Huawei NE05E Hardware Manual page 402

HUAWEI NE05E,NE08E
Hardware Guide
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router equipment also has critical restriction on random transient noises, which
include the abnormal operation noise of the equipment caused by external
magnetic interference and the interference from the equipment itself and the
ground cables. The shorter the duration of the transient pulse, the larger values of
such transient noises can be allowed. For the allowable values, see
Figure 4-3 Transient noises
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Issue 05 (2023-03-31)
and a certain margin should be reserved. Generally, high frequency switching
power supplies with a high switching efficiency should be adopted, which
should work in N+1 hot standby mode. There should be an output current
equalizer for each power module. The failure of a single power module will
not affect the normal operation of the whole DC power distribution system.
Each control panel can access a minimum of two groups of storage batteries.
When one of them fails, the other can supply power instead.
Each control panel can access a minimum of 5 primary power supplies.
The power supply equipment should be capable of automation, so as to
satisfy the non-attendant requirement.
When the primary power supply charges the storage batteries in floating
charge mode, the number of primary power supplies put into operation
depends on the load. When one primary power supply becomes faulty, it will
drop out automatically, while the standby primary power supply will
automatically go into operation.
In the case of mains outage, storage batteries will discharge. When the mains
resumes, it will automatically recharge the discharged storage batteries with a
current 0.1 to 0.15 times of the battery capacity. When the charging voltage
reaches 56.4 V, it will automatically change to constant-voltage charging.
When the storage batteries are fully charged, they will automatically change
to floating charge.
When the power supply equipment fails or works abnormally, visual and
audible alarms should be given. Such alarm information should be sent to the
operation and maintenance center.
In case short circuit occurs in a tributary of the power supply system, the
whole power distribution system should not be affected by the sharp voltage
reduction.
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4 Hardware Installation and Parts Replacement
Figure 4-3.
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