4.2 Replacing the AC/DC Power Equipment
The AC/DC power equipment is used in an AC cabinet, converting external 220 V AC input
power into -48 V DC power.
Prerequisite
l The tools and materials, such as an ESD wrist strap or ESD gloves, M3 screwdriver, and
M6 screwdriver, are ready.
l The quantities and types of module to be replaced are confirmed, and the new modules are
ready.
l The authorized personnel are permitted to enter the site. The required keys are available.
Context
l The AC/DC power equipment consists of the Power Distribution Unit (PDU), Power
Supply Unit (PSU), Power Monitoring Unit (PMU), and subrack. When a component of
the AC/DC power equipment is faulty, you only need to replace the faulty component.
When the entire AC/DC power equipment is faulty, you need to replace the AC/DC power
equipment.
l Figure 4-4 shows the position of the AC/DC power equipment in the cabinet.
Figure 4-4 Position of the AC/DC power equipment in the cabinet
1
(1) AC/DC power equipment
l Figure 4-5 shows the positions of the components in the AC/DC power equipment.
4 Replacing the Components in the OMB
BBU3900
Hardware Maintenance Guide
4-4 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 03 (2010-06-05)
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