Author Topic: help: old brook crompton motor wire colours for star  (Read 274 times)

Offline Andrew Wildman

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help: old brook crompton motor wire colours for star
« on: October 14, 2017, 12:34:04 PM »
Hi All,
I am completing my grinder and I am wiring it for 415v (star).  The previous owner had it wired delta for 240v.
Having looked at it I think it should be connected:

red - terminal a
yellow - terminal b
blue - terminal c
black, white, brown - neutral

(I realise I may have to swap the individual wires to terminals a,b or c to get the motor rotating in the correct direction)

Can somebody check whether this is usual convention

Thank you!  :mmr:

Offline philf

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Re: help: old brook crompton motor wire colours for star
« Reply #1 on: October 14, 2017, 12:44:21 PM »
Andrew:

Craynerd posted a photo some time ago which tallies exactly with what you're proposing:



Phil.
Phil Fern
Location: Marple, Cheshire

Offline Andrew Wildman

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Re: help: old brook crompton motor wire colours for star
« Reply #2 on: October 14, 2017, 01:03:11 PM »
thanks.
I have also checked that all the windings are connected to the start point (ie no winding has both end going to neutral) so I think it is ok...
let's plug it in and see if the magic smoke stays in :)

Offline hermetic

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Re: help: old brook crompton motor wire colours for star
« Reply #3 on: October 14, 2017, 02:39:24 PM »
You do know that you do not connect a neutral to the N connection on three phase. This is just a blind bolt to connect the three winding ends together when using the star connection. You can take a neutral FROM here and use one other phase connection to get a single phase feed.

Offline Andrew Wildman

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Re: help: old brook crompton motor wire colours for star
« Reply #4 on: October 14, 2017, 02:43:07 PM »
thanks all.  Motor working fine!

hermetic, yep its just a star point

Offline hermetic

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Re: help: old brook crompton motor wire colours for star
« Reply #5 on: October 15, 2017, 02:20:46 PM »
Good Show!!