AP7052DN&AP7152DN
Hardware Installation and Maintenance Guide
5 Appendix
Issue 01 (2017-12-29)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
124
Item
Requirements
and important buildings
Frequency of alternating
current
-4% to +4% of the rated value
Voltage wave shape sine
distortion
Within 5% of the rated voltage
The automated electric generator must have a standard interface that supports
telecommunication protocols, remote telecommunication, monitoring, and control.
AC power cables should meet the following specifications:
AC neutral should have a conductor with the same cross section as the phase line.
AC cables should have non-flammable insulation. The layout of AC cables should
comply with local regulations. Low-voltage power distribution rooms should comply
with local regulations.
5.2.2.2 Recommendations for AC Power Supply
The following are recommendations for the AC power supply.
If the voltage of the power mains that supply power directly to devices exceeds the rated
voltage by -10% to 5%, or exceeds the voltage range that devices can support, a voltage
regulating device or voltage stabilizing device is required.
If the mains do not supply power for the device directly, or if the mains voltage exceeds
the rated voltage by -15% to 10% or exceeds the input voltage range of the DC power
supply, a voltage regulating device or voltage stabilizing device is required.
A UPS or inverter power supply system is required to provide uninterrupted AC power to
support the telecommunication load.
If abnormalities occur on the mains, telecommunication servers should be equipped with
a self-supplied electric generator to support the key telecommunication load. The
capacity should be not less than 150% to 200% of the total uninterruptible power supply.
Storage batteries are usually installed in a parallel connection of two groups. UPS
storage batteries are generally installed in one group. The redundancy required for the
UPS can rely on concatenation or parallel connection. When an inverter or a UPS is used,
the active inverter is determined by the maximum power and a backup inverter is
required.
5.2.2.3 Requirements for DC Power Supply
The equipment room should receive stable and reliable DC power. Deploy the power
equipment near the telecommunications equipment to make the DC feeder as short as possible.
To reduce power consumption and installation cost, the loop voltage drop from the battery
port to the equipment port should be less than 3.2 V.
A large-scale enterprise can deploy an independent power supply system on each floor to
supply power to the telecommunications equipment room on the respective floor.
A medium-scale enterprise can use a power room and a battery room for centralized
power supply or use distributed power supply systems.