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AC-line close to the Prop, trouble? — Parallax Forums

AC-line close to the Prop, trouble?

MoskogMoskog Posts: 554
edited 2010-08-27 11:32 in Propeller 1
Hello, being into the Stamp-world for some years I'm finally heading forward to the Propeller.
My first project is including two relays to control AC-motors (some 230V/50 watts each) on-off.
On my PCB I placed the relays just about 5 cm away from the Propeller, that means the 230V AC-lines also will be at the same distance.
Will I face trouble with the AC that close to the Prop and the low volt cirquits nearby?

Comments

  • Erik FriesenErik Friesen Posts: 1,071
    edited 2010-08-27 05:34
    Likely that won't be a factor. That is more related to board design. Did you place a ground plane, etc? Show us your board.
  • MoskogMoskog Posts: 554
    edited 2010-08-27 06:34
    The AC ground plane will be present but is isolated from the low volt cirquits. Attached is a picture of the PCB-board. The Propeller proto board will be placed above the left area on the PCB, 10 mm above. Copper layer below is common ground.
    relays.jpg
    738 x 502 - 116K
  • Erik FriesenErik Friesen Posts: 1,071
    edited 2010-08-27 11:32
    I'd say it will be fine. One thing that could cause you some trouble is the collapsing field on the ac when switching off. Really you should have some TVS's or cap/resistor combo on the high side switch.
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