Mitsubishi FR-A800

(C) Motor constant parameters
446
PARAMETERS
• For tuning accuracy improvement, set the following parameters when the motor constants are known in advance.
 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
POINTPOINT
• Before performing tuning, check the monitor display of the operation panel or the parameter unit if the inverter is in the state
ready for tuning. (Refer to 2) below.) Turning ON the start command while tuning is unavailable starts the motor.
• In the PU operation mode, press / on the operation panel.
For External operation, turn ON the start command (STF signal or STR signal). Tuning will start.
NOTE
• Satisfy the required inverter start conditions to start offline auto tuning. For example, stop the input of MRS signal.
• To force tuning to end, use the MRS or RES signal or press on the operation panel.
(Turning the start signal (STF signal or STR signal) OFF also ends tuning.)
• During offline auto tuning, only the following I/O signals are valid. (initial value)
Input terminals <effective signals>: STP (STOP), OH, MRS, RT, RES, STF, STR, S1 and S2
Output terminals: RUN, OL, IPF, FM/CA, AM, A1B1C1 and 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 fifteen 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.
• Setting offline auto tuning (Pr.96 Auto tuning setting/status = "1 or 101") will make pre-excitation invalid.
• When the offline auto tuning is selected (Pr.96 Auto tuning setting/status = "101"), the motor rotates. Take caution and
ensure the safety.
• 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 run 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 the PU operation external interlock (X12) signal ON to tune in the PU
operation mode.
• Monitor is displayed on the operation panel (FR-DU08) and parameter unit (FR-PU07) during tuning as below.
First
motor Pr.
Second
motor Pr.
Name
Mitsubishi motor (SF-
JR, SF-HR, SF-JRCA,
SF-HRCA, SF-V5RU)
Other motors
707 744 Motor inertia (integer)
9999 (initial value)
Motor inertia
Jm=Pr.707  10^(- Pr.724) (kg/m
2
)
724 745 Motor inertia (exponent)
Pr.96 setting value 1 101 1 101
(1) Setting
Parameter unit (FR-PU07) display Operation panel (FR-DU08) display
(2) During tuning
(3) Normal completion
(4) Forced end
STOP PU
1
READ:List
STOP PU
101
READ:List
FWD PU
2
STF
TUNE
FWD PU
102
STF
TUNE
STOP PU
3
STF
TUNE
COMPLETION
STOP PU
103
STF
TUNE
COMPLETION
Flickering
Flickering
STOP PU
8
TUNE
ERROR