Huawei EMMA-A01 User manual

EMMA-(A01, A02)
User Manual
Issue 01
Date 2023-09-15
HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Copyright © Huawei Digital Power Technologies Co., Ltd. 2023. 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 Digital Power Technologies Co., Ltd.
Trademarks and Permissions
and other Huawei trademarks are the property 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
Digital Power Technologies Co., Ltd. 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
specied 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 eort 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 Digital Power Technologies Co., Ltd.
Address: Huawei Digital Power Antuoshan Headquarters
Futian, Shenzhen 518043
People's Republic of China
Website: https://e.huawei.com
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. i

About This Document
Purpose
This document describes the EMMA-A01 and EMMA-A02 (EMMA for short) in
terms of safety precautions, product introduction, installation, electrical
connections, power-on and commissioning, maintenance, and technical data. Read
this document carefully before installing and using the EMMA.
Intended Audience
This document is intended for:
● Technical support engineers
● Hardware installation engineers
● Commissioning engineers
● Maintenance engineers
Symbol Conventions
The symbols that may be found in this manual are dened as follows.
Symbol Description
Indicates a hazard with a high level of risk which, if not
avoided, will result in death or serious injury.
Indicates a hazard with a medium level of risk which, if not
avoided, could result in death or serious injury.
Indicates a hazard with a low level of risk which, if not
avoided, could 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.
EMMA-(A01, A02)
User Manual About This Document
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. ii

Symbol Description
Supplements the important information in the main text.
NOTE is used to address information not related to personal
injury, equipment damage, and environment deterioration.
Change History
Issue Release Date Description
01 2023-09-15 This issue is the rst ocial release.
EMMA-(A01, A02)
User Manual About This Document
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. iii

Contents
About This Document................................................................................................................ ii
1 Safety Information.................................................................................................................. 1
1.1 Personal Safety.........................................................................................................................................................................2
1.2 Electrical Safety........................................................................................................................................................................4
1.3 Environment Requirements................................................................................................................................................. 6
1.4 Mechanical Safety................................................................................................................................................................... 8
2 Product Description.............................................................................................................. 12
2.1 Model Description................................................................................................................................................................ 12
2.2 Networking............................................................................................................................................................................. 12
2.3 Appearance............................................................................................................................................................................. 14
2.4 Label Description.................................................................................................................................................................. 16
3 Storage Requirements..........................................................................................................18
4 Installation..............................................................................................................................19
4.1 Installation Requirements.................................................................................................................................................. 19
4.2 Preparing Tools...................................................................................................................................................................... 19
4.3 Checking Before the Installation..................................................................................................................................... 21
4.4 Installing the EMMA............................................................................................................................................................ 21
5 Electrical Connections.......................................................................................................... 23
5.1 Preparing Cables................................................................................................................................................................... 24
5.2 Connecting the AC Power Cable or External CT Cable............................................................................................ 27
5.3 Connecting RS485 Communications Cables, DO Signal Cables, and 12 V Output Cables..........................33
5.4 Installing FE Communications Cables............................................................................................................................36
5.5 (Optional) Installing External WLAN Antennas......................................................................................................... 37
6 Power-On and Commissioning........................................................................................... 38
6.1 Check Before Power-On...................................................................................................................................................... 38
6.2 Powering On the EMMA.................................................................................................................................................... 39
6.3 Commissioning the EMMA................................................................................................................................................ 40
6.3.1 Deploying a New Plant....................................................................................................................................................41
6.3.2 Commissioning Functions............................................................................................................................................... 42
7 Maintenance...........................................................................................................................44
EMMA-(A01, A02)
User Manual Contents
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. iv

7.1 Routine Maintenance.......................................................................................................................................................... 44
7.2 Alarm Reference.................................................................................................................................................................... 45
8 Technical Specications....................................................................................................... 49
A Resetting Passwords.............................................................................................................51
B Certicate Management and Maintenance....................................................................52
B.1 Precongured Certicate Risk Disclaimer.................................................................................................................... 52
B.2 Application Scenarios of Precongured Certicates................................................................................................. 53
C Contact Information............................................................................................................. 54
D Intelligent Customer Service..............................................................................................56
E Acronyms and Abbreviations..............................................................................................57
EMMA-(A01, A02)
User Manual Contents
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. v

