25Power supplyThe power supply bay comes with two 600-W power supply modulesand can accommodate a third module for redundancy. The modulesconnect through the power distribution board (PDB) and auto-senseinput voltage. The power redundant (2+1) configuration allows you tohot-swap a failed power supply without interrupting normal systemoperation.Warning! The power supply in this product contains nouser-serviceable parts. There may be more than one powersupply in this product. Refer servicing only to qualifiedpersonnel.System fanCaution! All access covers must be on the system for propercooling.To ensure that all components remain within specification under allsystem environmental conditions, do not exceed five minutes for hotswapping of fans or power supplies.The server comes with four fan modules. Air enters through the bezel,passes through the fan bay and electronics bay, and exhausts throughthe rear of the chassis. The power supply modules and hot-swap harddrive bays also come with their own fans which draw air through thosecomponents and through the peripheral bays.Under normal system conditions, the fans run at a slower, quieterspeed. If a fan failure is sensed, a fan is not detected, or ambienttemperature exceeds a certain limit, the fan speed is set to high.LEDs indicate if individual fans are inoperative or not present. Underthe same fan failure conditions, the general system fault LED on thefront panel is lit.
