PD668E-3S4 Long term three-phase digital multifunctional instrument (Black/White)

Product Introduction

This series of products is a multifunctional intelligent instrument with programmable measurement, display, digital communication, and power pulse output. It can complete power measurement, power metering, data display, acquisition, and transmission, and can be widely used in substation automation, distribution automation, intelligent construction, internal power measurement, management, and assessment of enterprises. The measurement accuracy is 0.5 level, realizing LED on-site display and remote RS-485 digital interface communication, using MODBUS-RTU communication protocol.

Technical Specifications

Installation and Wiring

1. Instrument size

2. Installation size

• Open holes of varying sizes in the fixed distribution cabinet;

• Remove the instrument panel, loosen the screws, and remove the fixed bracket;

• The instrument is inserted into the installation hole from the front;

• Insert the instrument mounting bracket and tighten the screws to secure the instrument.

3. Terminal wiring diagram

(Note 1: The wiring method is the same for different sizes.)

(Note 2. The asterisk on the current line indicates the incoming line, and the incoming and outgoing lines are connected in reverse. The energy measurement is in reverse phase.)

Programming operation

1. Entering and exiting programming state

• Enter programming mode:

  Press when measuring the display status“”Key, enter password input mode, use“”The key“”Enter the password (default user password is 9999), and then press“”Press the key to enter the programming status page. Attention: If you enter the password, press“”After pressing the key, exit to the measurement display state,

  It means that the input password is incorrect.

  
  

• Exit programming state:

  In the programming state,Press the button to exit the programming mode, and the user will be prompted to choose whether to save the settings. "Yes" will save the settings, and "No" will not save them. Press“”Press the key to exit the programming state.

2. The use of buttons in programming operations

• function key: Enter menu settings or return to the previous menu

• keyLoop query displays the numerical value, which is the plus key (0-9999) when programming the menu.

• keyLoop query displays the numerical value, which is the minus key (9999-0) loop when programming the menu.

• Confirm keyEnter the sub menu key and exit the menu with the OK key.

3. Parameter setting instructions

Panel description and measurement information display

page	content	Instructions
one three-phase voltage		Display the voltage Ua, Ub, Uc (3-phase 4-wire) or Uab, Ubc, Uca (3-phase 3-wire) separately, in V, and in kV when the k indicator light is on. In the left figure, Ua=220.0 V, Ub=220.3V, Uc=220.1V. When using 3 phases and 4 lines, press“”The key can switch between displaying phase voltage and line voltage.
two three-phase current		Display 3-phase currents Ia, Ib, and Ic in units of A. In the left figure, Ia=5.000A, Ib=4.998A, and Ic=5.00lA.
three Active power, reactive power, power factor		Display active power W, reactive power Var, and power factor PF. In the left figure, W=3.142kW, Var=1.009kVar, PF=0.952.
four The first row contains 4-channel input information, the second row contains 4-channel output information, and the third row contains grid frequency		Display frequency. Frequency Hz=50.00Hz.

page	content	Instructions
five Positive active energy		Display the positive active energy value, with the second row of digital tubes showing the high 4 bits and the third row showing the low 4 bits, forming an 8-bit value. The left figure shows that the active energy value is 1234.56kWh.
six Positive reactive power		Display the positive reactive power value, with the second row of digital tubes showing the high 4 digits and the third row showing the low 4 digits, forming an 8-bit value. The left figure shows that the inductive reactive power value is 23.45 kVarh.
seven Reverse active energy		Display the reverse active energy value, with the second row of digital tubes showing the high 4 bits and the third row showing the low 4 bits, forming an 8-bit value. The left figure shows that the active energy value is 1.23kWh.
eight Reverse reactive power		Display the reverse reactive power value, with the second row of digital tubes showing the high 4 digits and the third row showing the low 4 digits, forming an 8-bit value. The left figure shows that the active energy value is 12.34kWh.

functional module

1. RS485 communication

• physical layer

  (1) Rs485 communication interface, asynchronous semi dual II mode.

  (2) The communication baud rate can be set to 4800 and 9600bps, with a factory default value of 9600bps.

  (3) Byte transfer format: N81 with no checksum, 8 data bits, and 1 stop bit.

  
  

• Communication protocol M0bus RTU

  This instrument provides a serial asynchronous half duplex RS485 communication interface, using the standard MODBUS-RTU protocol, and various data information can be transmitted on the communication line. Up to 64 network instruments can be connected simultaneously on a single line, and each network instrument can set its communication address. The communication connection should use shielded twisted pair cables with copper mesh, and the wire diameter should not be less than 0.5mm ². When wiring, communication lines should be kept away from strong electrical cables or other strong electric field environments. It is recommended to use a T-shaped network connection method, and star or other connection methods are not recommended.

