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Wiring a star delta pump DOL
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<blockquote data-quote="apprentice87" data-source="post: 434066" data-attributes="member: 13534"><p>Hi Tony, Yes, i read something years ago about the sort of thing you are on about when drying out motors that had low IR due to being stood unused for ages</p><p></p><p>Hi Lurch, Yes that is what i thought. I think what the person that wrote the thing was trying to do, was to explain this sort of thing, only not explaining it very well..</p><p></p><p>"First confirm U, V and W windings, by doing continuity test. Then follow the procedure given below.</p><p></p><p>1.Connect V and W windings in series.</p><p></p><p>2.Connect 110V/230V AC to U winding. In this case let us consider 230V is applied to U winding terminals.</p><p></p><p>3. Measure the voltage between V and W series circuit. If the meter reads about 460V, then opposite polarities are connected at the junction of V and W winding (V2 and W1 or V1 and W2)</p><p></p><p>4. If the meter reads about 0V. Then same polarities are connected at the junction of V and W winding (V1 and W1 or V2 and W2)</p><p></p><p>Repeat the same procedure to find U1 and U2 also.</p><p></p><p>But do it safely without touching any terminals during applied voltage."</p><p></p><p>I "think" what they are getting at, is, that if you join two windings in series, and apply power at one end and to the junction of the two windings, [in the middle if you like] you will, in effect, have made an autotransformer of sorts and by measuring the voltage across the pair of them you will then know the orientation of the second winding. [I think!!]</p><p></p><p>I have a motor here i can experiment on, might have a go and see what happens..!!!</p><p></p><p>john..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 434066, member: 13534"] Hi Tony, Yes, i read something years ago about the sort of thing you are on about when drying out motors that had low IR due to being stood unused for ages Hi Lurch, Yes that is what i thought. I think what the person that wrote the thing was trying to do, was to explain this sort of thing, only not explaining it very well.. "First confirm U, V and W windings, by doing continuity test. Then follow the procedure given below. 1.Connect V and W windings in series. 2.Connect 110V/230V AC to U winding. In this case let us consider 230V is applied to U winding terminals. 3. Measure the voltage between V and W series circuit. If the meter reads about 460V, then opposite polarities are connected at the junction of V and W winding (V2 and W1 or V1 and W2) 4. If the meter reads about 0V. Then same polarities are connected at the junction of V and W winding (V1 and W1 or V2 and W2) Repeat the same procedure to find U1 and U2 also. But do it safely without touching any terminals during applied voltage." I "think" what they are getting at, is, that if you join two windings in series, and apply power at one end and to the junction of the two windings, [in the middle if you like] you will, in effect, have made an autotransformer of sorts and by measuring the voltage across the pair of them you will then know the orientation of the second winding. [I think!!] I have a motor here i can experiment on, might have a go and see what happens..!!! john.. [/QUOTE]
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