Mitsubishi Electric FR-A800, Instruction Manual

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Parameters (A) Application parameters
FR-A800 5 - 575
Offline auto tuning when performing a frequency search by V/F control
(reduced impact restart)
When the frequency search (reduced impact restart) is selected by setting Pr. 162 "Automatic restart
after instantaneous power failure selection" = "3 or 13", perform offline auto tuning.
Before executing offline auto tuning
Check the following points before performing offline auto tuning:
●
V/F control or PM sensorless vector control (IPM motor MM-CF) is selected.
●
A motor is connected. (The motor should not be rotated by the external force applied from outside
during the tuning.)
●
The motor with the rated motor current equal to or less than the rated inverter current is used. (It
must be 0.4 kW or higher.)
If a motor with substantially low rated current compared with the rated inverter current is used,
speed and torque accuracies may deteriorate due to torque ripples, etc. Set the rated motor
current to about 40% or higher of the rated inverter current.
●
The target motor is other than a high-slip motor, a high-speed motor, or a special motor.
●
The motor may run slightly without actually turning during offline auto-tuning (Pr. 96 "Auto
tuning setting/status" = "11"), so either firmly secure the motor by the mechanical brake or check
to see if turning the motor will cause any safety problems. (Attention is required for lifts, in
particular.) The motor turning slightly will not affect tuning performance.
●
Offline auto tuning is not performed correctly when the surge voltage suppression filter
(FR-ASF-H/FR-BMF-H) and sine wave filter (MT-BSL/BSC) are inserted between the inverter and
motor. Be sure to remove them before performing tuning.
Setting
Set Pr. 96 "Auto tuning setting/status" = "11".
Set the rated motor current (initial value is inverted rated current) to Pr. 9 "Electronic thermal O/L
relay". (Refer to page 5-292.)
Set Pr. 71 "Applied motor" according to the motor to be used.
Motor Pr. 71 setting
Mitsubishi standard motor
Mitsubishi high-efficiency motor
SF-JR and SF-TH 0 (3, 4)
SF-JR 4P 1.5 kW or lower 20 (23, 24)
SF-HR 40 (43, 44)
Others 0 (3, 4)
Mitsubishi constant-torque motor
SF-JRCA 4P
SF-TH (constant-torque)
1 (13, 14)
SF-HRCA 50 (53, 54)
Other (SF-JRC, etc.) 1 (13, 14)
Mitsubishi high-performance energy-
saving motor
SF-PR 70 (73, 74)
Other manufacturer's standard
motor
⎯
0 (3, 4)
Other manufacturer's constant-
torque motor
⎯
1 (13, 14)
Tab. 5-246: Motor selection