High school project help

Discussion in 'The Projects Forum' started by mfishbein, Dec 31, 2010.

  1. mfishbein

    Thread Starter New Member

    Dec 31, 2010
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    I wish to use a 12vdc lead battery to drive a 12vdc miniature push solenoid.

    Here are specifications of solenoid.
    Ledex™ 12VDC tubular solenoid pushes a 1" long plunger pin. Size of solenoid about 1" long x 0.5"Dia. Has 3/8" threaded bushing for panel mounting. Our tests indicate the pin can push out about 0.4". Has 1" long insulated leads with mounting nut.
    Coil resistance is 48 ohms and it requires about 250mA to operate.

    The battery is 12vdc with 5Ah.

    My first attempt at direct wiring produced no movement of plunger.

    Please help with detailed advice. The project is due shortly.

    Thanks.
     
  2. CDRIVE

    Senior Member

    Jul 1, 2008
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    Uh... dead battery or defective solenoid comes to mind. Did you check the coil for continuity (48 Ohms) and the battery for 12V?
     
  3. hgmjr

    Moderator

    Jan 28, 2005
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    Can you provide the part number for the solenoid so that we can access the datasheet for the beast?

    hgmjr
     
  4. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
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    Something as simple as a battery to a solenoid is hard to mess up. I assume you have or have access to a multimeter? Check your battery voltage and verify continuity of the solenoid and your wiring.

    When you energize the solenoid the battery voltage should remain almost perfectly the same considering the specs you gave us.
     
  5. mfishbein

    Thread Starter New Member

    Dec 31, 2010
    5
    0
    Ledex™ 12VDC tubular solenoid
    Coil resistance is 48 ohms and it requires about 250mA to operate.
    G16333

    The battery is new and I tried four different solenoids with same result.
    The battery is 12 volts and 5amh.

    Is it possible that I need a different battery?
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Can you give us the diagram of the connections you make? Do you have a meter to confirm the continuity of the wiring and the solenoid coil?
     
  7. mfishbein

    Thread Starter New Member

    Dec 31, 2010
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    I have not set up the complete wiring yet. I am just hooking the solenoid directly to battery with each wire from the solenoid hooked up to a different pole of the battery to denote response (or lack thereof). I don't have a meter in my home.
     
  8. hgmjr

    Moderator

    Jan 28, 2005
    9,030
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    I can't seem to correlate the part number you have given with any of the relays in the Ledex product line. Is it possible that this is not the part number but rather a serial number or UL registery number?

    hgmjr
     
  9. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,696
    904
    Very odd problem may have very simple answer. Can you post a picture of the actual battery you are using? If possible, have the solenoid connected.

    John
     
  10. wayneh

    Expert

    Sep 9, 2010
    12,127
    3,048
    Do you have any other 12v devices handy, eg. auto light bulbs, garden tractor light bulb, auto accessory meant to plug into cigarette lighter, etc.? Try making same connections as your solenoid.
     
  11. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
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    Just a guess but is the solenoid plunger spring loaded? If it isn't then reverse whatever position the plunger was in when you tested it and test again. You may be expecting it to push out when it's supposed to pull in, or visa versa....

    Edit: Come to think of it, and I could be very wrong, but, without checking to verify this, I think they're all pull_in when energized. CYA!
     
    Last edited: Jan 1, 2011
  12. mfishbein

    Thread Starter New Member

    Dec 31, 2010
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  13. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    From the specsheet you can see solinoid is 27 Volts in stead of the claimed 12 Volts:

    [​IMG]

    You will propably have to use a higher voltage to activate it.

    Bertus
     
  14. mfishbein

    Thread Starter New Member

    Dec 31, 2010
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    OK. I brought solenoid to radio shack and tried several different voltages (up to 30) without any success. At the higher voltage, I felt solenoid heating up.

    This is very frustrating.

    I'm not sure what to do next.
     
  15. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
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    This is a mute point.., but instead of posting a statement like that, post the link so we don't have to go digging. Your first post stated that it was a 12V@5AH battery. 5mAH is a far different animal.
     
  16. CDRIVE

    Senior Member

    Jul 1, 2008
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    While you were there you should have used one of their DMMs to measure the resistance of the coil.
     
  17. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    Not entirely his fault. Check THIS out..
     
  18. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
    1,393
    If the plunger is free floating, that means it does not withdraw after being pushed out. Is it possible that the plunger is already pushed out? If so, the solenoid would get hot under continuous power. Try pushing the plunger back in and then applying a short pulse of dc. With no mechanical resistance, it wouldn't surprise me if 12vdc would operate it.
     
  19. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
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    I suggested same earlier but he didn't reply.
     
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