Yueqing Blue Sky Hi-Tech Co., Ltd.

Home >> Prodcuts List >>Power digital display meter

LT-Z96BR Multifunction meter (RS485)

Related Products

暂无内容

Description	Send Enquiry

model

120

1.Product introduction
This series multi-function network meter is one kind of which can be programmed, display, digital communication and output pulse etc. multi function intelligent instrument to complete the electricity measurement, electrical energy measurement, data display, data acquisition and transmission, widely used in substation automation, distribution automation, intelligent building, enterprise internal electrical energy measurement, management and examination. Realize the scene of the LCD display and remote RS-485 digital interface communication by MODBUS-RTU communication protocol。

2. Technical parameter

performance			parameter
Input voltage display	network		Three-phase three wire, three-phase four wire
	Electric pressure	Rated value	AC100V、400V（Please specify when ordering）
		Over load	continued：1.2times instantaneous：2times/10s
		Consumption	〈1VA（Each phase）
		impedance	〉300kΩ
		accuracy	RMSmeasure，Precision grade0.5，1.0
	Electric current	Rated value	AC1A、5A（Please specify when ordering）
		Over load	continued：1.2times instantaneous：2Times /10s
		Consumption	〈0．4VA（Each phase）
		impedance	〈20MΩ
		accuracy	RMSmeasure，Precision grade0.5，1.0
	frequency		40~60Hz,accuracy0.1Hz
	function		Active power, reactive power, apparent power, power factor
	electric energy		Four phase measurement, active power, reactive power measurement
	display		Programmable, switching, cycle of the 2,3,4 row LCD display
Power Supply	Scope of work		AC220V(default),AC/DC80~265V
	Consumption		≦5VA
output	Digital interface		RS-485、MODBUS-RTU agreement
	Pulse output		2 way electric energy pulse output, Optocoupler
Environment	work environment		-10~55℃
	Storage environment		-20~75℃
security	Pressure		Input and power >2kV, input and output >2kV, power supply and output >1kV
	insulation		Input, output, power supply to casing>5MΩ
appearance	size		size: 12012095mm；969695mm
	weight		0．6kg

3. Installation and wiring

3．1 Meter size

Exterior code	Exterior dimension(mm)	Opening size(mm)	Minimum installation distance		Total length(mm)
Exterior code	Exterior dimension(mm)	Opening size(mm)	level(mm)	vertical(mm)	Total length(mm)
42	120×120	111×111	120	120	80
96	96×96	91×91	96	96	80
80	80*80	76*76	80	80	80
72	72*72	67*67	72	72	80

3．2 Installation method
(1) Open the same hole with opening size on the distribution cabinet；
(2) Take out the instrument, loosen the screw and remove the fixed bracket.；
(3) Meter from the front insert mounting hole；
(4) Insert instrument mounting bracket and screw down the screws.。
3．3Terminal wiring diagram

(Note 1: the size of different wiring methods are the same)
（Note 2: the current line of an asterisk into line, import line, electric energy metering to the inverting power。）

4. Programming operation
4．1 Entry and exit programming status
Enter programming state:
Press “SET”Key 1 seconds when it is in measure display status，Enter password authentication page，use“◄”key,“▲”Key and“▼”Key to put the password (The default user password is 1111)，According to the“SET”Key into the programming status page。Note: if put password and press “SET”Key then exit to measure the display state, that means the input password is not correct。
Exit programming status：
In the programming state, Keep pressing“SET” Key for 2 seconds，Exit the program status, It will prompt the user to choose whether to save the settings，“yes” Save settings，“no” Do not save settings。Press“SET” Key save，Press other key not to save。
4．2 Programming operation in the use of keys
Function key SET：Confirm the setting value, enter the next setting or exit setup。
Bit selection key ◄：Loop to set the LCD screen, the selected figures were flashing。
add keys ▲：Changing the number of blinking bits (LCD screen from 0 to 9)。
Reduce key▼：Changing the number of blinking bits (LCD screen from 9 to 0)。
4．3Set parameter description

