These Ads will no longer appear once you have logged into ControlBooth.

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Control/Dimming DMX splitter?!?!?

Discussion in 'Lighting and Electrics' started by ChaoticMoth, Nov 15, 2013.

  1. ChaoticMoth

    ChaoticMoth New Member

    Messages:
    9
    Likes Received:
    0
    Location:
    South Wales, UK
    I run a Strand LBX, and for our next production have hired a DMX splitter from a local theatrical hire company. Everything has gone pretty straight forward apart from one slight problem. Our generic floods seem to be surging quite a lot at low levels. Have checked all the connections and cables but can't seem to find any obvious problems :S
    Any suggestions?
  2. SteveB

    SteveB Well-Known Member

    Messages:
    2,860
    Likes Received:
    354
    Location:
    Brooklyn, NY
    Some additional info. needed..

    The floods are incandescent lamp units connected to dimmers ?, LED's that are connected via the added opto ?


    Sent from my iPad using Tapatalk
  3. techieman33

    techieman33 Well-Known Member

    Messages:
    1,707
    Likes Received:
    180
    Location:
    topeka, ks
    Does the surging still occur when the opto is removed from the chain?
  4. ChaoticMoth

    ChaoticMoth New Member

    Messages:
    9
    Likes Received:
    0
    Location:
    South Wales, UK
    The LEDs are 4 Par 64s and a Par 56. If we unplug the splitter and just run the board straight to the simmer pack then no surging occurs. I've checked all the connections and cables but still no luck.
  5. derekleffew

    derekleffew Senior Team Senior Team Premium Member

    Messages:
    4,869
    Likes Received:
    1,991
    Location:
    Las Vegas, NV, USA
    Have you tried all the outputs on the opto-splitter? Replaced the cable from opto to dimmer rack? Does it happen with ALL dimmers or just the ones with the floods on them? What make and model is the splitter?
  6. SteveB

    SteveB Well-Known Member

    Messages:
    2,860
    Likes Received:
    354
    Location:
    Brooklyn, NY
    Are
    Still a bit unclear as to what gear is having trouble.

    I assume the LED PAR64 and 56 units are the floods ?. If so, you have their DMX cabling coming out of the opto-splitter and that's when you have surging ?.

    Some thoughts:
    - Have you tried a DMX terminator on the last LED in a daisy string ?.
    - If the fixtures use 3 pin data connectors are you using microphone cable ?. If so, you could be having signal issues related to the wrong cable type. If Mic. cable, you would need to get real DMX data cable and possibly 3 to 5 data turn-around adapters (if the fixtures don't have 5 pin DMX connectors on-board).
    - How are the LED's powered ? Hopefully on a direct power source (direct to circuit breakers in a panel, or relays or constant modules in the dimmer rack) and not out of a circuit with a dimmer parked at full. That too can cause issues.
    Whitestx likes this.

Share This Page