When first acquired, the motor pulley had problems and a new pulley made.
Several years have passed with great performance from a VFD.

Recently, I occasionally get 'bump' noises.

Investigation reveals the 'bump' is associated with the belt.
I can initiate the bump by leaning on the motor to increase the belt tension.
The tension adjustment is one-way only using a pivot shaft and jacking screw, so easy to lean on it to increase then tension.
It seems to be associated with the belt passing around the motor pulley, always the same part of the belt.
The belt appears to be constant in section and appearance throughout its length.

Do belts have localized stiff areas that flex differently to the general belt performance ?

Tomorrow, I will increase the belt tension, check belt details and order a spare.

This post is just a general inquiry for any suggestions of specific inspection, test or investigation aspect that might be followed.

Keep well,
John.


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