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May 24, 2009 · The main heat-sink inside was almost too hot to touch and the fan turns on for volume settings between 20-0. So I figured it was the Center speaker overloading it. To make sure I hooked it up as well (3 speakers hooked up now).
- Motors
- Three-Phase Imbalance
- Connections and Wiring
- Fuses
- Motor Control Centers
- Transformers
Start by building heat profiles of your motors—these are simply high-quality thermal images of the motor running under normal operating conditions. This gives you a baseline of temperature measurements you can use later if/when the equipment has issues. The thermal images should include all the critical components such as the motor, shaft coupling,...
Capture thermal images of all electrical panels and other high-load connection points such as drives, disconnects, controls, and so on. Wherever you discover higher temperatures, follow that circuit, and examine associated branches and loads. Compare all three phases side by side and check for temperature differences. A cooler-than-normal circuit o...
Look for connections that have higher temperatures than other similar connections under similar loads. That could indicate a loose, over-tightened, or corroded connection with increased resistance. Connection-related hot spots usually, but not always, appear warmest at the spot of resistance, cooling with distance from that spot. In some cases, a c...
If a fuse shows up hot on a thermal scan, it may be at or near its current capacity. However, not all problems are hot. A blown fuse, for example, would produce a cooler-than-normal temperature.
To evaluate an MCC under load, open each component and compare the relative temperatures of key components: bus bars, controllers, starters, contactors, relays, fuses, breakers, disconnects, feeders, and transformers. Incorporate the guidelines previously provided in this article for inspecting connections and fuses and identifying phase imbalance....
For oil-filled transformers, use a thermal imager to look at high- and low-voltage external bushing connections, cooling tubes, and cooling fans and pumps, as well as the surfaces of critical transformers. (Dry transformers have coil temperatures so much higher than ambient, it’s difficult to detect problems with thermal imagery.) Incorporate the g...
Jan 13, 2019 · High Speed Video Makes Display Refresh Behaviour Easy To Understand. Blur Busters released the high speed video of motion blur reduction in year 2012, and we were the world’s first website to measure the input lag of G-SYNC via high speed camera in 2014.
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