Check first when you have a trouble
Motor or machine is making abnormal acoustic noise
6 - 36
Disturbance due to EMI when frequency or
torque command is given from analog input
(terminal 1, 2, 4).
No carrier frequency noises (metallic noises)
The motor noise increases due to activation
of the carrier frequency automatic
reduction function when the motor is
Resonance occurs. (output frequency)
Resonance occurs. (carrier frequency)
Auto tuning is not performed under
Advanced magnetic flux vector control.
Gain adjustment during PID control is
The gain is too high under PM motor
Contact the motor manufacturer.
Operating with output phase loss
Take countermeasures against EMI.
Increase the Pr. 74 "Input filter time constant" if
steady operation cannot be performed due to
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.
Reduce the load.
Disable the automatic reduction function by
setting Pr. 260 "PWM frequency automatic
switchover" = "0".
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.
Change Pr. 72 "PWM frequency selection"
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
Check the calibration of set point and measured
Check the setting values of Pr. 820 "Speed
control P gain 1" and Pr. 824 "Torque control P
gain 1 (current loop proportional gain)".
Adjust machine/equipment so that there is no
Check the motor wiring.