Motor Or Machine Generates Abnormal Noise; Inverter Generates Abnormal Noise - Mitsubishi Electric FR-E700 Series Instruction Manual

Check first when you have troubles
7.6.2

Motor or machine generates abnormal noise

Check Points
Input signal
Parameter
setting
Parameter
setting
Others
Motor
7.6.3

Inverter generates abnormal noise

Check Points
Fan
7 - 24
Possible Cause
Disturbance due to EMI when frequency
command is given from analog input (termi-
nal 2, 4).
No carrier frequency noises (metallic noises)
are generated.
Resonance occurs (output frequency)
Resonance occurs (carrier frequency)
Auto tuning is not performed under
Advanced magnetic flux vector control or
General-purpose magnetic flux vector con-
trol.
Gain adjustment during PID control is insuffi-
cient.
Mechanical looseness
Operating with output phase loss
Contact the motor manufacturer.
Possible Cause
Fan cover was not correctly installed when a
cooling fan was replaced.
Countermeasures
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 oper-
ation 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 attrib-
utable to the natural frequency of a mechani-
cal system, these parameters allow resonant
frequencies to be jumped.
Change Pr. 72 "PWM frequency selection"
setting.
Changing the PWM carrier frequency pro-
duces 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 meas-
ured value.
Adjust machine/equipment so that there is
no mechanical looseness.
Check the motor wiring.
Countermeasures
Install a fan cover correctly.
Troubleshooting
Refer to
Page
3-43
6-180
6-173
6-52
6-173
6-88
6-277
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Refer to
Page
8-6