Mitsubishi Electric FR-A800, Instruction Manual

Page: 648 / 1042

(C) Motor constant parameters Parameters
5 - 468
Magnetic flux observer (tuning always) (setting value "2")
●
If vector control is performed using a motor with an encoder, this setting improves torque
accuracy.
Estimate or measure the flux within the motor using the current running through the motor and
the inverter output voltage.
Because the flux of a motor can always be accurately estimated (even during operation), fine
characteristics can always be attained without being affected by temperature change in the
second resistance.
●
When vector control (Pr. 80, Pr. 81 or Pr. 800) is used, select the magnetic flux observer. (Refer to
page 5-56.)
NOTES Even if the start signal is turned ON during zero speed control or servo lock, tuning is performed at
startup.
The Y39 signal remains ON as long as there is second flux even after the motor is stopped.
The X28 signal is disabled while the Y39 signal is ON.
The STF and STR signals are enabled after completing tuning at start.
The Inverter running (RUN) signal is not turned ON during online auto tuning. The RUN signal is
turned ON after starting up.
It is disabled during V/F control or PM sensorless vector control.
Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) and
Pr. 190 to Pr. 196 (output terminal function selection) may affect other functions. Set parameters
after confirming the function of each terminal.
NOTE Offline auto tuning is not necessary if selecting magnetic flux observer for SF-V5RU, SF-JR (with
encoder), SF-HR (with encoder), SF-JRCA (with encoder) or SF-HRCA (with encoder). (However,
when the wiring length is long (30 m or longer as a reference), perform offline auto tuning so that
the resistance arises in the long wiring can be reflected to the operation.)