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Check first when you have a trouble
5
PROTECTIVE FUNCTIONS
5.5.2 Motor or machine is making abnormal acoustic noise
Even if the carrier frequency (Pr. 72) is set to a value higher than 3kHz for a 55K or lower capacity inverter, the carrier
frequency is automatically lowered to as low as 2kHz in an overloaded operation at a low speed (output frequency lower than
3Hz). Acoustic noise from the motor increases, but it is not a fault. (Refer to page 284 for Pr. 72)
5.5.3 Inverter generates abnormal noise
5.5.4 Motor generates heat abnormally
Check
points
Possible Cause Countermeasures
Refer
to
page
Input
signal
Disturbance due to EMI when frequency command is
given from analog input (terminal 1, 2, 4).
Take countermeasures against EMI. 52
Parameter
Setting
Increase the Pr. 74 Input filter time constant if steady
operation cannot be performed due to EMI.
292
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.
284
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.
158
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.
284
Set a notch filter. 118
Auto tuning is not performed under Advanced magnetic
flux vector control, Real sensorless vector control, or
vector control.
Perform offline auto tuning. 189
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.
361
The gain is too high under Real sensorless vector
control or vector control.
During speed control, check the setting of Pr. 820 (Pr.
830) speed control P gain.
105
During torque control, check the setting of Pr. 824 (Pr.
834) torque control P gain.
130
Others
Mechanical looseness
Adjust machine/equipment so that there is no
mechanical looseness.
—
Contact the motor manufacturer.
Motor Operating with output phase loss Check the motor wiring. —
Check
points
Possible Cause Countermeasures
Refer
to
page
Fan
Fan cover was not correctly installed when a cooling fan
was replaced.
Install the fan cover correctly. 431
Check
points
Possible Cause Countermeasures
Refer
to
page
Motor
Motor fan is not working
(Dust is accumulated.)
Clean the motor fan.
Improve the environment.
—
Phase to phase insulation of the motor is insufficient. Check the insulation of the motor. —
Main
Circuit
The inverter output voltage (U, V, W) are unbalanced.
Check the output voltage of the inverter.
Check the insulation of the motor.
429
Parameter
Setting
The Pr. 71 Applied motor setting is wrong. Check the Pr. 71 Applied motor setting.
187
— Motor current is large. Refer to "5.5.11 Motor current is too large" 424