Mitsubishi Electric 800 Series Instruction Manual page 416

17.2
Specification comparison between PM sensorless
vector control and induction motor control
Item
Applicable motor IPM motor or SPM motor
Starting torque 50%
Startup delay of about 0.1 s for magnetic pole position
Startup delay
detection.
Driving by the
commercial Cannot be driven by the commercial power supply.
power supply
Operation during While the motor is coasting, potential is generated across
coasting motor terminals.
Torque control Not available
*1 For the motor capacity, the rated motor current should be equal to or less than the rated inverter current. (Note that the motor rated current should
be 0.4 kW or higher (0.1 kW or higher for the 200 V class).)
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 a PM motor to a commercial power supply.
• No slippage occurs with a PM 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.
PM sensorless vector control
*1
17.2 Specification comparison between PM sensorless vector control and induction motor control
Induction motor control
*1
Induction motor
200% (FR-E820-0175(3.7K) or lower, FR-E840-
0095(3.7K) or lower, FR-E860-0061(3.7K) or lower, FR-
E820S-0110(2.2K) or lower) and
150% (FR-E820-0240(5.5K) or higher, FR-E840-
0120(5.5K) or higher, FR-E860-0090(5.5K) or higher)
under Real sensorless vector control
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.
Real sensorless vector control
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15
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19
20
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17.Appendix