We've got a Geared Elevator Hoist that is being run by an Imperial AC VVVF Motor. The Motor is rated @ 1164RPM and the Gear Ratio of the Hoist is 87-2.
About a month after this piece of equipment was installed, it began making a hollow droning sound that is at least 18db louder than the AC Hoist itself.
I recorded the elevator hoist running and captured some WAV file snapshots of the change in waveform.
There is a very obvious and distinct change in the soundwave when this droning begins. I have posted a visual snapshot of this waveform here..
Over the last few months it has become worse and worse and we cannot seem to figure out what it causing it.
I have figured out that the sound is sinewave shaped and it peaks at about 330-338 hz.
I have a recording of an elevator run and this sound
T+0- Elevator Start - Normal Sound
T+9.5s Droning Begins
T+10.5s Droning Peaks
T+12s Droning diminishes
T+15s Droning comes back
T+16 Droning Diminishes
T+17s Droning comes back and doesnt come back
T+24s End of Run.
I would be happy to provide a screen video of this waveform (about 30 seconds) if anyone could give me any help with this.
This is a really serious problem for our building and its residents and our current vendor refuses to acknowledge any kind of problem.
About a month after this piece of equipment was installed, it began making a hollow droning sound that is at least 18db louder than the AC Hoist itself.
I recorded the elevator hoist running and captured some WAV file snapshots of the change in waveform.
There is a very obvious and distinct change in the soundwave when this droning begins. I have posted a visual snapshot of this waveform here..
Over the last few months it has become worse and worse and we cannot seem to figure out what it causing it.
I have figured out that the sound is sinewave shaped and it peaks at about 330-338 hz.
I have a recording of an elevator run and this sound
T+0- Elevator Start - Normal Sound
T+9.5s Droning Begins
T+10.5s Droning Peaks
T+12s Droning diminishes
T+15s Droning comes back
T+16 Droning Diminishes
T+17s Droning comes back and doesnt come back
T+24s End of Run.
I would be happy to provide a screen video of this waveform (about 30 seconds) if anyone could give me any help with this.
This is a really serious problem for our building and its residents and our current vendor refuses to acknowledge any kind of problem.
