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model
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72
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80
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96
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120
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1. Product introduction
Digital single-phase AC current meter, voltage meter is one kind of programming measurement, display, alarm, digital communication and analog quantity output sent to other functions of the intelligent instrument, widely used in substation automation, distribution automation, intelligent building, automatic production lines, test station. True RMS measurement, high precision, good stability. Transformer ratio can be reset through the instrument key set, flexible and easy to use。
Four bright red LED display; optional two relay alarm output, implementation, the lower limit alarm function; optional RS-485 digital communication interface, use the standard MODBUS-RTU communication protocol, with a variety of PLC, HMI, configuration software to achieve network; optional analog quantity DC4 ~ 20mA analog output.
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2. Technical parameter
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parameter
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performance
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Signal input
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Voltage
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range
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100V 220V 450V 57.7V, etc.
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overload
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Continued: 1.2 times, instantaneous: 2 times /1S
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consumption
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＜1VA
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impedance
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＞380KΩ
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electric current
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range
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AC 5A/1A
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overload
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Continued: 1.2 times, instantaneous: 10 times /5S
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consumption
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＜1VA
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impedance
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＜20mΩ
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frequency
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45-65HZ
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Auxiliary power supply
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Linear power supply: AC220V + 5%; power consumption < 3VASwitching power supply: DC10-36V, AC/DC85-265V; power consumption < 3VA
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Relay output
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Two output, contact capacity: 1A/24VDC; 1A/220VAC
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Analog output
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DC4～20mA
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RS485communication
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RS485 communication interface, physical layer isolation, in line with the international standard MODBUS-RTU protocol
Baud rate 4800,9600, N81 data format
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Precision grade
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0.5
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Display mode
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Digital display: 4 high brightness LED digital tube
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Environmental
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Working temperature: -10-55 degrees C; storage temperature: -20-75
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security
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Insulation: signal, power supply, output terminal to shell resistor > 5M
Voltage: signal input, power supply, output between > AC2KV
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3. Appearance size and size of opening
3．1Appearance size and size of opening
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Exterior code
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Exterior dimension(mm)
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Opening size(mm)
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depth(mm)
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5
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96×48
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91×44
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85
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1
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160×80
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151×71
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85
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D
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48×48
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45×45
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85
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A
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72×72
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67×67
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90
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3
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80×80
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76×76
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85
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9
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96×96
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91×91
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85
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2
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120×120
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111×111
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85
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4. Panel button operatio
4．1 Key definition
Function keys SET: used to enter the menu items, to confirm the set number.
Reduce key ▼：Reducing the number
Add key ▲：Add number
4．2 Operation method
Click SET key，▲Key to increase the number，▼Key to reduce the number , Press the SET key to confirm the setting value, and enter the next set item. If you don't have the next item, exit to the measurement status.。
5. Parameter settin
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6. Functional module
6．1 Relay alarm output
Relay contact capacity：1A/250VAC，1A/24VDC。
Relay works in the upper and lower limit alarm, You can set this two alarm parameters : Upper
limit alarm value (the value of the secondary side) and the lower limit alarm value (the value of the secondary side), the upper limit alarm: when the measured value exceeds the limit alarm value, the high limit alarm relay, when the upper limit alarm after the action of the electric, only when the measured value is less than the upper limit alarm value, the upper limit alarm reset relay. Lower limit alarm note: when the measured value is lower than the lower limit alarm value, lower limit alarm relay, when the lower limit alarm relay action, only when the measured value is greater than the lower limit alarm value and the lower limit alarm reset relay。
6．2 Send an analog quantity output
Send an analog quantity output optional: DC4 ~ 20mA. An analog quantity output and input signal isolation, a linear corresponding relation are widely used for PLC, DCs were collected. Precision of 0.5 grade; output current, load resistance < 500 ohms, output voltage, load resistance > 100k ohms.
6．3 RS485 communication
6．3．1 communication protocol
(1) RS485 communication interface, asynchronous half duplex mode。
(2) 4800,9600bps baud rate can be set, the factory default value is 9600 BPS。
(3) Data format: N81 no parity bit, 8 data bits, 1 stop bits。
RS485 interface; connection type: asynchronous, half duplex; international standard Modbus RTU pro tocol instrument address: 1~247, baud rate 48009600, data format: N81 no parity bit, 8 data bits, 1 stop bit; the machine currently supports 03h read command。
Message format description：
Command03H：Read command
Host request： Address + Command + data address + data length + CRC check code
1byte + 1 byte + 2byte + 2 byte + 2 byte
Address: in order to check the instrument address code, you can set up in the 1~247, take up 1 bytes。
Command: 03H read command, the length of 1 bytes。
Data address: want to read the data starting address, occupy 2 bytes。
Data length: the length of the data word to be read。
CRC16 check code: high 8 in the front, low 8 in the post, occupy 2 bytes。
Slave response：Address + Command + data + data + CRC check code
1byte + 1byte + 1byte + nbyte + 2byte
Address: in response to the meter address code, the length of 1 byte。
Order: 03H, length is 1 bytes。
Data length: the length of the number to be read.
Data information: read the data, specific see meter parameter address table。
CRC16 check code: high 8 in the front, low 8 in the post, occupy 2 bytes。
6．3．2 Example of communication message：
Read data register (function code 03H): read the current value, the current 100.1A, the instrument a ddress is 1。
Host read data frame：
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address
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command
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Start address (high in front)
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Register number (high in front)
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Check code (high in front)
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01H
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03H
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00H、06H
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00H、02H
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24H、0AH
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Instrument response data frame：
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address
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command
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Data length
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Data segment (4 bytes)
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Check code
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01H
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03H
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04H
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42H、C8H、3DH、5CH
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B4H,CFH
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6．3．3 Modbus communication register address table
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address
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Project description
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data type
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attribute
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explain
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6、7
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Current value (voltage value)
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float
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R
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Meet IEE754 floating point standard
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8
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Open out value
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Short
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R
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Range:1~9999
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IEEE754Data format description
IEEE754Is the use of 4 bytes of binary floating-point numbers to represent a data quantity, the data format and significance are as follows：
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Byte address
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BYTE1
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BYTE2
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BYTE3
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BYTE4
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Floating point content
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SEEEEEEE
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EMMMMMMM
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MMMMMMMM
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MMMMMMMM
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Symbol bit: S=0 is positive, S=1 is negative.。
Index part: order code =E-127。
Mantissa part：=M fill the highest for the mantissa1
Data result：
7.Connection mode and terminal diagram
7．1 Connection mode
Electric current transformer Direct current Voltage input
  
7．2 Terminal diagram
 
Appearance：72X72、80X80、96X96、120X120 Appearance：160X80
 
Appearance: 96X48 Appearance: 48X48
Description: 1, If terminal diagram is different with the actual terminal diagram, please according to the terminal diagram which behind the the product, 2. Ho limit alarm relay output, Lo for lower limit alarm relay output, instrument with only one way relay output, high limit alarm and alarm are through the lower limit alarm relay output.
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