Huawei DBS3900 Installation Manual page 388

DBS3900 (Ver.B)
Installation Guide
2.
3.
4.
5.
Step 4 Tightly press the BBU against the wall with its back facing upwards, and then use a torque
wrench to tighten four M6x60 bolts on the wall-mounting ears for the BBU until the tightening
torque reaches 5 N·m, as shown in
Figure 11-7 Installing a BBU
----End
Issue 06 (2011-09-15)
WARNING
Take proper safety measures before drilling holes to protect your eyes and respiratory tract
against the dust.
Use a vacuum cleaner to clear the dust inside and around the holes. If the inter-hole spacing
is too wide or too narrow, locate and drill holes again.
Slightly tighten an expansion bolt, and then put the expansion bolt assembly into the hole
perpendicularly.
Use a rubber mallet to hammer the expansion bolt until the expansion tube is completely
buried in the hole.
Remove the M6x60 bolt, Nut, spring washer, and flat washer from each expansion bolt
assembly in sequence.
CAUTION
After dismantling an expansion bolt assembly, ensure that the top of the expansion tube is
on the same level as the wall. Otherwise, the BBU cannot be installed on the wall evenly
and securely.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
11 Indoor Scenario with DC Power Supply (BBU Installed
Figure 11-7.
on a Wall)
375