UK FS 2001-130 test!

[Eclipse DDS]

Good day folks,

Today at 4:30 PM, the piercing sound of a Federal Signal 2001 echoed across Carrington Business Park in Manchester. Turns out, it does so every Thursday! [EDIT: I mean Wednesday, oops]

Thanks a lot to TG Technologies and HM SirensAndFireAlarms for notifying me of this test!

https://youtu.be/xPcnnM37x3w

[traintraveler]

Good day folks,

Today at 4:30 PM, the piercing sound of a Federal Signal 2001 echoed across Carrington Business Park in Manchester. Turns out, it does so every Thursday!

Thanks a lot to TG Technologies and HM SirensAndFireAlarms for notifying me of this test!

https://youtu.be/xPcnnM37x3w

I wonder what that would sound like if it was hooked to AC power.

[al66class59]

Good day folks,

Today at 4:30 PM, the piercing sound of a Federal Signal 2001 echoed across Carrington Business Park in Manchester. Turns out, it does so every Thursday!

I assume, given the date of upload, you meant every Wednesday? Posts on the local subreddit would certainly support that idea

[Eclipse DDS]

Good day folks,

Today at 4:30 PM, the piercing sound of a Federal Signal 2001 echoed across Carrington Business Park in Manchester. Turns out, it does so every Thursday!

I assume, given the date of upload, you meant every Wednesday? Posts on the local subreddit would certainly support that idea

Ah dang it, yeah sorry! XD
I have no idea where I keep getting Thursday from, I've made this mistake several times now!

[BBoi00]

Good day folks,

Today at 4:30 PM, the piercing sound of a Federal Signal 2001 echoed across Carrington Business Park in Manchester. Turns out, it does so every Thursday!

Thanks a lot to TG Technologies and HM SirensAndFireAlarms for notifying me of this test!

https://youtu.be/xPcnnM37x3w

I wonder what that would sound like if it was hooked to AC power.

It would sound the same, because no matter what, that siren is powered by dc power.

There's a transformer that turns the 240vac (typically) from the power grid into 48 vdc for the siren.

When the power goes out, a relay kicks out and switches to the dc battery bank. When ac power is restored, the relay pulls back in and switches to the 48vdc coming from the transformer.

[traintraveler]

Good day folks,

Today at 4:30 PM, the piercing sound of a Federal Signal 2001 echoed across Carrington Business Park in Manchester. Turns out, it does so every Thursday!

Thanks a lot to TG Technologies and HM SirensAndFireAlarms for notifying me of this test!

https://youtu.be/xPcnnM37x3w

I wonder what that would sound like if it was hooked to AC power.

It would sound the same, because no matter what, that siren is powered by dc power.

There's a transformer that turns the 240vac (typically) from the power grid into 48 vdc for the siren.

When the power goes out, a relay kicks out and switches to the dc battery bank. When ac power is restored, the relay pulls back in and switches to the 48vdc coming from the transformer.

-what i meant was a theoretical 2001-130 that ran with an 240vac motor on 50hz, not any regular production model. sorry

[BusBedford87]

Unbelievable recording- sounds so surreal to hear in the UK. What’s this siren used for?

[Eclipse DDS]

Unbelievable recording- sounds so surreal to hear in the UK. What’s this siren used for?

I believe the siren is used as a site-wide fire alarm since it is tested alongside the smaller sounders, however there appear to be a few chemical works in the estate so it may also be used in the event of a spill.

[RamJett]

Awesome man! I always wondered what that 130 would sound like echoing through the business park. Nice recording

[DJ2226]

Good day folks,

Today at 4:30 PM, the piercing sound of a Federal Signal 2001 echoed across Carrington Business Park in Manchester. Turns out, it does so every Thursday!

Thanks a lot to TG Technologies and HM SirensAndFireAlarms for notifying me of this test!

https://youtu.be/xPcnnM37x3w

I wonder what that would sound like if it was hooked to AC power.

It would sound the same, because no matter what, that siren is powered by dc power.

There's a transformer that turns the 240vac (typically) from the power grid into 48 vdc for the siren.

When the power goes out, a relay kicks out and switches to the dc battery bank. When ac power is restored, the relay pulls back in and switches to the 48vdc coming from the transformer.

Given the pitch at which it peaks, it's already running on AC. If I'm not mistaken, the rectifiers tend to come set for 208 VAC, and the installers typically connect them to a 220 or 240 VAC source without changing the tap. When the motor is fed 48 VDC, the siren will peak at around 690 Hz since the motor at that voltage will spin at around 3450 RPM. Typically, batteries will float slightly above 12 VDC, so the sirens will run faster and peak in the 740 Hz range on DC power. When they get overvolted by the rectifier, they'll run upwards to 800 Hz and sound like a 16-port Sterling. This is the same with any other DC-powered siren. The Tempest sirens in Culver, IN are a good example of this. You usually expect an AC-powered T-112 to peak in the 540 Hz range, but their sirens have been set to where they actually get 48 VDC right off the rectifiers, so they peak at 465 like any other normal 8 port siren on a 60 Hz grid. I think ASC intentionally overvolts the T-112, T-121, and T-128 to get them to peak over 500 Hz, so whoever worked on these sirens may have actually set the rectifiers to run on 220 or 240 and fed them 208 VAC.


https://www.youtube.com/watch?v=Ol6ac9C4NJc