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Selection and protection of a motor
4
PARAMETERS
(1) Before performing offline auto tuning
Check the following before performing offline auto tuning.
· Make sure Advanced magnetic flux vector control (Pr. 80, Pr. 81), Real sensorless vector control or vector control
(Pr. 800) is selected.
· A motor should be connected. Note that the motor should be at a stop at a tuning start.
· The motor capacity should be equal to or one rank lower than the inverter capacity. (note that the capacity is 0.4kW
or higher)
·
Motors such as high-slip motor, high-speed motor and special motor cannot be tuned. (The maximum frequency is 120Hz.)
· Even if tuning is performed without motor running (Pr. 96 Auto tuning setting/status = "1"), the motor may run slightly.
Therefore, fix the motor securely with a mechanical brake, or before tuning, make sure that there will be no
problem in safety if the motor runs. (Caution is required especially in vertical lift applications). Note that if the motor
runs slightly, tuning performance is unaffected.
·
Note the following when selecting offline auto tuning performed with motor running (
Pr. 96 Auto tuning setting/status
= "101").
Torque is not enough during tuning.
The motor may be run at nearly its rated speed.
The mechanical brake is open.
No external force is applied to rotate the motor.
· Offline auto tuning will not be performed properly if it is performed with a surge voltage suppression filter (FR-ASF-
H/FR-BMF-H) connected to the 55K or lower and sine wave filter (MT-BSL/BSC) connected to the 75K or higher
between the inverter and motor. Remove it before starting tuning.
· When exercising vector control, use the encoder that is coupled directly to the motor shaft without looseness.
Speed ratio should be 1:1.
POINT
· This function is valid only when a value other than "9999" is set in Pr. 80 and Pr. 81 and Advanced magnetic flux
vector control, Real sensorless vector control or vector control is selected.
· You can copy the offline auto tuning data (motor constants) to another inverter with the PU (FR-DU07/FR-PU07).
· Even when motors (other manufacturer's motor, SF-JRC, SF-TH, etc.) other than Mitsubishi standard motor (SF-
JR 0.4kW or higher), high efficiency motor (SF-HR 0.4kW or higher), Mitsubishi constant-torque motor (SF-JRCA
4P, SF-HRCA 0.4kW to 55kW) and vector control dedicated motor (SF-V5RU (1500r/min series)) are used or the
wiring length is long (30m or more as a reference), using the offline auto tuning function runs the motor with the
optimum operating characteristics.
· Tuning is enabled even when a load is connected to the motor. (As the load is lighter, tuning accuracy is higher.
Tuning accuracy does not change even if the inertia is large.)
· For the offline auto tuning, you can select either the motor non-rotation mode (Pr. 96 = "1") or rotation mode (Pr. 96
= "101").
· The rotation mode has higher tuning accuracy than the non-rotation mode.
· Reading/writing/copy of motor constants tuned by offline auto tuning are enabled.
· The offline auto tuning status can be monitored with the PU (FR-DU07/FR-PU07/FR-PU04).
· Do not connect a surge voltage suppression filter (FR-ASF-H/FR-BMF-H) to the 55K or lower and sine wave filter (MT-
BSL/BSC) to the 75K or higher between the inverter and motor.