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Zone changing resistance intermittently..

  • 07-10-2018 11:12am
    #1
    Pauley2
    Registered Users, Registered Users 2 Posts: 96 ✭✭


    Europlex/Signet 200 w a zone through an expander whose resistance fluctuates between 2k2, 3k9, 4k6, all the way to 25k when I "Monitor" the zone. (at the moment I have it isolated to prevent false alarms).

    It doesn't seem to be the expander because I put a resistor across the terminals and it stayed stable.

    Something in the zone, somewhere in the hidden cabling.

    Anyone come across this before and any idea of what I shoukd be looking for? It seems odd (maybe it's not?)that a cable would "float" like this...


Comments

  • #2
    KoolKid
    Moderators, Home & Garden Moderators, Technology & Internet Moderators Posts: 24,789 Mod ✭✭✭✭KoolKid


    Its either a faulty sensor,contact or connection on that zone.
    Disconnect the zone from the expander & remove any end of line resistors,
    Set you meter to continuity and connect the pair to the 2 meter leads.

    Make a note of the reading in ohms. One by one tap every sensor & open and close every contact. After a tap or an open close the resistance should return to the around the same value. If it does not disconnect that device , close of the pair wired into it & move on. Replace any units that are faulty.


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