4-14
(3) Tuning
Set function code P04* to "1" or "2" and press the key. (The blinking of
1
or
2
on the LED monitor will slow
down.)
Enter a run command. The factory default is " key on the keypad for forward rotation." To switch to reverse rotation
or to select the terminal signal FWD or REV as a run command, change the data of function code F02.
The moment a run command is entered, the display of
1
or
2
lights up, and tuning starts with the motor stopped.
(Maximum tuning time: Approx. 40 to 80 s.)
If P04* = 2, after the tuning in
above, the motor is accelerated to approximately 50% of the base frequency and then
tuning starts. Upon completion of measurements, the motor decelerates to a stop.
(Estimated tuning time: Acceleration time + 20 to 75 s + Deceleration time)
If P04* = 2, after the motor decelerates to a stop in
above, tuning continues with the motor stopped.
(Maximum tuning time: Approx. 40 to 80 s.)
If the terminal signal FWD or REV is selected as a run command (F02 = 1),
end
appears upon completion of the
measurements. Turning the run command OFF completes the tuning.
If the run command has been given through the keypad or the communications link, it automatically turns OFF upon
completion of the measurements, which completes the tuning.
Upon completion of the tuning, the subsequent function code P06* appears on the keypad.
Tuning errors
Improper tuning would negatively affect the operation performance and, in the worst case, could even cause hunting or
deteriorate precision. Therefore, if the inverter finds any abnormality in the tuning results or any error in the tuning process, it
displays
er7
and discards the tuning data.
Listed below are possible causes that trigger tuning errors.
Possible tuning error causes Details
Error in tuning results
- An interphase voltage unbalance or output phase loss has been detected.
- Tuning has resulted in an abnormally high or low value of a parameter due to the output
circuit opened.
Output current error An abnormally high current has flown during tuning.
Sequence error
During tuning, a run command has been turned OFF, or STOP (Force to stop), BX (Coast to
a stop), DWP (Protect from dew condensation), or other similar terminal command has been
received.
Error due to limitation
- During tuning, any of the operation limiters has been activated.
- The maximum frequency or the frequency limiter (high) has limited tuning operation.
Other errors An undervoltage or any other alarm has occurred.
If any of these errors occurs, remove the error cause and perform tuning again, or consult your Fuji Electric representative.
If a filter other than the Fuji optional output filter (OFL
-
-
A) is connected to the inverter's output (secondary)
circuit, the tuning result cannot be assured. When replacing the inverter connected with such a filter, make a note o
the old inverter’s settings for the primary resistance %R1, leakage reactance %X, no-load current, and rated slip
frequency, and specify those values to the new inverter’s function codes.
Vibration that may occur when the motor's coupling is elastic can be regarded as normal vibration due to the output
voltage pattern applied in tuning. The tuning does not always result in an error; however, run the motor and check its
running state.
4.1.12 Running the inverter for motor operation check
If the user configures the function codes wrongly without completely understanding this Instruction Manual and the
FRENIC-MEGA User's Manual, the motor may rotate with a torque or at a speed not permitted for the machine.
Accident or injury may result.
After completion of preparations for a test run as described above, start running the inverter for motor operation check using the
following procedure.
If any abnormality is found in the inverter or motor, immediately stop operation and investigate the cause referring to
Chapter 6, "TROUBLESHOOTING."
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