Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 524

• For tuning accuracy improvement, set the following parameters when the motor constants are known in advance.
Second
First motor
monitor
Pr.
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 or parameter unit 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
For 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 press
signal or STR signal) also ends tuning.)
• During offline auto tuning, only the following I/O signals are valid (initial value).
Input terminals <valid signals>: STP (STOP), OH, MRS, RT, RES, STF, STR, S1, and S2
Output terminals: RUN, OL, IPF, FM/CA, AM, A1B1C1, and So (SO)
• When the rotation speed and the output frequency are selected for terminals FM/CA and AM, the progress status of offline
auto tuning is output in 15 steps from FM/CA and AM.
• 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.
• Setting offline auto tuning (Pr.96 = "1 or 11") will make pre-excitation invalid.
• 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
Name
Maximum motor frequency (Hz)
Motor inertia
Jm = Pr.707 × 10^(-Pr.724) (kg·m
Maximum current level of the motor (%)
/ on the operation panel.
1
Operation panel (FR-DU08) display
Blinking
Setting for a PM motor
other than MM-CF
*1
2
)
on the operation panel. (Turning OFF the start signal (STF
11 1
Parameter unit (FR-LU08) display
AutoTune
TUNE
--- STOP
PREV
AutoTune
TUNE
STF FWD
PREV
AutoTune
TUNE
Completed
STF STOP
Blinking
PREV
Setting for
MM-CF
9999 (initial value)
9999 (initial value)
9999 (initial value)
11
AutoTune 12:34
12:34
TUNE
11
1
--- STOP PU
PU
PREV NEXT
NEXT
12:34 AutoTune 12:34
TUNE
2 12
PU STF FWD PU
NEXT PREV NEXT
12:34
AutoTune 12:34
TUNE
3
13
Completed
PU
STF STOP PU
NEXT
PREV NEXT
5. PARAMETERS
5.13 (C) Motor constant parameters
1
2
3
4
5
6
7
8
9
10
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