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VFD68 Variable Frequency Drives
73
Table 71: Motor or Machine Generates Abnormal Acoustic Noise
Check
Points
Possible Cause
Action
Param.
Setting
Resonance occurs (mechanical system
resonance frequency)
•
For Frequency Jump 2, set P. 33 and P. 34.
•
For Frequency Jump 3, set P. 35 and P. 36
When it is desired to avoid resonance attributable to the
natural frequency of a mechanical system, these
parameters allow resonant frequencies to be jumped.
Resonance occurs (carrier frequency)
Change P. 72 setting.
Changing the PWM carrier frequency can reduce the
audible noise created when the motor is running at
speeds slower than the maximum rated speed (see
PWM Frequency, Audible Motor Noise, and EMI
Others
Mechanical looseness
Adjust machine/equipment so that there is no
mechanical looseness.
Motor
Operating with output phase loss
Check the motor wiring. Contact the motor
manufacturer.
Table 72: VFD Generates Abnormal Acoustic Noise
Check
Points
Possible Cause
Action
Fan
The fan cover was not correctly installed when a
cooling fan was replaced.
Install the fan cover correctly.
Table 73: Motor Generates Heat Abnormally
Check
Points
Possible Cause
Action
Param.
Setting
The fan motor is running too slowly to create
airflow.
Verify that P. 31 is set to 0 and P. 32 is set to 12.5 Hz. If
12.5 Hz is too slow, increase frequency for
•
P.32, C 2, C 5 (VFD68Bxx and VFD68Cxx
models)
•
P.32, P.902a, P.904a (VFD68Dxx models).
Motor
The fan motor is not working (dust is
accumulating.)
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 VFD output voltage (U, V, W) are
unbalanced.
Check the output voltage of the VFD.
Check the insulation of the motor.
Table 74: Motor Rotates in the Opposite Direction
Check
Points
Possible Cause
Action
Main
Circuit
Phase sequence of output terminals U, V and W
is incorrect.
Connect phase sequence of the output cables
(terminals U, V, W) to the motor correctly