The Siren Board

Daniel wrote:I don't mean automotive air horns. I mean Cunningham Air Whistles, Kockums, Kahlenberg, and so forth. If your power supply is that unreliable, air horns will work with a low voltage valve and the compressor does not need to be three phase.

Yes.
The tank is a giant energy storage reservoir. Would hold a charge for a long time. And battery power could release the air in power outages.
But we have the 2t22 and want to use it.
Even though low on its step platform, it can be heard troughout the large park. But NOT inside the pool/rec/office building.

This topic is really turning into a doozy.... you have come up with some creative ideas... I herald you for your creativity..... but you are talking stupid now. Converting it to DC is not a bright idea, you are going to be spending more money than it is all worth. Plus finding a dual shaft DC motor is going to be nearly impossible... the motor area is not large enough to accomidate 2 motors... and even if it was.. how are you going to mount them? They need to be secured so the motor spins the rotor and not the motor itself. You want some back up.... I have an idea... since I am a firefighter and know stuff.... and work with me here. Why not write a grant request for a back up generator for your station? Each year there are 14 rounds of Federal Grants from the Federal Goverment, this year alone my department recieved a grant for $25,000 in Round 2 for a back generator for the station and $225,001 in Round 14 to replace our pumper. As a matter of fact we have gotten grants the last 6 years running, why not try writing a grant? I know, I know... you will come up with some goofy reason why you can't do this and even goofier solution such as using batteries hooked up in series which is a stupid idea that is destined to not work, has absolutley no testing or reliability behind it and unless you are an electrial genius will probably blow itself up. There are many, many options out there for you..... states also have grants, you can get Homeland Security Grants, you can get DCED grants.... there are many grants that you can get that will help you get a back up generator. Why not try to do that instead of trying to engineer some goofy set up with batteries, invertors, capicitors and electrical wave conversion s***, it is a simple solution and it is free. Ask around, I am sure that you have someone in your area that will help you write for this grant if you haven't ever done one. So, no more goofy solutions, no more DC to 3 phase ideas that won't work and are untested, no more anything.... dig your damn trench, move the siren over to the firehouse and put in a grant for a back up generator and quit coming up with these goofy f***ing solutions to a problem that you have already spent way to much time trying to fix.

Spoken like a true firefighter... no bull in this message,

Dave Fritz

YESSSSS! I did not know that Fire Departments could get grants like that, very well said.

Yes.
I am trying to fix a problem that I am creating.

Yes, I learned that 5 hp DC motors are terribly expensive.
I considered separating the 2t22 into a "1t10 and a 1t12"!

Good ideas on the grant.
But we got our grants which were used for apparatus and building extension.

Some refer to me as an electrical wizzard.
I have been working on circuit design to convert stored DC into 240 V three-phase AC.
What is good about placing the batteries in series to get 240 is that it need not be stepped up.
Just a matter of making DC into AC and timing phases 120 degrees apart.
But that also gets tricky with return currents overlapping phases.

You are right about reliability.
What if it blows up? Stuff in theory has a way of doing that, especially when I do not know inrush currents.

So I plan to dig my ditch and bring three-phase.
My Rube Goldberg battery-backup device can wait. Maybe never.

Robert Gift wrote:...So I plan to dig my ditch and bring three-phase.
My Rube Goldberg battery-backup device can wait. Maybe never.

Good Idea!!

Robert Gift wrote:I considered separating the 2t22 into a "1t10 and a 1t12"!

So have you only got one signal option on your siren?

SirenMadness wrote:

Robert Gift wrote:I considered separating the 2t22 into a "1t10 and a 1t12"!

So have you only got one signal option on your siren?

Actually, several would still remain.
Wail, Steady and fast Wail.
"T" apparently means "Tone"
Would be nice to have dampers.

This was because a 10-hp DC motor would be extremely expensive.
Also I would never find a dual-shaft 10-hp DC motor.

Silversearchlight wrote:

Robert Gift wrote:...So I plan to dig my ditch and bring three-phase.
My Rube Goldberg battery-backup device can wait. Maybe never.

Good Idea!!

But come-on.
A RGBB would be a fun challenge!

Robert Gift wrote:

SirenMadness wrote:

Robert Gift wrote:I considered separating the 2t22 into a "1t10 and a 1t12"!

So have you only got one signal option on your siren?

Actually, several would still remain.
Wail, Steady and fast Wail.
"T" apparently means "Tone"
Would be nice to have dampers.

This was because a 10-hp DC motor would be extremely expensive.
Also I would never find a dual-shaft 10-hp DC motor.

Yes, "T" means tone in the meaning of "signal."

Robert Gift wrote:

Silversearchlight wrote:

Robert Gift wrote:...So I plan to dig my ditch and bring three-phase.
My Rube Goldberg battery-backup device can wait. Maybe never.

Good Idea!!

But come-on.
A RGBB would be a fun challenge!

So would putting out the flames after the device catastrophically fails......