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    JeffOBS
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SP24 Rack, Dim 1-8 Work Fine, 9-24 Jump to 60% when set to 5%

Hi all, i've got an old-ish Sensor 24 dimmer portable rack (Model SP-2420BV).  Used to work fine, but a couple months ago it went to a gig at a convention center, and while running the show i noticed that most of the dimmers would jump to 60% as soon as i gave them any signal, then fade up (relatively) normally from there to 100%.  Lots of testing afterwards, and its the dimmer rack for sure.  Here is what i've done:

Swapped Modules, but the same dimmers act up, the problem doesnt follow the modules.

Swapped CEM (CEM Classic version 3 something i believe), no change.

Opened it up and ripped it apart:  Nothing looks wrong, no burned components or anything, and properly set for 3-phase.

I've gone into the CEM and done the restore factory defaults bit, but no change there.

So, anyone have any idea's what is going on?  The system at one point may have been hooked up to a 3-phase power source while configured for a single phase power source, but i dont see anything burned out, and im not sure where else something COULD be burned out...

I did call emergency tech support about this when it happened, but obviously never managed to fix it.

On a side note, how i've been testing it is setting all the dimmers to 5% from the CEM brain and plugging in a lamp to each SPG connector.

Anyone know where i can get a wiring schematic so i can check actually component meter values against what they should be?

Thanks for the help.

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  • That is almost certainly a misconfiguration.

    If the CEM is configured to think that it's in a different kind of rack than it actually is, then a lot of circuits will misbehave as they are being 'fired' at the wrong moment in the mains sinewave.

    The number in the rack type name refers to the number of module slots, not the number of circuits.

    If you have 24 circuits using D20 modules, the rack is either an SP12 (portable) or an SR12 (installation). If you configure it as something else, it won't work correctly.

  • in reply to Richard

    Thanks for all the responses...from what i remember, if i chose rack type SP12 then i would only get 12 dimmers (trying to set a level for dimmer 13 would show the message "NOT A DIMMER" or something similar), however if i chose SP24 then i would get 48 dimmers, so i stuck with SP24.  I'll check again but i'm almost certain this was the case...

  • in reply to JeffOBS

    Ok turns out im an idiot...yes, it should be SP12, im not sure where i got the information from my last post...as a side note, this is the exact opposite from what ETC Emergency help told me....fantastic.  Thanks for all the help.

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