Check First When You Have Some Troubles; Motor Will Not Start; Motor Generates Abnormal Noise - Mitsubishi Electric FR-E720-600 Instruction Manual

5.5

Check first when you have some 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.
5.5.1

Motor will not start

1) Check the Pr. 0 Torque boost setting if V/F control is exercised. (Refer to page 77)
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, RUN LED of the operation panel flickers.)
Check that the AU signal is on when terminal 4 is used for frequency setting.
Check that the output stop signal (MRS) or reset signal (RES) is not on.
Check that the sink or source jumper connector is fitted securely. (Refer to page 23)
4) Check the parameter settings
Check that Pr. 78 Reverse rotation prevention selection is not set.
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 starting frequency 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 maximum frequency Pr. 1 Maximum frequency is not zero.
Check that the Pr. 15 Jog frequency setting is not lower than the Pr. 13 Starting frequency value.
Check that the operation location by Pr. 550 and Pr. 551 is appropriate. (Example: write from the operation panel
is disabled when USB is connected)
(Refer to page 259).
5) Inspection of load
Check that the load is not too heavy.
Check that the shaft is not locked.
6) Others
Check that ALARM lamp is not lit.
Check that the operation panel display does not show a fault (e.g. E.OC1).
5.5.2

Motor generates abnormal noise

No carrier frequency noises (metallic noises) are generated.
Soft-PWM control 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.
Check for any mechanical looseness.
Contact the motor manufacturer.

Check first when you have some troubles

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