PD668E-3S4Y Long term three-phase LCD multifunctional instrument (Black/White)

Product Introduction

1. Reference standards

• Reference national standards:

  DL/T614-1997 Multifunctional Energy Meter

  GB/T17883-1999 0.2S and 0.5S Static AC Active Energy Meters GB/T17882-1999 Level 2 and Level 3 Static AC Reactive Energy Meters

  GB/T13850-1998 Electrical measurement transmitters for converting AC electrical quantities into analog or digital signals

  
  

• Quoting international standards

  IEC62053-22: 2003 Electricity Measurement Equipment (AC) - Special Requirements - Part 22: Static Energy Meters (Class 0.2S and 0 5S level)

  IEC62053-23:2003 Electricity Measurement Equipment (AC) - Special Requirements - Part 23: Static Reactive Power Meters (Class 0.2S and 0 5S level)

  IEC61010-1: 2001 Safety requirements for electrical equipment for measurement, control and laboratory use - Part 1: General requirements

  IEC61000-2-11 Electromagnetic Compatibility (EMC) - Part 2-11

  IEC60068-2-30 Environmental Testing - Part 2-30

2. Product Overview

• Multi functional network power meters are designed and manufactured specifically for the power monitoring needs of power supply and distribution systems It can measure all commonly used electrical parameters with high accuracy, such as three-phase voltage, three-phase current, active power, reactive power, frequency, power factor, four quadrant electrical energy, etc. At the same time, it also has functions such as energy accumulation, energy pulse output, over limit alarm, switch input and output, analog transmission output, and network communication, with a good human-machine interface.

• Multi functional network power meters have extremely high cost-effectiveness and can replace conventional measurement indicators, energy meters, multifunctional power meters, and related auxiliary units. As an advanced intelligent and digital front-end acquisition component for the power grid. This instrument can be applied to various control systems, energy management systems, substation automation, distribution network automation, industrial automation, and can only be used in buildings, intelligent distribution panels, and switchgear. It has the characteristics of easy installation, simple wiring, easy maintenance, small engineering quantity, and on-site input parameter setting. Capable of networking different PLCs and industrial control computer communication software in the industry.

Main functions of the product

1. Common functions

• Three phase voltage: UA, UB, UC

• Three phase line voltage: UAB, UBC, UCA

• Three phase current: IA, IB, IC

• Active power: active power per phase and total active power

• Reactive power: reactive power per phase and total reactive power

• Apparent power: apparent power per phase and total apparent power

• Power factor: power factor per phase and total power factor

• grid frequency

• active energy

• Reactive energy

• 2-channel power pulse output

• Communication output: RS485

2. Additional features

• 4-channel analog output

• 4-channel switch output

• 4-channel switch input

Technical Specifications

Programming and usage

1. Panel Description

2. Key Function Description

• Left shift key:

  In programming mode, it is used to flip up menu items when selecting them; Used to decrease parameter values when modifying them; In the measurement display state, press this key to flip up the display interface.

  
  

• Right shift key:

  In programming mode, it is used to scroll down menu items when selecting them; Used to increment parameter values when modifying them; In the measurement display state, press this key to scroll down the display interface.

  
  

• Menu key:

  In the measurement display state, press this key to enter programming mode, and the instrument prompts for the input of password (CodE), with the initial password being 0001; After entering the correct password, the instrument can be programmed and set up; In programming mode, it is used to return to the previous menu.

  
  

• Confirm key:

  In programming mode, select and confirm, and return to the previous menu; When returning to measurement mode in programming mode, the instrument will prompt "SAVE - YES", select the OK key to save and exit programming mode.

3. Display Method Description

By programming the "diSP" parameter in the menu, you can choose one of the 7 display modes, or manually switch the display mode by pressing the left or right arrow keys DiSP value display method: 1. Three phase current, frequency, positive active energy; 2: Three phase voltage, frequency, positive reactive power; 3: Three phase active power, total active power, negative active energy; 4: Three phase power factor, total power factor, negative reactive energy; 5: Three phase apparent power, total apparent power, switch input and output; 6: Three phase reactive power, total reactive power, positive active energy.

Note:

• 1. Press the left and right arrow keys to view the battery information on different pages.

