Learning Advanced Features
measured with static auto tuning may be less accurate. Inaccuracy of the measured parameters
may degrade the performance of sensorless operation. Therefore, run static type auto tuning by
selecting 2 (All) only when the motor cannot be rotated (when gearing and belts cannot be
separated easily, or when the motor cannot be separated mechanically from the load).
• In PM synchronous motor sensorless control mode, check the motor’s rating plate and enter the
motor specifications, such as the base frequency, pole number, rated current and voltage, and
efficiency, before performing auto tuning and detecting other motor parameters by setting bA.20
(Auto Tuning) to 7 [All (PM)]. The detected parameter values may not be accurate if the motor’s base
specifications are not entered.
5.10 Sensorless Vector Control for Induction Motors
Sensorless vector control is an operation to carry out vector control without the rotation speed
feedback from the motor but with an estimation of the motor rotation speed calculated by the
inverter. Compared to V/F control, sensorless vector control can generate greater torque at a lower
level of current.
Depends on the
motor capacity
Depends on the
motor capacity
Depends on the
motor capacity
Depends on the
motor capacity
Depends on the
motor capacity
Sensorless second gain
display setting
controller proportional
motor capacity
Sensorless speed
controller integral gain 1
Depends on the
motor capacity
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