Signal Loss Detection Of Encoder Signals - Mitsubishi Electric FR-A800 Series Instruction Manual

 Magnetic flux observer (continuous tuning) (Pr.95/Pr.574 = "2")
• Performing Vector control with a motor with encoder improves the torque accuracy. Estimate or measure the flux within
the motor using the current running through the motor and the inverter output voltage. Since the flux of a motor can be
accurately estimated continuously (even during operation), optimum characteristics can be obtained without being affected
by temperature change in the second resistor.
• Under Vector control (Pr.80, Pr.81, Pr.800), select the magnetic flux observer.
NOTE
• Offline auto tuning is not necessary when magnetic flux observer is selected 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 motor (Pr.574)
• When one inverter switches the operation between two different motors, set the second motor in Pr.450 Second applied
motor. (In the initial setting, no second motor is applied. (Refer to
• Perform tuning using Pr.574 Second motor online auto tuning.
• Pr.574 is enabled when the Second function selection (RT) signal is turned ON.
450
453
454
*1 If a motor with substantially low rated current compared with the inverter rated 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 inverter rated current.
NOTE
• The RT signal is the Second function selection signal. The RT signal also enables other second functions. (Refer to
The RT signal is assigned to terminal RT in the initial status. Set "3" in one 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.
Parameters referred to
Pr.9 Electronic thermal O/L
Pr.71 Applied motorpage 528
Pr.80 Motor capacitypage
Pr.81 Number of motor
Pr.96 Auto tuning
Pr.178 to Pr.189 (Input terminal function
Pr.190 to Pr.196 (Output terminal function
Pr.800 Control method

5.13.6 Signal loss detection of encoder signals

Magnetic flux Vector
V/F V/F V/F Magnetic flux Magnetic flux
Signal loss detection (E.ECT) is turned ON to shut off the inverter output when the encoder signal is lost during encoder
feedback control or orientation control operation or under Vector control.
Signal loss detection (E.ECA) is activated to shut off the inverter output when the machine end encoder signal is lost during
machine end orientation control.
Pr.
376 855
*1
C148 C248
*1 The setting is available when a Vector control compatible plug-in option is installed.
*2 These parameters are available when the control terminal option (FR-A8TP) is installed.
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Pr.
Applied motor
Motor capacity (with the rated motor current equal to or less than the inverter rated current)
Number of motor poles
relaypage 415
221, page 532, page 551
polespage 221, page 532,
setting/statuspage 532, page 551
selection)page 521
selection)page 473
selectionpage 221
Vector Vector
Name
Encoder signal loss
detection enable/
*2
disable selection
search engine
page
page 551
Initial value Setting range
0
0
1
528.))
Description
Description
Signal loss detection disabled
Signal loss detection enabled
5.13 (C) Motor constant parameters
1
2
3
4
5
6
*1
7
8
page 521.)
9
10
561
5. PARAMETERS