Mitsubishi Electric FR-A720-0.4K Instruction Manual page 194

Selection and protection of a motor
(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 more)
The maximum frequency is 120Hz.
·
Motors such as high-slip motor, high-speed motor and special motor cannot be tuned.
·
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 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) connected to the 55K or less and sine wave filter (MT-BSL/BSC) connected to the 75K or more 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.
(2) Setting
1) Select the advanced magnetic flux vector control, real sensorless vector control or vector control (refer to page 91 ).
2) Set "1" or "101" in Pr. 96 Auto tuning setting/status .
When the setting is "1" . . . . . . . . Tuning is performed without motor running.
·
· When the setting is "101" . . . . . . Tuning is performed without motor running.
3) Set the rated motor current (initial value is rated inverter current) in Pr. 9 Electronic thermal O/L relay (refer to page 176 ).
4) Set the rated voltage of motor (initial value is 200V/400V) in Pr. 83 Motor rated voltage and rated frequency of motor
(initial value is 60Hz) in Pr. 84 Rated motor frequency .
(For a Japanese standard motor, etc. which has both 50Hz and 60Hz rated values, set 200V/60Hz or 400V/
60Hz).)
5) Set Pr. 71 Applied motor according to the motor used.
Mitsubishi standard
motor
Mitsubishi high efficiency
motor
Mitsubishi constant-
torque motor
Vector control dediated
motor
Other manufacturer's
standard motor
Other manufacturer's
constant torque motor
* For other settings of Pr. 71 , refer to page 179.
184
It takes approximately 25 to 120s
(Excitation noise is produced during tuning.)
*Tuning time differs according to the inverter capacity and motor type.
It takes approximately 40s until tuning is completed.
The motor runs at nearly its rated frequency.
Motor
SF-JR, SF-TH
SF-JR 4P-1.5kW or less
SF-HR
Others
SF-JRCA 200V 4P,
SF-TH (constant torque)
SF-HRCA 200V 4P
Others (SF-JRC, etc.)
SF-V5RU
SF-THY
−
−
until tuning is completed.
*
Pr. 71 Setting
*
3
23
43
3
13
53
13
33
3
13