Huawei ACBox Series User manual

ACBox 12-In 1-Out AC Combiner Box
User Manual
Issue
03
Date
2018-05-15
HUAWEI TECHNOLOGIES CO., LTD.

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Copyright © Huawei Technologies Co., Ltd. 2018. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior
written consent of Huawei Technologies Co., Ltd.
Trademarks and Permissions
and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
The purchased products, services and features are stipulated by the contract made between Huawei and
the customer. All or part of the products, services and features described in this document may not be
within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements,
information, and recommendations in this document are provided "AS IS" without warranties, guarantees or
representations of any kind, either express or implied.
The information in this document is subject to change without notice. Every effort has been made in the
preparation of this document to ensure accuracy of the contents, but all statements, information, and
recommendations in this document do not constitute a warranty of any kind, express or implied.
Huawei Technologies Co., Ltd.
Address:
Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Website:
http://e.huawei.com

ACBox 12-In 1-Out AC Combiner Box
User Manual
About This Document
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About This Document
Purpose
This document describes theACBox-12/1-JP (ACBox for short) in terms of its installation,
electrical connections, commissioning, maintenance, and troubleshooting. Before installing
and operating theACBox, ensure that you are familiar with the features, functions, and safety
precautions provided in this document.
Intended Audience
This document is intended for operators of the grid-tied photovoltaic (PV) power system and
electrical technicians.
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol
Description
Indicates an imminently hazardous situation which, if not
avoided, will result in serious injury or death.
Indicates a potentially hazardous situation which, if not
avoided, could result in serious injury or death.
Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
Indicates a potentially hazardous situation which, if not
avoided, could result in equipment damage, data loss,
performance deterioration, or unanticipated results.
NOTICE is used to address practices not related to personal
injury.
Calls attention to important information, best practices and
tips.
NOTE is used to address information not related to personal
injury, equipment damage, and environment deterioration.

ACBox 12-In 1-Out AC Combiner Box
User Manual
About This Document
Issue 03 (2018-05-15)
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iii
Change History
Changes between document issues are cumulative. The latest document issue contains all
updates made in previous issues.
Issue 03 (2018-05-15)
Updated 5.4 Opening the Enclosure Door.
Issue 02 (2018-02-12)
Updated 5.1 Cable Specifications.
Issue 01 (2017-10-16)
This issue is used for first office application (FOA).

ACBox 12-In 1-Out AC Combiner Box
User Manual
Contents
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Contents
About This Document.................................................................................................................... ii
1 Safety Precautions.........................................................................................................................1
2 Overview.........................................................................................................................................4
2.1 Introduction ..................................................................................................................................................................4
2.2 Appearance ...................................................................................................................................................................5
2.3 Label Description..........................................................................................................................................................7
2.4 Working Principles........................................................................................................................................................9
3 Storage...........................................................................................................................................10
4 Installation....................................................................................................................................11
4.1 Checking Before Installation ...................................................................................................................................... 11
4.2 Tools and Instruments................................................................................................................................................. 11
4.3 Determining the Installation Position .........................................................................................................................13
4.4 Installing the Mounting Bracket .................................................................................................................................14
4.4.1 Wall-mounted Installation........................................................................................................................................15
4.4.2 Support-mounted Installation ..................................................................................................................................17
4.4.3 Pole-mounted Installation........................................................................................................................................19
4.5 Installing the ACBox ..................................................................................................................................................20
5 Electrical Connections................................................................................................................23
5.1 Cable Specifications ...................................................................................................................................................23
5.2 Crimping the OT Terminal..........................................................................................................................................24
5.3 Knocking Off Barrier Chips from Cable Holes ..........................................................................................................25
5.4 Opening the Enclosure Door.......................................................................................................................................26
5.5 Installing the PE Cable ...............................................................................................................................................28
5.6 Installing the AC Input Power Cable ..........................................................................................................................29
5.7 Installing the AC Output Power Cable........................................................................................................................31
6 Operation ......................................................................................................................................33
6.1 Checking Before Power-On........................................................................................................................................33
6.2 Installing the Cover.....................................................................................................................................................33
6.3 Powering On the System.............................................................................................................................................34
6.4 Powering Off the System............................................................................................................................................34

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User Manual
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6.5 Closing the Enclosure Door........................................................................................................................................35
7 Maintenance.................................................................................................................................36
7.1 Routine Maintenance..................................................................................................................................................36
7.2 Parts Replacement ......................................................................................................................................................37
7.2.1 Replacing the AC Input Circuit Breaker..................................................................................................................37
7.2.2 Replacing the AC Output Circuit Breaker ...............................................................................................................38
7.2.3 Replacing the Power SPD........................................................................................................................................39
8 Technical Specifications ............................................................................................................41
A Acronyms and Abbreviations..................................................................................................42

