Mitsubishi Electric FR-E800, Instruction Manual

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15. (A) Application Parameters
15.9 Offline auto tuning for a frequency search
15.9
Offline auto tuning for a frequency search
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.
 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.
V/F V/F V/F
Pr. Name
Initial
value
Setting range Description
162
A700
Automatic restart after
instantaneous power
failure selection
0
0 Frequency search only performed at the first start
1 Reduced voltage start only at the first start (no frequency search)
10 Frequency search at every start
11 Reduced voltage start at every start (no frequency search)
298
A711
Frequency search gain 9999
0 to 32767
The offline auto tuning automatically sets the gain required for the
frequency search.
9999
The constant value of Mitsubishi Electric motor (SF-PR, SF-JR, SF-
HR, SF-JRCA, SF-HRCA, or GM-[]) is used.
560
A712 Second frequency
search gain
9999
0 to 32767
The offline auto tuning automatically sets the gain required for the
frequency search of the second motor.
9999
The constant value of Mitsubishi Electric motor (SF-PR, SF-JR, SF-
HR, SF-JRCA, SF-HRCA, or GM-[]) is used for the second motor.
96
C110 Auto tuning setting/
status
0
0 No offline auto tuning
1
Offline auto tuning is performed under Advanced magnetic flux vector
control, Real sensorless vector control, or PM sensorless vector
control. (Refer to
page 345 and page 355 .)
11
Offline auto tuning is performed without the motor rotating (under V/
F control).
90
C120
Motor constant (R1) 9999 0 to 50 Ω , 9999
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, or GM-[]) is used.
463
C210 Second motor auto
tuning setting/status
0
0 No auto tuning for the second motor.
1
Offline auto tuning is performed for the second motor. (Refer to page
345 and page 355 .)
11
Offline auto tuning is performed without the second motor rotating
(under V/F control).
458
C220 Second motor
constant (R1)
9999 0 to 50 Ω , 9999 Tuning data of the second motor (same as Pr.90 )