... | ... | @@ -12,12 +12,12 @@ heating problems and proposes solutions to mitigate them: |
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## Solutions
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For those who don't like reading the rest of this page:
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For those who don't want to read the rest of this page:
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- Elma 3U crates: increase fan speed to maximum, avoid slot 6.
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- Elma 1U and 6U crates: increase fan speed to maximum.
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- Wiener crates: increase fan speed to medium/maximum.
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- Kontron PCs (other PCs as well): install a fan.
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- PCs (SPEC + FMC Delay): install a fan.
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## Detailed temperature measurements on different platforms
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... | ... | @@ -760,6 +760,22 @@ below): |
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Exhaust fan (pumping the air outside the FMC area) proved the most
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effective, keeping all FMC temperatures below 65 degrees C.
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## Capacitor temperature
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Electrolytic capacitors lifetime is the most important failure factor
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caused by high operating temperature. We measured the temperatures of
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the capacitors:
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- using a thermal vision camera
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- by gluing the DS18B22 sensor directly over the hottest capacitors.
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We found out that the worst capacitor temperature was around 75 degrees
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C, while the board's temperature was 89 degrees C, that is, 14 degrees C
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of difference. \*For the temperature (as measured by the normally placed
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onboard sensor) of 65 degrees C, it means the capacitors are never
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hotter
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than approx. 51 degrees C. \*
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## Conclusions
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*What to do:**
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... | ... | @@ -768,8 +784,7 @@ effective, keeping all FMC temperatures below 65 degrees C. |
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- **Elma crates**. Set air flow to maximum level. Do not use slot 6 on
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Elma 3U crate.
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- **Wiener crates**. Set air flow to medium/maximum level.
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- **Kontron PCs must be equipped with additional fan units**, to be
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designed.
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- **Kontron PCs must be equipped with additional fan units**.
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*Notes/observations:**
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... | ... | @@ -794,7 +809,7 @@ effective, keeping all FMC temperatures below 65 degrees C. |
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... +85).
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\---
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15 August 2014
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29 August 2014
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