Messed Up Model 5BT-Question

[Mark N]

https://www.youtube.com/watch?v=iNTVh3VSwjI
From what I heard, this 5BT is missing a rotor or something. However, why does it sound like its spinning so fast, as if the motor was running above 60Hz?
(Not my video) Credit to Sirenfan97 (YouTube)

[coastalsyrolover]

I don't know how correct this is but I think it's because the higher tone of the dual tone is the one that's sounding thus making it sound higher pitched than the single tone model 5... Like I said I don't know how correct that is though.

EDIT: After going out and listening to model 5Ts that theory is completely incorrect. Maybe it's getting too much power? I don't know.

[Stormsetter4]

I have a feeling that the motor is on the fritz.

[DJ2226]

It's a repulsion induction motor. The speed is not locked to a certain frequency like 60 Hz, similar to the universal motor that drives the Model 2. Things like the voltage and brush angle play with the speed, which is one reason why Ian's Model 5B runs at a slower speed than a three phase siren. These can spin faster than a normal induction motor as well. If the siren in that video is indeed a 5BT, then its rotor must have been replaced with one from a single tone siren, but I doubt that anyone would go through the trouble of that. I think it's just a regular 5B.

[Archon]

They is nothing wrong with this siren it has a RSRR Motor that has the Brush holder advanced a little to far.

[Rheems1]

I have a feeling that the motor is on the fritz.

This is like the 10th thing this month that has been on me, last week it was a refrigerator, a transmission, motor, a camera and now there is a siren too.... I am tired of everyone dumping all of their crap on me ROFL

[Stormsetter4]

I have a feeling that the motor is on the fritz.

This is like the 10th thing this month that has been on me, last week it was a refrigerator, a transmission, motor, a camera and now there is a siren too.... I am tired of everyone dumping all of their crap on me ROFL

Thanks for the laugh.

[ENec]

Anyone else think it sounds like a 2001?

[Mark N]

Anyone else think it sounds like a 2001?

Definitely thought so myself; also sounds like the 2T22B at some school in Wichita; the one with the stuffed bottom intake.

[MKIIProductions]

I questioned Emergency Management on this unit a while back, and I have a few close-up pictures of this unit somewhere on Facebook. Since I am at school, I will edit them into this post later on.

Randy Duncan, his tech staff and I bulled on this siren for a while, and we eventually came to the conclusion that this unit had a 12 port rotor placed into a 9/12 dual tone assembly. This was likely the product of the old rotor either cracking or shattering, and not having a replacement rotor.

This would likely be the cause of this unit producing such an odd sound. I will look back in my pictures later to see if this was really the case, because the top row of port openings in the stator looked quite odd with how they matched up with openings in the rotor.

This siren (and the 2T22B at Black Elemetary) were both removed, however, the 5BT was the only replaced by an ATI HPSS32.