Huawei DDSU666-H User manual

DDSU666-H Smart Power Sensor
User Manual
Issue
01
Date
2018-05-18
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

DDSU666-H Smart Power Sensor
User Manual
About This Document
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About This Document
Purpose
This document describes the DDSU666-H Smart Power Sensor in terms of its functions,
electrical properties, and structure.
Figures provided in this document are for reference only.
Intended Audience
This document is intended for:
Sales engineers
Technical support engineers
Maintenance engineers
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 death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
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.

DDSU666-H Smart Power Sensor
User Manual
About This Document
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Symbol
Description
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.
Change History
Changes between document issues are cumulative. The latest document issue contains all
updates made in previous issues.
Issue 01 (2018-05-18)
This issue is the first official release.

DDSU666-H Smart Power Sensor
User Manual
Contents
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Contents
About This Document.................................................................................................................... ii
1 Safety Precautions.........................................................................................................................1
2 Overview.........................................................................................................................................4
2.1 Product Overview.........................................................................................................................................................4
2.2 Working Principles........................................................................................................................................................5
2.3 Application Scenarios ...................................................................................................................................................9
2.4 Model Naming Conventions.........................................................................................................................................9
2.5 Product Structure ........................................................................................................................................................10
3 System Maintenance...................................................................................................................11
3.1 Troubleshooting.......................................................................................................................................................... 11
A Technical Specifications ...........................................................................................................13
A.1 Environmental Specifications....................................................................................................................................13
A.2 Main technical performance and parameter...............................................................................................................13
A.2.1 Electrical parameter ................................................................................................................................................13
A.2.2 Percentage error......................................................................................................................................................13
A.2.3 Start.........................................................................................................................................................................14
A.2.4 Defluction ...............................................................................................................................................................14
A.2.5 Other technical parameters .....................................................................................................................................14
A.3 EMC Specifications...................................................................................................................................................15
A.4 Structure Specifications .............................................................................................................................................15
A.5 Wiring terminal instruction........................................................................................................................................16
B Acronyms and Abbreviations B...............................................................................................17

DDSU666-H Smart Power Sensor
User Manual
1 Safety Precautions
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1 Safety Precautions
General Safety
Follow the precautions and special safety instructions provided by Huawei when
operating this product. Personnel who plan to install or maintain Huawei devices must
receive a thorough training, understand all necessary safety precautions, and be able to
correctly perform all operations. Huawei will not be liable for any consequences that are
caused by the violation of general safety regulations and device usage safety standards.
Before performing operations, read through this manual and follow all the precautions to
prevent accidents. The “DANGER”, “WARNING”, “CAUTION”, and “NOTICE”
statements in this document do not represent all the safety instructions. They are only
supplements to the safety instructions.
Operation personnel should comply with local laws and regulations. The safety
instructions in this document are only supplements to local laws and regulations.
Do not operate the product or handle cables during thunderstorms.
Before operating the product, remove any conductors such as jewelry or watches.
Use insulated tools during operations.
Bolts should be tightened with a torque wrench and marked using red or blue color.
Installation personnel should mark tightened bolts in blue. Quality inspection personnel
should confirm if the bolts are tightened and then mark them in red. If screws or bolts
used to secure the device are not tightened to the required torque, the device may fall
from the mounting bracket.
Follow specified procedures during installation and maintenance. Do not attempt to alter
the device or deviate from the recommended installation procedures without prior
consent from the manufacturer.
Install the product in strict accordance with the quick guide.
Disclaimer
Huawei shall not be liable for any consequence caused by any of the following events:
Transportation damage
The storage conditions do not meet the requirements specified in this document.
Incorrect installation or use
Installation or use by unqualified personnel
Failure to obey the operation instructions and safety precautions in this document

