Mitsubishi Electric A800 Plus Series Function Manual page 53

Parameter setting procedure for dancer feedback speed control
• Note: Offline auto tuning time (with the initial setting)
Offline auto tuning setting
No motor rotation (Pr.96 = "1")
With motor rotation (Pr.96 = "101")
• When offline auto tuning ends, press the STOP/RESET key on the operation panel during PU operation. For External
operation, turn OFF the start signal (STF or STR signal).
This operation resets the offline auto tuning, and the PU's monitor display returns to the normal indication.
(Without this operation, next operation cannot be started.)
NOTE
• The motor constants measured once in the offline auto tuning are stored as parameters and their data are held until the
offline auto tuning is performed again. However, performing all parameter clear resets the tuning data.
• Changing Pr.71 (Pr.450) after tuning completion will change the motor constant. For example, if Pr.71 = "3" is set after tuning
is performed with Pr.71 ="0", the tuning data becomes invalid. Set Pr.71 = "0" again for using the tuning data.
• If offline auto tuning has ended in error (see the table below), motor constants are not set. Perform an inverter reset and
restart tuning.
Error display
8 Forced end
9 Inverter protective function operation
91 The current limit (stall prevention) function is activated.
The converter output voltage fell to 75% of the rated
92
voltage.
Calculation error
93
The motor is not connected.
Rotation tuning frequency setting error
(The frequency command for the tuning was given to
94
exceed the maximum frequency setting, or to be in the
frequency jump range.)
• When offline auto tuning with motor rotation is performed under vector control, the protective function (E.EPS) may be
activated.
Operation panel
indication
Name
Description
Check point
Corrective action
∗1
The data code is used for checking the fault detail via communication or for setting Pr.997 Fault initiation. (Refer to the Instruction Manual
(Detailed) of the FR-A800 inverter.)
• When tuning is ended forcibly by pressing the STOP/RESET key or turning OFF the start signal (STF or STR signal) during
tuning, offline auto tuning does not end properly. (The motor constants have not been set.)
Perform an inverter reset and restart tuning.
52
DANCER FEEDBACK SPEED CONTROL
Approx. 25 to 120 s
(The time depends on the inverter capacity and motor type.)
Approx. 40 s
(The following offline auto tuning time is set according to the acceleration/
deceleration time setting. Offline auto tuning time = Acceleration time + Deceleration
time + Approx. 30 s)
Error cause
E.EPS
Vector Vector Vector
Encoder pulse number setting error (Data code: 255 (HFF))
When the rotation speed deviates from the command value range while auto tuning with motor rotation is
performed under vector control, the inverter trips.
• Check the encoder setting (Pr.369, Pr.851, differential line driver / complementary) and wiring.
• Load inertia is too high, or the acceleration time is too short.
• Check that the load is not too large.
• Check the encoder setting and wiring.
• Set the acceleration time longer.
• Reduce the load.
Time
Countermeasures
Set Pr.96 = "1 or 101" and try again.
Make the setting again.
Set the acceleration/deceleration time longer.
Set Pr.156 Stall prevention operation selection =
"1".
Check for the power supply voltage fluctuation.
Check the Pr.84 Rated motor frequency setting.
Check the Pr.83 and Pr.84 settings.
Check the motor wiring and make the setting again.
Check the Pr.1 Maximum frequency and Pr.31 to
Pr.36 Frequency jump settings.
FR-LU08
Fault 15
indication
∗1