DDSU666-H Smart Power Sensor User Manual

About This Document

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:

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.

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
• 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

DANGER 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

DANGER 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.

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;

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.

A textual representation of the diagram shows a Voltage input (U), Current input (I), a Sampling circuit, an MCU, a Power circuit, a Memory circuit, and a Communication circuit, all interconnected.

Functions

• Metering function: Accurately metering the positive/ reverse active energy and combined active energy, with 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. The display bit of energy measurement value can be six bits, with display range from 0 to 999999kWh.

A textual representation of the LCD display shows:

Imp. Exp NO. TIME MKVVAh
888888

• Cyclic display: Characterized with cyclic display function, the shift time of cyclic display is 5s.

0001.20 kWh

000100 kWh Exp.

P 1.100 kW

U 220.0 V

I 5.000 A

F 50.00 Hz

• Button display: The instrument has button display and backlight function.

0000.20 kWh

000120 kWh

0001.00 kWh Exp.

71.9600

011

U 220.0 V

I 5.000 A

P 1.100 kW

Ft 1.000

F 50.00 Hz

NOTE:

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:

A diagram shows the process of setting communication address and baud rate. It involves powering on, long pressing a button for 3 seconds to enter the Comm.Add Interface, pressing the button once to switch to Baud Interface, and exiting after 20 seconds of inactivity.

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.

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.

A diagram illustrates an application scenario: A PV Module is connected to a Smart Energy Center, which includes a Smart Power Sensor. The Smart Energy Center is also connected to an energy storage system and loads. An alarm system is also present. The Smart Energy Center communicates with the Meter of electric utility company and the Grid via RS-485.

2.4 Model Naming Conventions

A diagram shows the model naming convention for the DDSU666-H sensor:

DD/T/S SU 666

The components are explained as:

• Design Number: DD/T/S
• DIN Rail: SU
• Electronic type: 666
• Connection mode: D: Single phase AC Energy Meter; T: Three phase four wire AC Energy Meter; S: Three phase three wire AC Energy Meter;
• Energy Meter: (Implied by context)

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.

A diagram shows the product dimensions: 65mm, 52mm, 36mm, and 100mm, with a detail view of the mounting mechanism.

3 System Maintenance

3.1 Troubleshooting

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

A Technical Specifications

A.1 Environmental Specifications

A.2 Main technical performance and parameter

A.2.1 Electrical parameter

A.2.2 Percentage error

The percentage error of the sensor cannot exceed the following corresponding limited value.

A.2.3 Start

Under the referenced voltage and Table A-1, the sensor starts and continuously metering the electrical energy.

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

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

A.5 Wiring terminal instruction

A wiring diagram shows the connections for the DDSU666-H Smart Power Sensor. It includes connections for LOAD, CT, LINE (L and N), and RS485B/RS485A.

B Acronyms and Abbreviations