5-14
5-2-10 Mechanical System Makes Noise
•The carrier frequency and the natural frequency of the mechanical system resonates.
Take the following actions:
S Frequency Jump
Use the frequency jump function with the constants set in n56 to n59 to change the
output frequency to prevent the resonance of the mechanical system.
S Adjust the carrier frequency.
Adjusting the carrier frequency (n37) may prevent resonance from occurring.
S Install vibration-proof rubber.
Install vibration-proof rubber on the motor base.
5-2-11 Motor Rotates after Output of Inverter is Turned
Off
•Insufficient DC Control
After the Inverter is in deceleration stop operation, the motor can continue rotating at
low revolution if the DC control of the Inverter is insufficient.
In such cases, adjust the DC control as described below.
S Increase the constant set in n46 for the DC control current to a larger value.
S Set the constant of the interruption DC control time in n47 to a larger value.
5-2-12 Overvoltage is Detected When Fan is Turned On
or Revolution of Fan Decreases
•Insufficient DC Control
Overvoltage can be detected when the fan is turned on or the revolution of the fan
decreases if the fan is turned on while the fan is rotating.
To prevent this, use the DC control function and decrease the revolution of the fan
before turning the fan on or increase the constant set in n48 for the startup DC control
time to a larger value.
5-2-13 Output Frequency Does Not Reach Reference
Frequency
•The reference frequency is within the jump frequency.
If the jump function is used, the output frequency stays within the jump frequency.
Operation Chapter 5
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