I work on FA systems for a living. Last week I had a job where I found 4 old horns bad on a NAC on a Silent Knight 5208. The wiring is old “zip” fire wire (both red, not red/black), and after replacing the first one on the circuit I went to another one. At this one, I found the voltage had dropped from the normal suvervisory voltage of about 6vdc to about 2vdc. I think I may have wired the outgoing wires wrong, and the incomming wires right (ie neg. out to the plus in and vise versa). Would this damage the other horns on the circuit? Would this damage the one that I replaced? Im going back in the morning. Please HELP ME NOW!!!
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May Have Wired A System Sensor P2r Horn/strobe Backwards. Would This Have Damaged It?
By WinPie Posted in: Uncategorized
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That’s hard to say. The issue here is whether of not you went from a negative to a positive. As its sound like you’ve got something acting as hub it is possible. The safest way would be to check the voltage coming from the hub points first. There is a chance that the new wiring has too much shielding that its causing problems. There is also the chance that this happened as a result of the zip wires too. My recommendation: if you have one of those handy along with a length of the new cable run a continuity test – through put voltage and see if there is any limits. There is the chance that what you are getting is a false positive due to the new wiring. Remember that as times change so does wiring grades and resistance.
good luck.