Offline Auto Tuning - Mitsubishi Electric A800 Plus Series Function Manual

3.4.2

Offline auto tuning

Before performing offline auto tuning
Check the following points before performing offline auto tuning:
• 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 (with Pr.800).
• A motor is connected. (Check that the motor is not rotated by an external force during tuning.)
• The motor capacity is equal to or one rank lower than the inverter capacity. (It must be 0.4 kW or higher.)
Using a motor with the rated current substantially lower than the rated inverter current will cause torque ripples, etc. and
degrade the speed and torque accuracies. As a reference, select the motor with the rated motor current that is 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 highest frequency is 400 Hz.
• The motor may rotate slightly even if the offline auto tuning without motor rotation (Pr.96 Auto tuning setting/status = "1")
is selected. (The slight motor rotation does not affect the tuning performance.) 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.)
• Check the following points for the offline auto tuning with motor rotation (Pr.96 Auto tuning setting/status = "101").
Torque is not sufficient during tuning.
The motor can be rotated up to the speed close to the rated speed.
The mechanical brake is released.
• Offline auto tuning is not performed correctly when the surge voltage suppression filter (FR-ASF-H/FR-BMF-H) is inserted
between the inverter and motor. Be sure to remove them before performing tuning.
• Make sure to connect the encoder to the motor without coaxial misalignment during vector control. Set the speed ratio to
1:1.
Setting
• To perform tuning, set the following parameters about the motor.
First Second
motor motor
Pr. Pr.
80 453 Motor capacity
81 454 Number of motor poles
800 451 Control method selection 20
Electronic thermal O/L
9 51
relay
83 456 Rated motor voltage
84 457 Rated motor frequency
71 450 Applied motor
Auto tuning setting/
96 463
status
∗1
Differs according to the voltage class. (200 V/400 V)
∗2
For the details to set SF-V5RU, refer to the FR-A800 Instruction Manual (Detailed).
∗3
Set Pr.71 Applied motor according to the motor to be used and the motor constant setting range. According to the Pr.71 setting, the range of
the motor constant parameter setting values and units can be changed.
Parameter setting procedure for dancer feedback speed control
Name Initial value
9999 (V/F control)
9999 (V/F control)
Inverter rated current Set the rated motor current (A).
200 V/400 V
∗1
9999
0 (standard motor)
0
Description
Set the motor capacity (kW).
Set the number of motor poles (2 to 12).
Set this parameter when using vector control or Real
sensorless vector control.
Set the rated motor voltage (V) printed on the motor's rating
plate.
∗2
Set the rated motor frequency (Hz).
When the setting is "9999", the Pr.3 Base frequency setting is
used.
Set this parameter according to the motor.
Three types of motor constant setting ranges, units and tuning
data can be stored according to settings.
Set "1" or "101".
1: Performs tuning without rotating the motor. (Excitation noise
occurs at this point.)
101: Performs tuning by rotating the motor. The motor can
rotate up to the speed near the rated motor frequency.
DANCER FEEDBACK SPEED CONTROL
∗2
∗3
49
3