Online auto tuning does not operate if the MRS signal is input, if the preset speed is less than the Pr. 13 Starting frequency (V/F
control or Advanced magnetic flux vector control), or if the starting conditions of the inverter are not satisfied, e.g. inverter error.
· Online auto tuning does not operate during deceleration or at a restart during DC brake operation.
· Invalid for jog operation.
· Automatic restart after instantaneous power failure overrides when automatic restart after instantaneous power failure is selected.
(Start-time online auto tuning is not performed at frequency search.)
Perform online auto tuning at a stop with the X28 signal when using automatic restart after instantaneous power failure together.
(Refer to the following for details.)
· Zero current detection and output current detection are valid during online auto tuning.
· The RUN signal is not output during online auto tuning. The RUN signal turns ON at a start.
· If the period from an inverter stop to a restart is within 4s, start-time tuning is performed but the tuning results are not reflected.