1 Safety Information
Statement
Before transporting, storing, installing, operating, using, and/or maintaining
the equipment, read this document, strictly follow the instructions provided
herein, and follow all the safety instructions on the equipment and in this
document. In this document, "equipment" refers to the products, software,
components, spare parts, and/or services related to this document; "the Company"
refers to the manufacturer (producer), seller, and/or service provider of the
equipment; "you" refers to the entity that transports, stores, installs, operates,
uses, and/or maintains the equipment.
The Danger, Warning, Caution, and Notice statements described in this
document do not cover all the safety precautions. You also need to comply with
relevant international, national, or regional standards and industry practices. The
Company shall not be liable for any consequences that may arise due to
violations of safety requirements or safety standards concerning the design,
production, and usage of the equipment.
The equipment shall be used in an environment that meets the design
specications. Otherwise, the equipment may be faulty, malfunctioning, or
damaged, which is not covered under the warranty. The Company shall not be
liable for any property loss, personal injury, or even death caused thereby.
Comply with applicable laws, regulations, standards, and specications during
transportation, storage, installation, operation, use, and maintenance.
Do not perform reverse engineering, decompilation, disassembly, adaptation,
implantation, or other derivative operations on the equipment software. Do not
study the internal implementation logic of the equipment, obtain the source code
of the equipment software, violate intellectual property rights, or disclose any of
the performance test results of the equipment software.
The Company shall not be liable for any of the following circumstances or
their consequences:
● The equipment is damaged due to force majeure such as earthquakes, oods,
volcanic eruptions, debris ows, lightning strikes, res, wars, armed conicts,
typhoons, hurricanes, tornadoes, and other extreme weather conditions.
● The equipment is operated beyond the conditions specied in this document.
EMMA-(A01, A02)
User Manual 1 Safety Information
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 1

● The equipment is installed or used in environments that do not comply with
international, national, or regional standards.
● The equipment is installed or used by unqualied personnel.
● You fail to follow the operation instructions and safety precautions on the
product and in the document.
● You remove or modify the product or modify the software code without
authorization.
● You or a third party authorized by you cause the equipment damage during
transportation.
● The equipment is damaged due to storage conditions that do not meet the
requirements specied in the product document.
● You fail to prepare materials and tools that comply with local laws,
regulations, and related standards.
● The equipment is damaged due to your or a third party's negligence,
intentional breach, gross negligence, or improper operations, or other reasons
not related to the Company.
1.1 Personal Safety
D ANGER
Ensure that power is o during installation. Do not install or remove a cable with
power on. Transient contact between the core of the cable and the conductor will
generate electric arcs or sparks, which may cause a re or personal injury.
D ANGER
Non-standard and improper operations on the energized equipment may cause
re, electric shocks, or explosion, resulting in property damage, personal injury, or
even death.
D ANGER
Before operations, remove conductive objects such as watches, bracelets, bangles,
rings, and necklaces to prevent electric shocks.
D ANGER
During operations, use dedicated insulated tools to prevent electric shocks or short
circuits. The dielectric withstanding voltage level must comply with local laws,
regulations, standards, and specications.
EMMA-(A01, A02)
User Manual 1 Safety Information
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 2

WARNING
During operations, wear personal protective equipment such as protective
clothing, insulated shoes, goggles, safety helmets, and insulated gloves.
Figure 1-1 Personal protective equipment
General Requirements
● Do not stop protective devices. Pay attention to the warnings, cautions, and
related precautionary measures in this document and on the equipment.
● If there is a likelihood of personal injury or equipment damage during
operations, immediately stop, report the case to the supervisor, and take
feasible protective measures.
● Do not power on the equipment before it is installed or conrmed by
professionals.
● Do not touch the power supply equipment directly or with conductors such as
damp objects. Before touching any conductor surface or terminal, measure
the voltage at the contact point to ensure that there is no risk of electric
shock.
● Do not touch operating equipment because the enclosure is hot.
● Do not touch a running fan with your hands, components, screws, tools, or
boards. Otherwise, personal injury or equipment damage may occur.
● In the case of a re, immediately leave the building or the equipment area
and activate the re alarm or call emergency services. Do not enter the
aected building or equipment area under any circumstances.
Personnel Requirements
● Only professionals and trained personnel are allowed to operate the
equipment.
– Professionals: personnel who are familiar with the working principles and
structure of the equipment, trained or experienced in equipment
operations and are clear of the sources and degree of various potential
hazards in equipment installation, operation, maintenance
EMMA-(A01, A02)
User Manual 1 Safety Information
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 3

