hello.
I'm setting up beam-break detector. not from scratch mind you. I have a omron E3T-ST22 photoelectric sensor with a built in amplifier. there is a positive voltage output when the beam is interrupted.
http://www.ia.omron.com/product/item/e3t_1135g/index.html
I have set it up most of the way (that is, attaching blue wires to ground and brown ones to power. in this case 2 9V batteries (in series?) making about 17V of power. I'm using the same batteries to power both the emitter and the receiver. I don't know if that's ok or not.
I have tested it, and basically it works fine. When I align the emitter bean and the receiver, and measure the voltage across the brown and black wires, I read about 0V, as expected (and the green light is on as described in the specs). when I block the beam, I read 17V (and the orange light also comes on, again, as it should). This seems fine, but high. I was expecting the output to be around 1 or 2 volts. I don't know enough about these things to know whether something is wrong or not. On the ratings/performance section on the website it says this
Control output (Load current) 0 to 50 mA
Control output (Residual voltage)
(DC) 1 V Max. (Load current: Less than 10mA)
(DC) 2 V Max. (Load current: 10 to 50mA)
but i don't know what that means (residual voltage etc)
Also, I'm not sure what the "load (relay)" mentioned in the output circuit diagram on the website is. I don't know what a "load" is. is that just connecting something to the outputs from the power? I suspect it has something to do with making sure the current is less than 50 mA. I do have 2 330 Ohm resistors because I thought maybe that with about 18V, that would keep my current at about 27mA. I did connect the brown wire to the black wire through the 2 resistors. nothing seemed different. My level on these matters is VERY basic. please talk to me like I'm in 3rd grade. I'm intelligent but have no real background in these matters. It would be helpful if someone said "1) connect this to that, then 2) this to that" etc.
thanks,
a
I'm setting up beam-break detector. not from scratch mind you. I have a omron E3T-ST22 photoelectric sensor with a built in amplifier. there is a positive voltage output when the beam is interrupted.
http://www.ia.omron.com/product/item/e3t_1135g/index.html
I have set it up most of the way (that is, attaching blue wires to ground and brown ones to power. in this case 2 9V batteries (in series?) making about 17V of power. I'm using the same batteries to power both the emitter and the receiver. I don't know if that's ok or not.
I have tested it, and basically it works fine. When I align the emitter bean and the receiver, and measure the voltage across the brown and black wires, I read about 0V, as expected (and the green light is on as described in the specs). when I block the beam, I read 17V (and the orange light also comes on, again, as it should). This seems fine, but high. I was expecting the output to be around 1 or 2 volts. I don't know enough about these things to know whether something is wrong or not. On the ratings/performance section on the website it says this
Control output (Load current) 0 to 50 mA
Control output (Residual voltage)
(DC) 1 V Max. (Load current: Less than 10mA)
(DC) 2 V Max. (Load current: 10 to 50mA)
but i don't know what that means (residual voltage etc)
Also, I'm not sure what the "load (relay)" mentioned in the output circuit diagram on the website is. I don't know what a "load" is. is that just connecting something to the outputs from the power? I suspect it has something to do with making sure the current is less than 50 mA. I do have 2 330 Ohm resistors because I thought maybe that with about 18V, that would keep my current at about 27mA. I did connect the brown wire to the black wire through the 2 resistors. nothing seemed different. My level on these matters is VERY basic. please talk to me like I'm in 3rd grade. I'm intelligent but have no real background in these matters. It would be helpful if someone said "1) connect this to that, then 2) this to that" etc.
thanks,
a
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