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Anonymous Poster

Vibration Monitoring System ?

08/17/2009 10:09 AM

Could someone please explain that what exactly the purpose of using Key Phasor is. What does it do and what type of angle is shows ?

Thanks In Advance.

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Guru

Join Date: Oct 2008
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#1

Re: Vibration Monitoring System ?

08/17/2009 7:50 PM

Please produce a question of at least three sentences explaining type of monitoring equipment, and type of equipment monitored.

And, if you are not part of a witness protection program, your general location would be nice, too.

And, a hint of your technical competence surely wouldn't blow your cover.

You're not masquerading as a noise and vibration cancellation expert, are you?

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Anonymous Poster
#3
In reply to #1

Re: Vibration Monitoring System ?

08/18/2009 12:48 PM

Bently Nevada 3300 is the name of the system; and the KEY Phasor is installed at the end of the shaft, observing a hole.

I'd like to listen your answer as well, as I have read lot of your Good answers on this site.

Thanks.

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Guru
Engineering Fields - Mechanical Engineering - New Member Hobbies - CNC - New Member

Join Date: Aug 2006
Location: Western Australia
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#2

Re: Vibration Monitoring System ?

08/17/2009 9:05 PM

Very basically:

A key phaser measures (usually) a once per revolution event such as a small hole or a key. This enables one to relate the measurements from the radial probes (x and y probes) to an actual position (angle) of the shaft during a revolution.

Knowing the angle one can tell when a rotor goes through a critical for example as the "phase" of the vibration (imbalance) shifts. It also makes possible things like Bode plots, orbits etc.

For balancing of rotors you need to know the "angle" of the "imbalance". This is given by the key phaser.

Now if you want to get really technical give SteveS a call.

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Anonymous Poster
#4
In reply to #2

Re: Vibration Monitoring System ?

08/18/2009 12:54 PM

Sir, Thank you very much for your answer.

Could you please tell me how much voltage should be adjust at Key Phasor, I think voltage doesn't matter, any where from 4 to 10 can be adjusted. Only think matters is cycle which it detects. Am I right?

Thanks!

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Commentator

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Location: texas
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#5
In reply to #4

Re: Vibration Monitoring System ?

08/19/2009 1:50 AM

Hi, the key phasor voltage needs to be adjusted to 10 vdc making sure that the probe is not looking at the "hole" or notch when setting it.

10 volts is in the midrange of the linear curve of the proximitor, if you set it at 4 volts and depending of the deepness of the notch you are taking a risk of going into the non linear bottom section of the priximitor's curve.

The keyphasor is more less a reference point for making repairs to the shaft it can also be used to display rpm and to differentiate between vibration and misalignment.

Hope this helps

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#11
In reply to #5

Re: Vibration Monitoring System ?

10/17/2009 1:56 PM

Hi wrenchpuller!

I have to ask something and I think you're the only one I can ask from. This is regarding the same, Bently Nevada Vibration Monitoring System. My Question is why is there Negative voltages used in proximitor? I can't understand it, people often ask this questions, I have some answers to this though, I am not sure.

Please reply me.

Thanks.

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Guru
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#6
In reply to #4

Re: Vibration Monitoring System ?

08/19/2009 4:52 AM

Hi Guest,

May I suggest that for details of the actual 3300 system set-up you try this forum and ask your questions there.

GE web site also has many application notes, you should find your answers here.

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Anonymous Poster
#7
In reply to #6

Re: Vibration Monitoring System ?

08/19/2009 11:00 AM

Thank you very much for the link.!!

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Anonymous Poster
#8
In reply to #2

Re: Vibration Monitoring System ?

08/19/2009 11:04 AM

Thanks wrench puller !

I had to ask these two questions, and you answered both of them. My first question was posted as "Eddy Current Transducers". You gave me very usefull answers there as well.

(By the way, Who's SteveS ?)

Thanks again!!

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Commentator

Join Date: Dec 2007
Location: texas
Posts: 92
Good Answers: 8
#9
In reply to #8

Re: Vibration Monitoring System ?

08/19/2009 10:28 PM

Hi guest... no problem buddy

what part of the world are you located?

En que parte del mundo te encuentras?

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Active Contributor

Join Date: Aug 2009
Posts: 16
#10
In reply to #9

Re: Vibration Monitoring System ?

08/20/2009 1:40 PM

I'm from Pakistan. I have created account now.

In which language did you write?

It is perhaps, the same question you asked in english first.

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Participant

Join Date: Feb 2011
Posts: 2
#12

Re: Vibration Monitoring System ?

02/19/2011 9:47 AM

key phaser is using for rpm and it will connect only 1 using in turbine.And it will connect radial position

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