Huawei DTSU666-H User manual

DTSU666-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.
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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

DTSU666-H Smart Power Sensor
User Manual
About This Document
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About This Document
Purpose
This document describes the DTSU666-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 Conventions
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.

DTSU666-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.

DTSU666-H Smart Power Sensor
User Manual
Contents
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Contents
About This Document.................................................................................................................... ii
1 Safety Precautions.........................................................................................................................1
2 Overview.........................................................................................................................................5
2.1 Product Overview.........................................................................................................................................................5
2.2 Working Principles........................................................................................................................................................6
2.2.1 Conceptual Diagram..................................................................................................................................................6
2.2.2 Functions ...................................................................................................................................................................7
2.3 Application Scenarios.................................................................................................................................................10
2.4 Model Naming Conventions....................................................................................................................................... 11
2.5 Product Structure ........................................................................................................................................................ 11
3 System Maintenance...................................................................................................................13
3.1 Troubleshooting..........................................................................................................................................................13
A Technical Specifications ...........................................................................................................15
A.1 Environmental Specifications....................................................................................................................................15
A.2 Main technical performance and parameter...............................................................................................................15
A.2.1 Electrical parameter ................................................................................................................................................15
A.2.2 Percentage error......................................................................................................................................................16
A.2.3 Start.........................................................................................................................................................................16
A.2.4 Defluction ...............................................................................................................................................................16
A.2.5 Other technical parameter.......................................................................................................................................17
A.3 EMC Specifications...................................................................................................................................................17
A.4 Structure Specifications .............................................................................................................................................17
A.5 Wiring terminal instruction........................................................................................................................................18
B Acronyms and Abbreviations B...............................................................................................19

DTSU666-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. The manufacturer 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.
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”

DTSU666-H Smart Power Sensor
User Manual
1 Safety Precautions
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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
The manufacturer 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
Operation in extreme environments which are not covered in this document
The DTSU666-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 DTSU666-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).

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User Manual
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Protect Labels
Do not scrawl or damage any warning labels on the DTSU666-H because these labels
contain important information about safe operation.
Do not scrawl or damage the nameplate on the back of the DTSU666-H because it
contains important product information.
Installation
Ensure that the DTSU666-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 DTSU666-H and other objects.
Electrical Connections
Before connecting cables, ensure that the DTSU666-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.
Operation
High voltage may cause an electric shock, which results in serious injury, death, or serious
property damage from the DTSU666-H in operation. Strictly comply with the safety
precautions in this document and associated documents when operating the DTSU666-H.
Do not touch an energized DTSU666-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 DTSU666-H in operation. Therefore, before maintenance, power
off the DTSU666-H and strictly comply with the safety precautions in this document and
associated documents to operate the DTSU666-H.

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Maintain the DTSU666-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 DTSU666-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.

DTSU666-H Smart Power Sensor
User Manual
2 Overview
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2 Overview
2.1 Product Overview
Type DTSU666-H Smart Power Sensor (here in after referred to as the “sensor”) adopts
large-scaled integrated circuit with digital sampling technology, specially designed for power
monitoring and energy metering demands including power system, communication industry,
construction industry, mainly applied into real-time measurement and display for parameters
such as three phase voltage, three phase current, active power, reactive power, frequency,
positive and reverse energy, four quadrant electric energy, etc. Adopting the standard
DIN35mm din rail mounting, structural module design, it is characterized with small volume,
easy installation and networking, etc. As a monitoring terminal product towards energy
management system, it can be widely applied into internal power assessment and monitoring
of the industrial and mining enterprises, hotels, schools, large public buildings.
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 DTSU666-H
2.2 Working Principles
2.2.1 Conceptual Diagram
The instrument is composed of highly accurate metering integrated circuit (ASIC),
management MCU, storage chip, RS485 communication module, etc. The conceptual diagram
is shown in Figure 2-2.
Figure 2-2 Conceptual diagram

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2.2.2 Functions
Display function:
The displayed interfacial electrical parameter and power data are both for primary side
data (which has already multiplied by the current and voltage ratios). The energy
measurement value is displayed in seven bits, with the display range from 0.00 kWh to
999999.9 kWh.
Figure 2-3 Liquid crystal display
Table 2-1 Display (Auto loop)
No.
Display interface
Instruction
No.
Display interface
Instructi
on
1
Imp. active
power
=10000.0kWh
2
Exp.
active
energy
=2345.67
kWh
3
active power
=3.291kW
4
Phase A
voltage
=220.0V
5
Phase B
voltage
=220.1V
6
Phase C
voltage
=220.20V
7
Phase A
current
=5.001A
8
Phase B
current
=5.001A
9
Phase C
current
=5.002A
10
Frequenc
y
Freq=50.
00Hz
No button operation backlight is closed for 60 seconds. Auto loop Switch time = 5s.

