LEM's Sentinel 3+ is a battery-monitoring transducer that measures
the voltage, temperature and impedance of cells and complete batteries in
uninterruptible power supply (UPS) installations of all sizes up to mega-watt
back-up power supplies for data centers and hospitals. Sentinel 3+ reports its
measurements - on valve-regulated lead-acid (VRLA), gel or flooded stationary
batteries - to supervisory systems over a dedicated communications bus, and
offers a unique capability to assess the true state-of-health of UPS batteries
while they are in service. Sentinel 3+ gives complete confidence that battery
arrays will deliver their rated power when called on to do so, and identifies
weak and failing cells without the need to remove them from service for cycling
Technology developments such
as the availability of fast insulated-gate bipolar transistors (IGBTs) reduce
costs by eliminating transformers from their circuit configurations. The
battery packs that the Sentinel product monitors are operated in a floating
voltage mode: the battery is subjected to higher ripple currents, and the
monitoring circuitry must handle high common-mode voltages, with superimposed
high-amplitude, fast transients.
LEM's Sentinel 3+ has upgraded
algorithms to address more challenging measurement environments and improved EMC
immunity and enhanced robustness. Sentinel 3+ delivers voltage measurements
over a range of 0.9 to 16 V with an accuracy of +/-0.5 percent; impedance
measurement from 0.05 to 250 mO with repeatability of +/-2 percent.
Sentinel 3+ features Common Mode Transient Immunity up to 20 kV/µsec with a
common-mode voltage level of +/-600 V, and a transient repetition rate of 20
What makes this movie stand out from the typical high school sports story is that the teenagers are undocumented immigrants, and the big game is a NASA-sponsored marine robotics competition. Like many other Hollywood movies, however, Spare Parts only tells part of the story. What the film shows -- and doesn’t show -- raises important issues affecting STEM education in the US.
Instead of sifting through huge amounts of technical data looking for answers to assembly problems, engineers can now benefit from 3M's new initiative -- 3M Assembly Solutions. The company has organized its wealth of adhesive and tape solutions into six typical application areas, making it easier to find the best products to solve their real-world assembly and bonding problems.
Load dump occurs when a discharged battery is disconnected while the alternator is generating current and other loads remain on the alternator circuit. If left alone, the electrical spikes and transients will be transmitted along the power line, leading to malfunctions in individual electronics/sensors or permanent damage to the vehicle’s electronic system. Bottom line: An uncontrolled load dump threatens the overall safety and reliability of the vehicle.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.