– Trained personnel: personnel who are trained in technology and safety,
have required experience, are aware of possible hazards on themselves in
certain operations, and are able to take protective measures to minimize
the hazards on themselves and other people
● Personnel who plan to install or maintain the equipment must receive
adequate training, be able to correctly perform all operations, and understand
all necessary safety precautions and local relevant standards.
● Only qualied professionals or trained personnel are allowed to install,
operate, and maintain the equipment.
● Only qualied professionals are allowed to remove safety facilities and inspect
the equipment.
● Personnel who will perform special tasks such as electrical operations,
working at heights, and operations of special equipment must possess the
required local qualications.
● Only authorized professionals are allowed to replace the equipment or
components (including software).
● Only personnel who need to work on the equipment are allowed to access
the equipment.
1.2 Electrical Safety
D ANGER
Before connecting cables, ensure that the equipment is intact. Otherwise, electric
shocks or re may occur.
D ANGER
Non-standard and improper operations may result in re or electric shocks.
D ANGER
Prevent foreign matter from entering the equipment during operations. Otherwise,
equipment damage, load power derating, power failure, or personal injury may
occur.
CA UTION
Do not route cables near the air intake or exhaust vents of the equipment.
EMMA-(A01, A02)
User Manual 1 Safety Information
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 4

General Requirements
● Follow the procedures described in the document for installation, operation,
and maintenance. Do not reconstruct or alter the equipment, add
components, or change the installation sequence without permission.
● Obtain approval from the national or local electric utility company before
connecting the equipment to the grid.
● Observe the power plant safety regulations, such as the operation and work
ticket mechanisms.
● Install temporary fences or warning ropes and hang "No Entry" signs around
the operation area to keep unauthorized personnel away from the area.
● Before installing or removing power cables, turn o the switches of the
equipment and its upstream and downstream switches.
● Before performing operations on the equipment, check that all tools meet the
requirements and record the tools. After the operations are complete, collect
all of the tools to prevent them from being left inside the equipment.
● Before installing power cables, check that cable labels are correct and cable
terminals are insulated.
● When installing the equipment, use a torque tool of a proper measurement
range to tighten the screws. When using a wrench to tighten the screws,
ensure that the wrench does not tilt and the torque error does not exceed
10% of the specied value.
● Ensure that bolts are tightened with a torque tool and marked in red and blue
after double-check. Installation personnel mark tightened bolts in blue.
Quality inspection personnel conrm that the bolts are tightened and then
mark them in red. (The marks must cross the edges of the bolts.)
● If the equipment has multiple inputs, disconnect all the inputs before
operating the equipment.
● Before maintaining a downstream electrical or power distribution device, turn
o the output switch on the power supply equipment.
● During equipment maintenance, attach "Do not switch on" labels near the
upstream and downstream switches or circuit breakers as well as warning
signs to prevent accidental connection. The equipment can be powered on
only after troubleshooting is complete.
● Do not open equipment panels.
● Check equipment connections periodically, ensuring that all screws are
securely tightened.
● Only qualied professionals can replace a damaged cable.
● Do not scrawl, damage, or block any labels or nameplates on the equipment.
Promptly replace labels that have worn out.
● Do not use solvents such as water, alcohol, or oil to clean electrical
components inside or outside of the equipment.
EMMA-(A01, A02)
User Manual 1 Safety Information
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 5