• If the page display value diSP is set to 0, each page will be automatically displayed in a loop, with a page switching time of 5 seconds.

display mode DiSP parameter values	content	Instructions
diSP=1		Display three-phase current values The left image shows: A-phase current value: 5.200A B-phase current value: 5.197A C-phase current value: 5.198A Grid frequency value: 50.00Hz Positive active energy value: 0.09Kwh
diSP=2		Display three-phase voltage values: The left image shows: A-phase voltage value: 220.1V B-phase voltage value: 220.0V C-phase voltage value: 220.3V Grid frequency value: 50.00Hz Positive reactive power value: 0.02Kvarh Current wiring method: Wiring method You can check the voltage value of the three-phase line according to the confirmation document
diSP=3		Display three-phase active power values: The left image shows: A-phase active power value: 1.100KW B-phase active power value: 1.100KW C-phase active power value: 1.100KW Total active power value: 3.300KW Negative active energy value: 0.09Kwh
diSP=4		Display three-phase power factor values: The left image shows: A-phase power factor value: 1.000 B-phase power factor value: 1.000 C-phase power factor value: 1.000 Total power factor: 1.000 Negative reactive power value: 0.02Kvarh
diSP=5		Display three-phase apparent power values: The left image shows: A-phase apparent power value: 1.100KW B-phase apparent power value: 1.100KW C-phase apparent power value: 1.100KW Total apparent power value: 3.300KW 00000000 (switch quantity) First four digits: switch output (0: off, 1: on) Last four digits: switch input (0: off, 1: on)
diSP=6		Display three-phase reactive power values: The left image shows: A-phase reactive power value: 0.000Kvarh B-phase reactive power value: 0.000Kvarh Reactive power value of phase C: 0.000Kvarh Total reactive power value: 0.000Kvarh Positive active energy value: 0.09Kwh

4. Menu Structure

5. Menu Description

In programming mode, the instrument provides six categories of menu settings: settings (SEt), input (inPt), communication (Conn), switch output (do1-4), analog output (Ao1-4), and password modification (CodE). It adopts a hierarchical single structure management method with LCD display: the first row displays the first layer menu; The second row displays the second layer menu; The third row displays parameter values.

Menu parameter description

First layer menu	2nd layer menu	parameter value	Instructions
		0~9999	It can only be done when the programming password entered is correct Enter programming mode (initial password: 0001)
		0~6	Select the current page for displaying measurements' diSP '
		1~15	Adjust LCD display brightness, 15: Brightest
		End	After confirmation, reset the electrical energy to zero
		n.3.4 n.3.3	Select the signal network 'nEt', n. 3.3: Three phase three wire n. 3.4: Three phase four wire
		400V 100V	Choose the range for measuring voltage signals: 400V or 100V
		5A/1A	Choose the range for measuring current signals: 5A or 1A
		1~9999	Set the voltage signal transformation ratio to 1 voltage value/2 voltage values Example: 10KV/100V=100
		1~9999	Set the current signal ratio to 1 current value/2 current values Example: 300A/5A=60
		1~247	Instrument communication address range
		nine thousand and six hundred four thousand and eight hundred two thousand and four hundred one thousand and two hundred	Select communication baud rate "bAud": 120024004800 or 9600
		n.8.1 o.8.1 E.8.1	communication protocol n. 8.1: n-No checksum, 8-8 data bits, 1-1 stop bits o. 8.1: o-Odd check, 8-8 data bits, 1-1 stop bits E. 8.1: E-even verification, 8-8 data bits, 1-1 stop bits
	0~255	0~9999	Select any item from the measured power parameters and The upper and lower limit items of its alarm are input through the judgment of the DO module Corresponding switch on/off signal.
	0~255	0~9999	Select any item in the measured power parameters and its Output the corresponding value at full scale, and after being collected and calculated by the AO module, output it.
		0~9999	Current password
		0~9999	Enter new password for the first time
		0~9999	Enter new password for the second time

6. Programming Operation Example

allWhen using the instrument for the first time, please check whether the parameters of the instrument are consistent with the parameters in the distribution coefficient where it is located. The labels behind the instrument indicate the factory settings of the instrument; If there is inconsistency, the internal parameters of the instrument can be modified by the four buttons on the panel to meet the requirements of the power distribution system

• Set the display mode from diSP=1 (three-phase current value) to diSP=4 (three-phase power factor value)

  
  

  
  

• Change the input signal network from three-phase four wire to three-phase three wire, input voltage 10KV/100V, input current 300A/5A

  
  

  
  

• Modify instrument communication parameters: instrument address code is 10, baud rate is 9600, data format is 8 data bits, 1 stop bit, even check method.

