One Quarter of Franklin County Sirens DEAD

[JasonC]

In one of the TV news stories, an EMA employee said they think that the "amplifiers shorted out".

In other words, the output transistors blew out (most likely by overheating).

[Justin]

If my geography serves me correct, your only just getting over summer?

Maybe the constant 35?C-40?C (95?F-104?F) heat started eroding these components? Hell if they weren't heat sunk properly, I wouldn't be surprised that such blow outs didn't happen sooner.

[AllAmericanFE]

If my geography serves me correct, your only just getting over summer?

Maybe the constant 35?C-40?C (95?F-104?F) heat started eroding these components? Hell if they weren't heat sunk properly, I wouldn't be surprised that such blow outs didn't happen sooner.

Its been alot hotter before and we have never had this problem. It was because Columbus Fire set the sirens off way too many times without a resting period.

[Rory Buszka]

These siren drivers use ferrofluid in their magnetic gap to enable high power handling. The heat from the driver is conducted through the oil-like fluid to the magnet top plate and pole piece. This works okay for a while, but eventually the steel parts of the motor structure become saturated with heat, and there isn't as much cooling happening.

[scooterbugs25]

Its been a lot hotter before and we have never had this problem. It was because Columbus Fire set the sirens off way too many times without a resting period.

a speaker Needs a resting period? These sirens have controls. do they not have a computer program that runs them 3 mins on 7 mins off?? Im sure they did not stand there and just keep turning them on and off with the push of a button, It is Columbus not a rural town in the country somewhere..

[AllAmericanFE]

Columbus fire set them off manually for the whole warning.

[scooterbugs25]

Columbus fire set them off manually for the whole warning.

oh wow~ Would that still make a speaker over heat?

[AllAmericanFE]

Columbus fire set them off manually for the whole warning.

oh wow~ Would that still make a speaker over heat?

The speaker did not overheat it was the amplifiers that overheated. Some of the drivers did blow but I think they were getting ready to blow anyway.

[scooterbugs25]

As Franklin County prepares to pay up to $150,000 to repair its toasted tornado-siren system, commissioners are asking for a broader, better plan to protect the pub....

http://www.columbusdispatch.com/live/co ... ml?sid=101