Sign up Calendar Latest Topics Donate
 
 
 


Reply
  Author   Comment  
Big Al

Sr. Member
Registered:
Posts: 102
Reply with quote  #1 
I've got a query out on the Rockwell forum, but my experience is that I get quicker and better answers here.

I'm currently using Enpac 2500's with Emonitor 3.7

I've been asked if I can provide a wireless solution to monitoring a motor/gearbox unit which drives a Clarifier Bridge in our effluent plant. It is exposed to all weathers and will be orbitting the circumference of the clarifier tank, hence no wires.

I'd like to post a more detailed description, but have been called away. Will drop back in later.

Thanks.
Big Al

Sr. Member
Registered:
Posts: 102
Reply with quote  #2 
The Clarifier tank is a large circular tank perhaps 60ft diameter and full of water. The bridge turns from a fixed bearing in the centre of the tank and is supported on the other end by a drive wheel, which runs on a track on the tank perimeter. The motor (1500RPM) drives a slow speed wheel (1 RPM) via a reduction gearbox. I would like to monitor the motor, gearbox and wheel bearings.

Currently I'm allowed access to the drive via a walkway and I can follow the the motor/gbx unit around the track as I collect vibration data as per a normal walk-around route. I also use ultrasound to monitor the slow speed wheel bearings. This is soon to change with the installation of a new bridge, after which no pedestrian access will be allowed while the bridge is operational. Access will only be allowed via an inter-locked gate that will kill the power.

I'm hoping to find a wireless solution for both the vibration and ultrasound technologies. I'm using a UE Systems Ultraprobe 10K and they have told me that there is no wireless option in the UK.
Walt Strong

Sr. Member
Registered:
Posts: 889
Reply with quote  #3 
Do you have AC power on the same structure that sensors will be mounted?
How are you now using the ultrasound a) listening, b) dB value, c) spectrum/waveform analysis? How many measurement points?
How many vibration measurement points/sensors?
Does all vibration and ultrasound data have to get AC analog signals into Enpac 2500 and into Emonitor, or can a separate system be considered?

This could get far too complicated and expensive! Why not get a special access permit; even if the unit has to be momentarily stopped to get on and off the merry-go-round? Keep singing "Bridge over troubled waters"!

Walt
MarkL

Avatar / Picture

Sr. Member
Registered:
Posts: 1,120
Reply with quote  #4 
Slight aside, But I think Ultrasound be best bet with the really slow stuff on this application as you'd be forever taking any vibe data of any use with the wheel bearings for instance. Have you seen this new system from UE systems? 
http://www.uesystems.com/products/remote-monitoring/4cast

As for the wireless, I think that imi sensors do a wire bridging product that lets you take an unbuffered output from a box remotely but I imagine its not cheap.
http://www.pcb.com/industrial_accelerometers/echo_wireless
Walt Strong

Sr. Member
Registered:
Posts: 889
Reply with quote  #5 
Al,

Another option would be to have permanent sensors (say 2-accelerometers for motor-gearbox and 2-UT sensors for wheel bearings) connected to a convenient terminal box that is reachable from a perimeter walkway (assuming there is one). You would then plug your analyzer or UE-meter to sensor terminals and walk along while taking the measurements. One vendor lists clarifier peripheral speeds of 8 to 14 feet/min., so you only need to walk 8 to 14 feet to collect a minute of data. If this is doable, then it is considerably cheaper than wireless sensors or full wireless system.

Let us know what you decide to do with this "stinky" project!

Walt
Big Al

Sr. Member
Registered:
Posts: 102
Reply with quote  #6 
Thanks for the responses guys.

AC power will be available at 415V, 110V and 24V. I've also been informed that there will be an Ethernet connection. Any signal leaving the bridge will have to do so via slip rings. I don't know how this might affect the signal. To make matters worse, the motor will be variable speed (inverter driven).

I'm currently using ultrasound to listen to the wheel bearings. I usually monitor 3 complete revolutions of each bearing and store the dB level as a trend in Ultratrend DMS. I don't bother with the spectralyzer software. This method has worked successfully for me to call a couple of damaged bearings over the years.

The number of measurement points is growing as I'm drip fed more information. There will be a relatively small vertical drive comprising of motor-reducer-gearbox. I think I'll get away with one accelerometer per component (3). There will also be four vertical pumps attached to the bridge and I'm guessing at one accelerometer on each motor and one on each pump (4x2=8). That gives a total of 11 accelerometers. I actually have the option of just remoting the pumps to a switchbox on-board the bridge, as they will still run when the bridge rotation is stopped.

The new bridge will actually be supported on two wheels, so four bearings requiring four ultrasonic sensors.

I don't think that plugging into the system as the end of the bridge passes would be practical, as I would only have a window of about a minute, and then have to wait another 20min for the next reading. I would expect health and safety to rule it out anyway.

Ideally I would like to get the data back into our existing systems, but new, standalone systems would be acceptable. A system that logs data to be uploaded later, is also acceptable.

I'm aware of the 4Cast system and I've got the Regional Manager from UE Systems on site in a couple of weeks to get his recommendation.

I haven't had a chance to read up on the Echo wireless system, but will do when I get the chance. Thanks for the info.

I'll be humming Bridge Over Troubled Waters all afternoon, but the question is, whose version? Elvis or Simon & Garfunkel?
Walt Strong

Sr. Member
Registered:
Posts: 889
Reply with quote  #7 
Al,

For a standalone monitor system, take a look at WiVib 8/8 Pro

https://iconresearch.co.uk/2017/07/01/ground-breaking-wivib-88-pro-data-acquisition-unit-launched/

It offer 8-dynamic channels with Ethernet or Wireless connection to PC. You may not need ultrasound sensors if accelerometers with demodulation is used, or take the AC signal from the UE ultrasound sensors and use the dynamic channels of the monitor.

Walt

Big Al

Sr. Member
Registered:
Posts: 102
Reply with quote  #8 
Walt,

Printed off and sitting in my "to read" pile along with the Echo Wireless system. Thanks.
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.