  
  

Installation and wiring

1. Appearance and installation hole size

2. Installation method

• Power supply: The working voltage range of the instrument is AC/DC 85-265V. To prevent damage to the instrument, it is recommended to install a 1A fuse on the live side when using AC power. In areas with poor power quality, it is recommended to install surge suppressors and fast pulse group suppressors in the power circuit.

  
  

• Electricity signal input (current input and voltage input): The current input is a three-phase AC current signal input terminal of A, B, C, where I * is the current input terminal; The voltage input is a three-phase AC voltage signal input terminal consisting of A, B, and C. Please ensure that the phase sequence and polarity of the input signal correspond one-to-one with the terminals when wiring. The input voltage should not exceed the rated input voltage of the product, otherwise PT should be considered, and a 1A fuse must be installed at the voltage input end; The input current should not exceed the rated input current of the product, otherwise an external CT should be considered. The input network n Et set in the instrument wiring and programming should be consistent with the wiring method of the measured load.

  
  

• Power pulse output: P+is the active power pulse output+terminal, Q+is the reactive power pulse output+terminal, P-Q - is the active/reactive power pulse output - terminal, the output method is optocoupler output with open collector, open collector voltage VCC ≤ 48V, current Iz ≤ 50mA. The output of electrical energy pulses corresponds to the secondary side data. When calculating the primary side electrical energy, it is necessary to multiply it by the voltage transformer multiplier PT and the current transformer multiplier CT to obtain the primary side data.

  
  

• RS485 communication wiring

  The instrument provides an RS485 communication interface and adopts the MODBUS-RTU communication protocol (see appendix). Up to 32 instruments can be connected simultaneously on a communication line, and each instrument should have a unique communication address within the line. The communication connection should use shielded twisted pair cables with copper mesh, and the wire diameter should not be less than 0 5mm. When wiring, the communication line should be kept away from strong electrical cables or other strong electric field environments, with a maximum transmission distance of 1200 meters. The typical network connection method is shown in the following figure, and users can choose other suitable connection methods according to specific situations.

  
  

• Switching input (DI input): DI1~DI4 are 1-4 passive dry contact input terminals, and the instrument comes with a built-in+5V power supply.

  
  

  
  

• Switching output (Do1~Do4) or analog transmission output (Ao1~Ao4): The instrument can support 4 switching output or 4 analog transmission output (corresponding functional modules need to be installed)

MOBUS-RTU communication protocol

1. The instrument provides RS485 communication interface and adopts MODBUS-RTU communication protocol

2. Communication information transmission process

When a communication command is sent from the host to the slave, the slave that matches the address code sent by the host receives the communication command. If the CRC check is correct, the corresponding operation is performed, and then the execution result (data) is returned to the host. The returned information includes the address code, function code, executed data, and CRC check code. If the CRC check fails, no information will be returned.

• address code

  The address code is the first byte of each communication information frame, ranging from 1 to 247. Each slave must have a unique address code, and only the slave that matches the address code sent by the host can respond to the echo message. When the slave sends back information, the returned data starts with their respective address codes. The address code sent by the host indicates the address of the slave to be sent, while the address code returned by the slave indicates the address of the slave to be sent back. The corresponding address code indicates where the information comes from.

  
  

• function code

  The second byte of each communication information frame. The host sends a function code to tell the slave what action should be performed. The slave responds by returning the same function code as the one sent from the host, indicating that the slave has responded to the host and performed the relevant operation.
  The instrument supports the following function codes:

  function code	definition	operation
  03H	Read register	Obtain the current binary value of one or more registers

data area

The data area varies depending on the function code. These data can be numerical values, reference addresses, etc. For different slaves, the address and data information are not the same (a communication information table should be provided).

The host can read and modify instrument data registers freely using communication commands (function code 03H), and the length of data read at once should not exceed the valid range of data register addresses.

3. The process of generating a CRC is as follows:

• Pre set a 16 bit register (hexadecimal, all 1s), called the CRC register;

• XOR the first byte of the data frame with the low byte in the CRC register, and store the result back in the CRC register.

• Move the CRC register to the right by one bit, fill the highest bit with 0, move the lowest bit out and check.

