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Morning All. 
Raining steadily here, and not very warm.
Have a great day.
Raining steadily here, and not very warm.
Have a great day.
I would just like to say
- Thread starter Hippo
- Start date
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- Benfleet, Essex
It is one of these.
Meant to be very accurate. The sensor is a normal 3-wire power & pulse with a magnetic polarity sensitive transducer.
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- 44,813
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- East Dorset
Absolutely the best of luck that this time it gets dun!Mornin
Plasterer returning shortly to finish me hall
Rainin now and forecast it all bloomin day
stay dry all
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- 44,813
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- East Dorset
More like proper rain here, we too had snow forecast, can't see it happening anytime soon.
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- 22,901
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- In the next Glen
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- 22,901
- Location
- In the next Glen
I get the feeling that, on the quiet, you are quite an electronic whizz. I take off my bunnet to you!
No so shhhhhhh
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- 22,901
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- In the next Glen
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- 44,813
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- East Dorset
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Not cold but VERY wet 'ere.Not yet tis mighty bitter.
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- uk
Been sleeting and snowing all morning here in my bit of Linkinshirshire. Starting to settle anorl.
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- 16,352
- Location
- Benfleet, Essex
The Tacho/RPM meter for the lathe is still fighting me.
I put ferrit supressors on power in/out and 3-phase out. I expect to be hearing from the RSPCA later as ferrit suppression may be an offence.
I tried a test of the tachometer with just the RPM box of tricks and the VFD powered on but not "started" (i.e. delivering any 3-phase output). This was using a cordless drill and a magnet as suggested by @Bobsticle of this parish and as expected all works fine steady numbers and responds to varying speeds of the drill; solid as a rock.
However, start the VFD delivering actual output and everything goes belly up.
So it is pure and simple the level of EMI/RFI escaping the VFD that screws everything up.
I wonder if putting it in a grounded biscuit-tin would help?
I put ferrit supressors on power in/out and 3-phase out. I expect to be hearing from the RSPCA later as ferrit suppression may be an offence.
I tried a test of the tachometer with just the RPM box of tricks and the VFD powered on but not "started" (i.e. delivering any 3-phase output). This was using a cordless drill and a magnet as suggested by @Bobsticle of this parish and as expected all works fine steady numbers and responds to varying speeds of the drill; solid as a rock.
However, start the VFD delivering actual output and everything goes belly up.
So it is pure and simple the level of EMI/RFI escaping the VFD that screws everything up.
I wonder if putting it in a grounded biscuit-tin would help?
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- 6,592
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- uk
Only if you scoff the biccies firstI wonder if putting it in a grounded biscuit-tin would help?
Stone56
Well-Known Member
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- 3,213
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- Up a mountain
Love the wallpaper
Stone56
Well-Known Member
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- 3,213
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- Up a mountain
Stone56
Well-Known Member
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- 3,213
- Location
- Up a mountain
Crikey I see the forecast and the yellow and amber warnings for snowIt was good here too, I did comment to a fellow dog walker that it almost felt like a spring day.
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- 16,352
- Location
- Benfleet, Essex
I am doing a little "Happy Dance" 
because the lathe rev-counter is working 100%.
The item bought from Amazon came in a box with "Zero/Zilch/Denada" info as to "how".
I've been struggling all day with ferrite noise suppressors etc. etc. all to no avail. :-(
Then I did a google search online and up popped an e-bay link to a similar product to mine (AC powered) but it offered 2 variants. Unshielded sensor, or "Shielded Sensor". Now I just added a shield to my sensor yesterday and it made NO difference. But, when reading this e-bay seller ad it became clear that for usage where there is possibly RFI/EMI from a VFD you should buy their shielded version and attach the sensor shield NOT TO EARTH but to the -ve terminal of the sensor connection to the tacho.
Boom! and I am a very happy man.
l
because the lathe rev-counter is working 100%.The item bought from Amazon came in a box with "Zero/Zilch/Denada" info as to "how".
I've been struggling all day with ferrite noise suppressors etc. etc. all to no avail. :-(
Then I did a google search online and up popped an e-bay link to a similar product to mine (AC powered) but it offered 2 variants. Unshielded sensor, or "Shielded Sensor". Now I just added a shield to my sensor yesterday and it made NO difference. But, when reading this e-bay seller ad it became clear that for usage where there is possibly RFI/EMI from a VFD you should buy their shielded version and attach the sensor shield NOT TO EARTH but to the -ve terminal of the sensor connection to the tacho.
Boom! and I am a very happy man.
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- East Dorset
Bin rainin all day here, had to put me boots and souwester on to put the bins out. It gets to 3 inches or so around the far end of the garage where the gate is.Not cold but VERY wet 'ere.
Last edited:
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- East Dorset
Managed to drop a, thankfully not too big, piece of worktop on me foot.
As I pointed out to W if I'd been wearing my steelies it'd have made no diff as it fell on the part of my foot about 3 inches above where the toecap ends. I didn't exactly drop it, I'd attached it to the sink with two of the sink mounting clip type things as I was messing about trying to get the cabinet below where it will be going to as near as I can the right height so I don't have to recut holes in the back board for the water pipes and drain. Somehow it came detached as I was turning the sink over and around.
Had to reposition the clips as the noo top is thicker, by a bit. That was a battle having to push the wretched tongue thing in while fiddling the rest of the clip mounting around to get it to slip up (or down if the sink was the right way up!) to the next hole in the vertical metal edge.
Progress on this thing is very slow as I procrastinate like mad cos i have got sooo bored with the job.
I keep trying to tell myself, "Get on and get the flipping thing done." But I don't listen. Spend too long on tinternet and nattering to you lot!!!
Have a good evening!
As I pointed out to W if I'd been wearing my steelies it'd have made no diff as it fell on the part of my foot about 3 inches above where the toecap ends. I didn't exactly drop it, I'd attached it to the sink with two of the sink mounting clip type things as I was messing about trying to get the cabinet below where it will be going to as near as I can the right height so I don't have to recut holes in the back board for the water pipes and drain. Somehow it came detached as I was turning the sink over and around.
Had to reposition the clips as the noo top is thicker, by a bit. That was a battle having to push the wretched tongue thing in while fiddling the rest of the clip mounting around to get it to slip up (or down if the sink was the right way up!) to the next hole in the vertical metal edge.
Progress on this thing is very slow as I procrastinate like mad cos i have got sooo bored with the job.
I keep trying to tell myself, "Get on and get the flipping thing done." But I don't listen. Spend too long on tinternet and nattering to you lot!!!
Have a good evening!
Stone56
Well-Known Member
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- 3,213
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- Up a mountain
Gets much deeper you best put on your swimming gearBin rainin all day here, had to put me boots and souwester on to put the bins out. It gets to 3 inches or so around the far end of the garage where the gate is.
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- 44,813
- Location
- East Dorset
We've had it deeper. Luckily it just pools there, don't even creep into the garridge.Gets much deeper you best put on your swimming gear
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