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Thread: Ac SSR issue

  1. #21
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    Default Re: Ac SSR issue

    Ah I see so so in effect wire a switch between the output of the opto to the input of the gate on the triac, but still leave the resistor in circuit?
    Nope you mean across the input and out pins of the mocs triac ? Leaving in the resistor.
    Last edited by masterful; 10-10-2015 at 07:09 PM. Reason: Read post
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  2. #22
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    Default Re: Ac SSR issue

    The board design is based on the SSR neon, however it squeezes 8 channels onto 1 board in 2 four channel sets.
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  3. #23
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    Default Re: Ac SSR issue

    Quote Originally Posted by masterful View Post
    The board design is based on the SSR neon, however it squeezes 8 channels onto 1 board in 2 four channel sets.
    Ok, I gathered that from your photo, but I was trying to establish whether your board design has ever worked, or if this is the first time your board is being tested?
    What if the triac is physically reversed due to say a layout error, or silkscreen error, or parts misplaced, or wrong values used?

    I don't want to get involved giving step by step procedures for testing the triac using AC line voltage levels, unless you are well versed in electricity.
    I can't see over your shoulders and observe what you are doing.

    This would be safer: http://www.circuitstoday.com/how-to-test-a-triac
    Last edited by LightUp; 10-10-2015 at 07:53 PM.

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  5. #24
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    Default Re: Ac SSR issue

    I appreciate that.
    Im a qualified electrical engineer. So I'm well aware if the dangers of this task in hand.
    I've checked through the board traces with a Meter. All are good.
    I have some moc3021 optocoupler which I will swap out tomorrow and see what happens.
    I appreciate your advice and thoughts.
    80+ plus channels

    2 x 32 channel custom build tlc5940 dimmable DC controllers.
    1 ren 48 LSD v3c
    All rgb strips and 1 custom made face.

  6. #25
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    Default Re: Ac SSR issue

    Quote Originally Posted by LightUp View Post
    Ok, I gathered that from your photo, but I was trying to establish whether your board design has ever worked, or if this is the first time your board is being tested?
    What if the triac is physically reversed due to say a layout error, or silkscreen error, or parts misplaced, or wrong values used?

    I don't want to get involved giving step by step procedures for testing the triac using AC line voltage levels, unless you are well versed in electricity.
    I can't see over your shoulders and observe what you are doing.

    This would be safer: http://www.circuitstoday.com/how-to-test-a-triac
    Thank you
    80+ plus channels

    2 x 32 channel custom build tlc5940 dimmable DC controllers.
    1 ren 48 LSD v3c
    All rgb strips and 1 custom made face.

  7. #26
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    Default Re: Ac SSR issue

    Well after all I think I've found the problem.
    I made a PCB design error. Please buzz in and tell me I'm right. I have the triac terminal t1 connected to output to terminal of the load and t2 connected to input line voltage. They should be the other way round.

    Am I correct in this diagnosis?
    80+ plus channels

    2 x 32 channel custom build tlc5940 dimmable DC controllers.
    1 ren 48 LSD v3c
    All rgb strips and 1 custom made face.

  8. #27
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    Default Re: Ac SSR issue

    It is the center pin of the output triac that goes to the load, which according to the datasheet is A2.
    A1 will be the neutral line connection. Not sure how these align with your T1, and T2.

    I dug out my RPM DMX16AC board which has 16 channels with a similar circuit topology as your board. With the circuit board assembled and without removing parts, I can take a 2.7K ohm resistor clipped to the MOC output on one side and tap the other side of the resistor to AC LINE IN and the lights come on with each tap.
    That's as simple as I can make a triac in-circuit tester.
    The test resistor value (randomly grabbed from my junk box is 2.7K) is obviously not critical.
    Last edited by LightUp; 10-11-2015 at 01:50 PM.

  9. #28
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    Default Re: Ac SSR issue

    Hi there.
    Yes it was a reversed output input pins on the PCB. A quick swap round with an insulated jumper to the gate pin and we are back in play.
    Thanks again for the help.
    Matt
    Last edited by masterful; 10-12-2015 at 07:01 PM. Reason: Spelling error
    80+ plus channels

    2 x 32 channel custom build tlc5940 dimmable DC controllers.
    1 ren 48 LSD v3c
    All rgb strips and 1 custom made face.

  10. #29
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    Default Re: Ac SSR issue

    Quote Originally Posted by masterful View Post
    Hi there.
    Yes it was a reversed output input pins on the PCB. A quick swap round with an insulated jumper to the gate pin and we are back in play.
    Thanks again for the help.
    Matt
    Yes, THANKSGIVING DAY (in Canada) was a good day for me too.

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