Cabling Requirements
● When selecting, installing, and routing cables, follow local safety regulations
and rules.
● When routing power cables, ensure that there is no coiling or twisting. Do not
join or weld power cables. If necessary, use a longer cable.
● Ensure that all cables are properly connected and insulated, and meet
specications.
● Ensure that the slots and holes for routing cables are free from sharp edges,
and that the positions where cables are routed through pipes or cable holes
are equipped with cushion materials to prevent the cables from being
damaged by sharp edges or burrs.
● Ensure that cables of the same type are bound together neatly and straight
and that the cable sheath is intact. When routing cables of dierent types,
ensure that they are away from each other without entanglement and
overlapping.
● Secure buried cables using cable supports and cable clips. Ensure that the
cables in the backll area are in close contact with the ground to prevent
cable deformation or damage during backlling.
● If the external conditions (such as the cable layout or ambient temperature)
change, verify the cable usage in accordance with the IEC-60364-5-52 or local
laws and regulations. For example, check that the current-carrying capacity
meets requirements.
● When routing cables, reserve at least 30 mm clearance between the cables
and heat-generating components or areas. This prevents deterioration or
damage to the cable insulation layer.
1.3 Environment Requirements
D ANGER
Do not expose the equipment to ammable or explosive gas or smoke. Do not
perform any operation on the equipment in such environments.
D ANGER
Do not store any ammable or explosive materials in the equipment area.
D ANGER
Do not place the equipment near heat sources or re sources, such as smoke,
candles, heaters, or other heating devices. Overheat may damage the equipment
or cause a re.
EMMA-(A01, A02)
User Manual 1 Safety Information
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 6

WARNING
Install the equipment in an area far away from liquids. Do not install it under
areas prone to condensation, such as under water pipes and air exhaust vents, or
areas prone to water leakage, such as air conditioner vents, ventilation vents, or
feeder windows of the equipment room. Ensure that no liquid enters the
equipment to prevent faults or short circuits.
WARNING
To prevent damage or re due to high temperature, ensure that the ventilation
vents or heat dissipation systems are not obstructed or covered by other objects
while the equipment is running.
General Requirements
● Ensure that the equipment is stored in a clean, dry, and well ventilated area
with proper temperature and humidity and is protected from dust and
condensation.
● Keep the installation and operating environments of the equipment within the
allowed ranges. Otherwise, its performance and safety will be compromised.
● Do not install, use, or operate outdoor equipment and cables (including but
not limited to moving equipment, operating equipment and cables, inserting
connectors to or removing connectors from signal ports connected to outdoor
facilities, working at heights, performing outdoor installation, and opening
doors) in harsh weather conditions such as lightning, rain, snow, and level 6
or stronger wind.
● Do not install the equipment in an environment with dust, smoke, volatile or
corrosive gases, infrared and other radiations, organic solvents, or salty air.
● Do not install the equipment in an environment with conductive metal or
magnetic dust.
● Do not install the equipment in an area conducive to the growth of
microorganisms such as fungus or mildew.
● Do not install the equipment in an area with strong vibration, noise, or
electromagnetic interference.
● Ensure that the site complies with local laws, regulations, and related
standards.
● Ensure that the ground in the installation environment is solid, free from
spongy or soft soil, and not prone to subsidence. The site must not be located
in a low-lying land prone to water or snow accumulation, and the horizontal
level of the site must be above the highest water level of that area in history.
● Do not install the equipment in a position that may be submerged in water.
● If the equipment is installed in a place with abundant vegetation, in addition
to routine weeding, harden the ground underneath the equipment using
cement or gravel (recommended area: 3 m x 2.5 m).
● Do not install the equipment outdoors in salt-aected areas because it may
be corroded. A salt-aected area refers to the region within 500 m of the
EMMA-(A01, A02)
User Manual 1 Safety Information
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 7

