Motor Or Machine Is Making Abnormal Acoustic Noise; Inverter Generates Abnormal Noise - Mitsubishi Electric FR-A800 Series Instruction Manual

6.6.2
Check
point
Input
Disturbance due to EMI when the frequency
signal
or torque command is given through analog
Parameter
input terminal 1, 2, or 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)
Resonance occurs. (Carrier frequency)
Parameter
setting
Auto tuning is not performed under
Advanced magnetic flux vector control,
Real sensorless vector control, or Vector
control.
Gain adjustment during PID control is
insufficient.
The gain is too high under Real sensorless
vector control, Vector control, or PM
sensorless vector control.
Mechanical looseness
Others
Contact the motor manufacturer.
Motor Operating with output phase loss
6.6.3
Check
point
The fan cover was not correctly installed
Fan
when a cooling fan was replaced.
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Motor or machine is making abnormal acoustic
noise
Possible cause

Inverter generates abnormal noise

Possible cause
search engine
Countermeasure
Take countermeasures against EMI.
Increase the Pr.74 Input filter time constant setting 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". (As
the load remains excessive, overload may cause a protective
function E.THT.)
Set Pr.31 to Pr.36, and 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 the 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.
Set a notch filter.
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 (current loop proportional gain).
Adjust machine/equipment so that there is no mechanical
looseness.
Check the motor wiring.
Countermeasure
Install the fan cover correctly.
Refer to
116
503
356
356
429
356
271
532
601
254
294
—
—
Refer to
816
6. PROTECTIVE FUNCTIONS
6.6 Check first when you have a trouble
1
2
page
3
4
5
6
7
8
9
10
page
803