Problems with safety relay

Discussion in 'Power Electronics' started by Jonplynch, Nov 16, 2017.

  1. Jonplynch

    Thread Starter Active Member

    Jan 28, 2012
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    Hi guys

    I am having trouble with a safety relay that is giving me a red error light of some kind that i cannot see why. This relay is controlling two door sensors. The lid sensor when lifted gives an error light as it should and then clears when it is closed again. The front door sensor however is not giving an error light when opening but i have taken it off and bench tested it and it is working fine. I just dont know if the relay itself may be giving trouble as it is only controlling these 2 sensors and is being powered by another safety real which is controlling the estops and that too is fine. I have attached info and pics of relay i am using along with sensors and schematic. The error i am getting is on the light beside terminal 24 even though nothing is connected to it.

    Terminals 1 and 2 are power and terminal 3 is connected to a NO side of a 3 phase circuit breaker. Terminals 1 and 4 are also linked

    link is relay in use

    http://www.elobau.com/en/machine-safety/safety-control-units-/-safety-relays/safety-relay-46212.e1.
     
  2. AlbertHall

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  3. Jonplynch

    Thread Starter Active Member

    Jan 28, 2012
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  4. MaxHeadRoom

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  5. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    There are english texts in these PDF's from the site.

    Bertus
     
  6. Jonplynch

    Thread Starter Active Member

    Jan 28, 2012
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    Thanks for the manual guys but I'm still uncertain of the error light beside terminal 24. Before I left it for today i measured 24 volts dc between terminals 6+7 8+9 10+11 but nothing between 12 and 13
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Isn't that a contact closure sensor source?, what are the devices hooked up to the inputs? Appears that one may be missing.
    Max.
     
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  8. Jonplynch

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    Jan 28, 2012
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  9. MaxHeadRoom

    Expert

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    Doesn't that mean you have non-operating/open sensor? They appear to be non contacting magnetically detected.
    Max.
     
  10. bertus

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    Apr 5, 2008
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    Hello,

    Would this be the documentation for the GD switches?

    Bertus
     
  11. Jonplynch

    Thread Starter Active Member

    Jan 28, 2012
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    I only have two sensors the top one is working but I am not getting 24vdc at the terminals 12 and 13 on the relay which the 4 wire sensor runs back to
     
  12. MaxHeadRoom

    Expert

    Jul 18, 2013
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    That was my previous point, it appears either your sensor sw is not being detected or could be faulty, if they output contact closure and not a safety sequence switch, you may be able to jumper/simulate it?
    Looking again at the spec sheet, it looks like they are sequence operated.
    Max.
     
  13. Jonplynch

    Thread Starter Active Member

    Jan 28, 2012
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    Thanks max i took the sensor off which I suspected to be not working but it checks out on bench testing. Ifci out it back online and give a 24v supply to terminal 12 this will simulate a closed/healthy switch?
     
  14. MaxHeadRoom

    Expert

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    They show them as N.C. so not sure of the operated status?, but usually the importent thing with these safety switches is the sequence between contact(s) has to correct, IOW it is usually not possible to simulate them easily.
    How did you test it? with the correct operator?
    Max.
     
  15. Jonplynch

    Thread Starter Active Member

    Jan 28, 2012
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    I hooked them up to lamps so when power up on the NC the lamp on and then when actuator present on NO lamp on too
     
  16. MaxHeadRoom

    Expert

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    Not sure I understand the test, can you simulate the sensor input to the safety relay, IOW bypass the door sensor?
    Using SPDT SW.
    Max.
     
  17. Jonplynch

    Thread Starter Active Member

    Jan 28, 2012
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    Hi max

    When I open the top lid sensor a red error light appears on the safety relay and when I close it it goes off . When I open the front door another red light comes on and when I close it it goes off BUT the sensor has two contacts one NC and one NO but when I meter out the bottom two contacts 12 and 13 which I should be getting 24vdc but I am not. I am not getting the - between 12 and 13 but I do get the 24v when I measure between 11 and 12 I get 24
     
  18. Jonplynch

    Thread Starter Active Member

    Jan 28, 2012
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    So I am assuming because I am not getting the 24 between 12 and 13 that my safety circuit isn't complete?
     
  19. Jonplynch

    Thread Starter Active Member

    Jan 28, 2012
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    I have attached photos of the safety circuit and then the start/stop circuit I just can't figure out where in the schematic that the safety sensors are tied into the start or run circuit IOW where or what is holding it off from starting
     
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