Huawei DBS3900 Installation Manual page 391

DBS3900 (Ver.B)
Installation Guide
2.
3.
4.
5.
Step 4 Tightly press the DCDU-03B against the wall with the front panel facing the right and power
supply socket facing upwards, and then use a torque wrench to tighten four M6x60 bolts on the
wall-mounting ears for the DCDU-03B until the tightening torque reaches 5 N·m, as shown in
Figure
Figure 11-11 Installing a DCDU-03B
----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. Ensure that the bolt sticks out of the wall for 20 mm.
Remove the M6x60 bolt, 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 DCDU-03B cannot be installed on the wall
evenly and securely.
11-11.
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11 Indoor Scenario with DC Power Supply (BBU Installed
on a Wall)
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