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PAC2000S12-B1 PSU
Figure 7-2 Fan power supply circuit
Fan Protection
1.
When PSUs work in parallel, if a fan and its power supply circuits are short-circuited or open-
circuited, the 12 V/6 V power of the system backplane cannot exceed the normal dynamic
voltage change limit (the output voltage of the MV12 is greater than 11.4 V, and the time when
the MV12 is lower than 11.4 V is less than 100 μs; the MV6 output voltage is greater than 6 V).
The normal operation of the system is not affected.
2.
When the fan fault detection board detects a fan or fan circuit fault and the fault lasts for over
20s, it reports a fault.
NO TE
Long-time fan operation ages the internal bearing, which prolongs fan startup time. The fan is considered
to be faulty only when it does not reach the specified rotational speed after more than 10s.)
3.
The fan fault can be rectified.
Technical Manual
7 Internal Cooling Fan
30
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