Mitsubishi Electric 800 Series Instruction Manual (Function page 100

NOTE
• Real sensorless vector control requires the following conditions.
If these conditions are not satisfied, select V/F control. Otherwise, malfunctions such as insufficient torque, uneven rotation
may occur.
• 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.
• Offline auto tuning is performed.
Offline auto tuning is required under Real sensorless vector control even when the Mitsubishi Electric motor is used since the
wiring length affects the operation.
• Single-motor operation (one motor to one inverter) is performed.
• A surge voltage suppression filter (FR-ASF/FR-BMF) is not used.
 Vector control
• With a vector control option (FR-A8AP E kit) installed, full-scale vector control operation of a motor with an 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.
• 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
• A vector control option (FR-A8AP E kit) needs to be installed to perform Vector control. The FR-A8AP E kit cannot be used
with another plug-in option, as two or more plug-in options cannot be installed to the FR-E800 inverter at the same time.
• 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.
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.
• An induction motor is used. (Vector control is not available for a PM (IPM/SPM) motor.)
• The motor described in the following table is used.
Mitsubishi Electric high-performance energy-saving motor with encoder
(SF-PR-SC)
Mitsubishi Electric Vector control dedicated motor (SF-V5RU (1500 r/
min series))
Mitsubishi Electric inverter-driven geared motor for encoder feedback
control (GM-DP)
Mitsubishi Electric standard efficiency 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)
Mitsubishi Electric inverter-driven geared motor for encoder feedback
control (GM-DZ)
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) is not used.
Motor Condition
The offline auto tuning is not required.
The offline auto tuning is required.
4. Control Method
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