112
Check first when you have a trouble
4.6.2 Motor or machine is making abnormal acoustic noise
Check
points
Possible Cause Countermeasures
Refer
to
page
Input
signal
Disturbance due to EMI when frequency command is
given from analog input (terminal 2, 4).
Take countermeasures against EMI.
Parameter
Setting
Increase the Pr. 74 Input filter time constant if steady
operation cannot be performed due to EMI.
82
Parameter
Setting
No carrier frequency noises (metallic noises) are
generated.
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.
82
Resonance occurs. (output frequency)
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.
78
Resonance occurs. (carrier frequency)
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.
82
Auto tuning is not performed under General-purpose
magnetic flux vector control.
Perform offline auto tuning. 50
Gain adjustment during PID control is insufficient.
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.
87
Others
Mechanical looseness
Adjust machine/equipment so that there is no
mechanical looseness.
—
Motor
Operating with output phase loss Check the motor wiring. —
Contact the motor manufacturer.
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