Mitsubishi Electric FR-A800 Series Instruction Manual page 282

NOTE
• During Real sensorless vector control, offline auto tuning must be performed properly before starting operations.
• The carrier frequency is limited during Real sensorless vector control. (Refer to
• Torque control is not available in a low-speed (about 10 Hz or lower) regenerative range, or with a low speed and light load
(about 5 Hz or lower and rated torque about 20% or lower).
• Performing pre-excitation (LX signal and X13 signal) under torque control may start the motor running at a low speed even
when the start signal (STF or STR) is not input. The inverter at a start command ON may also rotate the motor at a low speed
even though a speed limit value is set to 0. Confirm that the motor running does not cause any safety problem before
performing pre-excitation.
• Switching between the forward rotation command (STF) and reverse rotation command (STR) must not be performed during
operations under torque control. An overcurrent trip (E.OC[]) or opposite rotation deceleration fault (E.11) will occur.
• When performing continuous operations under Real sensorless vector control in the FR-A820-00250(3.7K) or lower or FR-
A840-00126(3.7K) or lower, the speed fluctuation increases when the value is 20 Hz or less, and in the low-speed range of
less than 1 Hz, there may be torque shortage. In such case, stop the inverter and restart it to improve the situation.
• If starting may occur while the motor is coasting under Real sensorless vector control, the frequency search must be set for
the automatic restart after instantaneous power failure function (Pr.57 ≠ "9999", Pr.162 = "10").
• When Real sensorless vector control is applied, there may not be enough torque provided in the ultra low-speed range of about
2 Hz or lower.
Generally, the speed control range is as follows.
For power driving, 1:200 (2, 4 or 6 poles) (available at 0.3 Hz or higher when the rating is 60 Hz), 1:30 (8 poles or more)
(available at 2 Hz or higher when the rating is 60 Hz).
For regenerative driving, 1:12 (2 to 10 poles) (available at 5 Hz or higher when the rating is 60 Hz).
• To give the constant torque command in the constant output range, set "1 or 11" in Pr.803 Constant output range torque
characteristic selection. (Refer to
• For the settings for the SF-V5RU, refer to
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283.)
page 94.
5.4 Torque control under Real sensorless vector control and Vector control
page 356.)
5. PARAMETERS
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