Huawei MTS9300A - 4.1.1 Cabinet; 4.1.2 AC and DC Power Distribution

No. Maintenance Item If... Then...
4 Check whether the
front and rear of
rectiers are blocked
or dusty.
The front or rear of
rectiers is blocked or
dusty.
Remove the blockage
or clean up the dust.
5 Whether there are
traces of animals such
as insects, mice, and
snakes inside the
cabinet
Animals entered the
cabinet.
1. Clear the traces and
take precautions
during clearance to
prevent secretions
of animals from
entering monitoring
boards or energized
components.
2. Seal the cable holes
to prevent animals
from entering the
cabinet again.
4.1.2 AC and DC Power Distribution
Table 4-2 AC and DC power distribution maintenance
No.
Maintenance Item If... Then...
3 Check for AC input
undervoltage.
● AC input power
cables have a large
voltage drop.
● AC input power
cables are in poor
contact.
● The mains voltage
is too low.
1. Replace AC input
power cables with
shorter or thicker
cables.
2. Connect AC input
power cables
securely.
3. Provide the voltage
data to the power
supplier.
4 Check for AC input
overvoltage.
The mains voltage is
too high.
Provide the voltage
data to the power
supplier.
5 Check whether the AC
input voltage is open-
phase.
● AC input power
cables are in poor
contact, short-
circuited, or
damaged.
● The mains supply
has failed.
1. Check and rectify
the cables.
2. Provide the open-
phase data to the
power supplier.
MTS9300A Telecom Power (Ooredoo, Indonesia,
MTS9304A-HD2002)
User Manual 4 Maintenance
Issue 06 (2021-10-13) Copyright © Huawei Technologies Co., Ltd. 43