Relay Switch Suggestion

Discussion in 'General Electronics Chat' started by ghan7213, Aug 3, 2016.

  1. ghan7213

    Thread Starter New Member

    Aug 3, 2016
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    Hello;

    I have a question and your help would mean alot to me.

    I want to install an x-ray indicator lamp that would use a relay switch. I have attached the schematics diagram of the circuit.
    As you can see that pin 3 and 4 of the x-ray unit along with the 24 V DC input signal goes to the relay input , I assume the common and the indicator lamp is attached at the output end.

    I don't know what kind of relay switch I should use it. Can you suggest any switch and the input/output port connections.

    Thank you for your time

    Ghani
     
  2. ghan7213

    Thread Starter New Member

    Aug 3, 2016
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  3. AnalogKid

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    If the relay coil is rated for 24 V and draws 0.1 A DC, then any switch rated for at least 0.2 A DC should work. Size, shape, pushbutton, toggle, waterproof, whatever - that's al up to you and the environment the switch will be in.

    Similar rules apply to the relay contacts. They must be rated for the lamp voltage and should be rated for at least twice the lamp current.

    What are your circuit wiring skills? If low, then you can get an industrial relay that has wiring or screw terminals in stead of printed circuit board pins. If this is going to get a lot of use, consider a solid state relay; an SSR has no physical contacts that can wear out over time.

    What does the "*2" on the drawing indicate?

    ak
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    24vdc relay is very common, but the required contact rating is needed what is the nature of the lamp supply and the indicator lamp itself?
    Or is every thing 'prepared by the user'?
    Max.
     
  5. ghan7213

    Thread Starter New Member

    Aug 3, 2016
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    Thank you very much for your reply. This circuit was provided by the vendor of the x-ray tube. We bought a lamp that draws current less than 0.1A. Here is the link to the lamp

    http://www.walkerindustrial.com/IDEC-Components-p/ld6a-1dqb-r.htm

    Can you suggest a relay that we should use. It has to be a 6 pin relay switch, I think. 2 pins for the DC power supply, 2 pins for the x-ray signal pins and two for the lamp indicator. Am I right?
    We would prefer industrial relay switch.
     
  6. ghan7213

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    Aug 3, 2016
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    The lamp has a ratings of 24V DC, 25mA and 0.6 W.
     
  7. MaxHeadRoom

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  8. KeepItSimpleStupid

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  9. #12

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    Nov 30, 2010
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    I don't think so.

    I'm on my Linux computer and don't know how to do drawings, so I'll try this in words.

    Find a 24 volt DC supply and its ground, or, "common" point.
    Connect 24 volts DC to the relay coil.
    Connect the other end of the relay coil to pin 3 of the "x-ray on" device.
    Connect pin 4 of the x-ray on device to ground.

    Connect 24 volts to one connector on the lamp.
    Connect the other connector of the lamp to a normally open contact on the relay.
    Connect the wiper of the relay to ground.

    That uses a 4 pin relay.
    I am assuming the x-ray "on" connection is just a switch.
    If I assumed wrong, don't follow my instructions.
     
  10. AnalogKid

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    The pin 3 and pin 4 x-ray signal outputs probably are internal relay contacts. If you can find out their ratings, they might be able to drive your lamp directly.

    ak
     
  11. ghan7213

    Thread Starter New Member

    Aug 3, 2016
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    Awesome, someone suggested me to use a 5 pin relay. Do you think, 5 pin relay might also work
     
  12. #12

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    Certainly!:) So will a 6 pin relay and an 8 pin relay, and a 16 pin relay...because you will not use the extra pins.
     
  13. inwo

    Well-Known Member

    Nov 7, 2013
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    As pin 3 and 4 have polarity specified, most likely open collector output.
    There are specific relays packaged with the 24vdc supply, specific to that application.
    I'll try to find a link.
    Have one in front of me to take a picture.
     
  14. inwo

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    Nov 7, 2013
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  15. inwo

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    An aside to #12 for HVAC.

    I use these with great success equipping baseboard electric heaters to low voltage thermostats.
    Electric heat thermostats, are often inaccurate and troublesome.
     
  16. #12

    Expert

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    I know. That's why I made my own out of an LM723 and a 10K thermistor. About 1979, I think. That was a long time before I learned about SSR's, so I just used a triac. See my blog if you care to see how I did it.
     
  17. KeepItSimpleStupid

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    Mar 4, 2014
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    We have one electric baseboard heater on the porch. Ergonomic -- No. nothing fancy, but used the standard turn/twist/break knob and put a real switch ahead of it. Now, on/off and set and you generally don't have to hop up and down to find the right temperature.
     
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