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<blockquote data-quote="spark-doctor" data-source="post: 28475" data-attributes="member: 1103"><p>So the factory gaffer called in a specialist motor firm (cant remember the name) who said the motor is ******** &amp; the reason is down to the top electrician single phasing (was the term used I think) the windings.........basically he'd wired it wrong</p><p></p><p>Have seen this to many times when inexperienced people try to wire 3 phase motors.</p><p></p><p>The term "single phasing" is when one of the phases drops out or is not correctly wired and will burn out the next phase in the rotation cycle. By the sounds of it "The Top Spark" bridged out the fuse and the winding burnt out and was running on 2 phases.</p><p></p><p>Have seen it when a motor was protected by 3 old BS88 fuses, one pops so the operator holds in the start button, next thing is loads of smoke and a nice burning smell</p></blockquote><p></p>
[QUOTE="spark-doctor, post: 28475, member: 1103"] So the factory gaffer called in a specialist motor firm (cant remember the name) who said the motor is ******** & the reason is down to the top electrician single phasing (was the term used I think) the windings.........basically he'd wired it wrong Have seen this to many times when inexperienced people try to wire 3 phase motors. The term "single phasing" is when one of the phases drops out or is not correctly wired and will burn out the next phase in the rotation cycle. By the sounds of it "The Top Spark" bridged out the fuse and the winding burnt out and was running on 2 phases. Have seen it when a motor was protected by 3 old BS88 fuses, one pops so the operator holds in the start button, next thing is loads of smoke and a nice burning smell [/QUOTE]
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