Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 212

• 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, however, 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.
• Offline auto tuning is performed.
Offline auto tuning is necessary under Real sensorless vector control even when the Mitsubishi Electric motor is used.
• Single-motor operation (one motor to one inverter) is performed.
• A surge voltage suppression filter (FR-ASF/FR-BMF) or sine wave filter (MT-BSL/BSC) is not used.
 Vector control
• With a Vector control compatible option installed, full-scale Vector control operation of a motor with encoder can be
performed. Speed control (zero speed control, servo lock), torque control, and position control can be performed with fast
response and high accuracy. With the FR-A8APR installed, Vector control operation of a motor with resolver can be
performed.
• Vector control has excellent control characteristic compared to other control methods such as V/F control. Its control
characteristic is equal to those of DC machines.
• This control method is useful for the following purposes:
- To minimize the speed fluctuation even at a severe load fluctuation
- To generate a low speed torque
- To prevent machine from damage due to a too large torque (To set the torque limit)
- To control the torque or position
- To control a torque generated in a motor in a servo-lock state (the motor with its shaft stopped)
NOTE
• Vector control requires the following conditions.
When the conditions are not satisfied, malfunctions such as insufficient torque, uneven rotation may occur.
• The rated motor current should be equal to or less than the inverter rated current. (It must be 0.4 kW or higher.)
If a motor with substantially low rated current compared with the inverter rated current, however, is used, speed and torque
accuracies may deteriorate due to torque ripples, etc. As a reference, select the motor with the rated motor current that is 40%
or higher of the inverter rated current.
• The Vector control of PM motors can be performed when a PM motor with resolver is used together with the FR-A8APR.
(Torque control is not available for a PM motor.)
• The motor described in the following table is used.
Vector control dedicated motor SF-V5RU (1500 r/min series)
Mitsubishi Electric standard motor with encoder (SF-JR)
Mitsubishi Electric high-efficiency motor with encoder (SF-HR)
Mitsubishi Electric constant-torque motor with encoder (SF-
JRCA 4P, SF-HRCA)
Other motors (motors other than SF-V5RU 1500 r/min series,
other manufactures' motors, etc.)
• Single-motor operation (one motor to one inverter) is performed.
• The wiring length from inverter to motor is 30 m or less. (When the wiring length exceeds 30 m, perform offline auto tuning with
the wiring in place.)
• A surge voltage suppression filter (FR-ASF/FR-BMF) or sine wave filter (MT-BSL/BSC) is not used.
 PM sensorless vector control
• The inverter enables highly efficient motor control and highly accurate motor speed control of a PM (permanent magnet
embedded) motor, which is more efficient than an induction motor.
• A speed detector such as an encoder is not required as the inverter estimates the motor speed by the calculation from the
inverter output voltage and current. The inverter drives the PM motor with the least required current for a load in order to
achieve the highest motor efficiency.
Motor Condition
The offline auto tuning is not required.
The offline auto tuning is required.
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5. PARAMETERS
5.2 Control method