Omron 3G3MX2 User Manual page 264

5-11 Sensorless Vector Control
When vector control is performed using a motor whose motor parameters are unknown, perform
offline auto-tuning to measure the motor parameters.
The motor parameters correspond to data on one phase of Y-connection at 50 Hz.
Adjust the settings of Base Frequency (A003/A203) and Motor Incoming Voltage Selection (A082/
A282) to the specifications of the motor to be measured. If the applicable motor voltage is not
available among the options for Motor Incoming Voltage Selection, set the output voltage gain so
that "Motor Incoming Voltage (A082/A282) × Output Voltage Gain (A045/A245) = Rated Motor
Voltage" is established.
The motor parameters can be determined for motors with the maximum applicable capacity or
subsequent lower capacity. For motors with other capacities, the Inverter may not correctly
determine the motor parameters. (In some cases, auto-tuning may not be completed. In this case,
pressing the STOP/RESET key displays an abort message.)
Set Internal DC Injection Braking Selection (A051) and Simple Position Control Selection (P012)
to "00: Disabled." If they are set to "01: Enabled," measurement is not performed correctly.
Turn OFF the Torque reference input permission (52: ATR). If it is ON, measurement is not
performed correctly.
When performing auto-tuning while the motor is rotating, take note of the following items:
1) There will be no problem even if the motor accelerates up to near 80% of the base frequency.
2) The motor is not driven by external equipment.
3) The brake is released.
4) The torque is not sufficient during auto-tuning. In the case of a lift, etc. the system may "slip and
5
5) In the case of a machine whose motor shaft rotations are limited (lift, ball screw, etc.), the motor
6) No-load current Io can also be checked by the current monitor function as the current during no-
Even when H001 = 01 (Motor does not rotate), the motor may still rotate slightly.
To perform auto-tuning for a motor with the subsequent lower capacity, enable Overload Limit
Selection (b021/b221b024) and set Overload Limit Level (b022/b222) to 1.5 times larger than the
rated current of the motor.
If the value of Overvoltage Suppression Integral Time (b134) is small, an Overvoltage Trip (E07)
may occur at an auto-tuning.
In this case, increase b134 and then perform auto-tuning again.
5-147
fall." Accordingly, remove the motor from the loaded machine and perform auto-tuning for the
motor alone.
(Here, moment of inertia J applies to the motor alone. Accordingly, add the motor-shaft
converted value of the moment of inertia of the loaded machine.)
may rotate exceeding the allowable rotation and the machine may be damaged as a result.
Accordingly, select "01: Enabled (Motor does not rotate)" in H001.
load, 50-Hz operation at V/f setting.
Also, the setting obtained by auto-tuning (with the motor rotating) can be rewritten (H023/H223)
to the monitored value. It can be rewritten to the monitored value after executing auto-tuning
(with the motor rotating).
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-A@@@@)