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Do-It-Yourself (DIY) Question & Answer Forum
isolators and motors
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<blockquote data-quote="spudmiester" data-source="post: 28454" data-attributes="member: 1587"><p>When you buy a self contained starter, there is usually no overload with it, you buy the correct rated one for your job and fit it in the starter box</p><p></p><p>Cant find my little black motors book, but with some VERY rough calcs, I recon your motor is about 5KW.</p><p></p><p>To avoid switching motor currents with the isolator, you could take an extra pair of cores to the isolator auxillary pole (if it has one), and series it up with the contactor coil. The auxillarys are usually 'early break' so will drop out the contactor coil and cut off the 3 phase before the isolator actually breaks the motor supply, therefor not switching under load. This is fairly common in some industrial applications.</p></blockquote><p></p>
[QUOTE="spudmiester, post: 28454, member: 1587"] When you buy a self contained starter, there is usually no overload with it, you buy the correct rated one for your job and fit it in the starter box Cant find my little black motors book, but with some VERY rough calcs, I recon your motor is about 5KW. To avoid switching motor currents with the isolator, you could take an extra pair of cores to the isolator auxillary pole (if it has one), and series it up with the contactor coil. The auxillarys are usually 'early break' so will drop out the contactor coil and cut off the 3 phase before the isolator actually breaks the motor supply, therefor not switching under load. This is fairly common in some industrial applications. [/QUOTE]
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