Summary of Contents for Njoy DDSU666
- Page 1 DDSU666 SIAMETER1P666CU01H User manual 322.10.23.0 Before using this product, carefully read all product documentation and retain it for future reference.
- Page 2 A Smart Meter is a bidirectional device that records the load curve and controls the various energy flows, giving highly accurate measurements and rapid communication through the chosen communication network. nJoy inverters models that are compatible with this product: Astris Series Grid-tied inverter Monophase...
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Page 3: Brief Introduction
Brief Introduction 1.1. Main application & applicable range Type DDSU666 single phase electronic energy meter (din-rail) (hereinafter referred to as the “instrument”) is designed based on power monitoring and energy metering demands for electric power system, communication industry, construction industry, etc. as a new generation of intelligent instrument... -
Page 4: Working Principle
Main Technical Performance & Parameters 3.1 Model specification Accuracy Reference Current Instrument Model Frequency Type class voltage specification constant Active 800imp/ Direct DDSU666.004.0004 60Hz 230 V 5(80)A Class 1 connection Active 6400imp/ DDSU666.004.0004 60Hz 230 V 1.5(6)A Class1 transformer Table 1 Model specification NOTE! - Page 5 3.2Percentage error Percentage error limit of each class Type Current range Power factor instrument (%) Class 1 0.01In≤I<0.05In ±1.5 0.05In≤I≤Imax ±1.0 Via CT 0.02In≤I<0.1In 0.5L, 0.8C ±1.5 0.1In≤I≤Imax 0.5L, 0.8C ±1.0 0.05Ib≤I<0.1Ib ±1.5 0.1Ib≤I≤Imax ±1.0 Direct connection 0.01Ib≤I<0.2Ib 0.5L, 0.8C ±1.5 0.2Ib≤I≤Imax 0.5L, 0.8C...
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Page 6: Main Functions
3.5 Defluction Specified operating voltage range 0.9Un~1.1Un Extended operating voltage range 0.8Un~1.15Un Ultimate operating voltage range 0 Un~1.15Un Power consumption of the voltage circuit ≤1W/8VA Power consumption of the current circuit ≤2.5VA Table 4 Electrical parameters 3.6 Other technical parameters 0~999999.99 kWh (only display 6 bit, automatic shift Measuring range of decimal point) - Page 7 Table 7 LCD logo meanings Symbol Meaning The unit of the voltage, the display data of indicating LCD is voltage The unit of the current, the display data of indicating LCD is current The unit of the active power, the display data of indicating LCD is active power The unit of the reactive power, the display data of indicating LCD is reactive power The unit of the frequency, the display data of indicating LCD is frequency...
- Page 8 Means the current display is the power factor Ft, the left picture is Ft=1.000. Means the current display is frequency F, the left picture is F=50.00Hz. Means the current positive active energy EImp, the unit is “kWh”, the left picture is EImp=1.20kWh. ...
- Page 9 Keyboard operation: After pressing the button for a long time, the display interface enters the switching interface of setting 645 protocol and Modbus protocol. Shortly press can switch the protocol, not the address page (only the ModBus protocol can be switched to the address page), the address of ModBus can be set by the button, the button can set the address range 1-99 Figure 3 Long press button 4.3 Communication function...
- Page 10 Figure 4 Schematic diagram of communication connection When the instrument is set to be ModBus-RTU transmission mode, ModBus-RTU communication protocol adopts host-slave response in one communication line. Firstly, the host computer’s signal will seek for a terminal device (slave) with only one address, then the terminal device will produce response signal and transmit to the host computer in opposite direction, that is, half duplex working mode.
- Page 11 0006H Addr C o m m u n i c a t i o n 16-bit with address Addr symbols 0007H Urat RESERVED 16-bit with symbols 0008H Irat RESERVED 16-bit with symbols 0009H RESERVED RESERVED 16-bit with symbols 000AH RESERVED RESERVED 16-bit with symbols...
- Page 12 ChangeProtocol such as protocol switching, data for 2 for Modbus RTU protocol -, data to 1 for DL/T 645-2007; The CLr. E power reset write 1 removal of total power; BAud rate: 1:2400bps; 2:4800bps; 3:9600bps; 4.4 Outline &Mounting Dimension Outline dimension: 36mm×98mm×65mm Din rail mounting dimension: 35mm, with configuration to be shown as figure 4 Figure 5 Configuration...
- Page 13 5.3 Wiring mode 6.3.1 Instruction of wiring terminal Before powering, you must check whether the wiring mode of the instrument is correct, and the wiring diagram is shown as below: Figure 6 Direct connection Figure 7 Via transformer...
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Page 14: Transportation And Storage
Diagnosis, analysis and elimination of common faults Fault Analysis of Troubleshooting Remark phenomenon causes Check if the actual connection is The wiring may While checking the the same as the requirement of not connected connection, be sure the wiring diagram. Pay special according to the meter is in the Display fault... -
Page 15: Appendix A: Modbus-Rtu Communication Protocol
Maintenance & Service Appendix A: MODBUS-RTU Communication Protocol A.1 Communication format Information transmission adopts asynchronous mode, taking byte as the unit. The communication date transmitted between the host and slave computer is the format of 10-digit characters, including one start bit(0), 8 data bits without check bit, two stop bits(1)(other format can be customized). - Page 16 by the host computer, which indicates that the slave computer has responded the host and complemented the relative operation. The instrument supports the following two function codes: Function Definition Operation code Read register Read one or several register data Write multichannel Write n 16-bit binary data into n continuous registers register Table A.2...
- Page 17 The slave returns Return message Address code Function code Bytes High byte Register 0CH data low byte High byte Register 0DH data low byte low byte CRC check code High byte Table A.4 A.3.2 Function code 10H: Write multi-port register For example: The host intends to save data of 0002H, 1388H, 000AH into the slave address of 01H, the start register address is the three registers of 00H, sent by the host:...
- Page 18 Returned by the slave The slave returns Return message Address code Function code High byte Start register address low byte High byte Register number low byte low byte Register number High byte Table A.6 A.4 16-digit CRC check code The host or slave computer can be judged by the check code to see if the received information is correct or not.
- Page 19 7) After calculating all the bytes of the communication information frame (exclude CRC check code) according to the above steps, the content of the CRC register to be get is: 16-digit CRC check code A.5 Error handling When the meter detects other errors except the error of CRC check code, the information will be returned to the host, the highest digit of the function code is 1, i.e.
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