284
Check first when you have a trouble
5.5.2
Motor or machine is making abnormal acoustic noise
When operating the inverter with the carrier frequency of 3kHz or more set in
Pr. 72
, the carrier frequency will automatically
decrease if the output current of the inverter exceeds the value in parenthesis of the rated output current on
page
304
. This
may cause the motor noise to increase. But it is not a fault.
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.
40
Parameter
Setting
Increase the
Pr. 74 Input filter time constant
if steady
operation cannot be performed due to EMI.
161
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.
153
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.
77
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.
153
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.
219
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 a fan cover correctly.
294
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.
291
Parameter
Setting
The
Pr. 71 Applied motor
setting is wrong.
Check the
Pr. 71 Applied motor
setting.
99
—
Motor current is large.
Refer to "5.5.11 Motor current is too large"
287
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