how to wire star delta connections of a motor with on delay timer ?

[munzir]

how to wire star delta connections of a motor with on delay timer ?

Also when to use on delay timer and when to use of delay timer ?

can i have their schematics ?

thanks
take care
best regards

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the motors that are used with star delta configuration are changed with the motors that are only used directly with either in star configuration or directly only in delta configuration ?

what general names they have ?

 

[chuckey]

Motors that can be wired for star/delta are multi voltage motors such as 230/415V. If the motor has fixed start OR deltas wiring then they are fixed voltage eg. 415V.
Frank

 

[munzir]

Motors that can be wired for star/delta are multi voltage motors such as 230/415V. If the motor has fixed start OR deltas wiring then they are fixed voltage eg. 415V.
Frank

how much power can we be save by using star delta configuration ?

how much power can we be save by using soft starters ?

how much power can we be save by using vfds ?

thanks a lot

 

[kak111]

Here is two version for control wiring,
power wiring to motor is same for both.
Motor must be 230/400V. ( Star/Delta)

 

[rfredel]

Hello munzir,

you don't realy save power by using star delta configuration.

You only reduce the starting current. Y / Δ configuration is a softstarter.

Vfd is to regulate the speed of the motor. You can do like this, but is more expensive then a Y / Δ switch.

Regards

Rainer

 

[munzir]

Hello munzir,

you don't realy save power by using star delta configuration.

You only reduce the starting current. Y / Δ configuration is a softstarter.

Vfd is to regulate the speed of the motor. You can do like this, but is more expensive then a Y / Δ switch.

Regards

Rainer

can i have the circuit schematics for the soft starter of 700KW ac 3 phase induction motor ?

Also, you told that star-delta and soft starter are the same thing, are they ?

thanks a lot

 

[rfredel]

Hello munzir,

I can't give you a schematic of a soft starter, because I don't have.

Also, you told that star-delta and soft starter are the same thing, are they ?

Yes, star - delta is one form of soft start. In star circuit the motor starts with 1/3 of power then in delta. So it is a soft start.

Regards

Rainer

 

[munzir]

Hello munzir,

I can't give you a schematic of a soft starter, because I don't have.


Yes, star - delta is one form of soft start. In star circuit the motor starts with 1/3 of power then in delta. So it is a soft start.

Regards

Rainer

Wouldn't you make/prepare any for me ?

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Here is two version for control wiring,
power wiring to motor is same for both.
Motor must be 230/400V. ( Star/Delta)

View attachment 85324

View attachment 85325

View attachment 85326

you didn't use off delay timer in both of your schemes, kak ?

i asked with off delay timer too ?

 

[rfredel]

Hello munzir,

sorry, I can't give you a circuit like this. because my normal work is audio and communications engineering. I have only basic knowledge in power electronics and electronic motors what I have learned during my studies 40 years ago. Circuits with contactors like the star - delta circuit is no problem for me.

For this high power I would use a industrial built starter. I think it is cheaper then to built it yourself.

Here you find basics and circuits for motors and high power switches.



I hope that will help you.

Regards

Rainer