Mitsubishi Electric 800 Series Instruction Manual page 312

• For tuning accuracy improvement, set the following parameters when the motor constants are known in advance.
First motor Second
Pr. motor Pr.
702 743 Maximum motor frequency
707 744 Motor inertia (integer)
724 745 Motor inertia (exponent)
725 746 Motor protection current level
*1 The setting is valid only when a value other than "9999" is set in both Pr.707 (Pr.744) and Pr.724 (Pr.745).
 Performing tuning
• Before performing tuning, check the monitor display of the operation panel if the inverter is in the state ready for tuning. The
motor starts by turning ON the start command while tuning is unavailable.
• In the PU operation mode, press the RUN key on the operation panel.
In the External operation, turn ON the start command (STF signal or STR signal). Tuning starts.
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, 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.
• A motor with 14 or more poles cannot be tuned.
• 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.
Pr.96 (Pr.463) setting
(1) Setting
(2) During tuning
(3) Normal completion
• When offline auto tuning ends, press the STOP/RESET key on the operation panel during PU operation. In the External
operation, 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.)
Name
Maximum motor frequency (Hz)
Motor inertia
Jm = Pr.707 × 10^(-Pr.724) (kg·m
Maximum current level of the motor (%)
Operation panel indication
Blinking
Setting
*1
2
)
13. (C) Motor Constant Parameters
13.3 Offline auto tuning for a PM motor (motor constant tuning)
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