[SML] Opinions on Strand C21 dimmers?

[John McAfee]

I’ll second this.  I’ve managed two new PAC’s with C21’s.  The first building had no issues with them, but my current one I am battling regular unresponsiveness of single sine-wave units.  I partially attribute this to our generator tests causing power blinks, because after a generator test (Wednesday mornings, usually) one or two sine-wave modules will no longer turn on.  This is really problematic because they control our houselights.  If I pull the modules and swap them with another set (swapping them within the rack, not swapping with spares), it clears up for a while, but then in a few months a new dimmer module will become unresponsive.

In one of my other spaces, I’ve had to have a thermistor replaced two or three times. 

Standard and 6K’s seem to be reliable.


> On May 27, 2017, at 11:09 AM, Villem Teder via Stagecraft <stagecraft at theatrical.net> wrote:
> 
> A bit more details at COC.
> 
> Most of the failures at the COC Four Seasons Centre have been the sine wave
> modules. Many of the problems have been because of over heating. There was
> a flaw in how the over temp sensor was mounted/connected. A local 
> electronics consultant devised a work-around.
> 
> Apparrently, when a sine wave module goes back to Strand, it comes back
> as an IGBT type module. Looks like sine wave is no longer offered by Strand.
> 
> The sine wave modules were the most complex-looking of dimmers. In fact,
> when the FSC was being designed, the sine waves were dimmer per module.
> By the time they were installed in 2006, they had shrunk to the more
> familiar two dimmers per module.
> 
> 
> Villem Teder
> 
> Local 58
> Toronto
> 
>> edited
> 
> 
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