• If the one removed in the previous step is 0, repeat the third step (next time): 1; XOR the CRC register with a preset fixed value (0A001H);

• Repeat steps three and four until 8 shifts are made, thus completing a complete 8-bit process;

• Repeat steps two to five to process the next eight bits until all byte processing is complete;

• The final value of the CRC register is the value of the CRC

4. MODBUS_STU Address Information Table (addresses are represented by decimal numbers)

Note: IEEE-754 uses 4-byte binary floating-point numbers to represent a data battery level, and its data format and meaning are as follows:

• Sign bit: SIGN=0 is positive, SIGN=1 is negative;

• Index section: E=Index section -126;

• Tail part: M=The tail part is supplemented with the highest digit as 1;

• Data result: REAL=SIGN × 2E × M/(256 × 65536)

• For example, when the host reads energy data, it can be seen from the address table that the energy (positive active absorption) address is: (byte format, compatible with old standards) 92 (005CH), length 4 (0004H)

• Host: 01H 04H 00 5CH 00 04H 31 DBH

• Slave: 01 04H 04H 50 80 00 00 H EBH 6CH, where 50 80 00 00 00 is active energy (absorption) data, EBH, 6CHCRC16 low and high bits

• Its size: SIGN (sign bit=0, positive), index EX=A1H-126=35, tail number: 08 00 00H

• Result: 235 × 80.00 00H/100 00H=17179869184Wh=17179869KWh

5. Example of Communication Messages

Read the three-phase current value from the slave machine with terminal device address 1 (01H).

• Query data frame (host)

  address	command	Starting register address (high-order)	Starting register address (low bit)	Number of registers (high bits)	Number of registers (low order)	CRC16 (low position)	CRC16 (high position)
  01H	03H	00H	45H	00H	06H	D4H	1DH

  
  

• Response data frame (host)

  address	command	data length	Data 1-12	CRC16 (low position)	CRC16 (high position)
  01H	03H	0CH	43556680H, 43203040H, 42DDCC80H	B5H	DBH

  Indicating: IA=43556680H (213.4A), IB=4320300H (160.1A), IC=42DDCC80H (110.8A)

Electric energy pulse and pulse output

The multifunctional power meter provides active and reactive energy measurement, with 2-channel power pulse output function and RS485 digital interface to display and transmit power data remotely. Display of active energy (positive) and reactive energy (inductive) measurement data on a 10 digit LCD instrument panel; The electric energy pulse (resistance signal) of the optocoupler relay with open collector realizes the remote transmission of active energy (forward) and reactive energy (reverse). The remote computer terminal, PIE, and DI switch acquisition module are used to collect the total number of pulses from the instrument to achieve the accumulation and measurement of electric energy. Whether to use output method or precision testing method for electrical energy (National Metrology Regulations: Pulse Error Ratio Method for Standard Meters).

• Electrical characteristics: collector open circuit voltage VCC ≤ 48V, current Lz ≤ 50mA.

  
  

• Pulse constant: 3200imp/KWh. Its meaning is that when the instrument accumulates 1KWh, the number of pulse outputs is 3200. It should be emphasized that 1KWh is the data of two electrical energy measurements. In the case of PT and CT, the relative N pulse data correspond to one electrical energy measurement of 1KWh × PT × CT.

  
  

• Application example: The PLC terminal uses a pulse counting device. Assuming that N pulses are collected during a period of time with a length of T, and the instrument input is 10KV/100V, 400A/5A, the accumulated electrical energy of the instrument during this period is N/3200 × 100 × 80 kWh

  
  

Switching module section

The network instrument provides 4-channel switch input function and 4-channel switch output function of optocoupler relay. The 4-channel switch input adopts the dry node resistance switch signal input method. When the external is connected, the module DI for instrument switch input collects the connection information and displays it as 1; When the external is disconnected, the instrument switch output module DI collects the disconnection information and displays it as 0. The switch input module can not only collect and display local switch information, but also achieve remote transmission function through the RS485 digital communication interface of the instrument, that is, the "remote signaling" function. The switch output function of 4-channel optocoupler relay can be used for alarm indication, protection control and other output functions in various places. When the switch output is valid, the relay output is turned on, and when the switch output is turned off, the relay output is turned off.

Electrical parameters: Input DI: Connect resistance R<360 Ω; Turn off resistance R>100K Ω, output DO: AC 250V, 0.1A;

Register: DIO Information Register: This register represents the status information of 4 switch inputs and 4 switch outputs.