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Table 2-2 Display
No.
Display interface
Instruction
No.
Display interface
Instructi
on
1
Comb.active
energy
=7654.33kW
h
2
Imp.
active
power
=10000.0k
Wh
3
Exp. active
energy
=2345.67kW
h
4
None
parity,1
stop bit,
baud=960
0bps
5
Comm.Add
=011
6
Phase A
voltage
=220.0V
7
Phase B
voltage
=220.1V
8
Phase C
voltage
=220.20V
9
Phase A
current
=5.001A
10
Phase B
current
=5.001A
11
Phase C
current
=5.002A
12
active
power
=3.291kW
13
Phase A
active power
=1.090kW
14
Phase B
active
power
=1.101kW
15
Phase C
active power
=1.100kW
16
power
factor
=0.500
inductive
17
Phase A
power factor
PFa=1.000L
18
Phase B
power
factor
PFb=0.50
0L
19
Phase C
power factor
PFc=0.500C
20
Frequency
Freq=50.0
0Hz

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1. Change By Key “”
2. Comb. active energy = Imp. active energy - Exp. active energy
Programming function:
Table 2-3 Programming function
Param
eter
Value range
Description
1: 645;
2: n.2;
3: n.1;
4: E.1;
5: O.1;
Settings for communication stop bit and Parity bits:
1: Factory mode;
2: None parity, 2 stop bits, n.2;
3: None parity, 1 stop bit, n.1;
4: Even parity, 1 stop bit, E.1;
5: Odd parity, 1 stop bit, O.1;
0: 4.800;
1: 9.600;
Communication baud rate:
0: 4800bps;
1: 9600bps;
11-19
Communication address
Programming operation: button description: “SET”button represents “confirmation”, or
“Cursor shift”(when input digits), “ESC”button represents “Exit”, “ ” button
represents “increase”. The input password is (default to be 701).
Figure 2-4 Setting example for Modify communication address or baud rate

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Communication function
The Sensor has a RS485 communication interface, the baud rate can be changed between
4800bps and 9600bps. The default Communication parameters is 9600bps, none parity
bits and 1 stop bit, and communication addresses (see factory numbers or LCD display),
support ModBus RTU protocol.
ModBus-RTU interface definition is defined in document “Huawei inverter matching
meter Modbus interface definition description”,Article 2.1 general signal definition table
(Float), document version V100, release date 2018-01-29.
2.3 Application Scenarios
Scenario 1: The smart power 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 Scenarios

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2.4 Model Naming Conventions
Figure 2-6 Model naming conventions
Table 2-4 Model specification
Model No.
Accuracy
grade
Referenced
voltage
Current
specificatio
n
Instrument
constant
Type
DTSU666-H
Active class
1
3×220/380
V
100 A/40
mA
800
imp/kWh
Via
transformer
Please take the physical label as standard.
2.5 Product Structure
Model No.
Module
Outline dimension (H×W×D）
mm
Installation dimension
(Din-rail)
DTSU666-H
4
72×100×65.5
DIN35 standard din-rail

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Figure 2-7 Product dimensions

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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 change the cable.
2. Set the address, baud
rate, data bit and parity
bit of the instrument to
be the same as the host
computer through
buttons and so as the
“parameter setting”.
Power metering inaccuracy
1. Wrong 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, to be abnormal if
any negative values.
For wrong wiring, please
connect based on the correct
wiring mode (see
Connecting Diagram).

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Contact the installation vendor if all failure analysis procedures listed above are completed and the fault
still exists.

DTSU666-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
-40ºC 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
0.9-1.1 Un
Extended working
voltage range
0.8-1.15 Un
Power consumption of
voltage
≤ 1.5 W and 6 VA
Power consumption of
current
Ib < 10 A
≤ 0.2 VA
Ib ≥ 10 A
≤ 0.4 VA
Data storage time after
power interruption
≥ 10 years