| Hot-Plug & Hot-Swap Fans |  |
| All UltraFlo® hot-swap fans are hot-pluggable, but not all hot-plug fans should be hot swapped. The key to hot-swap capability is limiting the amplitude of a cooling fan's in-rush current as it is connected to a system under power. Fans without hot-plug connectivity safely engage a system's power and signal buses only under power-down conditions or by using a connector that has long, first-make/last-break ground pins. Uncontrolled connection of a non-hot-plug fan to a powered-up system can damage the fan and its host by routing large reverse current surges (three to 10 times normal operating levels) through unprotected control and signal leads. <More> |
| Hot-Plug & Hot-Swap Fans |  |
A hot-plug fan can be directly connected to a powered system without damage to itself or its host. No special connector is needed. Reverse currents are prevented by series diodes in the fan's signal circuits and by high impedance values in its control circuits, but large start-up surges still threaten system stability. <Back> <More> |
| Hot-Plug & Hot-Swap Fans |  |
Hot-swap fans limit in-rush current to a peak value that is less than the maximum operating current of the fan, and impose an internal power-up delay (typically 100 ms) to prevent contact bounce. <Back> <More> |
| Hot-Plug & Hot-Swap Fans |  |
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All standard UltraFlo models with ball bearings are rated for hot-plug operation. NBRX sleeve-bearing designs generally require use of a connector with a long ground pin (first-make/last-break) for application in hot-plug service. |
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Applications > Hot-Plug/Hot-Swap Cooling Fans
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