Dell DAE2P Hardware Reference - Page 27

About DAE2P and DAE3P disk enclosures Drive modules are extremely sensitive electronic components. Refer to the instructions on "Handling FRUs" whenever you handle a disk module. Drive carrier The disk drive carriers are metal and plastic assemblies that provide smooth, reliable contact with the enclosure slot guides and midplane connectors. Each carrier has a handle with a latch and spring clips. The latch holds the disk module in place to ensure proper connection with the midplane. Disk drive Activity/Fault LEDs are integrated into the carrier. Power supply/system cooling modules The power supply/system cooling (power/cooling) modules are located above and below the LCCs. The units integrate independent power supply and dual-blower cooling assemblies into a single module. Each power supply is an auto-ranging, power-factor-corrected, multi-output, off-line converter with its own line cord. Each supply supports a fully configured DAE2P/DAE3P and shares load currents with the other supply. The drives and LCC have individual soft-start switches that protect the disk drives and LCCs if you install them while the disk enclosure is powered up. A FRU (disk, LCC, or power/cooling module) with power-related faults will not adversely affect the operation of any other FRU. The enclosure cooling system includes two dual-blower modules. If one blower fails, the others will speed up to compensate. If two blowers in a system (both in one power/cooling module, or one in each module) fail, the DAE2P/DAE3P will go off line within two minutes. Each power/cooling module has three visible status lights. The green LED indicates power to the supply; the center LED indicates a power supply fault. The remaining LED indicates a failure in one of the integrated blowers within that module. The status lights are shown in Figure 1-9 and described in "Monitoring disk enclosure status" in Chapter 3. Power supply/system cooling modules 1-11