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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 122

Transistorized inverter, high function & low acoustic noise.
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5) When tuning was forced to end
A forced end occurs when tuning is forced to end by pressing the [STOP] key or turning off the start signal
(STF or STR) during tuning.
In this case, offline auto tuning was not brought to a normal end. (The motor constants are not yet set.)
Reset the inverter and restart tuning.
Note: 1. The motor constants measured once in the offline auto tuning are stored as parameters and their
data is held until the offline auto tuning is performed again.
2. An instantaneous power failure occurring during tuning will result in a tuning error. After power is
restored, the inverter goes into the ordinary operation mode. Therefore, when STF (STR) is on,
the motor runs in forward (reverse) rotation.
3. When "8888" is set in Pr. 11, the tuning is forced to end and the DC dynamic brake is started
upon input of the MRS signal.
4. Any alarm occurring during tuning is handled as in the ordinary mode.
Note that if an error retry has been set, retry is ignored.
5. The set frequency monitor displayed during the offline auto tuning is 0Hz.
Note that the motor may start running suddenly.
When the offline auto tuning is used in vertical lift application, e.g. a lifter, it may drop due to
insufficient torque.
<Setting the motor constants as desired>
The motor constants (Pr. 90 to Pr. 94) may be set as desired in either of two ways; the data measured
in the offline auto tuning is read and utilized or changed, or the motor constants are set without the
offline
auto tuning data being used.
To utilize or change the offline auto tuning data
<Operating procedure>
1. Set "801" in Pr. 77. Only when the Pr. 80 and Pr. 81 settings are other than "9999", the parameter
values of the motor constants (Pr. 90 to Pr. 94) can be displayed. Though the parameter values of
other than the motor constants (Pr. 90 to Pr. 94) can also be displayed, they are parameters for
manufacturer setting and should be handled carefully without misuse.
2. Set any of the following values in Pr. 71:
·
Standard motor ...................................................................................... Pr. 71 = "4"
·
Constant-torque motor........................................................................... Pr. 71 = "14"
·
Mitsubishi standard motor SF-JR 4 poles (1.5kW (2HP) or less).......... Pr. 71 = "24"
3. In the parameter setting mode, read the following parameters and set desired values. (Note 1)
Parameter
Name
Number
82
Motor exciting current
90
Motor constant R1
91
Motor constant R2
92
Motor constant L1
93
Motor constant L2
94
Motor constant X
4. Return the Pr. 77 setting to the original value.
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CAUTION
Setting
Setting Range
Increments
0 to **** , 9999
1
0 to **** , 9999
1
0 to **** , 9999
1
0 to **** , 9999
1
0 to **** , 9999
1
0 to **** , 9999
1
109
PARAMETERS
Factory
Setting
9999
9999
9999
9999
9999
9999

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