No. It's on a timer. Period the end. There's nothing stopping someone from immediately restarting the unit.Branden0925 wrote:That's why. If a Whelen runs longer than 5 minutes, it will shut off. It does that to protect the components of the siren and the controller.
That's what I meant to say. Sorry and thanks for clearing that up.uncommonsense wrote:No. It's on a timer. Period the end. There's nothing stopping someone from immediately restarting the unit.Branden0925 wrote:That's why. If a Whelen runs longer than 5 minutes, it will shut off. It does that to protect the components of the siren and the controller.
Logan countys ema here in Colorado installed radios in every town in the county with sirens. Last summer, (first year with county wide simultaneous activation) Sterling's dispatch would send out Alert tones, and Fleming's two sirens ran at least 20-30 minutes each activation not including the Friday 30 second weekly test. I've heard the SD-10'S motor is starting to go out according to local firemen. Sorry if this seemed to derail the topic.uncommonsense wrote:Whelens default to a 3 minute cycle time (adjustable to a max of 5 mins) Same thing with ANY siren on a timer. Very few places run them continuously during a storm.
And there was also a variant of each that ran for five minutes, I think it was AR-5 and AF-5 but I'm not sure.Daniel wrote:AR and AF timers had a timing motor that made one revolution every three minutes before cancelling itself.
Correct. The only exception that I'm aware of is any of Sentry's AC-powered sirens, which have fan-cooled motors rated for continuous-duty operation. A lot of ACA's omnidirectional sirens could have easily been continuous-duty (or fairly close to it) as well if they had only provided enough clearance in the siren's bracket/shroud design on the Screamer and Banshee, for the motor's cooling fan and its cover to remain in place. Both of those sirens' motors have a little stub shaft poking out the opposite end bell, which in normal applications is where the fan would be mounted (under a cover) to provide airflow over the motor for aiding in cooling, and on rotational ACA sirens is where the gearbox would be driven from. What their reasoning was for removing those components and not incorporating that into their siren designs is beyond me.Ziginox wrote:All electric motors have a duty cycle, and I believe (Ian can correct me if I'm wrong here) that most of the ones used in sirens have a duty cycle of around thirty minutes. If they run too long the motors will overheat and all sorts of nasty stuff happens (field winding insulation melting, causing the wires to short, etc.) Electronic sirens have a driver that moves, which creates heat. Run that too long and it melts.
Yup, that's it.Ziginox wrote:And there was also a variant of each that ran for five minutes, I think it was AR-5 and AF-5 but I'm not sure.
http://youtu.be/UDU5mkIi1-EZiginox wrote: There was also video of a T-128 on fire after getting stuck on somewhere, but I can't seem to find it right now.
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