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LT-K96Q Reactive meter

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model

120

1.Product introduction
Intelligent three-phase active power and reactive power 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 set through the instrument key, it is convenient and flexible to use。
Four bright red LED display; option the second road 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。

2.technical parameter

parameter			performance
Signal input	Voltage	range	100V 220V 450V 57.7V, etc.
		overload	Continued:1.2 times, instantaneous:2 times /1S
		Consumption	＜1VA
		impedance	＞380KΩ
	electric current	range	AC 5A/1A
		overload	continued：1.2times，instantaneous：10times/5S
		Consumption	＜1VA
		impedance	＜20mΩ
	frequency		45-65HZ
Auxiliary power supply			Linear power supply： AC220V±5%；power waste＜3VA Switching Mode Power Supply： AC/DC85-265V、DC10-36V；power waste＜3VA
Relay output			Two way output, contact capacity：1A/220VAC；1A/24VDC
Analog output			DC4～20mA
RS485 communication			RS485 communication interface, physical layer isolation, in line with the international standard MODBUS-RTU protocol Baud rate 4800,9600, N81 data format
Precision grade			0.5
Display mode			Digital display: 4 high brightness LED digital tube
Environment			working temperature：-10-55℃；Storage temperature：-20-75℃
security			Insulation: signal, power supply, output terminal to shell resistor > 5M Voltage: signal input, power supply, output between > AC2KV

3. Appearance size and size of opening

3．1Appearance size and size of opening

Exterior code	Exterior dimension(mm)	Opening size(mm)	depth(mm)
A	72×72	67×67	85
3	80×80	76×76	85
9	96×96	91×91	85
2	120×120	111×111	85

4. Panel button operation
4．1 Key definition
Function keys SET: used to enter the menu items, to confirm the set value。
Reduce key ▼：Reducing the number
Add keys▲：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 setting

6.functional module
6．1 Relay alarm output
Relay contact capacity：1A/250VAC，1A/24VDC。

Relay work in, the lower limit alarm, two alarm parameters setting: 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 ohm。
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 protocol 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 + 1byte + 2byte + 2byte + 2byte
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 bytes。
Command: 03H, length is 1 bytes.。
Data length: the length of the data bytes to be sent。
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 power value, the current 100.1W, the instrument address is 1。
Host read data frame：

address	command	Start address (high in front)	Register number (high in front)	Check code (high in front)
01H	03H	00H、09H	00H、02H	14H、09H

Instrument response data frame：

address	command	Data length	Data segment (4 bytes)	Check code
01H	03H	04H	42H、C8H、3DH、5CH	B4H,CFH

6．3．3 ModbusCommunication register address table

address	Project description	data type	attribute	explain
9、10	Power value	float	R	Meet IEE754 floating point standard
8	Open out value	Short	R	Range:1~9999

EEE754Data 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：

Byte address	BYTE1	BYTE2	BYTE3	BYTE4
Floating point content	SEEEEEEE	EMMMMMMM	MMMMMMMM	MMMMMMMM

Symbol bit：S=0 is positive, S=1 is negative.。
Index part：Order code=E-127。
Mantissa part：Mantissa=M up to the highest level of 1
Data result：

7.Connection mode and terminal diagram
7．1 Connection mode
Electric current transformer Direct current Voltage input

7．2 Terminal diagram

Description: 1, If the terminal diagram is different with the actual terminal diagram which at the back of the product, please according to the terminal diagram which is at the back of the product 2, Ho is upper limit alarm relay output, Lo is for lower limit alarm relay output and AO1 analog output.