coast or prone to sea breeze. Regions prone to sea breeze vary with weather
conditions (such as typhoons and monsoons) or terrains (such as dams and
hills).
● Before installation, operation, and maintenance, clean up any water, ice, snow,
or other foreign objects on the top of the equipment.
● When installing the equipment, ensure that the installation surface is solid
enough to bear the weight of the equipment.
● After installing the equipment, remove the packing materials such as cartons,
foam, plastics, and cable ties from the equipment area.
1.4 Mechanical Safety
WARNING
Ensure that all necessary tools are ready and inspected by a professional
organization. Do not use tools that have signs of scratches or fail to pass the
inspection or whose inspection validity period has expired. Ensure that the tools
are secure and not overloaded.
WARNING
Do not drill holes into the equipment. Doing so may aect the sealing
performance and electromagnetic containment of the equipment and damage
components or cables inside. Metal shavings from drilling may short-circuit boards
inside the equipment.
General Requirements
● Repaint any paint scratches caused during equipment transportation or
installation in a timely manner. Equipment with scratches must not be
exposed for an extended period of time.
● Do not perform operations such as arc welding and cutting on the equipment
without evaluation by the Company.
● Do not install other devices on the top of the equipment without evaluation
by the Company.
● When performing operations over the top of the equipment, take measures to
protect the equipment against damage.
● Use correct tools and operate them in the correct way.
Moving Heavy Objects
● Be cautious to prevent injury when moving heavy objects.
EMMA-(A01, A02)
User Manual 1 Safety Information
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 8

● If multiple persons need to move a heavy object together, determine the
manpower and work division with consideration of height and other
conditions to ensure that the weight is equally distributed.
● If two persons or more move a heavy object together, ensure that the object
is lifted and landed simultaneously and moved at a uniform pace under the
supervision of one person.
● Wear personal protective gears such as protective gloves and shoes when
manually moving the equipment.
● To move an object by hand, approach to the object, squat down, and then lift
the object gently and stably by the force of the legs instead of your back. Do
not lift it suddenly or turn your body around.
● Do not quickly lift a heavy object above your waist. Place the object on a
workbench that is half-waist high or any other appropriate place, adjust the
positions of your palms, and then lift it.
● Move a heavy object stably with balanced force at an even and low speed. Put
down the object stably and slowly to prevent any collision or drop from
scratching the surface of the equipment or damaging the components and
cables.
● When moving a heavy object, be aware of the workbench, slope, staircase,
and slippery places. When moving a heavy object through a door, ensure that
the door is wide enough to move the object and avoid bumping or injury.
● When transferring a heavy object, move your feet instead of turning your
waist around. When lifting and transferring a heavy object, ensure that your
feet point to the target direction of movement.
● When transporting the equipment using a pallet truck or forklift, ensure that
the tynes are properly positioned so that the equipment does not topple.
Before moving the equipment, secure it to the pallet truck or forklift using
ropes. When moving the equipment, assign dedicated personnel to take care
of it.
● Choose sea, roads in good conditions, or airplanes for transportation. Do not
transport the equipment by railway. Avoid tilt or jolt during transportation.
Using Ladders
● Use wooden or insulated ladders when you need to perform live-line working
at heights.
● Platform ladders with protective rails are preferred. Single ladders are not
recommended.
● Before using a ladder, check that it is intact and conrm its load bearing
capacity. Do not overload it.
● Ensure that the ladder is securely positioned and held rm.
EMMA-(A01, A02)
User Manual 1 Safety Information
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 9

● When climbing up the ladder, keep your body stable and your center of
gravity between the side rails, and do not overreach to the sides.
● When a step ladder is used, ensure that the pull ropes are secured.
● If a single ladder is used, the recommended angle for the ladder against the
oor is 75 degrees, as shown in the following gure. A square can be used to
measure the angle.
● If a single ladder is used, ensure that the wider end of the ladder is at the
bottom, and take protective measures to prevent the ladder from sliding.
● If a single ladder is used, do not climb higher than the fourth rung of the
ladder from the top.
● If you use a single ladder to climb up to a platform, ensure that the ladder is
at least 1 m higher than the platform.
EMMA-(A01, A02)
User Manual 1 Safety Information
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 10

