Check First When You Have Troubles; Motor Does Not Rotate As Commanded; Motor Generates Abnormal Noise; Motor Generates Heat Abnormally - Mitsubishi Electric FR-F740-00023-EC Instruction Manual

Check first when you have troubles

4.6 Check first when you have troubles

POINT
If the cause is still unknown after every check, it is recommended to initialize the parameters (initial value) then re-
set the required parameter values and check again.

4.6.1 Motor does not rotate as commanded

1) Check the value of Pr. 0 Torque boost setting . (Refer to page 57)
2) Check the main circuit.
Check that a proper power supply voltage is applied (operation panel display is provided).
Check that the motor is connected properly.
Check that the jumper across P/+-P1 is connected.
3) Check the input signals
Check that the start signal is input.
Check that both the forward and reverse rotation start signals are not input simultaneously.
Check that the frequency setting signal is not zero. (When the frequency command is 0Hz and the
start command is entered, FWD or REV LED on the operation panel flickers.)
Check that the AU signal is on when the frequency setting signal is 4 to 20mA.
Check that the output stop signal (MRS) or reset signal (RES) is not on.
Check that the CS signal is not OFF with automatic restart after instantaneous power failure function
is selected (Pr. 57 ≠ "9999").
Check that the sink or source jumper connector is fitted securely. (Refer to page 18.)
4) Check the parameter settings
Check that the Pr. 78 Reverse rotation prevention selection is not selected.
Check that the Pr. 79 Operation mode selection setting is correct.
Check that the bias and gain (calibration parameter C2 to C7) settings are correct.
Check that the Pr. 13 Starting frequency setting is not greater than the running frequency.
Check that frequency settings of each running frequency (such as multi-speed operation) are not zero.
Check that especially the Pr. 1 Maximum frequency is not zero.
Check that the Pr. 15 Jog frequency setting is not lower than the Pr. 13 Starting frequency setting.
5) Inspection of load
Check that the load is not too heavy.
Check that the shaft is not locked.

4.6.2 Motor generates abnormal noise

No carrier frequency noises (metallic noises) are generated.
Soft-PWM operation to change the motor tone into an unoffending complex tone is factory-set to
valid by Pr.72 PWM frequency selection.
Adjust Pr.72 PWM frequency selection to change the motor tone.
(When operating the inverter with the carrier frequency of 3kHz or more set in Pr. 72, the carrier
frequency will automatically decrease if the output current of the inverter exceeds the value in
parenthesis of the rated output current on page 254. This may cause the motor noise to increase.
But it is not a fault.)
Check for any mechanical looseness.
Contact the motor manufacturer.

4.6.3 Motor generates heat abnormally

Is the fan for the motor is running? (Check for accumulated dust.)
Check that the load is not too heavy. Lighten the load.
Check that the inverter output voltages (U, V, W) balanced.
Check that the Pr.0 Torque boost setting is correct.
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