  
  

  The MODBUS protocol adopts a master-slave response communication connection method on a communication line. Firstly, the signal from the host computer is addressed to a terminal device (slave) with a unique address. Then, the response signal sent by the terminal device is transmitted to the host in the opposite direction, that is, all communication data streams are transmitted in opposite directions along a separate communication line (half duplex working mode). The MODBUS protocol only allows communication between the host (PC, PLC, etc.) and terminal devices, and does not allow data exchange between independent terminal devices. This way, each terminal device will not occupy the communication line during their initialization, but only respond to query signals arriving locally.

  

  
  

  Host query: The query message frame includes device address, function code, data information code, and verification code. The address code indicates the slave device to be selected; The function code informs the selected slave device of what function to perform, for example, function code 03 requires the slave device to read registers and return their contents; The data segment contains any additional information required for each function to be executed, and the checksum is used to verify the correctness of a frame of information. The slave device provides a method for verifying whether the message content is correct, which adopts the calibration rule of CRC16.

  
  

  
  

  Slave response: If the slave device generates a normal response, the response message contains the slave address code, function code, data information code, and CRC16 checksum. The data information code includes data collected from the device, such as register values or status. If an error occurs, we agree that the slave will not respond.

  
  

  
  

  We specify the communication data format to be used in this instrument: 1 start bit per byte, 8 data bits, no checksum, and 1 stop bit.

  
  

  
  

  The structure of data frames, i.e. message format:

  Device address	Function code	data segment	CRC, 16 verification code
  1 byte	L bytes	N bytes	2 bytes

  
  

  Device address: Composed of one byte, only 1-247 are used in our system, while other addresses are reserved. The address of each terminal device must be unique, and only the addressed terminal will respond to the corresponding query.

  
  

  Function code: tells the addressed terminal what function to perform. The following table lists the functional codes supported by this series of instruments, as well as their functions.

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

  
  

  Data segment: It contains the data required by the terminal to perform specific functions or the data collected by the terminal in response to queries. The content of this data may be numerical values, reference addresses, or set values.

  
  

  Verification code: CRC16 occupies two bytes and contains a 16 bit binary value. The CRC value is calculated by the transmission device and then attached to the data frame. The receiving device recalculates the CRC value when receiving the data and compares it with the value in the received CRC field. If these two values are not equal, an error occurs.

  
  

  The process for generating a CRC16 is as follows:

  (1) Pre set a 16 bit register as OFFFFH (all 1s), called the CRC register.

  (2) XOR the 8-bit of the first byte in the data frame with the low byte in the CRC register, and store the result back in the CRC register.

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

  (4) If the lowest bit is 0: repeat the third step (next shift); If the lowest bit is 1: XOR the CRC register with a preset fixed value (0A001H).

  (5) Repeat steps three and four until 8 shifts are made. This completes a complete eight digit process.

  (6) Repeat steps 2 to 5 to process the next eight bits until all byte processing is complete.

  (7) The final value of the CRC register is the value of CRC16.

  
  

  
  

• Example of Communication Message

  (1) Read data register (function code 03H): Read three-phase current values, A-phase voltage 218.79V, B-phase voltage 219.79V, C-phase voltage 220.79V, instrument address 1.

  Host reads data frames:

  address	command	Starting address (high-order)	Number of registers (high-order)	Verification code (low order first)
  01H	03H	00H,17H	00H,06H	75H,CCH

  
  

  Instrument response data frame:

  address	command	data length	Data segment (12 bytes)	verification code
  01H	03H	0CH	435ACC9DH,435BCC9DH, 435CCC9DH	94H,C8H

  
  

  (2) Write data register (function code 10H): Set current ratio CT=300, voltage ratio PT=100, and instrument address 1.

