2 Wire Inductive proximity switches

[FozzyTime]

Hi guys,

Im putting In a 2 wire proximity switches but been told that it does not need a supply to it (hence 2 wire), it can just be wired to the coil of the relay, im my case A1. I dont understand how these work. anyone shed any light on it for me?

Cheers

Mike

 

[kme]

If its an inductive switch, then it`ll "induce" (clue in the name) a voltage in the head, which could operate a coil - though it`ll only be momentary ( unless the other "half" of the switch IS powered?)

 

[FozzyTime]

thanks for the reply, then why would u ever use a 3 wire switch as you would need a psu to power it? Would it not make sence to just always use a 2 wire as no suplly is needed?

 

[binky]

details of the proximity would be useful

 

[steptoe]

He's close to Deke,

 

[Technician]

I am making a suggestion by writing this.

It could be that the operating method of

the proximity switch is that the electrical

properties of the circuit are altered by the

closure of the switch. This may explain

why it is only two wire.

The first thing I thought about was a change

in the dynamic impedance of the circuit

caused by the switch closure. The dynamic

impedance of electrical AC circuits alters

as resonance is approached. This may be

an explanation but I stand to be corrected.

 

[m4tty]

I am making a suggestion by writing this.It could be that the operating method of

the proximity switch is that the electrical

properties of the circuit are altered by the

closure of the switch. This may explain

why it is only two wire.

The first thing I thought about was a change

in the dynamic impedance of the circuit

caused by the switch closure. The dynamic

impedance of electrical AC circuits alters

as resonance is approached. This may be

an explanation but I stand to be corrected.

Hi tech how comes your text doesn't fill the post up widthways it stops half way. Whys that ?

 

[Sidewinder]

I doubt that the switch would power a relay coil.

As has been suggested, it would be useful to have the switch details.

BTW, most are inductive, they are more reliable, as long as what you are sensing will work with the switch.

 

[Technician]

Hi tech how comes your text doesn't fill the post up widthways it stops half way. Whys that ?

Matty; When I first began to type I had an old

sit-up-and-beg machine. I still have it. It is an

ornate model, with a beautiful key action and I

keep it well oiled.

You might think me crazy for paying

 

[steptoe]

and he has a return

key, just like this

one on my keyboard.

I hope this doesnt

catch on, takes me

hard enough typing

normally most days.

 

[Technician]

and he has a returnkey, just like this

one on my keyboard.

I hope this doesnt

catch on, takes me

hard enough typing

normally most days.

It's a return lever, Steps. It makes a

lovely sound as the carriage slides

down the guides after the ratchet has

rotated the scroll.

 

[OnOff]

Takes me back! I went through a period of changing a number of lever arm limit switches to 2-wire proximities years ago. Used Telemechanique ones to replace Telemechanique XCK-J ones! Worked a treat. Good link:

OsiSense XS & XT | Proximity sensors | Schneider Electric UK

In particular "Catalogue OsiSense XS cubic range"

Now mainly use Turck Banner.

 

[springcrocus]

There's some useful info here

 

[OnOff]

There's some useful info here

and here:

http://www.turckbanner.co.uk/654.htm

 

[ivor dispatch]

and here:http://www.turckbanner.co.uk/654.htm

best i have used and compatible with Mitsi

Gem 80s hate them

 

[OnOff]

best i have used and compatible with MitsiGem 80s hate them

And work fine with AB Micrologix kit...........