Slow 2t22 rise by wiring motor to 480V on 240V supply?

[JasonC]

Jason, since the load is not that great, would the motor attain full speed 3450 rpm (determined by 60 Hz power) but attain that speed at a slower rate?
Why would/could it burn out?

No, the voltage would be to low to generate enough torque to spin the rotors fast enough and since motors are inductive loads where the amp draw is proportional to the voltage delivered to it (in rough terms) the extra amperage would overheat it quickly. Motors are only designed for a +-10% voltage difference. It would burn out the way nearly all other motors burn out, heat.

[Robert Gift]

But since, I presume, I am placing two coils per phase from parallel at 240V into series for 480V, will that not restrict the amperage draw at 240 volts?
-10% is 216 volts. This is wired for 208-240.
Wish I could derive 208 from this system instead of 240 to see if it makes a difference.
Thanks, Jason.

[JasonC]

Running the siren from 208 volts will slow it down just a tad. You can buy a 240 Delta / 208 Wye transformer to achieve this but its a pointless thing to do.

[Robert Gift]

Yes. But I don't want to waste any money on this.
Thanks Jason.

[500AT]

Every 2T22 that I have encountered that is 480 volt three-phase has a fast pickup. If you want a slower pickup, I would recommend a 240 volt single-phase motor. This would give you the desired effect your looking for.

Sadly, one of the local fire departments, wired up a Federal Model 7 that was rated at 480 three-phase at 240 volts, around 50 years ago. Sadly, during a three-minute tornado test, they succeeded in frying the motor. The siren had to go back to Federal and receive a new motor, which the fire dept. paid for.

[Daniel]

Every 2T22 I've heard has a fairly fast pickup. I think it's just the nature of that model. With regard to that "liquor" that one shouldn't fall into, as a friend of mine who works in water treatment always says, "it would be a sh-tty death!"

[CDV777-1]

I don't care if I sound mean.

This whole deal with this 2t22 is getting ridiculous.
Just hook the stupid thing up to the correct voltage and
be done with it.
I thought this whole project was to get a warning siren
for the people at the trailer park. Do the people at the
park care how fast it winds up? No.

I can't believe the others on the board are entertaining
different ideas about slowing the wind-up of this siren.
What if you do rig up some goofy contraption to slow
the wind-up and then it burns up when the siren is
really needed in an emergency? Is this siren for use as
a warning system or not?

When you fist posted messages on this board I thought
you were all concerned about getting the people at
the trailer park a warning siren. It's very obvious that
this siren is more a thing for you to play around with
than anything else. If your primary concern is to
get some warning to the trailer park you would be
done with it and not be posting these ridiculous questions
about slowing the wind-up etc.

[Robert Gift]

CDV If you don't like this subject, don't read it!

But you are quite correct.
The siren is connected and operating.

I just want to learn if there is an innocuous and elegant way to slow it's rise without going to any trouble - something as simple as switching off a three-phase leg or running 480 V taps on 240.

Apparently I heard a single-phase motor which may not be as powerful and the rise is much more attractive - more like the English sirens.

[q2bman]

What about a huge expensive inline resistor bank to dam up the current available for the motor on start-up?

[texaschad25]

Hey Robert, mine is 3 phase like your siren but i plan on letting the electric company wire it up and let it go. I am like you and have noticed that some of the 2t22's have slower wind up so I am thinking that they are single phase. I'd just "leave-it-B" and let it work for you. I'd hate to see it fail you in a time of need.
Chad