3 phase motor connection type???

[LEO]

Ha ha, sorry Silva...

Thanks for the info guys.

So where would I get the 690v from to connect it in star? If it's a 3 phase 400v supply, or I take it this would be the incorrect type of motor or the Delta config would suit at 400v??

In a application where the motor had to be connected in star at say 690v as stated on the id plate, where/how would you achieve this?

Sorry to go on but would like to know as much as poss.

Any info guys? Thanks again.

Cheers, LEO.

 

[Knobhead]

660V is used in some US/Canada industrial sites along with 433V. The standard 110/220V domestic supplies would be useless in Industry. As I said in an earlier post the higher the voltage the more power you can ram down a cable.

It’s a pain in the a*se working on a site with 2 different voltages. The works I referred to earlier had another wobbly to throw at you, on the 433V system the phase rotation was RYB, 550V was RBY.

It won’t be the first time I’ve gone to a shift hand over job to find a motor fitted just needing connecting. Check the name plate, right frame size, right RPM, WRONG bloody votage!

 

[LEO]

Cheers guys for your info + help to clear this up.

Excellent forum,

LEO.

 

[vaughant]

We still use some 500 volt stuff where I work,but they are trying to phase it out(no pun intended).If your involved with DC drives at all CEO you can get some mad voltages across them,try 700v DC at the output cables.I remember as someone who should have really known better clipping a cover back onto a siemens drive unit where there were small busbars linking them all together.I was explaining to the machinist how he shouldnt really run it at those voltages without these covers on and the dangers involved so I clipped the cover back while the drive was at it's heaviest load and the metal(poor idea) bit of cable to stop the thing falling off touched the busbar!!Lucky for me I was touching the plastic bit,a big bang and flash of blue/white light and the m/c cut out.I went to explain to the guy that this is a good example of why the covers are required and he had run 30metres away hiding behind a metal bin shaking!!!!Oh well,at least he experienced 1st hand the power of DC drives.I always switched machines off to put covers on after that.They hold voltage for a while as well,it said up to 4 minutes on the name plate which was maybe a touch extreme but we still had 90v DC there after 3 mins once.That would certainly hurt you.