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3rd May 2019, 03:52 PM #16
RPM-meter-schematic-diagram-alternative.jpg
Is this how you wired it ?
Rick
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3rd May 2019, 04:02 PM #17Most Valued Member
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Rick
yes thats it
peter
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3rd May 2019, 04:52 PM #18Diamond Member
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I have the same Tacho and mine is wired the same way. Led on the sensor is on and the Tacho display reads 0000 without machine running. Not sure what is going on with yours. It is unusual with two giving you the same result.
I am powering mine with a 9V plug pack from an old cordless phone. Have you checked what voltage yours is putting out with a multimeter?
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3rd May 2019, 04:55 PM #19Diamond Member
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I just disconnected the sensor and it still will read 0000, does yours do the same or will it still display 5997 RPM?
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3rd May 2019, 05:48 PM #20Most Valued Member
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My power supply is putting out 14V. I think I have a couple of 12v plug packs which I'll dig out tomorrow although as the Tacho is supposed to run on 8-24V I cant see how that would be a factor. However desperate men etc.
When I disconnect the sensor the readout displays 0000
I've just gone and checked both, they are almost exactly the same. I have also swapped the sensors with no difference.
I wish I could get the same sort of odds buying a lottery ticket.
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3rd May 2019, 06:12 PM #21Diamond Member
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Is your sensor an NJK-5002C?
https://www.ebay.com.au/itm/NJK-5002...frcectupt=true
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3rd May 2019, 06:28 PM #22
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3rd May 2019, 06:42 PM #23Most Valued Member
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3rd May 2019, 06:44 PM #24Most Valued Member
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Not that I have noticed
Do you have a photo of your wiring just in case you missed something, not that I doubt you but stranger things have happened
Rick[/QUOTE] Better than that. This link is to the short video I made of the first tacho to send to Banggood.
https://youtu.be/X1iziOhrMK4
I think i have the wiring correct but I'm certainly open to be corrected if I havent.
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3rd May 2019, 07:09 PM #25
Peter,
If you have the wiring correct then there should be the LED on and it gets brighter when the magnet is in close proximity, I also think that it is pole sensitive (i.e. it likes one side of the magnet to the other)
It is very hard to see the wiring as it is twisted and the camera is moving so a photo would be better, also a photo of the sensor showing the diagram on it
Rick
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3rd May 2019, 09:00 PM #26Most Valued Member
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Rick.
The orientation of the magnet doesnt change anything. I have just tried it from both sides.
Yes the LED does get brighter when the sensor is closer to the magnet. Changes approx 6 or 7 mm from the magnet.
Whe the sensor is not close to the magnet the readout shows this.
tach numeral.jpg
Closer than 6 or 7 mm the LED is brighter and the read out shows this
tach bar.jpg
Wiring pic
wiring.jpg
sensor
label
digram 02.jpg digram 01.jpg sensor 003.jpg
thanks
Peter
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3rd May 2019, 11:50 PM #27Senior Member
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I'd try a different power supply. Yours may not be filtered well enough. Even a battery - say cordless drill battery.
Russ
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4th May 2019, 12:35 AM #28
If I remember correctly I had problems when I first tried hooking one up and realised I had a AC powerpack so using another source would be a good suggestion.
I went out to my shed and checked the wiring on mine and it is exactly the same as yours Peter so the power supply look to be the only thing to change now
Rick
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4th May 2019, 09:41 AM #29Member: Blue and white apron brigade
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4th May 2019, 11:34 AM #30Most Valued Member
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I tried a 9V plug pack supply just now and the results look very encouraging. Learn something new everyday. It gives a read out that is very close to what I'm getting from the hand held optical one I have here. Next step is to see if it works with the 12V supply I have on the mill for running the lights and the fans in the VFD enclosure.
Thanks so much to all who have offered suggestions. I really appreciate the help.
Peter
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