Motor Or Machine Is Making Abnormal Acoustic Noise - Mitsubishi 700 Series Instruction Manual

Check first when you have a trouble
4.6.2

Motor or machine is making abnormal acoustic noise

Check
points
Input
signal
Disturbance due to EMI when frequency command is
Parameter given from analog input (terminal 2, 4).
Setting
No carrier frequency noises (metallic noises) are
generated.
Resonance occurs. (output frequency)
Parameter
Setting
Resonance occurs. (carrier frequency)
Auto tuning is not performed under General-purpose
magnetic flux vector control.
Gain adjustment during PID control is insufficient.
Others Mechanical looseness
Operating with output phase loss
Motor
Contact the motor manufacturer.
112
Possible Cause 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 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.
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.
Adjust machine/equipment so that there is no
mechanical looseness.
Check the motor wiring.
Refer
to
page
82
82
78
82
50
87
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