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Anonymous Poster

faceplate starter

06/03/2007 1:21 PM

am doing an engineering apprenticeship and was lookin for some info, please help!

how does a faceplate starter operate when an overload occurs?

what is meant by a soft start device?

how do you carry out an open circuit test on a star connected 3phase synchronous generator?

all info much appreciated

thanks

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Guru
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#1

Re: faceplate starter

06/03/2007 8:24 PM

What the heck is a "faceplate starter"?? Never heard that term before. Must be some computer generated permeation of a translated term. If you mean a motor starter, an overload will cause the Overload Relay to heat up and trip. When the relay trips, it releases a mechanism or an electrical contact that causes the contactor to open, cutting off power to the motor.

A soft starter is an electronic version of a motor starter which only allows the voltage going to the motor to increase slowly instead of come directly on. Since torque in a motor varies by the square of the applied voltage, the motor torque ramps up very slowly, or "softly" and there is little or no mechanical shock to the system. Then also, becasue motor current varies directly with torque, the current that the motor draws from the line is reduced as well, which often helps prevent flicker or line voltage drop on starting the motor.

Don't understand what you mean on the open circuit test. An open circuit is an open circuit.

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#2
In reply to #1

Re: faceplate starter

06/04/2007 10:24 AM

"What the heck is a "faceplate starter"??"

Faceplate Starter, Mid Page!

Don't recognize or know a term? Enter in <Google.com>, nothing, well almost nothing, easier! Alternatively use <Dogpile.com>.

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Guru
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#4
In reply to #2

Re: faceplate starter

06/07/2007 11:26 PM

"

"What the heck is a "faceplate starter"??"

Faceplate Starter, Mid Page!"

Huh. I'll be damed. I've looked at and repaired and replaced those for years, never heard them called that before. Everyone I know calls them tap changers. They used to be very common on wound rotor motors used in the ski lift industry, but most have been replaced by VFDs now. Learn something new every day.

And yes, I do know how to use Google, but it wasn't my thread and I was being lazy

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#5
In reply to #4

Re: faceplate starter

06/08/2007 1:38 AM

Example of one I pulled out... just never knew that name!


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#3

Re: faceplate starter

06/04/2007 10:28 AM

"am doing an engineering apprenticeship"

To whom are you apprenticed?

Why is he not guiding you through your apprenticeship?

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