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Infared lights

Discussion in 'Troubleshooting and Repair' started by revengus, Jun 16, 2010.

  1. revengus

    revengus

    4
    0
    Jun 14, 2010
    Hi,
    I have some infared securtiy lights (PIR) that detect motion, but gradually 2 or 3 of them have started to just stay on when I turn the switch on,
    Anyone got any experiennce of this?
     
  2. davenn

    davenn Moderator

    13,293
    1,757
    Sep 5, 2009
    ...Initially you need to open them up and check for spiders etc etc inside the units
    they drive PIR's crazy.
    ...check that the PIR's are clean from dust etc.
    ...check the operation of the PIR cct it probably have a relay output, see if you can determine if its triggering. maybe its stuck in the triggered mode either cuz its failed or it has voltage across the coil all the time determine which one of those
    ...determine if moisture has got into the system and corrosion is possibly shorting out the cct and causing false operation.
    ...check the sensitivity adj trimpot and see if it has any effect on operation

    those are a few things to check
     
  3. revengus

    revengus

    4
    0
    Jun 14, 2010
    Cheers for the inof, checked it all out and no apparent shorts / burning or anything else obvious. Can't hear the relay triggering and the pots do nothing. I noticed this one does nothing at all now so I totally by-passed the PIR cct and am using it as a normal floodlight for now. I will take the other one apart later and see what that looks like.
    Incidentaly, the pots are marked eg. 500K730M and 2M733K are the ohm ranges or just part numbers?
     
  4. davenn

    davenn Moderator

    13,293
    1,757
    Sep 5, 2009
    I would take those to be 500K Ohms and 2 Meg Ohms respectively

    not sure what the 730M and the 733K markings would be

    cheers
    Dave
     
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