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Vibration

Guest · 2015-05-24T23:26:00Z

Hello,I hope someone out there has some ideas on a problem we are having on a newly modernized duplex. The OEM is Otis/Beckett using an overhead 22CT machine roped 1:1, no deflector. Speed is 350 Ft/min, Capacity 2500 LBS, empty car weight 3300 LBS, there are 4 5/8" ropes and 22 stops, whisper flex compensation. The controller we installed is MCE M4000 using the KEB drive and new Reuland motor. We retained the machine. We replaced hoist ropes, compensation (was chain), slipper guides with Elsco rollers on the car and cwt.The issue we are having is a vibration that you can feel in your feet throughout the travel of the car. It seems like rope vibration so we isolated the hitch plate but it made no difference. We checked roller guides but we cannot figure out the source. The machine seems ok and we tried adjusting drive gains but again no difference. Both cars have the same problem. When there is 500 LBS or more in the car there is a dramatic improvement. The sling is made out of formed steel similar to Dover design.Any ideas would be welcome!

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jkh

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28/05/2015 4:07 am

Jim,
Let me know when the first printing of you book hit the shelf! I can't wait...

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christycollett

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28/05/2015 6:28 am

JKH,

It's out and available thru Amazon

http://www.amazon.com/Elevator-Man-Stories-Years-Trade/dp/1453692282

Or "The Elevator World Book Store.

Enjoy,

Jim

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jkh

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28/05/2015 9:23 am

Got it...

Im looking forward to reading it.

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Leggy

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28/05/2015 7:54 pm

Curious if the cars have been static balanced, when extra weight is placed in car the vibration is better? Compensation whisper flexes have been added? Thrust bearings ? with new machines on old gearbox And yes agree with encoder mounting must be aligned perfectly other wise the drive will amplify vibration. Just a thought.

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traction

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29/05/2015 8:00 am

Originally Posted By: christycollett

(you know a guy that doesn't have that blank look on his face typical of most elevator men)

Really? Everyone has a job to do and no one spoke is more important to the wheel than the next.

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Len

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30/05/2015 12:52 pm

We encountered a similar problem on a 411 mod with existing Westinghouse 28 machine..after hooking up a chart recorder it was determined..the jitter from the ride matched the same from the machine mesh..harmonics from the drive..unfortunately the only way to fix this without changing out the machines..was to slowdown the cars.thus virtually reducing the jitter tremendously...

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uppo72

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30/05/2015 8:24 pm

Originally Posted By: christycollett

Another idea; years ago we had the same problem on a 1000 FPM car in Seattle. Drove us nuts, we did everything you guys mentioned above to no avail. Finally one of the Brighter Bulbs among us (you know a guy that doesn't have that blank look on his face typical of most elevator men) Guess the word he used was "Harmonics" It was combination of several things. His fix was to bolt a flame cut cwt filler on angles attached to the bottom of the Xhead. To give you an idea of the set-up. You could sit on the filler and operate the permit ally mounted car top inspection station. He moved the filler in and out until the vibration disappeared. Know it sounds kinda hokey but it worked.

Work Safe All

CC, is this an air dampener( to fix buffeting from wind resistance) or to adjust the hang of the car within the rails slightly different?

Maybe the last resort is to de-rate the load if the heavier weight fixes the problem?

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elevator_bg

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24/12/2015 1:09 am

Did you solve the issue? I am having similar problem with a new Sicor installed, ropes are changed, but when in the car you can feel with your feet a vibration when the machine stops. It also has a sound with the vibration, but theyare present only when the machine stops. The machine was checked and it's ok, the floor of the machine room is made of corrugated sheet metal type, which maybe makes resonance.

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jkh

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24/12/2015 4:40 am

AC VVVF?
Speed?
Floors?
Is the brake setting too soon?
Brake tension set correctly?
Does it vibrate more or less with capacity in the car?

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elmcannic

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24/12/2015 5:42 am

Off topic here, but nevertheless...

Last week I received a call from my area Inspector asking if I had any Motion 4000 Traction Controls on my route. "Nope". Evidently there is a problem within the drive or brake circuit (with at least one recorded accident). The Inspector told me MCE is sending out their Technical Bulletin, and they may even ask that you remove affected units from service until the repairs can be made.
I'm not sure what applications are suspect other than the MCE 4000 model traction controller. If you have or know of any recent MOD's using this model, please have the units serial numbers verified by MCE

Merry Christmas Forum Members

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jkh

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25/12/2015 12:44 am

Thanks for the info

Happy Holidays

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Smitty

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31/12/2015 7:55 am

Did the guys perform a self tune on the drive during installation?

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