The lower 4 bits (BIT3, BIT2, BIT1, BIT0) of the DIO register represent the status information of the switch input. If the register content is 0000 0101, it indicates that there are 3 switch input terminals, with 1 being off, 4 being on, and 2 being on.

The high 4 bits (BIT7, BIT6, BIT5, BIT4) of the DIO register are switch output status information. If the register content is 1101 0000, it indicates that ports 9 and 10, 7 and 8, 3 and 4 are conductive, 5 and 6 are off, and all DIO information can be displayed on the instrument's LCD.

Each switch alarm output parameter is stored using DOSi-3 consecutive address spaces. The first path uses three bytes with addresses of 10, 11, and 12 for storage. The lowest byte of the address (address 10) stores the parameters of the alarm output object, such as UA's low alarm parameter being 1 and high alarm parameter being 129; 0 represents remote control mode. The other two bytes (addresses 11, 12) are alarm limit parameters. The other three routes are similar to this. The corresponding address space can refer to the address list.

Application examples

• Switching input function:

  The switch module has a 4-channel switch input acquisition function. After collecting the input signal, the LCD of the instrument panel displays its "-1 on" or "-0 off" information for local monitoring of the switch signal. Switch the instrument to the display state of switch information, and the last four digits of the LCD on the bottom layer of the panel will display the switch input status information. From left to right, they are the first, second, third, and fourth channels. The information from the switch information register can be transmitted to a remote computer terminal through the RS485 digital interface of the instrument.

  As shown in the figure, it indicates that the 4th, 3rd, and 1st channels are in a conducting state, while the 2nd channel is in an off state.

  

  
  

• Switching output function:

  Remote control function: By writing control information to the DIO information register through the upper computer, it can control the on/off of 4 switch output ports. Writing 1 corresponds to the port being turned on, and writing 0 corresponds to the port being turned off. If the binary number 10110000 is written, it means that the 1st, 2nd, and 4th switch output ports are conductive, and the 3rd port is disconnected. This function cannot be used in conjunction with another over limit alarm output function of the switch module. To use the remote control function, the battery object parameter needs to be set to 0, which means the alarm output function is turned off. When setting the switch output function, the second line parameter of the instrument should be set to 0.

  The above figure shows that the first and fourth channels are in the off state, while the second and third channels are in the on state.

  Another function of the switch output module is to output out of limit alarms. Set the range of electrical parameters. When the measured electrical parameters exceed the set range, the corresponding switch output port will be in a conductive state, and the corresponding position on the panel will display 1. When the signal returns to the parameter range, the display will change to 0. The DOSi (3 bytes) inside the instrument is a switch value setting register, which can be used to set alarms by writing parameters through the instrument's communication interface; You can also directly set the alarm object and alarm value through the panel button operation.

  
  

  Programming example: For a 10KV/100V, 400A/5A instrument, setting DO1 as UA>11KV alarm, DO2 as IA>400A alarm, DO3 as PF<0.9 alarm, DO4 as F>51.00Hz alarm, the control word should be written as:

  category	alarm condition	Control word (high byte first)
  		BYTE2	BYTE1	BYTE0
  Switching output 1	UA>11KV	128+1=129	1100(04H4CH)
  Switching output 2	IA>400A	128+7=135	4000(0FHA0H)
  Switching output 3	PF<0.90.9<	twenty-one	900(03H84H)
  Switching output 4	F>51.00Hz	128+26=154	5100(13HECH)

  
  

  The switch value setting parameter DOI can also be programmed through the keyboard. In programming operations, the parameter values in the DOSi menu item are the corresponding DOI related parameters. Right figure: The display of do -1 in the first row indicates that the set item is switch output module 1; The second line displays 0007 as the selected alarm power item, 7: IA low alarm; The third line displays 2000 as the alarm interval. When IA<2000, DO 1 outputs an alarm signal, indicating that the relay is conducting.

