(C) Motor constant parameters
462
PARAMETERS
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 164.)
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.)
Tuning the second applied motor (Pr.574)
• When switching two different motors by one inverter, set the second motor in Pr.450 Second applied motor. (In the initial
setting, no second motor is applied. (Refer to page 438.))
Pr.574 is enabled when the Second function selection (RT) signal is turned ON.
If a motor with substantially low rated current compared with the rated inverter current is used, speed and torque accuracies may deteriorate due
to torque ripples, etc. Set the rated motor current to about 40% or higher of the rated inverter current.
NOTE
• The RT signal is a second function selection signal. The RT signal also enables other second functions. (Refer to page 430.)
The RT signal is assigned to the terminal RT in the initial status. Set "3" in any of Pr.178 to Pr.189 (input terminal function
selection) to assign the RT signal to another terminal.
• Changing the terminal assignment using Pr.178 to Pr.189 (input terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
Pr.9 Electronic thermal O/L relay page 331
Pr.71 Applied motor page 438
Pr.80 Motor capacity page 164, page 442, page 452
Pr.81 Number of motor poles page 164, page 442, page 452
Pr.96 Auto tuning setting/status page 442, page 452
Pr.178 to Pr.189 (input terminal function selection) page 430
Pr.190 to Pr.196 (output terminal function selection) page 384
Pr.800 Control method selection page 164
5.13.5 Signal loss detection of encoder signals
The setting is available only when the FR-A8AP (option) is mounted.
Pr. Description
450 Applicable motor
453 Motor capacity (with the rated motor current equal to or lower than the rated inverter current)
454 Number of motor poles
If encoder signals are disconnected during encoder feedback control, orientation control or vector control, Signal loss
detection (E.ECT) is turned ON to shut off the inverter output.
Pr. Name Initial value Setting range Description
376
C148
Encoder signal loss detection
enable/disable selection
0
0 Signal loss detection disabled
1 Signal loss detection enabled
V/F
V/F
Magnetic flux
Magnetic flux
Vector
Vector
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