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Thread: AW12 Voltage Trip Level On Two Way Light Circuit

  1. #1
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    Default AW12 Voltage Trip Level On Two Way Light Circuit

    Hi

    This is my first post on here so please be gentle!

    I have a two-way light circuit with 4 mains switches on a UK 240VAC system. The incoming feed is on a light switch that also has a neutral fitted to the box. The supply to the physical lights leaves this switch as well. The 4 switches drive 3 CFLs and are working fine with no AW12 fitted.

    I would like to convert this switch to X10. I purchased a Marmitek AW12 module that has been installed on the output wire to the lights for the switched contact. The AW12 works fine via X10 but intermittently via the physical switches. On measuring the voltage that the switch provides I get 240V when the switch is on but I get 48V when the switch is off, with respect to neutral. I believe this voltage is being induced due to the proximity of the wires in the two way cable. Is there any way an AW12 can be told what the 'off' voltage threshold is? I think the AW12 is assuming that 48V is still on, not off when the switch is operated.

    I've checked the resistance from the local neutral back to the consumer unit and it is good. The neutral I'm testing against is fine.

    I'v tried another AW12 and I get the same problem. If I try either AW12 conected directly to a single mains switch they work fine, I don't think my brand new AW12s are faulty.

    Another option I have is puting a mains relay on the output of the switches and then using this to turn the input of the AW12 on and off. This should fix the issue but it is a little messy and requires a relay that will be 'off' when 50VAC as applied, on when 240VAC is applied.

    Any ideas will be apprecaited!

    Many thanks

  2. #2
    Moderator toscal's Avatar
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    When you checked the output voltage did you do it with the CFL connected. If you did then do it without.
    Do you hear a click when the module turns on.
    Also try the module with a normal bulb. And see what happens.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.
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  3. #3
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    Quote Originally Posted by toscal View Post
    When you checked the output voltage did you do it with the CFL connected. If you did then do it without.
    Do you hear a click when the module turns on.
    Also try the module with a normal bulb. And see what happens.
    Hi

    Thanks for your help.

    I checked the voltage with the CFLs in place and also when they were removed. I get up to 50V between the output of the switches/input to the AW12 and neutral with the 3 CFLs fitted or not.

    When the module operates I can hear a click as the relay cuts in. When the lights do not change state when I throw the physical switch the relay doesn't operate.

    I've tried the module with normal bulbs and I get the same problem. I get the same problem when no bulbs are fitted too, if the output voltage of the switch to the module gets too high the AW12 doesn't act on the change in voltage and then doesn't turn the relay on or off.

    Thanks
    Last edited by Jim.Toola; 26th December 2010 at 11:27 PM.

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