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.

Issue 03 (2018-05-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
i
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
Issue 03 (2018-05-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
ii
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)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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
Issue 03 (2018-05-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
iv
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

ACBox 12-In 1-Out AC Combiner Box
User Manual
Contents
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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

ACBox 12-In 1-Out AC Combiner Box
User Manual
1 Safety Precautions
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Copyright © Huawei Technologies Co., Ltd.
1
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.

ACBox 12-In 1-Out AC Combiner Box
User Manual
1 Safety Precautions
Issue 03 (2018-05-15)
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Copyright © Huawei Technologies Co., Ltd.
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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

ACBox 12-In 1-Out AC Combiner Box
User Manual
1 Safety Precautions
Issue 03 (2018-05-15)
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Copyright © Huawei Technologies Co., Ltd.
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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.

ACBox 12-In 1-Out AC Combiner Box
User Manual
2 Overview
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Copyright © Huawei Technologies Co., Ltd.
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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.