Mitsubishi Electric FR-A800 Series Instruction Manual page 640

*3 For the FR-A820-03800(75K) or higher, and FR-A840-02160(75K) or higher.
 Offline auto tuning for a frequency search (reduced impact restart)
• When an induction motor is used and the frequency search (reduced impact restart) is selected by setting Pr.162
Automatic restart after instantaneous power failure selection = "3, 13, 1003, or 1013", perform offline auto tuning.
• When the MM-CF motor is used and the automatic restart after instantaneous power failure is selected, it is recommended
that offline auto tuning is performed.
 Before performing offline auto tuning
Check the following points before performing offline auto tuning:
• Check that V/F control or PM sensorless vector control (IPM motor MM-CF) is selected.
• Check that a motor is connected. (Check that the motor is not rotated by an external force during tuning.)
• Select a motor with the rated current equal to or less than the inverter rated current. (The motor capacity must be 0.4 kW
or higher.)
If a motor with substantially low rated current compared with the inverter rated 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 inverter
rated current.
• The target motor is other than a high-slip motor, a high-speed motor, or a special motor.
• The motor may rotate slightly even if the offline auto tuning without motor rotation (Pr.96 Auto tuning setting/status =
"11") is selected. Fix the motor securely with a mechanical brake, or before tuning, make sure that it is safe even if the
motor rotates. (Caution is required especially in vertical lift applications.) Note that even if the motor runs slightly, tuning
performance is unaffected.
• 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
1.
Set "11" in Pr.96 Auto tuning setting/status.
2.
Set the rated motor current (initial value is inverted rated current) in Pr.9 Electronic thermal O/L relay. (Refer to
page
3.
Set Pr.71 Applied motor according to the motor to be used.
Mitsubishi Electric standard motor
Mitsubishi Electric high-efficiency motor
Mitsubishi Electric constant-torque motor
Mitsubishi Electric high-performance energy-
saving motor
Other manufacturer's standard motor
Other manufacturer's constant-torque motor
 Performing tuning
• Before performing tuning, check the monitor display of the operation panel or parameter unit if the inverter is in the state ready
for tuning. The motor starts by turning ON the start command while tuning is unavailable.
• In the PU operation mode, press
For External operation, turn ON the start command (STF signal or STR signal). Tuning starts. (At this time, excitation noise
occurs.)
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415.)
Motor
SF-JR, SF-TH
SF-JR 4P 1.5 kW or lower
SF-HR
Others
SF-JRCA 4P,
SF-TH (constant-torque)
SF-HRCA
Others (SF-JRC, etc.)
SF-PR
—
—
/
search engine
on the operation panel.
Pr.71 setting
0 (3, 4)
20 (23, 24)
40 (43, 44)
0 (3, 4)
1 (13, 14)
50 (53, 54)
1 (13, 14)
70 (73, 74)
0 (3, 4)
1 (13, 14)
5. PARAMETERS
5.14 (A) Application parameters
1
2
3
4
5
6
7
8
9
10
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