Hello! First time poster here. I have a question regarding the battery charging circuit. Mechanical siren with T/R, and battery backup (4 12vdc = 48vdc) The sirens in question mainly have the newest single point charger, but I believe the issue would follow to the older style 4 12 volt chargers. Per what is in the field and what is in the manual, the charger wire comes out of the charger to a terminal strip. From the terminal strip it lands on the 48vdc backup battery cable on the T/R contactor. It ALSO lands on the control boards "48volt supply and sense" input. So, after some experimenting I have found that you could have 1 or 4 batteries bad, up to and including 1 or more exploded, and STILL be getting 48-52 charger volts to the control board, which in turn would never trigger the "battery fail" back to the Commander software at the base station. (we are using the commander software on a computer to interact with our sirens.). Federal signal says to program the 3rd T/R relay to force the system to batteries for a monthly test, which will exercise the batteries, HOWEVER it will not allow the "battery fail" sensor to detect the batteries dropping below the trigger voltage because it is ALWAYS seeing the 48-52 volts from the charger. As far as I can tell the only way you could do a test and actually see if the batteries dropped below the trigger voltage would be to turn the AC power off to the actual battery charger itself during the test. Has anyone else seen this, or know something I am missing here.
Thanks