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marksl

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Reply with quote  #1 
Hello,

Can someone tell me how to configure a collection point for a permanent vibration sensor which is already powered, so power needs to be switched off from the data collector.
We recently installed some permanent sensors for a client who is using Dynamix 2500 data collectors and they aren't sure how to do this

Thanks

Mark
OLi

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Reply with quote  #2 
There are no technical problems supplying IEPE sensors from 2 sources I have done it a lot with CSI stuff when I had to, the supply currents are just added and make no change as far as I know. In my case it was sensors connected to a SKF on-line box older version and a CSI 2120 so it was awhile ago but IEPE does not change.
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Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
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Curran919

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Reply with quote  #3 
https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1441-um001_-en-p.pdf

page 57, there is a settings toggle for ICP. Turn that off and the 2500 wont power the channel.

However, as Olov said, many sensors are designed to accept up to 20mA ICP power, with most DAQs only supplying 2-4mA. So if you hook them up in parallel, the sensor should handle the current. You should check with the sensors first though, assuming you cant turn the ICP off of the 2500.
marksl

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Reply with quote  #4 
I'm still confused as I have never used these data collectors, but it looks like they would need a new transducer type setup (Page 76) with the input type changed from ICP Accel to AC Coupled and then reference this transducer for the measurement location with the battery powered sensors only. Is this correct?
Curran919

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Reply with quote  #5 
Wait wait... you have battery powered sensors that are not wireless?

I've never used a rockwell before either, but what you are saying makes sense.
OLi

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Reply with quote  #6 
Make sure your battery toy do supply the sensor when you collect data and that it is a IEPE interface if you can't turn off power supply. Normally on battery you would have a 3 wire sensor as IEPE is a wast of energy but there are all variations existing.....


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Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
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RRS_Dave

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Reply with quote  #7 

Quote:
Originally Posted by marksl
I'm still confused as I have never used these data collectors, but it looks like they would need a new transducer type setup (Page 76) with the input type changed from ICP Accel to AC Coupled and then reference this transducer for the measurement location with the battery powered sensors only. Is this correct?


That is the way I would do it. I always set up an AC powered transducer then use that for these type instances.

D

Big Al

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Reply with quote  #8 
Marksl,

If I've understood the problem properly then your last suggestion is correct.

We have some 4-20ma powered accels which send overall values to the process control system. I can tap into these with my Enpac 2500 via a BNC and collect route based spectra as per a normal walk-about route.

Setup - Transducers - New (name your transducer and define the base unit - acceleration)

Setup - Calibration - Collector Type Dynamix 2500- Find your accel in the list - Input type AC Coupled, Units g's, Calibration Value 100 (if sens = 100mV/g), DC Offset 0

Then if you edit the collection spec, you can select the new Transducer from the dropdown list. You may want to write a new collection spec instead.

Hope this makes sense and is of some use to you.

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