| 摘要 |
A power sub-system controls the supply of power to a field replaceable unit. The power sub-system includes a main power controller that supplies main power to at least a first component of the field replaceable unit, and a standby power controller that supplies standby power to at least a second component of the field replaceable unit. The main power controller is operable to switch off the supply of main power to a first component in response to the detection of a fault, whereas the standby power controller maintains the supply of standby power to the second component. By providing separates power controllers for main and standby power, it is possible to maintain power to one or more selected components of the FRU in the event of a fault that requires main power to the FRU to be cut. Standby power is switched off automatically in response to a first change in state of an interlock signal that is indicative of the field replaceable unit being released. Standby power is switched on automatically in response to a subsequent, second, change in state of an interlock signal indicative of the field replaceable unit being replaced. In this manner, standby power is cut automatically when a service engineer releases the FRU for removal and is restored automatically when the FRU is secured following replacement.
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