Motor Or Machine Is Making Abnormal Acoustic Noise; Inverter Generates Abnormal Noise - Mitsubishi Electric FR-F800 Instruction Manual

Check first when you have a trouble
6.6.2
Motor or machine is making abnormal acoustic
noise
Check
points
Input
Disturbance due to EMI when frequency or
signal
torque command is given from analog input
Parameter
(terminal 1, 2, 4).
Setting
No carrier frequency noises (metallic noises)
are generated.
The motor noise increases due to activation of
the carrier frequency automatic reduction
function when the motor is driven overloaded.
Resonance occurs. (output frequency)
Parameter
Resonance occurs. (carrier frequency)
Setting
Auto tuning is not performed under Advanced
magnetic flux vector control.
Gain adjustment during PID control is
insufficient.
The gain is too high under PM motor control.
Mechanical looseness
Others
Contact the motor manufacturer.
Motor
Operating with output phase loss
6.6.3

Inverter generates abnormal noise

Check
points
Fan cover was not correctly installed when a
Fan
cooling fan was replaced.
554
PROTECTIVE FUNCTIONS
Possible cause
Possible cause
Countermeasure
Take countermeasures against EMI.
Increase the Pr.74 Input filter time constant if steady
operation cannot be performed due to EMI.
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.
Reduce the load.
Disable the automatic reduction function by setting Pr.260
PWM frequency automatic switchover = "0".
Set Pr.31 to Pr.36, Pr.552 (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.
To stabilize the measured value, change the proportional band
(Pr.129) to a larger value, the integral time (Pr.130) to a slightly
longer time, and the differential time (Pr.134) to a slightly
shorter time.
Check the calibration of set point and measured value.
During speed control, check the setting of Pr.820 Speed
control P gain 2.
During torque control, check the setting of Pr.824 Torque
control P gain 2.
Adjust machine/equipment so that there is no mechanical
looseness.
Check the motor wiring.
Countermeasure
Install a fan cover correctly.
Refer to
page
72
313
179
179
246
179
341
378
154
154
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Refer to
page
567