Serial number	Content description		display	Range
	Enter menu password		CodE	0~9999
	Note: enter the password to enter the menu, only the correct password to enter the menu, the factory default value of 1111
1	Connection mode	NEt		3P3L、3P4L
	Description: 3P3L three-phase three wire connection method, 3P4L three-phase four wire connection method
2	Voltage ratio	Pt		1~9999
	Description: this setting for the line with the PT ratio, the factory pre set to 1, such as the line with the PT type: 10kV/100V, the setting value is 100
3	Current ratio	Ct		1~9999
	Description: this setting for the line with the CT ratio, the factory pre set to 1, such as the line with the CT type: 600A/5A, the setting value is 120
4	Display mode	diSP		0~99
	Description: 0 for fixed display mode, manual switching display items; 1~99 settings page for automatic switching, set the value of the interval time, unit seconds
5	mailing address	Addr		1~247
	Description: instrument address, multi machine communication for the identification of the machine
6	Baud rate	bAUd		2400、4800、9600、19200、38400
	Note: RS485 is used to set the communication baud rate, factory default value is 9600
7	Communication data format	dAtA		n.8.1、o.8.1、e.8.1、n.8.2
	Description: n.8.1 no parity bit 1 data bits 8 stop bits, o.8.1 odd parity 8 data bits 1 stop bits, e.8.1 parity check 8 data bits 1 stop bits, n.8.2 no parity bit 8 data bits 2 stop bits
8	Electric energy clear 0	Eclr		yes、no
	Description: Yes electric energy data 0, no electric energy data unchanged
9	Save parameter modification value selection	SAVE		yes、no
	Note: Yes save the parameters of the modified value, no before the parameter values unchanged
17	Menu entry password	Code		0~9999
	Note: set the password to enter the menu, the default password is 1111
18	Backlight time setting	Bogl		0~250
	Description: 0 for the backlight often bright, 1-250 set the page for the backlight display of time, unit of second. Ex factory preset to 60

5.Panel description and measurement information display

6. Functional module
6．1 RS485communication
6．1．1 physical layer
(1) RS485 Communication interface, asynchronous half duplex mode。
(2) 2400,4800,9600,19200,38400 BPS communication baud rate can be set, the factory default value is 9600 BPS。
(3) Byte transfer format: N81 no parity bit 1 data bits 8 stop bit, O81 odd parity 8 data bits 1 stop bits, E81 parity check 8 data bits 1 stop bits, N82 no parity bit 8 data bits 2 stop bits。
6．1．2 communication protocol Modbus-RTU
This instrument provides serial asynchronous half duplex RS485 communication interface, using standard MODBUS-RTU protocol, all kinds of data and information can be found in the communication line transmission. In the same line it can connect up to 64 network instrument, each network meter can set the address and communication even collusion with copper net shielded twisted pair, wire diameter not less than wiring 0.5mm2. should enable communication line away from the high voltage cable, or other strong electric field environment, recommended the use of the T type network connection, does not recommend the use of a star or other connection。
So the terminal devices do not initialize them interchange, between the terminal equipment Modbus Protocol in a communication line using master-slave response mode of communication link. First of all, the main computer signal is addressed to only allowing communication between the host (PC, PLC, etc.) and the terminal equipment of a unique address terminal equipment (slave), then sent the terminal unit send the response signal transmission which in the opposite direction to the host, that is : in a single communication line signal along the opposite direction of transmission all communication data flow (half duplex mode) protocol.MODBUS without allowing independent data Occupy the communication line, but only in response to the query signal to reach the machine。

Host queries: query message frame including device address, code and data information code, check code. Address code that is selected from machine equipment; functional code tell is selected from the device to perform what function, such as function code 03 and 04 is requirements from the device reads the register and return to their contents; data segment contains from the device to perform the function of any additional information, check code used to test the correctness of a frame of information, from the device provides a validation message content to check the correctness of the method, which adopts CRC16 calibration rules。
From the machine response: if it get normal response from the device, in response to the news is from the machine address code, function code, data information code and CRC16 checksum code. Data information code include from equipment to collect data, such as register values or states. If an error occurs, we agreed is from the machine does not respond。
We define the communication data format used in this instrument: the bit of each byte (1 start bits, 8 data bits, odd parity check or parity check, no check, 1 or 2 stop bits).。 Data frame structure, namely message format：

