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Old 04-05-2017, 09:47 AM
luke_barber luke_barber is offline
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Join Date: Dec 2015
Location: Denver
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Default NPN or PNP Output?

I moved my Shopbot and the only problem that I had was a broken proximity sensor. I found the sensor listed at this datasheet . I'm not sure if I need the NPN or the PNP version? There's no clear identifiable markings on the broken sensor. Any help would be greatly appreciated.
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Old 04-05-2017, 11:13 AM
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terry lingle terry lingle is offline
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Location: Birch Island, BC, Canada
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which you will need depends on the design of your unit only a schematic or the manufacturer or someone with the same unit and the ability to determine which it is can tell you which you need.
Life beats the alternative hands down.
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Old 04-06-2017, 12:02 AM
yooper yooper is online now
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Location: Ontonagon
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You could just order one of each , but npn is way more common than pnp if I were to guess at it .
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Old 04-06-2017, 02:40 AM
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bfjou812 bfjou812 is offline
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Location: Winter Haven Fl.
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Are you able to see how it is wired ? On the NPN the brown and black are wired to the + terminal and the blue goes to the - terminal.
on the PNP, the blue and black go to the - terminal and the brown goes to the + terminal.
As Terry said , you will really need to check your schematic.
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Old 04-06-2017, 06:28 AM
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alchemist alchemist is offline
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Location: New Orleans
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look at one of the other ones. If the light comes on when the sensor is activated it is an NPN. If the light is on and goes off it is a PNP.
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