Motor Or Machine Is Making Abnormal Acoustic Noise; Inverter Generates Abnormal Noise - Mitsubishi Electric 700 Series Instruction Manual

Check
points
Inverter decelerated to a stop when power failure
deceleration stop function is selected.
Parameter
Setting
Performing auto tuning.
Load is too heavy.
Load
Shaft is locked.
Others Operation panel display shows an error (e.g. E.OC1).
6.5.2

Motor or machine is making abnormal acoustic noise

Check
points
No carrier frequency noises (metallic noises) are
generated.
Resonance occurs. (output frequency)
Parameter
Setting
Resonance occurs. (carrier frequency)
Auto tuning is not performed under Advanced magnetic
flux vector control or General-purpose magnetic flux
vector control.
Others Mechanical looseness
Operating with output phase loss
Motor
Contact the motor manufacturer.
6.5.3

Inverter generates abnormal noise

Check
points
Fan cover was not correctly installed when a cooling fan
Fan
was replaced.
Possible Cause
Possible Cause
Possible Cause
Check first when you have a trouble
Countermeasures
When power is restored, ensure the safety, and turn
OFF the start signal once, then turn ON again to restart.
Inverter restarts when Pr. 261="2".
When offline auto tuning ends, press
operation panel. For the Network operation, turn OFF
the start signal (STF or STR).
This operation resets the offline auto tuning, and the
operation panel monitor display returns to the normal.
(Without this operation, next operation cannot be started.)
Reduce the load.
Inspect the machine (motor).
When any fault occurs, take an appropriate corrective
action, then reset the inverter, and resume the
operation.
Countermeasures
In the initial setting, Pr. 240 Soft-PWM operation selection is
enabled to change motor noise to an unoffending
complex tone. Therefore, no carrier frequency noises
(metallic noises) are generated.
Set Pr. 240 = "0" to disable this function.
Set Pr. 31 to Pr. 36 (Frequency jump).
When it is desired to avoid resonance attributable to the
natural frequency of a mechanical system, these
parameters allow resonant frequencies to be jumped.
Change Pr. 72 PWM frequency selection setting.
Changing the PWM carrier frequency produces an effect
on avoiding the resonance frequency of a mechanical
system or a motor.
Perform offline auto tuning.
Adjust machine/equipment so that there is no
mechanical looseness.
Check the motor wiring.
Countermeasures
Install a fan cover correctly.
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