Compaq System/E25 User's Guide download pdf (Page 22)

22 Product Description

Power supplies share the load reciprocally; that is, each supply automatically

increases its output to compensate for reduced output from the other, and vice

versa. If one power supply fails, the other delivers the entire load.

Internal circuitry triggers a fault when the internal fan or other part fails. At the

same time, the power fault LED (amber) illuminates, and, if enabled, the

hardware event monitor sends an event message. The power supply fan remains

on if other parts fail in order to maintain cooling air flow through the system. If

the fan fails, the power supply shuts down. The fan in the other working power

supply will increase to full speed to compensate for the failed fan. The failed

power supply/fan module must be removed and the replacement power supply/

fan module installed within two minutes. In the event of a failure, if a

replacement fan module/power supply is not available, leave the failed power

supply/fan module installed until you are ready to replace it. This should be done

to maintain proper cooling for the disk system.

Internal circuitry senses fan motion and triggers a fault when the speed of the

power supply’s internal fan falls below a critical level. At the same time, the LED

turns amber, and, if enabled, the hardware event monitor sends an event message.

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Compaq System/E25 User's Guide Page 22