And Induction Motor Control - Mitsubishi Electric FR-A820-00046 Instruction Manual

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Specification comparison between PM sensorless vector control and induction motor control
A.2
Specification comparison between PM sensorless vector
control and induction motor control
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
Tab. A-2:
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 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.
NOTES
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 run-
ning speed of the IPM motor becomes faster by the amount of the general-purpose motor's slip-
page. Adjust the speed command to run the IPM motor at the same speed as the induction motor,
as required.
A - 4
PM sensorless vector control (MM-CF)
IPM motor MM-CF series (0.5 to 7.0 kW)
(Refer to page 8-8.)
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 waiting time.
Using the regeneration avoidance function or retry function
together is recommended.
Startup delay of about 0.1 s 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
Differences between PM sensorless vector control and induction motor control
200% (200% for the 1.5 kW or
lower with MM-CF, 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
Appendix
Induction motor control
Induction motor
200% (FR-A820-00250(3.7K) or lower
and FR-A840-00126(3.7K) or lower)
150% (5.5K 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
and 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.

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