Mitsubishi Electric 800 Series Instruction Manual (Function page 390

• For tuning accuracy improvement, set the following parameters when the motor constants are known in advance.
First motor Second
Pr. motor Pr.
707 744
724 745
*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, 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 Operation panel indication
(1) Setting
(2) During tuning
(3) Normal
completion
• Note: Offline auto tuning time (with the initial setting)
Offline auto tuning setting
Pr.96 = "1"
Name
Motor inertia (integer)
Motor inertia (exponent)
Blinking
About 25 to 100 s. (The time depends on the inverter capacity and motor type.)
Mitsubishi Electric
motor (SF-PR, SF-PR-
SC, SF-JR, SF-HR, SF-
JRCA, SF-HRCA, SF-
V5RU, GM-[], GM-DZ, or
GM-DP)
Motor inertia
9999 (initial value)
Jm = Pr.707 × 10^(-Pr.724) (kg·m
LCD operation panel (FR-LU08)
display
AutoTune 12:34
TUNE
1
--- STOP PU
PREV NEXT
AutoTune 12:34
TUNE
2
STF FWD PU
PREV NEXT
AutoTune 12:34
TUNE
3
Completed
STF STOP PU
PREV NEXT
Time
Other motors
*1
2
)
15. (C) Motor Constant Parameters
15.2 Offline auto tuning
11
12
13
14
15
16
17
18
19
20
389