8-25
8-2-11 Mechanical Vibration
H Mechanical system makes unusual noise.
·Resonance between the characteristic frequency of the mechanical system and the
carrier frequency.
There may be resonance between the characteristic frequency of the mechanical
system and the carrier frequency. If the motor is running with no problems and the
machinery system is vibrating with a high-pitched whine, it may indicate that this is
occurring. To prevent this type of resonance, adjust the carrier frequency value in
n080.
·Resonance between the characteristic frequency of a machine and the output fre-
quency of the Inverter.
Theremayberesonancebetweenthecharacteristicfrequencyofamachineandthe
output frequency of the Inverter. To prevent this from occurring, use the frequency
jump function with the constants set in n083 through n086 to change the output fre-
quency or install vibration-proof rubber on the motor base to prevent the resonance
of the mechanical system.
H Vibration and hunting are occurring.
·Influence by the torque compensation function or the slip compensation function.
The torque compensation function or the slip compensation function of the Inverter
mayinfluencethecharacteristicfrequencyofthemechanicalsystem,causingvibra-
tion or hunting. In that case, increase the time constants in n104 for torque com-
pensation and in n112 for slip compensation. The larger these time constants are,
however, the slower the response speed of the torque compensation function and
slip compensation function will be.
H Motor vibrates excessively and does not rotate normally.
·Motor Phase Interruption
If one or two ofthe threephases of themotor are open,the motorwill vibrate exces-
sively and will not rotate.Checkthatthe motor is wiredcorrectly withoutany discon-
nection. The same phenomenon will occur if the output transistor of the Inverter is
open and damaged. Check the balance of the Inverter’s output voltage as well.
Maintenance Operations Chapter 8
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