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Gem Sensor Optical Switch wiring

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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Sun Sep 26, 2010 1:44 pm Post subject: Gem Sensor Optical Switch wiring

The diagram for wiring this switch to an inductive load (relay coil) doesn't compute for  me. Can someone explain why there's two voltage sources shown? 



The optical switch (40ma) in my fuel line  is being used to drive a pump relay (coil (at) 36ma)



Thanks,

J

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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Sun Sep 26, 2010 2:13 pm Post subject: Re: Gem Sensor Optical Switch wiring

Forgot the attachment. Here it is.

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ELS 900 Wiring.pdf

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retasker(at)optonline.net
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Posted: Sun Sep 26, 2010 3:40 pm Post subject: Gem Sensor Optical Switch wiring

I would guess that they show the two sources because one is labeled 5 or 

12 VDC (to power the sensor) and the other is unlabeled.  If you have 

the 12V version of the sensor, just connect the "+" of both supplies 

together.  Basically take the top schematic showing a resistor load and 

substitute the relay and diode from the lower schematic for the resistor 

and you have it.



Dick Tasker



jonlaury wrote:

 	  Quote: 	
		   



 The diagram for wiring this switch to an inductive load (relay coil) doesn't compute for  me. Can someone explain why there's two voltage sources shown?



 The optical switch (40ma) in my fuel line  is being used to drive a pump relay (coil (at) 36ma)



 Thanks,

 J





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=313800#313800



    


	


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enginerdy(at)gmail.com
Guest

Posted: Sun Sep 26, 2010 3:47 pm Post subject: Gem Sensor Optical Switch wiring

Hmm. Can I express my dislike for ambiguous datasheets here? Ok, now that that's done..



It may be expressing the fact that the blue wire, the optical receiver, does not care too much what its excitation voltage is. That is, even if you have a 5v or 12v part number, the voltage that drives the blue wire can be a wide range of values as long as it doesn't exceed 40mA if Blue is shorted to ground, as it will be when the sensor is triggered.



The datasheet warns you not to connect the Blue wire to voltage without a limiting load (some sort of resistor, whether it's a relay coil (as in the figure 'Relay Output'), or the pull-up resistor R (as in 'CMOS/TTL Output'), but as long as you do that, you can use either the 5/12v source or some other voltage source.



For your case, it sounds like a configuration like the figure 'External Load' might be the right way to do it, as long as there is a suppression diode in the coil.



This advice isn't authoritative, since I've never worked with a sensor exactly like this before, but just a guess (hopefully a good one) based on experience.



--Daniel



On Sep 26, 2010, at 5:13 PM, jonlaury wrote:



 	  Quote: 	
		   

 

 Forgot the attachment.  Here it is.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=313803#313803

 

 

 

 

 Attachments: 

 

 http://forums.matronics.com//files/els_900_wiring_144.pdf

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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Mon Sep 27, 2010 7:44 am Post subject: Re: Gem Sensor Optical Switch wiring

Dick and Daniel,



Thank you both for the elucidation.



John



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