Offline Auto Tuning For A Frequency Search - Mitsubishi Electric 800 Series Instruction Manual

14.9

Offline auto tuning for a frequency search

V/F V/F V/F
Under V/F control, the accuracy of the "frequency search", which is used to detect the motor speed for the automatic restart
after instantaneous power failure and flying start, can be improved.
Pr. Name
Automatic restart after
162
instantaneous power
A700
failure selection
298
Frequency search gain 9999
A711
560 Second frequency
A712 search gain
96 Auto tuning setting/
C110 status
90
Motor constant (R1)
C120
463 Second motor auto
C210 tuning setting/status
458 Second motor
C220 constant (R1)
 Offline auto tuning for a frequency search
• When the frequency search is selected by setting Pr.162 Automatic restart after instantaneous power failure selection
= "0 or 10", perform offline auto tuning.
 Before performing offline auto tuning
Check the following points before performing offline auto tuning:
• V/F control 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. (Note that the motor rated current
should be 0.4 kW or higher (0.1 kW or higher for the 200 V class).)
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 the motor rotating (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.
Initial
Setting range
value
0
1
0
10
11
0 to 32767
9999
0 to 32767
9999
9999
0
1
0
11
9999 0 to 50 Ω, 9999
0
1
0
11
9999 0 to 50 Ω, 9999
Description
Frequency search only performed at the first start
Reduced voltage start only at the first start (no frequency search)
Frequency search at every start
Reduced voltage start at every start (no frequency search)
The offline auto tuning automatically sets the gain required for the
frequency search.
The constant value of Mitsubishi Electric motor (SF-PR, SF-JR, SF-
HR, SF-JRCA, SF-HRCA, GM-[], and GM-[]P) is used.
The offline auto tuning automatically sets the gain required for the
frequency search of the second motor.
The constant value of Mitsubishi Electric motor (SF-PR, SF-JR, SF-
HR, SF-JRCA, SF-HRCA, GM-[], and GM-[]P) is used for the second
motor.
No offline auto tuning
Offline auto tuning is performed under Advanced magnetic flux vector
control, Real sensorless vector control, or PM sensorless vector
control. (Refer to page 309 and
Offline auto tuning is performed without the motor rotating (under V/
F control).
Tuning data (The value measured by offline auto tuning is
automatically set.)
9999: The constant value of Mitsubishi Electric motor (SF-PR, SF-JR,
SF-HR, SF-JRCA, SF-HRCA, GM-[], and GM-[]P) is used.
No auto tuning for the second motor.
Offline auto tuning is performed for the second motor. (Refer to
309 and page 318.)
Offline auto tuning is performed without the second motor rotating
(under V/F control).
Tuning data of the second motor (same as Pr.90)
14.9 Offline auto tuning for a frequency search
page 318.)
page
14.(A) Application Parameters
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