Hoisting
● Only trained and qualied personnel are allowed to perform hoisting
operations.
● Install temporary warning signs or fences to isolate the hoisting area.
● Ensure that the foundation where hoisting is performed on meets the load-
bearing requirements.
● Before hoisting objects, ensure that hoisting tools are rmly secured onto a
xed object or wall that meets the load-bearing requirements.
● During hoisting, do not stand or walk under the crane or the hoisted objects.
● Do not drag steel ropes and hoisting tools or bump the hoisted objects
against hard objects during hoisting.
● Ensure that the angle between two hoisting ropes is no more than 90
degrees, as shown in the following gure.
Drilling Holes
● Obtain consent from the customer and contractor before drilling holes.
● Wear protective equipment such as safety goggles and protective gloves when
drilling holes.
● To avoid short circuits or other risks, do not drill holes into buried pipes or
cables.
● When drilling holes, protect the equipment from shavings. After drilling, clean
up any shavings.
EMMA-(A01, A02)
User Manual 1 Safety Information
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 11

2 Product Description
2.1 Model Description
This document involves the following product models:
● EMMA-A01
● EMMA-A02
Figure 2-1 Model description (using EMMA-A02 as an example)
Table 2-1 Model description
No. Item Description
1 Product family name EMMA: smart home energy controller
2 Hardware ID A: hardware platform version
3Conguration ID ● 01: Only PV and energy storage system
(ESS) features are supported.
● 02: Features of PV, ESSs, smart
chargers, and smart loads are
supported.
2.2 Networking
The EMMA is a device that manages energy in a home with a PV system. It can
implement unied scheduling and management of home energy. The EMMA has
two models:
EMMA-(A01, A02)
User Manual 2 Product Description
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 12

● EMMA-A01: Only PV and ESS features are supported. Plant-level power
control functions, such as maximum self-consumption and grid-tied point
control, are supported for unied scheduling of home energy and plant-level
energy optimization, further improving the PV energy utilization.
● EMMA-A02: Features of PV, ESSs, smart chargers, and smart loads are
supported. In addition to unied scheduling of home energy, the EMMA-A02
can connect to smart loads such as chargers, SG Ready heat pumps, and
smart switches. Users can set the reservation time to charge vehicles and
heat water in advance at the specied time. In addition, users can set the
priority to use PV energy for devices as required to make the best use of PV
energy.
Figure 2-2 Networking diagram (using the EMMA-A02 as an example)
(A) Power load (B) Smart switch (C) SG Ready heat pump
(D) Charger (E) Router (F) FusionSolar Smart PV
Management System
(SmartPVMS)
(G) FusionSolar app (H) Power grid (I) ESS
(J) PV string (K) Inverter (L) EMMA
The networking is described as follows:
● The preceding gure uses the EMMA-A02 as an example. The EMMA-A01
cannot connect to smart electrical devices such as chargers, SG Ready heat
pumps, and smart switches.
● Inverters connect to the EMMA over RS485. A maximum of three inverters can
be connected in parallel.
● The EMMA is connected to the router through the FE or WLAN port.
EMMA-(A01, A02)
User Manual 2 Product Description
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 13

● A maximum of two chargers can be connected.
– If there is only one charger, it can be directly connected to the EMMA
through the FE port or connected to the router through the FE or WLAN
port.
– If there are two chargers, they must be connected to the router only
through the FE or WLAN port. Do not connect one charger to the EMMA
and the other charger to the router respectively at the same time.
● The EMMA directly controls the SG Ready heat pump through dry contacts or
an external relay.
● Smart switch devices (including smart sockets, smart circuit breakers, and
smart relays) can be connected to the router through the FE or WLAN port.
2.3 Appearance
Appearance and Ports
Figure 2-3 Appearance description
(1) AC output port (L1 OUT/L2
OUT/L3 OUT/N OUT)
(2) External WLAN antenna port
(ANT)
(3) 12 V input/RS485 communication/
external CT input port (12V_IN/
RS485/CT Input)
(4) RS485 communication/DI/12 V
output/DO port (RS485/DI/12
V_OUT/DO)
(5) AC input port (L1 IN/L2 IN/L3 IN/N
IN)
(6) WAN port (WAN)
(7) LAN port (LAN) (8) LED indicator/RST button
EMMA-(A01, A02)
User Manual 2 Product Description
Issue 01 (2023-09-15) Copyright © Huawei Digital Power Technologies Co., Ltd. 14