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Trying to find a comparable relay

Discussion in 'Datasheets, Manuals and Component Identification' started by Ford Johnson, Feb 9, 2016.

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  1. Ford Johnson

    Ford Johnson

    4
    0
    Feb 9, 2016
    Hi, I'm trying to find a relay in America IMG_5810.JPG that is comparable to one that is "sticking" in my hydraulic cutter.
    We know very little about this kind of thing and unfortunately neither does our repairman.
    Apparently it's of German origin and I've been told that we would have to order the exact relay from overseas. ($450-$800)
    The description on the relay is as follows:

    KACO
    KOZ-RAS-2760
    RAS 24 220 S701/S724 P
    DC 24 V
    AC 6A 230/240V

    Any help would be greatly appreciated.
     
  2. Minder

    Minder

    3,006
    640
    Apr 24, 2015
    Unfortunately it looks like a custom rack for the relays making it difficult to sub, there are many N.A. relays that will do the job, in a pinch if you are sure the relay is the problem, I would tend to cannibalize the suspect relay and leave just the base with the plug in blades, from there I would wire new conductors out to a separate common relay.
    I am assuming there is nothing really special about these relays, such as latching etc, an examination with the plastic cover off would show.
    Does it show anything special on the schematic if you have it?
    M.
     
  3. Ford Johnson

    Ford Johnson

    4
    0
    Feb 9, 2016
    Thanks. The relay is the 2nd from left (the one with the burn marks). It controls the cutter's safety light curtain. It is after 15 years, now permanently stuck, preventing the light beam from working, which prevents cutting. Unfortunately, no one in our industry has had this problem.
     
  4. Minder

    Minder

    3,006
    640
    Apr 24, 2015
    It may be also best to check the nature of the load, if the problem is not a common one, something it is controlling is the problem?
    M.
     
  5. Minder

    Minder

    3,006
    640
    Apr 24, 2015
    As an interim measure You could take the cover off and free the contacts and polish them up with 600 g paper.
    M.
     
  6. Ford Johnson

    Ford Johnson

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    0
    Feb 9, 2016
    Thanks, I will try that. Someone else recommended that but I wasnt sure if it was a good idea or not.
     
  7. Tha fios agaibh

    Tha fios agaibh

    2,106
    708
    Aug 11, 2014
    Minder brings up some good points.
    From my experience, these pin type relays are garbage and don't stand up well. Particularly with inductive loads.
    I would retrofit that board with larger and more robust relays. It will save you head aches in the future. You can add din rail sockets to make future relay replacement a snap. That said these relays should work with what you have now.

    http://ab.rockwellautomation.com/relays-and-timers/pcb-pin-style-safety-control-relays
     
  8. Tha fios agaibh

    Tha fios agaibh

    2,106
    708
    Aug 11, 2014
    Not a bad idea to investigate wither suppression is warranted.
    Eg. Add a Varistor across AC load if it's inductive.
     
  9. Ford Johnson

    Ford Johnson

    4
    0
    Feb 9, 2016
    Thanks for all the help!
     
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