Relay Teaser Question

Discussion in 'General Electronics Chat' started by saint_jay77, Aug 23, 2007.

  1. saint_jay77

    Thread Starter Member

    Oct 19, 2006
    26
    0
    SIMPLE SOLUTION REQUIRED

    Hi,
    I have to find a way to check to make sure the 2 relays in the circuit which are connected in series work switch. I do not want to use any other source of power but 48V.
    Is there a way using hardware the circuit can be tested.
    Failure modes to consider are typically the relays getting stuck on contacts and not switching off. Meaning relays are stuck to the pole.
    Is there a way to detect this???
     
  2. nanovate

    Distinguished Member

    May 7, 2007
    665
    1
    Can you post a schematic? You might be able to use an optocoupler to feedback a signal to the control electronics.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    If the contacts conduct current when active, then looking for continued current when the relay is supposed to be inactive will let you see if the contacts actually open up. You can also check for voltage across the contacts. If the voltage is zero, then the contacts are stuck.
     
  4. techroomt

    Senior Member

    May 19, 2004
    198
    1
    you may want to look at something called force guided relays.
     
  5. nanovate

    Distinguished Member

    May 7, 2007
    665
    1
    Do you need to check this from the "coil" side or can you check it from the contact side? In other owrds do you need to maintain isolation?
     
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