  Host writes data frames:

  address	command	starting address	Number of registers	byte count	data segment	verification code
  01H	10H	00H,02H	00H,02H	04H	00H,64H,01H,2CH	33H,E4H

  
  

  Instrument response data frame:

  address	command	starting address	Number of registers	verification code
  01H	10H	00H,02H	00H,02H	E0H,08H

  
  

• Modbus Communication Register Address Table

  address	Project Description	data type	attribute	Instructions
  0	Enter menu password	Int	R/W	Range: 0~9999
  one	Communication baud rate	Int	R/W	2:9600bps 0:4800bps Range: 1-247
  	Mailing Address
  two	Voltage conversion ratio PT	Int	R/W	Range: 1~9999
  three	Current ratio CT	Int	R/W	Range: 1~9999
  four	电参数显视方式	Int	R/W	Refer to the menu settings for instructions on this item 80: Three phase three wire, 0: Three phase four wire
  	Input signal wiring method
  5~21	retain	Int	R/W
  twenty-two	teleindication	Int	R/W
  23, 24	Phase A voltage	float	R	Float is a floating-point format, All data that complies with the IEEE754 standard is primary data, and the floating-point format is detailed in the additional instructions.
  25, 26	Phase B voltage	float	R
  27, 28	Phase C voltage	float	R
  29, 30	AB phase voltage	float	R
  31, 32	BC phase voltage	float	R
  33, 34	CA phase voltage	float	R
  35, 36	Phase A current	float	R
  37, 38	Phase B current	float	R
  39, 40	Phase C current	float	R
  41, 42	A-phase active power	float	R
  43, 44	B-phase active power	float	R
  45, 46	C-phase active power	float	R
  47, 48	Total Active Power	float	R
  49, 50	A-phase reactive power	float	R
  51, 52	B-phase reactive power	float	R
  53, 54	C-phase reactive power	float	R
  55, 56	Total reactive power	float	R
  57, 58	A-phase apparent power	float	R
  59, 60	B-phase apparent power	float	R
  61, 62	C-phase apparent power	float	R
  63, 64	Total apparent power	float	R
  65, 66	A-phase power factor	float	R
  67, 68	B-phase power factor	float	R
  69, 70	C-phase power factor	float	R
  71, 72	Total Power Factor	float	R
  73, 74	frequency	float	R
  75, 76	Positive active energy	float	R
  77, 78	Reverse active energy	float	R
  79, 80	Positive reactive power	float	R
  81, 82	Reverse reactive power	float	R

  
  

2. Electricity metering and energy pulse output

The digital multifunctional power meter can provide bidirectional active and reactive energy measurement, with 2-channel power pulse output function and RS485 digital interface to complete the display and remote transmission of power data. The power pulse of the collector level up circuit optocoupler relay enables remote transmission of active and reactive power, and can be measured by collecting the total number of pulses from the instrument through remote computer terminals, PLCs, and DI switch acquisition modules to achieve cumulative energy measurement. The output method used is the precision testing of electrical energy (National Metrology Regulations: Pulse Error Comparison Method for Standard Meters).

• (1) Electrical characteristics: In the circuit diagram of the pulse acquisition interface, VCC<48V and Iz<50mA are shown.

• (2) Pulse constant: 3200 imp/kWh; When the instrument accumulates lkWh, the number of pulse outputs is N=3200. It should be emphasized that 1kWh is the secondary measured energy data of electrical energy. In the case of PT and CT, the relative N pulse data corresponds to one measured energy of IkWhX voltage ratio PTX current ratio CT.

• (3) Application example: The PLC terminal uses a pulse counting device. Assuming that N pulses are collected during a period of time t, and the instrument input is 10kV/100V, 400A/5A, the accumulated electrical energy of the instrument during this period is N/3200X100X80 kWh.

3. Switch input section

• Switch input part: It should provide 4-channel one switch input function. The 4-channel switch input is used for node resistance switch signal input, and the instrument is equipped with a+5V working power supply inside, without the need for external power supply. When the external is connected, it is collected by the instrument switch input module DI as the connection information and displayed as 1; When the external is disconnected, the instrument switch input module DI collects the disconnection information and displays it as 0.

  

  Input DI: Connect resistor R<500Q; Turn off resistor R>100KQ

  
  

• Register:

  DI information register: This register represents the status information of 4 switch inputs

  DI register	BIT15～BIT4	BIT3	BIT2	BIT1	BIT0
  Corresponding switch port		Di4	Di3	Di2	Di1
  reset	Unrelated position	0	0	0	0

  The lower 4 bits (BIT3, BIT2, BITI, BITO) of the DI information register are switch input status information. If the register content is 00000 101, it indicates that the switch input ports 3 and 1 are conductive, and 4 and 2 are off.