Device address	Function code	Data segment	CRC16 check code
1 byte	1 byte	Byte N	2 byte

Device address: by a byte, in our system, only use 1~247, other address reservation. The address of each terminal device must be unique, only to be addressed to the terminal will respond to the corresponding query。
Function code: tells the address of the terminal to perform which function. The following table lists the series of instruments supported by the functional code, as well as their functions。

Function code	function
03H/04H	Read the values of one or more registers
10H	Write the value of one or more registers

Data segment: data that contains the data required to perform a specific function or terminal response to a query. The contents of these data may be numeric, reference, or set values.。
Check code: CRC16 occupied two bytes, contains a 16 bit binary ,CRC value calculated by the transmission equipment. and then attached to the data frame, receiving equipment recalculates CRC value again when receiving data, then compares the value with the received CRC domain, if the two values are not equal, error occurs。
The process for generating a CRC16 is：
(1) Preset a 16 bit register to 0FFFFH (1), called the CRC register。
(2) The low byte of the first byte in the data frame of the 8 bit CRC register with the XOR operation, the result is stored back into the CRC register。
(3) The CRC register to the right one, the high fill to 0, the lowest detection and removal.
(4) If the least significant bit to 0: repeat the third step (a time shift); if the least significant bit to 1: CRC register and a preset fixed value (0A001H) is XORed with the。
(5) Repeat the third step and the fourth step until the 8 shift. This process is done with a full eight bit.。
(6) Repeat the second step to the fifth step to process the next eight bits, until all the byte processing ends。
(7) The value of the final CRC register is the value of the CRC16.。
6．1．3 Example of communication message：
(1) Read data register (function code 03H/04H): read the three-phase current value, A phase current 5.000A, B phase current 4.996A, C phase current 4.980A, the instrument address is 1。
Host read data frame：

address	command	Start address (high in front)	Register number (high in front)	Check code (low in front)
01H	04H	00H,1AH	00H,03H	91H,CCH

Instrument response data frame：

address	command	Data length	Data segment (6 bytes)	Check code
01H	04H	06H	13H,88H,13H,84H,13H,74H	CBH,95H

(2) Write data register (code 10H): set the current ratio of CT=300, voltage ratio of PT=100 is 1 meters.。
Host write data frame：

address	command	Start address	Register number	Number of bytes	Data segment	Check code
01H	10H	00H,02H	00H,02H	04H	00H,64H,01H,2CH	33H,E4H

Instrument response data frame：

address	command	Start address	Register number	Check code
01H	10H	00H,02H	00H,02H	E0H,08H

