HP 6100 HP 4x00/6x00/8x00 Enterprise Virtual Array User Guide (5697-0733, Marc - Page 32
Blowers, Drive enclosure EMU
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The output of each power supply is 499 W, with a peak output of 681 W. A single power supply can support an enclosure with a full complement of disks. The power supply circuitry provides protection against: • Overloads • Short circuits • Overheating Power supply status and diagnostic information is reported to the EMU with voltage, current, and temperature signals. See "Regulatory notices and specifications" (page 110) for the enclosure power specifications. The power supply temperature sensor provides a temperature range signal to the EMU, which uses this signal to set the blower speed. The power supply internal temperature can also control the speed of the blower. The higher the power supply temperature, the faster the speed of the blower. If the power supply temperature exceeds a preset value, the power supply automatically shuts down. Blowers The power supply-mounted blowers cool the enclosure by circulating air through the enclosure. The blowers, under the control of the EMU or the associated power supply, can operate at multiple speeds. This ensures that, when the enclosure temperature changes, the blowers can automatically adjust the air flow. If a blower is operating too slowly or has stopped (a "blower failure"), internal circuitry automatically operates the remaining blower at a higher speed. Simultaneously, the error condition is reported in several ways, including the power supply indicator, the audible alarm, the enclosure fault indicators, and the EMU alphanumeric display. Should both blowers fail, the power supplies automatically shut down. NOTE: The blowers are field-replaceable units and can be replaced, individually, while the system is running. The blowers are also interchangeable. The failure of a power supply +12.5 VDC circuit disables the associated blower. The status indicator on the blower displays the status of both the power supply and the blower. See Figure 12 (page 31). See Table 7 (page 32) for definitions of the indicator displays. Table 7 Power supply/blower status indicators Blower status indicator On Flashing Off Description Both the power supply and the blower are operational. The power supply or the blower locate function is active. The power supply or the blower is non-operational. When there is a blower problem, the other blower runs at a higher speed. Recommended corrective actions: • Check blower for proper operation. Replace if defective. • Check power supplies for proper operation. Replace if defective. Drive enclosure EMU The EMU provides increased protection against catastrophic failures. The EMU detects conditions such as failed power supplies, failed blowers, elevated temperatures, and external air sense faults and communicates these conditions to the storage system controllers. 32 Enterprise Virtual Array hardware components