Specification Comparison Between Pm Sensorless Vector Control And Induction Motor Control - Mitsubishi Electric FR-A800 Series Instruction Manual

9.4
Item
Applicable motor
Starting torque
Zero speed
Carrier frequency
Automatic restart after
instantaneous power failure
Startup delay
Driving by the commercial
power supply
Operation during coasting
Torque control
Position control
*1 For the motor capacity, the rated motor current should be equal to or less than the rated inverter current. (It must be 0.4 kW or higher.)
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
• Before wiring, make sure that the motor is stopped. Otherwise you may get an electric shock.
• Never connect an IPM motor to the commercial power supply.
• No slippage occurs with an IPM motor because of its characteristic. If an IPM motor, which took over an induction motor, is
driven at the same speed as for the general-purpose motor, the running speed of the IPM motor becomes faster by the amount
of the general-purpose motor's slippage. Adjust the speed command to run the IPM motor at the same speed as the induction
motor, as required.
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Specification comparison between PM sensorless
vector control and induction motor control
PM sensorless vector control (MM-CF)
IPM motor MM-CF series (0.5 to 7.0 kW) (Refer to
IPM motors other than MM-CF (tuning required)
High frequency superposition
control
Current synchronization
operation
High frequency superposition
control
Current synchronization
operation
High frequency superposition
control
Current synchronization
operation
No startup delay time.
Using the regeneration avoidance function or retry function together
is recommended.
Startup delay of about 0.1 second for magnetic pole position
detection.
Cannot be driven by the commercial power supply.
While the motor is coasting, potential is generated across motor
terminals.
Not available
High frequency superposition
control
Current synchronization
operation

9.4 Specification comparison between PM sensorless vector control and induction motor control

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page 833.)
*1
200% (when used with MM-CF,
200% for the 1.5 kW or lower, and
150% for the 2.0 kW or higher)
50%
Available (Select the HD rating for
zero speed 200%.)
Not available
6 kHz (Pr.72 = "0 to 9"),
10 kHz (Pr.72 = "10 to 13"),
14 kHz (Pr.72 = "14 or 15")
(6 kHz in a low-speed range of 10
kHz or higher.
2 kHz is not selectable.)
2 kHz (Pr.72 = "0 to 5"),
6 kHz (Pr.72 = "6 to 9"),
10 kHz (Pr.72 = "10 to 13"),
14 kHz (Pr.72 = "14 or 15")
(6 kHz in a low-speed range of 10
kHz or higher.)
Available (sensorless)
Not available
Induction motor control
*1
Induction motor
200% (FR-A820-00250(3.7K) or
lower and FR-A840-00126(3.7K)
or lower).
150% (FR-A820-00340(5.5K) or
higher and FR-A840-00126(3.7K)
or higher) under Real sensorless
vector control and Vector control.
Available under Real sensorless
vector control and Vector control
Any value in the range of 0.75
kHz to 14.5 kHz
(FR-A820-03160(55K) or lower
and FR-A840-01800(55K) or
lower)
0.75 kHz to 6 kHz
(FR-A820-03800(75K) or higher,
FR-A840-02160(75K) or higher)
Startup waiting time exists.
No startup delay (when online
auto tuning is not performed at
startup).
Can be driven by the commercial
power supply. (Other than vector
control dedicated motor.)
While the motor is coasting,
potential is not generated across
motor terminals.
Available under Real sensorless
vector control and Vector control
Available under Vector control.
9. APPENDIX
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