![]() We were plagued with false alarms and troubles. We had an EST panel installed in a large high school. PH: 72 E-mail: Pecore, BSEET, MBA, Power Quality Engineer for the life Safety Industry.always inventing something new to fix a new problem. ![]() Since it was a Siemens Panel, and the operating voltage was floating around 28V, I suggested that the FA60NC should do the job nicely. Stay tuned in, to find out the results after Josh installs the unit. I have to believe it is a grounding differential issue causing this noise. I told Josh, ten or so years ago, we did not have these types of issue, but since fire alarms are changing so much with lower pf capacitance, the LC circuit capacity is diminishing. Happy New Year, well we will start out this year with another noise problem, this time on a Siemens panel. The way Josh explained it it is a church separate yet attached building in Oregon that is having some noise on the SLC loop line. When I know more, I will update you on this. The fire alarm panel was having all sorts of issues not isolated with noise. So I sent him a LS-E120HWCP20CB surge suppressor, one Notch filter (Spike Block), four FA30VB for the SLC loops, eight Fa90VB for the EVAC loop. This should quite down the panel.I have to believe the new panels are a bit weak on the pf capacitance so it would be fairly easy for these issue to affect the panel. All this impedance I am putting on the panel, and a ground filter should quite the panel. A few week later He contacted me today and told me that my resolution was absolutely perfect and ordered eight more FA 30BH. He also had another challenge that showed something else as a problem on one specific panel and it had EVAC loops at 70-90 volt. I have written earlier as an attachment that the University of North Georgia has been experiencing this issue that I wrote about it. Since he had a bunch of Firelite on campus and noise was the major issue on the NAC loop, I sent him four FA 30BH, units for the NAC loop. So if there are any Fire Alarm Manufactures have issues out there with their dealers with these mystery problems, I think I got you covered. (72 x 1) So the manufacture is limiting LC circuits inside the panel. I think there is a reason why so much of this is popping up as a problem. I think the pf capacitance of the panel has dropped considerably over the years with the use of SMT technology and switch mode power supplies. $69.95 is the retail cost, so if your a dealer, you get a hefty discount. All three of them are not expensive for the fix. Listening does help an awful lot. These two specific products that work in this area is the FA30BH (30 volt area), FA60NC (34.4 volts and up) and FA90VB for Audio circuits. I can also put this on the telco side as well DLTTOS200V-F or RJ31X DSL pacifier. So much of what I try to do for surge suppression, my experience is influenced by this with my design. I have not pinned it down exactly why, but I believe it has to be a combination of components that makes this happen. I used to be a TCXO, VCXO, Filter engineer back in the day, in 1980. To my surprise.and I mean often, it works good. Instant customer, for life. No other surge suppression company has this.but me. I have seen, a company that generally has these issues, have a turn over in employees and turn to ADI, and my sales dwindled, but bounce back real quick because the newbies get the message. This problem actually snuck up on me, I thought at first there is no solution, but I remember years ago there was another problem not quite unrelated to it so I made it a mandatory have this component in my surge suppression. ( added note: I just got a call on E3 Systems from FCI at a university where the end-user called with no solution in site, until he found my web.) I just happen to have a solution and I am not going to give away the secret. However I think it is big enough problem, and a problem experienced by many techs, they just don't know where to go. Normally my regulars who buy my products for fire alarms and normally install my surge suppression on the systems, have no clue this is a problem. This problem is not only restricted to EST, there has been many name brand panels that are afflicted with this problem, and the techs try in vain, with no solution. "Sweet" Rock and Roll, I say! Normally I do not write about it but EST did recommend them to me and I thought I better write something about this simple success story. Many end-users are calling me on this because the dealers have no clue what to do about it, and what they are using is not working.Ī couple of days ago, and YES! this has happened often before, an EST dealer called me about a radio being broadcast across his NAC circuit. I am re-posting this article because the issue of noise is getting worse.
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