marine navigation light problems

Discussion in 'OnBoard Electronics & Controls' started by ellawendy, Apr 4, 2011.

  1. ellawendy
    Joined: Mar 2011
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    Location: Egypt

    ellawendy Junior Member

    i need to install 13 navigation light lamps 24 volts DC, 40 watt each, each lamp is connected to an on/off switch to light the lamp on or off but i want to activate an alarm if i moved the switch to the on position and the lamp didn't light on, am not good at electronics and tried to do it with relays several times

    thank you for your help
     
  2. ekamarine
    Joined: Nov 2008
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    Location: Turkey

    ekamarine Junior Member

    There are ready electronic cards for navigation lights in the market. The line between switch and navigation lights go through this card so if there is a problem with light, light bulb etc, you get an alarm on dashboard.
     
  3. ellawendy
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    ellawendy Junior Member

    i know that but i want to make these card it's cost is cheap but it's very expensive so i need it's design
     
  4. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    If you are not good at electronics, making your own circuit boards is a bad idea.
     
  5. ellawendy
    Joined: Mar 2011
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    ellawendy Junior Member

    i can make a board but am not good at design beside am trying to make it with relays
     
  6. gonzo
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    gonzo Senior Member

    That would be really expensive and much more unreliable.
     
  7. gonzo
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    gonzo Senior Member

    Can you use an indicator light or do you need an alarm?
     
  8. ellawendy
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    Location: Egypt

    ellawendy Junior Member

    i know it's expensive but it's much cheaper than buying the panel
    and i'll use indicator light but it's better to use alarm with the lamp
     
  9. Tim B
    Joined: Jan 2003
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    Location: Southern England

    Tim B Senior Member

    You need to measure the current flowing through each circuit. This is done by measuring the voltage drop over a small resistor and using ohms law. For your case, you can use a comparator for each channel, the output of which gets "OR"ed with all the other channels to drive an audible alarm. You could also put an LED on the output of each comparator.

    I would look for an electronics development firm in your area, they will have someone who can help. There is loads of info on this type of over/under current alarm on the web.

    Tim B.
     
  10. ellawendy
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    ellawendy Junior Member

    thank you Tim i'll take ur advice
     
  11. BertKu
    Joined: May 2009
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    Location: South Africa Little Brak River

    BertKu Senior Member

    If the globes are connected to the plus 24 Volt and you switches connect the globe to earth/mass, you could most likely do it with 13 x 1N4007, 26 x resistors of 47 KiliOhm, 14 x BC337-40 (NPN) and a 24 Volt Buzzer.

    If your switches are switching not to mass/earth but to + 24 Volt, you probably have to use BC327-40 (PNP)

    However you will know at any time whether a globe is packed up, and not just when you switch the globe on. If that is acceptable to you, all what you do is to use the globe as the low resistance of the globe in series with the high resistance. Should the globe be faulty, the transistor is not conducting and it will let the last 14th transistor jump to + 24 Volt (depends on how the switches are connected) , this in turn will hoot the hooter, the buzzer, let a light switch on or a Light emitting diode.
    Bert

    Cost, I may even put all of it in the post to you, if you have a Poste Restante address and a name. You have to make your own PCB, I want have the time at present.
     
    Last edited: Apr 7, 2011
  12. BertKu
    Joined: May 2009
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    Location: South Africa Little Brak River

    BertKu Senior Member

    You could even make it more fancy and use some 13 LED's, you will then know immediately which globe is not functioning. It means an extra 13 x LED's and 13 more resistors. All LED's are on, when the navigation lights are not faulty / all switches not making contact. When a LED is off, your switch is either on, or the Navigation light is packed up. Simple, inexpensive.
    Bert
     
  13. BertKu
    Joined: May 2009
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    Location: South Africa Little Brak River

    BertKu Senior Member

    If the accumulated current is bathering you, you could put a toggle switch to the plus line which connects all the led's and buzzer. i.e. If you use 16.000 / 20.000 mcd red or white LED's , each 10 mA = 130 mA, which may over 24 hours be a problem. In that case a toggle switch will reduce that consumption.