6．1．4 Modbus Communication register address table

Add.	Project description	data type	attribute	explain
0	Enter menu password	Int	R/W	Range:0~9999
1	Electric parameter display mode	Int	R/W	See menu setting for this description
1	Input signal connection mode	Int	R/W	0:Three-phase three wire，1:Three-phase four wire
2	The voltage ratio of PT	Int	R/W	Range:1~9999
3	The current ratio of CT	Int	R/W	Range:1~9999
4	retain
5	mailing address	Int	R/W	Range:1~247
5	Baud rate	Int	R/W	0:2400bps~4:38400bps
6	Communication data format	Int	R/W	0:N81、1:O81、2:E81、3:N82
7~19	retain
20	A phase voltage	Int	R	See additional instructions
21	B phase voltage	Int	R	See additional instructions
22	C phase voltage	Int	R	See additional instructions
23	AB phase voltage	Int	R	See additional instructions
24	CA phase voltage	Int	R	See additional instructions
25	BC phase voltage	Int	R	See additional instructions
26	A phase current	Int	R	See additional instructions
27	B phase current	Int	R	See additional instructions
28	C phase current	Int	R	See additional instructions
29	Power factor, power factor	Int	R	See additional instructions
30	A phase active power	Int	R	See additional instructions
31	B phase active power	Int	R	See additional instructions
32	C phase active power	Int	R	See additional instructions
33	Psum	Int	R	See additional instructions
34	Reactive power of A phase	Int	R	See additional instructions
35	Reactive power of B phase	Int	R	See additional instructions
36	Reactive power of C phase	Int	R	See additional instructions
37	Total reactive power	Int	R	See additional instructions
38	A looked at each other in power	Int	R	See additional instructions
39	B looked at each other in power	Int	R	See additional instructions
40	C looked at each other in power	Int	R	See additional instructions
41	Total apparent power	Int	R	See additional instructions
42	A phase power factor	Int	R	See additional instructions
43	B phase power factor	Int	R	See additional instructions
44	C phase power factor	Int	R	See additional instructions
45	Total power factor	Int	R	See additional instructions
46	frequency	Int	R	See additional instructions
47~48	Positive active energy (integer part)	Long	R/W	See additional instructions
49	Positive active energy (decimal part)	Int	R/W	See additional instructions
50~51	Be responsible for work (part of)	Long	R/W	See additional instructions
52	Be responsible for the power (decimal part)	Int	R/W	See additional instructions
53~54	Inductive reactive power (integral part)	Long	R/W	See additional instructions
55	Inductive reactive power (decimal part)	Int	R/W	See additional instructions
56~57	Capacitive reactive power (integral part)	Long	R/W	See additional instructions
58	Capacitive reactive power (decimal part)	Int	R/W	See additional instructions

NOTE：
(1) Readout voltage is secondary side voltage value, fixed 1 decimal digits, secondary side voltage value = readout value per 100000, a primary side voltage value = readout value * Pt ratio.。
(2) The readout current is the secondary side of current value, fixed 3 decimal digits, the secondary side of current value = readout value per 1000, a primary side current value = readout value x CT ratio per 1000。
(3) Power and power factor of sign bit register, low byte bit BIT0, Bit1 and BIT2, BIT3, BIT4, bit 5. BIT6, BIT7 respectively said phase a active, B - phase active, C phase active power, active power, a phase reactive B reactive power, C reactive power, symbol of total reactive, 1 negative, 0 indicating positive. High byte bit BIT0, Bit1 and BIT2, BIT3 respectively said power factor of phase a, B phase power factor, C phase power factor and total power factor of the inductive or capacitive, perceptual representations, 1 said capacitive。
(4) Readout power is the secondary side of the power value, fixed decimal digit, the secondary side of power value = readout value per 100000. A side power value = readout value * Pt ratio x CT ratio.。
(5) Frequency fixed 2 decimal digits, frequency value = read out value /100。
(6) Energy value composed by three register (Word0, Word1, Word2), the first two registers composed a long integer, which means the integer part of the value. The next register composition a integer, It is decimal value, Energy value =Word0 * 0x10000 + Word1 + word2/1000。
6．2 Electric energy measurement and electric energy pulse output
Multifunction power meter can provide bidirectional active power, bi-directional power energy metering, 2 circuit pulse output function and RS485 digital interface to accomplish the electric energy data display and remote transmission. Collector open optocoupler relay electric energy pulse realization of active electric energy and non energy remote, the remote computer terminal, PLC, di switch acquisition instrument of pulse number to implement cumulative metering. The output power of precision test way is (national measurement procedures: standard meter pulse error comparison method）。
(1) Electrical characteristics: In the drawing of the pulse collecting output interface ofcircuit diagram VCC≤48V、Iz≤50mA 。

(2) Pulse constant: 3600 imp/kWh; when the accumulated instrument of 1kwh pulse output the number of N=3600, needs to be emphasized is 1kwh electricity secondary electrical measurement data, In the Pt, CT condition, the relative N number of pulse data corresponding to 1 times the measured electric to 1kwh * voltage Pt ratio x current CT ratio。
(3) Application example: PLC terminal using pulse counting device，It is assumed that during the time is T , collect pulse number is N, input：10kV/100V，400A/5A，In this period, the meter electric energy accumulation is：N/3600×100×80 Degree electric energy。