As one of only a few true manufacturers of Medium Voltage Solid State Starters in the world, Motortronics products can be recognized under name brands of several key players in the electrical industry.
MOTOR WINDING HEATERS FULL
In addition to having a complete line of solid state soft starters, Motortronics also manufactures electronic brakes, motor winding heaters, motor protection relays and offers a full line of AC variable frequency drives and accessories. Low voltage controls range from 200 to 600VAC 3 2000HP (up to 1500kW) and medium voltage soft starters range from 2300V to 15kV 200 15000HP (up to 12,000kW). Motortronics manufactures one of the broadest ranges of product available on the market today. Sales and engineering offices have also been established in China and South Korea to service the explosive growth potential in Asia and in other select growth market areas in South America and Europe. Kitts in the Caribbean through Motortronics affiliate company, JARO. Since then, additional manufacturing operations have been established on the island of St. The company's sales, engineering and production headquarters have been located in Clearwater, Florida since the company was founded in 1983. I’m sure some of the VFD manufactures have addressed this problem as they are a little more of a high dollar item.Motortronics is a worldwide-leader specializing in the manufacturing of solid state AC motor controls and motor protection products. Sure you can play around with the dip switches and find a setting that will work, but what happens at 4pm when the utility increases Kvar, or when the 300hp DC motor ¾ mile down the line set turns off.
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This is what the “Cost effective” heaterless contactors do not do. Which minimally should be 120 /cycle if you want to monitor “True Power” The optimum phrase would be “Waveform Sampling Rate”.
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Divide the sum by the time period the points came from. This would be hundreds or thousands of points typically. Add deviations due to power factor and harmonic distortion and the simple metering circuits become quite useless rather quicklyįigure the instantaneous power (voltage times current) at a bunch of regularly spaced points. The power at any instant in time is the voltage times the current at that instant. We need to consider the voltage and current waveforms point by point. There's a simple law of electronics called Ohm's law that tells us the impedance is the voltage divided by the current. Standard overload protection functions include phase loss and unbalance protection, selectable trip class, automatic/manual reset and ground current protection Metering is a bonus feature on some of them, but has little or nothing to do with the accuracy of the OL protection algorithm.Īdvantage starters eliminate the need for costly heater elements and their associated installation expense. Maybe not 20 years ago, but certainly now. The issue of accuracy, repeatability and reliability is far far better with SSOLs.
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I would also say that the more expensive the motor, the MORE I would insist on a solid state programmable OL relay. Almost all VFDs now have built-in overload protection anyway so it's only an issue if you have multiple motors downstream from a single VFD. Once solid again, the ratchet can be reset.Īs to comment from JoeFin on solid state overloads, some cheap ones are indeed not going to be very useful on the output of VFDs, but some are fine you just need to ask. It takes a specific amount of time so as to allow the motor to cool off after being overloaded.
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After a while the solder will re-solidify.
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When the solder gets to a specific temperature, it liquefies and the pawl is allowed to turn free against the spring pressure, releasing the trip mechanism so that the contacts open up and drop out the contactor coil. The pawl is holding back a ratcheting spring loaded trip mechanism. The melting alloy type use a special solder into which a pawl is embedded. D had two versions, Bimetal and Eutectic melting Allow type. I don't know about Furnas in particular.No, not true. It melts, it's melted and you have to buy new heaters. I know that the common Square D heaters don't - they use a low melting temp alloy and when Some will work after they cool down,Īnd some will not. Heaters from different manufacturers work on different physical principles.