Mitsubishi Electric 800 Series Instruction Manual page 304

NOTE
• Satisfy the required inverter start conditions to start offline auto tuning. For example, stop the input of the MRS signal.
• To force tuning to end, use the MRS or RES signal or the STOP/RESET key on the operation panel.
(Turning OFF the start signal (STF signal or STR signal) also ends tuning.)
• During offline auto tuning, only the following I/O signals are valid (initial value).
Input terminals <effective signals>: MRS, RES, STF, STR, S1, and S2
Output terminals: RUN, FU, FM, AM, ABC, and SO
• When the rotation speed and the output frequency are selected for terminals FM and AM, the progress status of offline auto
tuning is output in 15 steps from FM and AM (in the standard model).
• Do not perform ON/OFF switching of the Second function selection (RT) signal during offline auto tuning. Auto tuning will not
be performed properly.
• Since the Inverter running (RUN) signal turns ON when tuning is started, pay close attention especially when a sequence which
releases a mechanical brake by the RUN signal has been designed.
• When executing offline auto tuning, input the operation command after switching ON the main circuit power (R/L1, S/L2, T/L3)
of the inverter.
• While Pr.79 Operation mode selection = "7", turn ON the PU operation external interlock (X12) signal for tuning in the PU
operation mode.
• During tuning, the monitor is displayed on the operation panel as follows.
Tuning status
(1) Setting
(2) During tuning
(3) Normal completion
• Note: Offline auto tuning time (with the initial setting)
Offline auto tuning setting
Pr.96 = "1"
• When offline auto tuning ends, press the STOP/RESET key on the operation panel during PU operation. In the External
operation mode, turn OFF the start signal (STF signal or STR signal).
This operation resets the offline auto tuning, and the monitor display of the operation panel returns to normal.
(Without this operation, next operation cannot be started.)
NOTE
• The motor constants measured once during offline auto tuning are stored as parameters and their data are held until offline
auto tuning is performed again. However, the tuning data is cleared when performing All parameter clear.
• Changing Pr.71 (Pr.450) after tuning completion will change the motor constant. For example, if "3" is set in Pr.71 after tuning
is performed with Pr.71 = "0", the tuning data becomes invalid. To use the tuned data, set "0" again in Pr.71.
• If offline auto tuning has ended in error (see the following table), motor constants are not set. Perform an inverter reset and
restart tuning.
Operation panel indication
Blinking
About 25 to 100 s. (The time depends on the inverter capacity and motor type.)
Time
13. (C) Motor Constant Parameters
13.2 Offline auto tuning
11
12
13
14
15
16
17
18
19
20
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