Mitsubishi Electric 800 Series Instruction Manual page 456

 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, 13, 1003, or 1013", perform offline auto tuning.
 Before executing offline auto tuning
Check the following points before performing offline auto tuning:
• V/F control 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 inverter rated current is used. (It 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 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.
 Setting
1.
Set Pr.96 Auto tuning setting/status = "11".
2.
Set the rated motor current (initial value is inverted rated current) to Pr.9 Electronic thermal O/L relay. (Refer to
page 230.)
3.
Set Pr.71 Applied motor according to the motor to be used.
Motor
Standard motor
Constant-torque 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 the parameter unit if the
inverter is in the state ready for tuning. Turning ON the start command while tuning is unavailable starts the
motor.
• In the PU operation mode, press
(STF signal or STR signal). Tuning will start. (At this time, excitation noise occurs.)
Pr.71 setting
0 (3, 4)
1 (13, 14)
0 (3, 4)
1 (13, 14)
/ on the operation panel. For External operation, turn ON the start command
5. PARAMETERS
5.11 (A) Application parameters
3
4
5
5
5
6
7
8
9
10
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