DDSU666-H Smart Power Sensor
User Manual
1 Safety Precautions
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Operation in extreme environments which are not covered in this document
The DDSU666-H operates beyond specified ranges.
Unauthorized modifications to the product or software code or removal of the product
Device damage due to force majeure (such as lightning, fire, and storm)
The warranty expires and the warranty service is not extended
Installation or use in environments which are not specified in related international
standards
Personnel Requirements
Only certified electricians are allowed to install, connect cables for, maintain, troubleshoot,
and replace the DDSU666-H.
Operation personnel should receive professional training.
Operation personnel should read through this document and follow all the precautions.
Operation personnel should be familiar with the safety specifications about the electrical
system.
Operation personnel should understand the composition and working principles of the
grid-tied PV power system and local regulations.
Operation personnel must wear proper personal protective equipment (PPE).
Protect Labels
Do not scrawl or damage any warning labels on the DDSU666-H because these labels
contain important information about safe operation.
Do not scrawl or damage the nameplate on the back of the DDSU666-H because it
contains important product information.
Installation
Ensure that the DDSU666-H is not connected to a power supply or powered on before
finishing installation.
To allow proper heat dissipation and installation, maintain appropriate clearances
between the DDSU666-H and other objects.
Electrical Connections
Before connecting cables, ensure that the DDSU666-H is not damaged in any way. Otherwise,
electric shocks or fire may occur.
Ensure that all electrical connections comply with local electrical standards.
Ensure that the cables used in a grid-tied PV system are properly connected and insulated
and meet all specification requirements.

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Operation
High voltage may cause an electric shock, which results in serious injury, death, or serious
property damage from the DDSU666-H in operation. Strictly comply with the safety
precautions in this document and associated documents when operating the DDSU666-H.
Do not touch an energized DDSU666-H because it has a high temperature.
Follow local laws and regulations when operating the device.
Maintenance and Replacement
High voltage may cause an electric shock, which results in serious injury, death, or serious
property damage from the DDSU666-H in operation. Therefore, before maintenance, power
off the DDSU666-H and strictly comply with the safety precautions in this document and
associated documents to operate the DDSU666-H.
Maintain the DDSU666-H with sufficient knowledge of this document and proper tools
and testing devices.
Temporary warning signs or fences must be placed to prevent unauthorized people from
entering the site.
The DDSU666-H can be powered on only after all faults are rectified. Failing to do so
may escalate faults or damage the device.
During the maintenance, observe ESD precautions and wear ESD gloves.

DDSU666-H Smart Power Sensor
User Manual
2 Overview
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2 Overview
2.1 Product Overview
Type DDSU666-H Smart Power Sensor (hereinafter referred to as the “Sensor”) is specially
designed for the distributed photovoltaic system, to be a new Smart power sensor, combined
with measurement and communication, mainly applied into the measurement for electrical
quantity including voltage, current, power ,frequency, power factor, active energy etc. in the
electrical circuit. It can realize networking with the external device through RS485
communication interface. Adopting the standard DIN35mm din rail mounting, structural
module design, it is characterized with small volume, easy installation and networking, etc.
This performance index of the meter conforms to the following relevant technical standard:
EN 61326-1: 2013; IEC 61326-1: 2012;
EN 61326-2-1: 2013; IEC 61326-2-1: 2012;
EN 61010-1: 2010; IEC 61010-1:2010;
EN 61010-2-1: 2010; IEC 61010-2-1: 2010;

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Figure 2-1 DDSU666-H
2.2 Working Principles
Conceptual Diagram
The Sensor can convert the voltage and current signal to be the signal that can be identified by
MCU through the sampling circuit, MCU will calculate and convert it into energy, power,
power factor and other electrical quantity by calculating the signals in the sampling circuit,
transferring to users through communication and meanwhile save the data in the storage
circuit. Please see the conceptual diagram of the Sensor as Figure 2-2 Conceptual diagram.

