Trevor WI Allertor It's Seriously SICK!

[Archon]

Trevor WI Allertor. Recorded 3-26 07 at 6.pm. It is only 20 feet off the ground. No problem It only get up to 1/3 it's speed. There is seriously something wrong with it, it is 3 phase. 8/12 This is the worst sounding siren I have ever heard. Only sounds at noon and six there is a P-50 right next to it for tornados. Have already sent letter to them stating that it's needs some help soon, like yesterday.

Here is the wav filehttp://media.putfile.com/Trevor-WI-Allertor

Here is the picturehttp://www.putfile.com/pic.php?img=5079627

[Justin]

Maybe the motor is on it's last legs?

[Robert Gift]

Nice catch, Archon!
Always interesting hearing a siren at low rpm.

Why don't they place that siren at the roof crest?
It is little more effort to place it there, and it will not be blocked by the roof and be so close to people entering the station.

Would it's three-phase motor run on just two phases?
Does it's rotor motor also turn the siren?

At least it looks well cared for.

[jerrylovessirens]

Maybe they are running it at 240 3-phase, instead of 480? Or, like Justin said, it could just be that the windings are almost shot. At 36 seconds it still was accelerating!

[Justin]

I also thought of the Two phase thing as well, but that would have fried the motor for surely?

[Gil]

I also thought of the Two phase thing as well, but that would have fried the motor for surely?

Most likely.

That siren is seriously ill. Hopefully it will get fixed and not scrapped.

To answer Robert's question, yes. One motor does all. There was the Allertor manual posted a while back (I think i have a printed copy, and yes i'll scan it) and it showed that on most Allertors, there is a gear reducer connected to the other end of the motor, which turns the rotator.

[Robert Gift]

Thanks, Gil.
Yes, I remember now.
It is frustrating when I become unsure of things I once knew.

You are correct. If you lose a leg, the remaining coils can burn out under load. (Hopefully they have thermofuses to prevent burnout.)
It is most likely to be undervoltaged.
But I would expect them to have properly wired it to 240 if they had 240. If voltage is 208 and motor is wired for 240, it would be about 10% less efficient.

[500AT]

Someone please call the siren doctor! Sounds like the motor is shot, or is not receiving enough voltage. However, I feel that it can be rebuilt and at the same time raised to a higher level, which will result in more effective sound propagation. Is this the only siren in town?

[SirenMadness]

That Allertor sounds pretty nice to me, as well as pretty sick.
Putting that Allertor on the top of the roof would have been too complicated and costly if all that the Allertor was meant to do was to warn the station.

[Archon]

The problem with this allertor is a one of the phase's is grounded out somewhere in the line.