3 Phase motor connections.
3 Phase motor connections.
(OP)
i need to connect up a 3 phase motor. my question is; the main cable from the motor has 6 smaller cables in it (1-6) & a earth. i just need someone to remind me how i connect up 6 cables to the panel when only 3 connections are advaiable (red, yellow, blue) from what i can remember you need to use your multi-meter and test across the 6 cables so that you have 3 pairs that are not connected (ohms is 0 or meter does not bleep) am i right in thinking this???
thanks for your help.
alex
thanks for your help.
alex





RE: 3 Phase motor connections.
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If we learn from our mistakes I'm getting a great education!
RE: 3 Phase motor connections.
cheers
alex
RE: 3 Phase motor connections.
RE: 3 Phase motor connections.
Have another look at the linked document. If the core numbers are 1-6 then it is probably a US motor because those aren't standard British markings. The second page shows a six lead NEMA motor with core numbering 1-6 and how to pair them up. There are two options: delta or star connection which depends on how the motor was designed. It could be designed for 240V delta / 415V star connection or 415V delta / 690V star. If there is a nameplate can you post a photo of it?
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If we learn from our mistakes I'm getting a great education!
RE: 3 Phase motor connections.
A part winding start motor will have continuity between two groups of three wires.
A star delta motor will have continuity between three groups of two motors.
I have seen two numbering schemes for part winding start motors:
123-678, and 123-789. Be sure to determine the difference between sixes and nines. Reading a six for a nine or vice versa will result in the second set of windings coming in out of phase with the first set.
(Don't ask me how I know)
Bill
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"Why not the best?"
Jimmy Carter
RE: 3 Phase motor connections.