  

  
  

  Comparison Table of Switching Output and Transmission Output Power Parameters

  project	Discrete output		transmitter output
  	Corresponding parameters (low alarm)	Corresponding parameters (high alarm)	Corresponding parameters (0-20mA)	Corresponding parameters (4~20mA)
  UA (A-phase voltage)	one	one hundred and twenty-nine	one	one hundred and twenty-nine
  Ub (B-phase voltage)	two	one hundred and thirty	two	one hundred and thirty
  Uc (C-phase voltage)	three	one hundred and thirty-one	three	one hundred and thirty-one
  Uab (AB line voltage)	four	one hundred and thirty-two	four	one hundred and thirty-two
  Ubc (BC line voltage)	five	one hundred and thirty-three	five	one hundred and thirty-three
  UcA (CA line voltage)	six	one hundred and thirty-four	six	one hundred and thirty-four
  IA (A-phase current)	seven	one hundred and thirty-five	seven	one hundred and thirty-five
  Ib (B-phase current)	eight	one hundred and thirty-six	eight	one hundred and thirty-six
  Ic (C-phase current)	nine	one hundred and thirty-seven	nine	one hundred and thirty-seven
  PA (active power of phase A)	ten	one hundred and thirty-eight	ten	one hundred and thirty-eight
  Pb (B-phase active power)	eleven	one hundred and thirty-nine	eleven	one hundred and thirty-nine
  Pc (C-phase active power)	twelve	one hundred and forty	twelve	one hundred and forty
  Ps (total active power)	thirteen	one hundred and forty-one	thirteen	one hundred and forty-one
  QA (A-phase reactive power)	fourteen	one hundred and forty-two	fourteen	one hundred and forty-two
  QB (B-phase reactive power)	fifteen	one hundred and forty-three	fifteen	one hundred and forty-three
  Qc (C-phase reactive power)	sixteen	one hundred and forty-four	sixteen	one hundred and forty-four
  Qs (total reactive power)	seventeen	one hundred and forty-five	seventeen	one hundred and forty-five
  PFA (A-phase power factor)	eighteen	one hundred and forty-six	eighteen	one hundred and forty-six
  PFb (B-phase power factor)	nineteen	one hundred and forty-seven	nineteen	one hundred and forty-seven
  PFc (C-phase power factor)	twenty	one hundred and forty-eight	twenty	one hundred and forty-eight
  PFs (total power factor)	twenty-one	one hundred and forty-nine	twenty-one	one hundred and forty-nine
  Sa (apparent power of phase A)	twenty-two	one hundred and fifty	twenty-two	one hundred and fifty
  Sb (apparent power of phase B)	twenty-three	one hundred and fifty-one	twenty-three	one hundred and fifty-one
  Sc (apparent power of phase C)	twenty-four	one hundred and fifty-two	twenty-four	one hundred and fifty-two
  Ss (total apparent power)	twenty-five	one hundred and fifty-three	twenty-five	one hundred and fifty-three
  F (frequency)	twenty-six	one hundred and fifty-four	twenty-six	one hundred and fifty-four

  Alarm parameter calculation method:

  Calculation of the alarm limit value for power parameters: Take the most significant digit of the range value to obtain a parameter ratio of one integer. The ratio of the alarm value to the range value is equal to the ratio of the set value to the reference value.

  

  
  

  If the instrument is 400V, 800A/5A

  Set requirements	alarm condition	range value	Reference value	Programming parameter settings
  				Corresponding parameters of electricity quantity	set value
  Voltage alarm	UA>400V	four hundred	four thousand	one hundred and twenty-nine	four thousand
  	UB>430V			one hundred and thirty	four thousand and three hundred
  	Uc<80v80v<			three	eight hundred
  Current alarm	IA>800A	eight hundred	eight thousand	one hundred and thirty-five	eight thousand
  	IB<400a400a<			eight	four thousand
  	Ic<70a70a<			nine	seven thousand
  Power alarm	PA>320KW	320K	three thousand and two hundred	one hundred and thirty-eight	three thousand and two hundred
  	Ps>980KW	960K	nine thousand and six hundred	one hundred and forty-one	nine thousand and eight hundred
  	Ps<560kw560kw<			thirteen	five thousand and six hundred
  Power factor alarm	PFA>0.866	one	one thousand	one hundred and forty-six	866
  	PFS>0.9			one hundred and forty-nine	nine hundred
  	PFS<0.50.5<			twenty-one	five hundred

  
  

Analog quantity transmission output module

The network instrument provides 4 analog transmission output functions, and each channel can select any one of the 26 power parameters for setting. Through the analog transmission module function of the instrument itself, the analog transmission output function of the power parameters (0~20mA/4~20mA) can be achieved, and the corresponding relationship can be set arbitrarily.

