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Asunc motors don't have brushes
Don't rub it in, I feel bad enough already... :(

But at least I can spell async... :lol:
 
I agree with Tony, the existing MCB is too small to handle the changeover transient (voltage/current surge) when changing from star to delta. Rather up-size the MCB according to the supply cable and let the overload or manual motor starter protect the motor.
 
I would have said the 5 second star - delta change over is a wee bit fast , would you not want a figure of more like 10 -15 seconds at least ?
 
Hi Gents,

i am just trying to get the attachment for a couple of Tonys posts here on motors, but it does not seem that the attachments are working?? or am i just being a dope?

thanks.
 
I would have said the 5 second star - delta change over is a wee bit fast , would you not want a figure of more like 10 -15 seconds at least ?

Yes this time is a bit tight, I WOULD up this time to around 10s and see how it affects the changeover current, you will do no harm and it takes little time to do. I will probably get shot down, but would think twice before considering to upsize the c/b as the problem was there before the new 63A c/b was fitted and the c/b is primarily to protect the circuit cabling. What size fuses were blowing in old CU ?
Has the motor load increased due to mechanical/process issues recently ?
Oops just seen the age of this post, apologies !! Frosty what was the outcome ?
 
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