    Working:
    You switch the toggle switch on
    Your 24 Volt feeding line to the LED's has power
    All 13 LED's will be on, except the one, of which the 40 watt globe is packed up, loose or the 40 watt switch is in conducting position.
    Assuming all globes are O.K.
    the leakage current from the globe goes to the diode, in series with the 47 Kilo-Ohm, this in urn to the base of the BC 337-40.
    Between base and ground/mass/earth you have the second 47 KOhm resistor
    This resistor is needed to pull the base down, if the 40 watt globe is faulty
    The transistor conduct, your LED via the 4700 Ohm is burning
    After you have checked whether any of the 40 watt globes are packed up, you switch the toggle switch to off position and you save current.

    If you want over and above a buzzer, you connect 13 diodes 1N4007 to each
    BC 337-40 via a diode to a base resistor of 4700 Ohm The emitter will go to a 1 K Ohm resistor , which has an elco of 470 uF /25 Volt over the 1K resistor. The collector is connected to a 24 Volt buzzer and a special 22 Kilo Ohm resistor from emitter to 24 Volt (after the toggle switch)
    Why?, to lift the pre base voltage to +/- 1,5 Volt .

    But why should you do this??? You don't need a buzzer, except if the 40 watt globes are switched from a remote position.
    Bert
     
  14. BertKu
    Joined: May 2009
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    Location: South Africa Little Brak River

    BertKu Senior Member

    You could do it even simpler. With 13 LED's bright 16.000 - 20.000 mcd, 13 zenerdiodes and 13 resistors and a toggle switch. That is all you need

    Working:
    If the toggel switch is on (In this case connected as an earth/ground line to earth/ground all 13 LED's kathode is connected to this toggle switch.
    In series with each LED, you have a resistor of 2 Kilo Ohm and in serie a zenerdiode of 10 Volt ( 9.1 Volt, 12 Volt is also O.K.) each zenerdiode is connected to one of the 13 globes.

    Info: A white Led has a forward Voltage of 4 Volt.
    A red LED has approx 1,8 Volt Thus you may have to use a 2,2 Kilo Ohm resistor in that case.
    The zenerdiode has 5 mA x 10 Volt = 50 milliwatt power dissapation, use a 1 watt zener.
    The resistor is 5 x 5 x 2200 = 55 milliwatt , use a 1/4 watt resistor

    If a globe is faulty, or loose, or the 40 watt switch is on. The LED will be off.

    If the globe is good and the 40 watt switch is off, the leakage current through the globe and then via the zenerdiode/ resistor to the LED, will let the LED burn, while the current for the 40 watt glob is too low to make an impact on the 40 watt globe.

    If you can't get 10 Volt zener diode, use a lower value, but increase the value of the resistor from 2,2 Kilo Ohm to 3,3 Kilo Ohm

    You probably could do it without zenerdiodes, just diodes 1N4007 or even maybe without both.
    The zenerdiodes and diodes are needed to avoid a problem when the toggle switch is open.
    Bert
     

  15. BertKu
    Joined: May 2009
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    Location: South Africa Little Brak River

    BertKu Senior Member

    I have 15 diodes 1 N4007 (new) , 15 resistors 4700 Ohm ( new) , 15 bright 10 millimeter 6000 mcd red LED's (new), o,5 meter black shrink sleeve and a used toggle switch awaiting for you. My contribution to your country after the economic collapse. Times must be hard for you.

    Give me a PM with your closest post office, which can handle poste restante and a name, I will post it to you with compliments free of charge.
    Bert

    P.S. In the afternoon I have made a circuit and tested it out. It works like a dream, inexpensive, very reliable and quick to make.
     
    Last edited: Apr 8, 2011
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