Power for the CBA1048 1RU Fan Tray comes from either one or two Rectifier Modules in a Rectifier Shelf installed at the top of the Wall-Mount Swing Rack (all optional), or from existing –48-VDC power in the room. When using dual DC power sources, if one source should fail, the CBA1048 Fan Tray switches over to the alternate source. A cable assembly (optional) connects –48-VDC power from one or two DC sources to the CBA1048 card cage and the Fan Tray. It also connects the Fan Tray alarm output to the CBA1048 backplane fan alarm input.
Temperature and Fan Control
The internal controller board adjusts the speed of the fans based on the ambient air temperature flowing into the fan intakes, and sends an alarm signal to the CBA1048 card cage backplane PCB if a fan should fail.