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Figure 2-2 Conceptual diagram
Functions
Metering function:
Accurately metering the positive/ reverse active energy and combined active energy, no
storage data loss for the sensor after power interruption.
Measurement function of electrical parameters
The sensor can accurately measure electrical parameters including power, voltage,
current, frequency, power factor, etc.
Display function
The instrument adopts field LCD design, characterized with display function for electrical
parameters and energy data. Please see LCD display in Figure 2-3 Liquid crystal display.
The display bit of energy measurement value can be six bits, with display range from 0 to
999999kWh.
Figure 2-3 Liquid crystal display
Cyclic display
Characterized with cyclic display function, the shift time of cyclic display is 5s. Please see the
cyclic displayed item in Table 2-1 Cyclic displayed items.
Table 2-1 Cyclic displayed items
No.
Content
Description

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No.
Content
Description
1
Current positive active energy Imp = 1.20kWh
2
Current reverse active energy Exp = 1.00kWh
3
Active power P=1.100kW
4
Voltage U U=220.0V
5
Current I=5.000A
6
Frequency F=50.00Hz
Button display
The instrument has button display and backlight function, please see button displayed items in
Table 2-2 Button displayed items.
Table 2-2 Button displayed items
No.
Content
Description
1
Current combined active energy =0.20kWh
2
Current positive active energy Imp = 1.20kWh
3
Current reverse active energy Exp = 1.00kWh
4
n.1. data format to be eight bits, none parity bit and one
stop bit.
9600: baud rate to be 9600bps
4800: baud rate to be 4800bps
5
Comm.Add=11
6
Voltage U=220.0V

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No.
Content
Description
7
Current I=5.000A
8
Active power P=1.100kW
9
Power factor Ft=1.000
10
Frequency F=50.00Hz
1. Backlight closed without button operation for sixty seconds.
2. The combined active energy default by the factory is equal to positive active energy.
Parameter setting function
The sensor can set the communication address and baud rate through buttons.
Setting method please see Figure 2-4: Long press the button 3s, the sensor will automatically
enter into the communication address setting interface, with cyclic display for setting display
interface of baud rate and communication address. Please press the button when required for
baud rate or communication address settings, it will exit to communication address and baud
rate settings without button operation for twenty seconds.
The details are as follows:
Figure 2-4 Communication address and baud rate setting diagrammatic sketch
Communication function
The sensor is equipped with one RS485 communication interface, with baud rate changed
among 4800bps and 9600bps. The default baud rate is 9600bps with check bit and stop bit to
be n.1, communication address (see factory number or LCD display), support ModBus-RTU
protocol.

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For the definition of ModBus-RTU interface, please see article 2.1 of General signal
definition table (Float) of Modbus interface definition and description of Huawei Smart
Power Sensor with word version of V100, issued on January 29th, 2018.
2.3 Application Scenarios
Scenario 1: The sensor is used to realize power restriction of the power grid with charge and
discharge control towards energy storage in the household inverter scheme, which is the core
component for household energy management. It adopts RS485 communication, which can
realize the electrical quantity measurement, energy metering function and in respond to the
upper host for the real-time data query.
Figure 2-5 Application Scenario
2.4 Model Naming Conventions
Figure 2-6 Model naming conventions

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Table 2-3 Model Specification
Model No.
Accuracy
grade
Reference
d voltage
Current
specification
Collector
constant
Type
DDSU666-
H
Active Class
1
230 V
100 A/40 mA
800
imp/kWh
Via
transformer
2.5 Product Structure
Outline dimension: 36mm x 98mm x 66mm; Din-rail mounting dimension: 35mm, for the
outline and installation dimension, please see Figure 2-7 as below.
Figure 2-7 Product dimensions

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3 System Maintenance
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3 System Maintenance
3.1 Troubleshooting
Table 3-1 Common alarms and troubleshooting measures
Fault phenomenon
Factor analysis
Elimination method
No display after the
instrument being powered
on
1. Incorrect wiring mode;
2. Abnormal voltage
supplied for the
instrument;
1. If the wiring mode is
incorrect, please connect
based on the correct
wiring mode (see the
wiring diagram).
2. If the supplied voltage is
abnormal, please supply
the voltage on the
instrument specification.
Abnormal RS485
communication
1. The RS485
communication cable is
disconnected, short
circuit or reversely
connected.
2. The address, baud rate,
data bit and parity bit of
the instrument is not in
accordance with the host
computer;
1. If any problems for the
communication cable,
please reconnect or
change the cable.
2. Set the address, baud
rate, data bit, parity bit to
be the same as the host
computer through
buttons, for button
settings, please see
“parameter setting”.

