S
smith1990
Hello can you tell me the best way to tell wether to connect the motor in delta or star. If the name plate has a star and a delta symbol on it .
Discuss star ? delta? in the UK Electrical Forum area at ElectriciansForums.net
sounds like you have a dual voltage motor. if supplying @415V think about it. in star, you'll have 240V across each winding ( line to star point) but if you connected it in delta, then you get 415V across each winding. goes like stink but won't last 5 minutes.
But it will be faster to stink.....if it's 400V across a 230V winding.Wouldn't want him to get the impression that it will run faster if connected in Delta. Chiefly, it's number of poles and frequency that determine speed! Ns = (120 x f)/p :smilewinkgrin:
With the correct voltage applied for the given configuration, the motor will develop the same torque for star and delta.Torque will also be effected.
sounds like you have a dual voltage motor. if supplying @415V think about it. in star, you'll have 240V across each winding ( line to star point) but if you connected it in delta, then you get 415V across each winding. goes like stink but won't last 5 minutes.
Hi, if it's bog standard 3 phase motor, then normal running will be delta.
Star is used if the motor has a heavy load to get moving. Star configuration limits the current drawn so you don't blow the fuses.
It will be in star for 5 to 10 seconds then switch over to delta.
If there is no heavy load, then delta only is fine.
The speed of the motor is governed by the supply frequency and the number of poles in the motor. So it should be about 3000 rmp whether in star or delta.
Hope this helps.
Hi Tony, Having re-read the OP, he makes no mention of dual voltage.I notice this is your first post so I will give you a tip.
Read the OP (opening post) first.
We are talking of dual voltage not Y∆ starters. Added to which I certainly wouldn’t be considering Y∆ for a high inertia load.
Hi Tony, Having re-read the OP, he makes no mention of dual voltage.
It's your post (post number 3) that mentions dual voltage.
And I don't believe 240 volt 3 phase systems are very common.
All the best
240v y
415v ∆
Hi Tony, Having re-read the OP, he makes no mention of dual voltage.
It's your post (post number 3) that mentions dual voltage.
And I don't believe 240 volt 3 phase systems are very common.
All the best
Dual voltage motors have windings rated at 230 volts. If the supply voltage is 400v you connect in star, if the supply voltage is 230 volts you connect in delta. The reason for this is when you connect in star you are connecting across two windings hence 400 volts. With delta you connect across one winding hence 230 volts.
With this motor if you put 400v in delta you will burn out the motor. If you put 230v across the windings in star you will only develope one third of its power and will stall under load.
Reply to star ? delta? in the UK Electrical Forum area at ElectriciansForums.net
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