Mitsubishi Electric FR-A800, Инструкция по эксплуатации

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Protective functions Check first when you have a trouble
FR-A800 6 - 39
6.6.2 Motor or machine is making abnormal acoustic noise
Check
points
Possible cause Countermeasure
Refer to
page
Input
signal
Disturbance due to EMI when frequency or
torque command is given from analog input
(terminal 1, 2, 4).
Take countermeasures against EMI. 3-1
Parameter
Setting
Increase the Pr. 74 "Input filter time constant" if
steady operation cannot be performed due to
EMI.
5-399
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.
5-219
The motor noise increases due to activation
of the carrier frequency automatic
reduction function when the motor is
driven overloaded.
Reduce the load.
Disable the automatic reduction function by
setting Pr. 260 "PWM frequency automatic
switchover" = "0".
5-219
Resonance occurs. (output frequency)
Set Pr. 31 to Pr. 36, Pr. 552 (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.
5-312
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.
5-219
Set a notch filter. 5-121
Auto tuning is not performed under
Advanced magnetic flux vector control, Real
sensorless vector control, or vector control.
Perform offline auto tuning. 5-67
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.
5-524
The gain is too high under Real sensorless
vector control, vector control, or PM
sensorless vector control.
During speed control, check the setting of
Pr. 820 "Speed control P gain 1".
5-67
During torque control, check the setting of
Pr. 824 "Torque control P gain 1".
5-144
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.
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