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Low Voltage power supplies

Discussion in 'Power Supplies' started by cscool36, Dec 6, 2011.

  1. cscool36

    cscool36 Full Time Elf

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    Hi All,
    This year I am running 24vdc and 12vdc power supplies.
    So I Need some advise on.


    1. Do I leave them running with 240vac switch on.
    2. Use a timer and turn on before the show and turn off after the show.
    3. I can use my 240vac channel and turn on through vixen.


    What are you doing?.


    Hoping someone can help.


    Thanks
    Colin
     
  2. fasteddy

    fasteddy I have C.L.A.P Global Moderator Generous Elf

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    you can do it many ways except using the controller to switch it on, it all depends if you want it automated with a timer or not. Personally i turn everything off manually
     
  3. David_AVD

    David_AVD Bite my shiny metal ass!

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    Don't switch your power supplies on/off via a 240V controller channel, especially if they are switchmode power supplies. You really want to switch it with a timer or relay.

    On a slight tangent....

    I was only thinking last night about a single channel DMX relay that could switch mains to my switchmode power supplies. In my case I have a DR4 in each location, so would need to leave that powered up all the time so the DMX relay board could get it's signal.

    The other thing I'd do is make the output stay on for a while (5 minutes?) after the DMX channel drops to zero so it doesn't drop out between sequences.

    Alternatively, the power relay board could just sense a valid DMX stream to know when to power up. The only issue with that is if you're using a DMX source that sends out DMX with no input (such as a DR4 with "keep-alive" enabled), it would never shut off.
     
  4. OP
    OP
    cscool36

    cscool36 Full Time Elf

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    Thanks for your help and Ideas.


    At this stage I am using 1 240 volt channel to turn on a small transformer to 24vac than through a bridge rectifier for 24vdc, Then using it for a 24vdc contact relay to control the 240 volts to the power supplies. I have also added some capacitors to hold the coil on the contact between sequences.
    I am using vixen. Is there a code that I can use to turn on this cannel for longer then the sequence?.


    Thanks


    Colin
     
  5. AAH

    AAH I love blinky lights :) Community Project Designer

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    Definitely a good call not running the power supplies off a 240V channel. The inrush current with switchmodes is often in the 20A or more range. A switch or a relay can handle this momentary current spike but semis don't like that sort of monster overload.
     
  6. kane

    kane Dedicated Elf

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    I use timers to switch mine on 15 minutes before the show, and off again 15 minutes after the show.
     
  7. JPB

    JPB Full Time Elf

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    So do I
     
  8. Bevo

    Bevo Let your Light Shine before men

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    I am just leaving mine on 24/7 at the moment. I did not think there would be a problem with this.

    I am unaware of any dangers this would cause, as my switchboards at work contain 24VAC transformers and run 24/7 everyday of the year. I thought the more times you turn a power supply on and off everyday could have more of a damaging effect than leaving it on all the time.

    Are DC power supplies different to AC transformers and should they not be left on?

    Or are people only switching them off to save power?
     
  9. David_AVD

    David_AVD Bite my shiny metal ass!

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    I would be wary of leaving the "no-name" switch mode supplies on and unattended 24/7.
     
  10. fasteddy

    fasteddy I have C.L.A.P Global Moderator Generous Elf

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    We have seen the quality first hand of the cheap Chinese power supplies at the Brisbane mini when David let out the smoke of a Steves power supply when he plugged it in and it went bang.
     
  11. SmartAlecLights

    SmartAlecLights Im a SmartAlec what can i say! Community Project Designer

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    Same here, the transformers switch on 15min before an 15min after the show.
    I leave the dr4 on 24/7 tho.
     

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