Ac/Dc Common?
Ac/Dc Common?
(OP)
Stupid question probably
I am using a 120 ac single phase motor, a NC switch opens when a cam hits. I want to use the NO part of the switch to ground an input to a microcontroller (24 Vdc). What implications are there if the common part of the switch is tied to the Vdc- and AC neutral of the power supply? Noise?
Thank you.
dude
I am using a 120 ac single phase motor, a NC switch opens when a cam hits. I want to use the NO part of the switch to ground an input to a microcontroller (24 Vdc). What implications are there if the common part of the switch is tied to the Vdc- and AC neutral of the power supply? Noise?
Thank you.
dude





RE: Ac/Dc Common?
TTFN
RE: Ac/Dc Common?
Is the input into your micro through an optoisolator or is there any other isolation going on? I don't see any real issues with doing this other than the input signal may have to be cleaned up a bit from a noisy ground and the possibility of ground loops (probably not a big concern since this is an input into micro).
RE: Ac/Dc Common?
RE: Ac/Dc Common?
One gray area to me on this is the NEC. They may have something to say about this in their LV wiring.
RE: Ac/Dc Common?
I nearly had a eye taken out by an IC that exploded when I connected my scope ground to the circuit ground which was connected to AC neutral.
TTFN
RE: Ac/Dc Common?
RE: Ac/Dc Common?
RE: Ac/Dc Common?
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It may require some current limiting resistors or voltage divider. Not sure but definately worth checking out.
RE: Ac/Dc Common?
A longshot solution may be something like…
www.crydom.com/pdf/crydom_io_oac.pdf
RE: Ac/Dc Common?