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User Manual
1 Safety Precautions
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1 Safety Precautions
General Safety
Personnel who plan to install or maintain Huawei equipment must receive a thorough training,
understand all necessary safety precautions, and be able to correctly perform all operations.
Only certified personnel are allowed to remove safety facilities and inspect the
equipment.
Only personnel certified or authorized by Huawei are allowed to replace devices or
components (including software).
Any fault or error that might cause safety problems must be reported immediately to a
supervisor.
Read this document thoroughly before operations. Huawei shall not be liable for any device
damage caused by violation of the storage, transportation, installation, and operation
regulations specified in this document.
The safety precautions provided in this document do not cover all the safety precautions.
Huawei shall not be liable for any consequence caused by the violation of the safety operation
regulations and design, production, and usage standards.
Local Laws and Regulations
Follow local laws and regulations when operating equipment. The safety instructions in this
document are only supplements to local laws and regulations.
Grounding
Equipment to be grounded must meet the following requirements:
When installing equipment, connect the protective earthing (PE) cable first. When
removing equipment, disconnect the PE cable last.
Do not damage the ground conductor.
Do not operate equipment in the absence of a properly installed ground conductor.

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User Manual
1 Safety Precautions
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Equipment must be connected permanently to the PE point before an operation.
Before operating equipment, check the electrical connection of the equipment to ensure
that it is securely grounded.
Personal Safety
To avoid electric shocks, ensure thatAC INPUT andAC OUTPUT connections are not
reversed.
Before operating equipment, remove any conductors such as jewelry and watches to
avoid electric shock or burns.
For personal safety during operation and maintenance, insulation gloves and safety shoes
must be put on.
Use tools in correct methods to avoid hurting people or damaging devices.
In the case of a fire, immediately leave the building or the equipment area, and turn on
the fire alarm bell or make an emergency call. Never enter the building on fire in any
case.
When the operation is performed in a damp environment, ensure that the equipment is
dry. When water is found in the cabinet or the cabinet is damp, switch off the power
supply immediately.
Equipment Security
Before operation, ensure that the equipment is firmly anchored to the floor or other solid
objects, such as a wall or an installation rack.
Use a tool to tighten screws when installing components.
After the installation, remove the packing materials from the equipment area.
High voltage
High-voltage power is supplied to equipment. Direct contact with the high-voltage power
or indirect contact through damp objects is fatal.
Non-standard and improper operations will result in fire or electric shocks.
The installation and operation of high-voltage AC equipment must be performed only by
certified personnel.
Comply with local laws and regulations when bridging and routingAC cables.
When operating AC equipment, follow local laws and regulations.
Use dedicated tools when performing high voltage andAC operations.
Put on insulation gloves before powering on or off cabinets.
Power Cables

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User Manual
1 Safety Precautions
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Do not connect or disconnect power cables under power. Transient contact between the core
wire of a power cable and the conductor will generate electric arcs or sparks, which may
cause fire or personal injury.
Before installing or removing a power cable, turn off the upstream power switch, and use
a multimeter to check that the AC voltage of the input port is zero.
Before connecting a power cable, check that the label on the power cable is correct.
Do not connect a single-phaseAC power cable reversely. Otherwise, equipment may be
damaged.
Component
To ensure the safe operation of equipment, replace a faulty component with a component of
the same type and specifications.

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User Manual
2 Overview
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2 Overview
2.1 Introduction
Function
The ACBox combines the AC outputs from single-phase string inverters. The ACBox works
with Huawei SUN2000L and combines the outputs from the following types of SUN2000Ls:
Up to 12 SUN2000L-4.125KTL-JP units
Up to 10 SUN2000L-4.95KTL-JP units
The SUN2000L-4.125KTL-JP and SUN2000L-4.95KTL-JP are both abbreviated as SUN2000L in the
following text.
Models
Figure 2-1 shows the designation explanation of theACBox.
Figure 2-1 Designation explanation
System Application
The ACBox applies to a low-voltage single-phase three-wire grid-tied PV system that
typically consists of PV strings, grid-tied inverters, andAC combiner boxes. Figure 2-2 shows
the position of the ACBox in a low-voltage single-phase three-wire grid-tied PV system.

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User Manual
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Figure 2-2 System application
(A) PV string
(B) SUN2000L
(C) ACBox
(D) Low-voltage power grid
2.2 Appearance
Dimensions
Figure 2-3 Dimensions

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Front View
Figure 2-4 Front view
(1) Enclosure door
(2) Enclosure door lock
Rear view
Figure 2-5 Rear view
(1) Mounting plate

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Bottom view
Figure 2-6 Bottom view
Table 2-1 Bottom description
No.
Component Name
Silk Screen
Description
1
Cable hole for the AC
output power cable
AC OUTPUT
Connects to the AC output
power cable.
Inner diameter: 76 mm
2
Cable hole 1 for the
AC input power cable
AC INPUT1
Connects to the AC input
power cable.
Inner diameter: 76 mm
3
PE point
N/A
N/A
4
Ventilation valve
N/A
N/A
5
Cable hole 2 for the
AC input power cable
AC INPUT2
Connects to the AC input
power cable.
Inner diameter: 76 mm
2.3 Label Description
Enclosure Labels
Table 2-2 describes the labels on theACBox enclosure.
Table 2-2 Enclosure label description
Label
Name
Meaning
Electric shock
High voltage exists after the ACBox
is powered on. Only certified
electricians may install and operate
the ACBox.