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Fault phenomenon
Factor analysis
Elimination method
Inaccurate for energy
metering
1. Incorrect wiring, please
check whether the
corresponding phase
sequence of voltage and
current is correct.
2. Check whether the high
& low end of current
transformer inlet is
reversely connected.
Please observe the power
of Pa, Pb, Pc, to be
abnormal if any negative
values.
If the wiring mode is
incorrect, please connect
based on the correct wiring
mode (see the wiring
diagram).
Contact the installation vendor if all failure analysis procedures listed above are completed and the fault
still exists.

DDSU666-H Smart Power Sensor
User Manual
A Technical Specifications
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A Technical Specifications
A.1 Environmental Specifications
Item
Specifications
Regulated working temperature
range
-25ºC to +60ºC
Limited working temperature
range
-35ºC to +70ºC
Relative humidity (Annual
average)
≤75% RH
Atmospheric pressure
86-106 kPa
A.2 Main technical performance and parameter
A.2.1 Electrical parameter
Regulated working voltage range
176-288 VAC
Extended working voltage range
0.7-1.3 Un
Working frequency range
45-65 Hz
A.2.2 Percentage error
The percentage error of the sensor cannot exceed the following corresponding limited value.
Current value
Power factor
The percentage error
limitation of various
grade instruments
Direct connect
Via transformer
Class 1

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Current value
Power factor
The percentage error
limitation of various
grade instruments
Direct connect
Via transformer
Class 1
0.05Ⅰb ≤Ⅰ<
0.1Ⅰb
0.02Ⅰn ≤Ⅰ<
0.05Ⅰn
1
±1.5
0.1Ⅰb ≤Ⅰ≤
Ⅰmax
0.05Ⅰn ≤Ⅰ≤
Ⅰmax
1
±1.0
0.1Ⅰb ≤Ⅰ<
0.2Ⅰb
0.05Ⅰn ≤Ⅰ<
0.1Ⅰn
0.5L
±1.5
0.8C
±1.5
0.2Ⅰb ≤Ⅰ≤
Ⅰmax
0.1Ⅰn ≤Ⅰ≤
Ⅰmax
0.5L
±1.0
0.8C
±1.0
When users has special requirement
0.25L
±3.5
0.2Ⅰb ≤Ⅰ≤
Ⅰmax
0.1Ⅰn ≤Ⅰ≤
Ⅰmax
0.5C
±2.5
A.2.3 Start
Under the referenced voltage and Table A-1, the sensor starts and continuously metering the
electrical energy.
Sensor
Energy meter grade
Power factor
Class 1
Direct connect
0.004Ib
1
Via transformer
0.002Ib
A.2.4 Defluction
The sensor shall have good anti-creeping logic, when the voltage loop is added with 1.15
times of referenced voltage, when the current loop is disconnected, the energy meter will not
produce more than one pulse.
A.2.5 Other technical parameters
Scale range
0-999999.99 kWh
Communication
protocol
Modbus-RTU protocol

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A Technical Specifications
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A.3 EMC Specifications
EMC performance of the meter conforms to the following relevant technical standard:
IEC 61326-1:2012, IEC 61326-2-1:2012
EN 61326-1:2013, EN 61326-2-1:2013
EN61000-3-2:2005/A2:2009, EN61000-3-3:2008
A.4 Structure Specifications
Item
Specifications
Installation mode
Directly stuck the sensor on the din rail and finally install it
on the power distribution box.
1) When installing, please firstly stuck one side of the card
slot and then forcibly stuck it on the din rail.
2) When disassembling, please use a screwdriver to forcibly
hold the flexible card and then take out the sensor.
Dimensions (H x W x D)
36 mm x 100 mm x 65.5 mm (±0.5 mm)
Weight
≤0.3 kg