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What is the use of wye delta? - RTO Telemecanique Gv2 Ls22 Magnetic Circuit Breaker

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I don't know why your question is bound to this special breaker.

If your question is common, the wye/delta is a way to reduce the starting current of a large three phase asinchronous motor.
When a three phase motor is first connected in wye (star), the starting (peak) current is about 3 times less than this in delta. When already in motion the electromotive force will make the peak current when turned in delta much less, than that with a stopped motor.

Posted on Aug 08, 2010

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Posted on Jan 02, 2017

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How to solve the GFF error in delta Vfd-g


A GFF error on most Vfd's refer to a in-proper ground, no ground detected , or a possible ground loop. Ground loops are a common mistake, where in the attempt the user grounds two or more devices or the load to the vfd as well as the mains ground.

the model your using is a three phase input, it can handle delta or wye, style of wiring, but all require a good ground source. If anything, just run a dedicated ground to each device and don't run ground wires to each other. It's only used for voltage reference between the phases. Without it, the vfd cannot work properly and will error.

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3phase to 1phase transformer


when your dealing with a high leg as long as your using two phase wires it is balanced. any two legs will give you 240 volts a.c.

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1 Answer

Wiring schematic for a 1971 Reuland 3 phase # Hp. electric motor for a grinder pump


Its going to depend on whether you are connecting to 240 volt or 440 volts...

It also depends on whether it is a 'wye' wound motor or a 'delta' wound motor.

A nine wire motor is probably a multi-voltage motor capable of running on either 240 or 440 volts. For operation on low voltage, 240 v, the windings must be connected in parallel whereas hi voltage operation makes it necessary to have the windings wired in series.

I will not give the details on the winding connections because the process to determine whether it is a 'delta' or 'wye' wound motor is too involved to derscribe on a forum. But..... if it is a 'wye' wound motor, there will be three additional wire connections 10, 11, and 12, that are wired together and under the end bell and not accessible.

We don't want to 'smoke' your motor, so let the suggestion be to contact a reputable and qualified electrician who you trust to determine what's required and to connect it without the potential for damage.

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1 Answer

Wiring a dimmer switch with 208vac, single pole


208 Volt 2-wire is generally achieved by pulling two hot wires off 3-phase 120/208 Wye or 208 Delta, or Highleg to center tap off high leg delta.
http://waterheatertimer.org/How-to-wire-3-phase-electric.html
http://waterheatertimer.org/images/3-phase-timer-diagram3-T104-208-240.jpg

Since each of these three phase systems also offers 120volt for lights, and a dimmer can be used for lights, then I wonder what you are using dimmer for?

208 volts.can be controlled by turning off one hot of the two hot wires.
Install dimmer on one of the hot wires, and see what happens.
Is the dimmer rated for 208 volts?

Add a comment and say what you discover.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Jan 03, 2013 | Generac HTSN400G 400Amp HTS 3ph 120/208V...

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Make a connection of a 6-leads, 3-phase motor in delta and wye connection


connection would be easier in the wye. single phase current is easier to pull of of one leg in the wye to get your common that you would not have in a delta connection. three phase doesnt require a nuetral. just 3 phase 120degrees out of phase from each other

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1 Answer

I have a 15kw motor driven off a siemens micromaster 440. I cannot get the motor to run in delta. I have to run it in star. I have similar drives on site and these motors are connected in delta. what...


Why do you want to run the motor in the delta configuration? The VFD will change the speed to anything you want to do. The delta and Wye connections are normally used to change the speed of a motor. That's what the VFD is for...??

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

Sep 28, 2009 | Inverter Siemens Micromaster 440

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