Mini sounders buzz

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oldtimer
Posts: 5
Joined: Mon Jun 13, 2016 4:10 pm

Mini sounders buzz

Post by oldtimer »

Hi all , I have a 9200udls with fcps and 5 nacs in an apartment building and are getting complaints of a hum or buzz from some mini sounders from the fire panel Nac , if I move circuit to a fcps sound seems to go away , what ever Nac I put on panel you seem to get buzz .

Thought about putting a choke on that circuit , any thoughts of cause , I checked AC voltage and pick up about .5 volts off nac
Leo
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Posts: 889
Joined: Thu Dec 11, 2008 7:52 am

Re: Mini sounders buzz

Post by Leo »

trying to get it clear
the NAC panel is humming?
NAC panels do not have buzzers
I have seen the transformer inside the panel hum, in these cases the transform is just bad.
disconnect the AC and run on batteries, see what happens
do not put a choke on a NAC circuit.
remove all power and check for AC volts.
.5 AC volts is not going to do anything

-- I bet it is the transformer
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