24 volt proximity switches

**Bob Willson** · 18th July 2011, 11:41 AM

Originally Posted by wbleeker

I haven't got a lot further, most of the wiring is done one thought that occurred to me is I now have three outputs for the limits? Do I just bridge them together and connect one wire to the BOB?
The next step is getting inside the machine to access the VFD, has anyone connected a Fuling DZB200 VFD to a DC-03 I am not sure if the VFD terminals are marked the same as on the board.
Will

Hi Will
I would suggest that the best way to connect the limit switches is to put them in series and just use the one wire from the BOB.
As to the other thing with the VFD, I haven't used a Fuling DZB200, but I did write this guide for connecting the DC-03 and VFD using a HuanYang VFD. It is on this BB.

Bob Willson

**twistedfuse** · 18th July 2011, 12:05 PM

I'm with Bob on this one, having the limits in series is a better idea then parallel.

Bob, gee, didn't realise that the VFD saga was almost a year ago. How time flies.

Daniel

**wbleeker** · 18th July 2011, 05:00 PM

Okay how do you wire the proximity switches in series, they have three wires?
I can wire the positive to negative in series but what do I do with the signal wire?
Will

**twistedfuse** · 18th July 2011, 05:47 PM

Good question, maybe a parallel setup is going to be easier...lol. Didn't think that far ahead. lol.

Daniel

**Bob Willson** · 18th July 2011, 06:31 PM

You would connect the positive from the first one to the negative of the second one, then from the second one's positive to the third one's negative etc.
So long as the current is flowing there is 24volts appearing at each switch. (Assuming normally closed)

Bob

Edit:
Sorry, just re-read what you said. Three wires? what are they designated as? Then again, as soon as any of the switches go high, that should send a signal; so it is a combination of series and parallel from the looks of it.

Edit 2:

Please be so kind as to completely ignore whatever I may have thus far said, while I actually think about the problem.

**Bob Willson** · 18th July 2011, 06:59 PM

It is vaguely possible that this document has the information that you require.

**wbleeker** · 18th July 2011, 08:05 PM

Thanks Bob, I had a read of that document, I am thinking that I could wire them parallel and them just use one module on the opto board but I don't know that if more than one limit trips at the same time will the signal voltage stay at 24 volts? will it double or triple?
The other option ( I think) is to leave it how it is setup now using three modules
and have some sort of way to limit the signal voltage to 5 volts if more than one limit trips?
Any suggestions
Will

**Bob Willson** · 19th July 2011, 09:47 AM

Well it is certainly easy enough to limit the voltage to 5v.

sjm has supplied a circuit for exactly that just a few days ago.

**Bob Willson** · 19th July 2011, 09:56 AM

Why don't you just do a couple of tests? Wire the switches up and then measure the various voltage outputs from the signal wires. I should think that it will only need a diode in each signal line to stop feedback.

**wbleeker** · 19th July 2011, 05:55 PM

It looks like I will get a bit of time tomorrow to have a play with it, I will post the results
Will

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