LBCSeattle
Member
My theatre has Entertainment Technology Intelligent Power System IGBT dimmers that are now about 11 years old. We are having failures that appear to be heat related on dimmers that are nowhere near capacity. For example, a single 2.4kw module with 1 575w fixture on each circuit running at 75%, will suddenly shut off after being on for 15 or 20 minutes. They will work again later in the same show. In some instances rather than failure the dimmer will "blink" occasionally. These problems are becoming quite pervasive. I would certainly not classify the system as heavily used, just average, steady academic use, and rarely are the dimmers loaded to anywhere near full capacity.
Anyone else out there have this experience? What is our best approach to dealing with this (short of replacing the system)?
I have to wait for an opportunity to do more scientific testing, but based on prior tests we found several modules failing with loads over 2.1k, so for the last year we have de-rated them to 2k, but now the issue seems to be worsening.
Anyone else out there have this experience? What is our best approach to dealing with this (short of replacing the system)?
I have to wait for an opportunity to do more scientific testing, but based on prior tests we found several modules failing with loads over 2.1k, so for the last year we have de-rated them to 2k, but now the issue seems to be worsening.