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Label
Name
Meaning
Grounding
Indicates the position for connecting
the PE cable.
Operation warning
Before removing the ACBox cover,
disconnect all AC power supplies.
Weight label
The ACBox is heavy and needs to be
carried by more than one person.
Nameplate
The ACBox is labeled with a nameplate on the side that contains the model information,
technical specifications, and compliance symbols, as shown in Figure 2-7.
Figure 2-7 Nameplate
(1) Trademark, product name, and model
number
(2) Important technical specifications
(3) Compliance symbols
(4) Company name and country of
manufacture
The nameplate figure is for reference only.
Table 2-3 Compliance label description
Label
Name
Meaning
Environmentally friendly use
period (EFUP)
This product is environmentally
friendly for at least 50 years.

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Label
Name
Meaning
European Union (EU) waste
electrical and electronic
equipment (WEEE)
This product must not be disposed of
as domestic waste.
2.4 Working Principles
The ACBox works with Huawei SUN2000L. It combines the outputs from up to 12
SUN2000L-4.125KTL-JP units or 10 SUN2000L-4.95KTL-JP units and provides surge
protection and overcurrent protection.
Figure 2-8 shows the ACBox working principles by using the access from 12
SUN2000L-4.125KTL-JP units as an example.
Figure 2-8 Working principles

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3 Storage
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3 Storage
The following requirements should be met when theACBox needs to be stored prior to
installation:
Do not unpack theACBox.
Keep the storage temperature at –30°C to +70°C and the humidity at 5%–95% RH.
The ACBox should be stored in a clean and dry place and be protected from dust and
water vapor corrosion.
A maximum of threeACBoxes can be stacked.
Regular inspection is required during the storage. Replace the packing materials when
necessary.
After long-term storage, an inspection and test conducted by qualified persons are
necessary before theACBox is put into use.

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4 Installation
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4 Installation
4.1 Checking Before Installation
Outer Packing Materials
Before unpacking theACBox, check the outer packing materials for damage, such as holes
and cracks. If any damage is found, do not unpack theACBox and contact the dealer
immediately.
You are advised to remove the outer packaging within 24 hours before installing the ACBox.
Package Contents
After unpacking theACBox, check that the contents are intact and complete. If any damage is
found or any component is missing, contact your dealer.
For details about the number of contents, see the Packing List in the packing case.
4.2 Tools and Instruments
Type
Tools and Instruments
Installati
on tools
Hammer drill (drill bit: Ф14
mm and Ф16 mm)
Socket wrench
Torque wrench

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Type
Tools and Instruments
Torque screwdriver
Wire stripper
Diagonal pliers
Rubber mallet
Utility knife
Cable cutter
Hydraulic pliers
Crimping tool
Heat shrink tubing
Heat gun
Multimeter
Vacuum cleaner
Measuring tape
Bubble or digital level
Marker
Cable tie
N/A
N/A

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Type
Tools and Instruments
PPE
Safety goggles
Anti-dust respirator
Safety gloves
Safety shoes
N/A
N/A
4.3 Determining the Installation Position
Basic Requirements
The ACBox is protected to IP65 and can be installed indoors or outdoors.
Do not install theACBox in areas with flammable or explosive materials.
Installation Environment Requirements
The ACBox must be installed in a well-ventilated environment to ensure good heat dissipation,
so that theACBox can operate in the temperature range of –20°C to +50°C.
Mounting Structure Requirements
The mounting structure where the ACBox is installed must be fireproof.
Do not install the ACBox on flammable building materials.
The ACBox weighs 46 kg. Ensure that the installation surface is solid enough to bear the
weight load.
Installation Space Requirements
The ACBox enclosure dimensions (W x H x D) are 780 mm x 815 mm x 225 mm. The
ACBox can be mounted on a wall, pole, or support. Reserve sufficient space around the
ACBox to facilitate installation and cable connection.

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Figure 4-1 Installation space
4.4 Installing the Mounting Bracket
Figure 4-2 shows the ACBox mounting bracket dimensions.
Figure 4-2 Mounting bracket dimensions
The ACBox mounting bracket has four groups of tapped holes, each group containing four tapped holes.
Mark any hole in each group based on site requirements and mark four holes in total. Two round holes
are preferred.