• Electrical parameters: Output 0~20mA, 4~20mA

• Accuracy level 0.5;

• Overload: 120% effective output, maximum current 24mA, voltage 16V; load: Rmax=400 Ω

Register: Each transmission output parameter is stored using A O i -3 consecutive address spaces. The first path uses three bytes of addresses 22, 23, and 24 (BYTE2, BYTE1, BYTE0) for storage. The lowest byte of the address (address 22) stores the parameters of the transmission output object, such as UA's 0-20mA transmission parameter being 1, and 4-20mA transmission parameter being 129; The other two bytes (addresses 23 and 24) are parameters for transmitting output 20mA. The other three routes are similar to this. The corresponding address can refer to the address list.

AOSi control words can be set through computer and instrument panel buttons to achieve the setting of 4-channel analog transmission outputs, including selecting the power items to be transmitted and the corresponding power parameters for the full range 20mA output.

Application examples

For instruments with 10KV/100V and 400A/5A settings: AO1-UA: 0~10KV/4~20mA; AO2-IA: 0~400A/4~20mA; AO3-PS: 0~12MW/0~20mA;  AO4-QS: 0~12MVar/0~20mA;

Calculation of output parameter values for power parameter transmission: Take the highest 4 significant digits of the range to obtain a 4-digit integer parameter ratio. The ratio of the transmission value to the range value is equal to the ratio of the set value to the parameter value.

Note: When there is an error in the transmission value, the size of the set value can be modified accordingly based on the magnitude of the error.

If the instrument is 400V, 800A/5A

The transmission output setting parameter AOSi (3BYTE) can also be set through panel buttons. In programming operations, the AOSi menu item is the transmission module parameter setting parameter. In the parameter setting on the right figure, programming item AO-1: Transmission output first channel; 0129=128+1: Select the power project UA as the 4-20mA transmission output, and the voltage corresponding to 20mA is 10KV, set to 1000

For example, in a 10KV/100V network, it is necessary to complete the transmission output circuit 1 and UA: 0~10KV/4~20mA transmission output function.

Common problems and solutions

• Regarding inaccurate measurements of U, I, P, etc

  Answer: Firstly, it is necessary to ensure that the correct voltage and current signals have been connected to the instrument. A multimeter can be used to measure the voltage signal, and if necessary, a clamp meter can be used to measure the current signal. Secondly, it is necessary to ensure that the connection of the signal line is correct, such as the incoming end of the current signal and whether the phase sequence of each phase is incorrect. The multifunctional power meter can observe the power interface display. Only in the case of reverse power transmission, the active power is negative. In general, the active power sign is positive. If the active power sign is negative, it is possible that the current input line is connected incorrectly. Of course, incorrect phase sequence connection can also cause abnormal power display. Additionally, it should be noted that the electricity displayed on the instrument is the value of the primary power grid. If the multiplication ratio of the voltage and current transformers set in the instrument does not match the actual multiplication ratio of the transformers used, it can also result in inaccurate display of the instrument's electricity.

  
  

• Inaccurate spelling of electric energy and failure to save electric energy data

  Answer: The accumulation of electrical energy in instruments is based on the measurement of power. First, observe whether the power value of the instrument matches the actual load. Multi functional power meters support bidirectional energy metering. In the event of wiring errors or negative total active power, the energy will accumulate to the reverse active energy, while the forward active energy will not accumulate. The most common problem encountered on site is the reverse connection of the incoming and outgoing lines of current transformers.

  When the electrical energy data is not saved, please check if the instrument is under load. After adding the load, the instrument will continue to accumulate.

  
  

• The instrument does not light up

  Answer: Ensure that a suitable auxiliary power supply (AC/DC 85-265V) has been added to the auxiliary power terminal of the instrument. Auxiliary power supply voltage exceeding the specified range can damage the instrument and cannot be restored. A multimeter can be used to measure the voltage value of the auxiliary power supply. If the power supply voltage is normal and the instrument does not display anything, you can consider cutting off the power and powering it back on. If the instrument still cannot display normally, please contact our technical department.

  
  

• Regarding RS485 communication, the instrument did not send back data

  Answer: Firstly, ensure that the communication settings of the instrument, such as slave address, baud rate, verification method, etc., are consistent with the requirements of the upper computer. If there is no data feedback from multiple instruments on site, check whether the connection of the on-site communication bus is accurate and reliable, and whether the RS485 converter is normal. If only a single or a few instruments have communication abnormalities, the corresponding communication lines should also be checked. The address of the abnormal and normal instrument slave can be modified to test, eliminate or confirm software problems on the upper computer, or to test, eliminate or confirm instrument faults by changing the installation position of the abnormal and normal instruments.