3. Application examples:

• Switch input function:

  The switch module has a 4-channel switch input acquisition function. After collecting the input signal, the LED on the instrument panel displays its "conduction -1" or "shutdown -0" information, which is used for local monitoring of the Tianguan signal. Switch the instrument to the switch information display state, and the indicator light on "DI" will light up. The highest row of digital tubes on the panel displays the status information (DI) of the switch input. From left to right, they are the 4th, 3rd, 2nd, and 1st channels, respectively. The diagram on the right shows that the 4th, 3rd, and 1st channels are in a conducting state, while the 2nd channel is in an off state.

  The information from the switch information register (DI) can be transmitted to a remote computer terminal through the RS485 digital interface of the instrument.

  
  

• Switching output section

  Switching output part: The switching output function of 4-channel relays 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 conductive, and when the switch output is closed, the relay output is turned off.

  

  
  

  (1) Electrical parameters:

  Open DO: AC250V1A

  
  

  (2) Register:

  DO information register: This register represents the status information of four switch outputs.

  DO register	BIT15～BIT4	BIT3	BIT2	BIT1	BIT0
  Corresponding switch port		Di4	Di3	Di2	Di1
  reset	Unrelated position	0	0	0	0

  The lower 4 bits (BIT3, BIT2, BITI, BIT0) of the DO information register are switch output status information. If the register content is 11010000, it indicates that ports 1, 3, and 4 are conducting, 2 is off, and all DO information can be displayed on the instrument's LED.

  project	variable	Setting method
  Switch output 1	DO1	BYTE1(1～52)， The alarm items, even numbers correspond to the corresponding 26 measured high electricity alarms in the electricity address table; odd numbers correspond to the corresponding 26 measured low voltage alarms in the electricity address table; 0 indicates remote control mode. Please refer to the comparison table of switch output and transmission output power parameters. BYTE2(0～9999)， The alarm limit parameter is the secondary value of the power parameter, and the data format is shown in the appendix
  Switch output 2	DO2
  Switch output 3	DO3
  Switch output 4	DO4

  Switch output function:

  Remote control function:

  Host writes data frames:

  address	command	starting address	Number of registers	byte count	data segment	verification code
  01H	10H	00H,16H	00H,01H	02H	00H,06H	24H,A4H

  Instrument response data frame:

  address	command	starting address	Number of registers	verification code
  01H	10H	00H,16H	00H,01H	EOH,0DH

  

  
  

  By writing control information to the YCDO information register (16H) through the upper computer, the on/off of four switch output ports can be controlled. Writing to the corresponding port will turn on, and writing to 0 will turn off the corresponding port. If the binary number 00000 110 is written, it means that the output ports of the 2nd and 3rd switch values are conductive, and the 1st and 4th switch values are disconnected. This function cannot be used in conjunction with another over limit alarm output function of the switch output 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 upper right image indicates that the 4th and 1st channels are in the off state, while the 3rd and 2nd channels are in the on state when in remote control mode.

  
  

  Another function of the switch output module is to output an over limit alarm. 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. Directly set the alarm object and alarm value through the operation of the panel buttons. Comparison Table of Switching Output and Transmission Output Power Parameters

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

  
  

  Alarm parameter calculation method:

  The calculation formula for the limit parameter value of electric parameter scattering:

  

  
  

  The method for determining the value of the set value and the rated value of the secondary value is the same.

  Programming example: For the setting of three-phase wire system 10kV/100V: 400A/5A instrument,

  The set value should be written as:

  Set requirements	alarm condition	range		Programming parameter settings
  		One measurement range value	Secondary measurement range value	Corresponding parameters of electrical parameters	set value
  Voltage alarm	Ua＞100V	10kV	one hundred	one	one thousand
  	Ub＞110V			three	one thousand and one hundred
  	Uc＜80V			six	eight hundred
  Current alarm	Ia＞400V	four hundred	five	thirteen	five thousand
  	Ib＜360V			sixteen	four thousand and five hundred
  	Ic＜40V			eighteen	five hundred
  Power alarm	Ps＞12MW	12MW	one thousand and five hundred	twenty-five	one thousand and five hundred
  	Pa＞4MW	4MW	five hundred	nineteen	five hundred
  	Pb＜2MW			twenty-two	two hundred and fifty
  Power factor alarm	Pfs＞0.9	one	one	forty-nine	nine hundred
  	Pfs＞0.866			forty-three	eight hundred and sixty-six
  	Pfs＜0.5			forty-six	five hundred

  
  

• Analog quantity transmission output module

  Analog transmission output module: It provides 4-channel analog transmission output function, and each channel can select any one of the 26 electrical parameters for setting. Through the analog transmission module of the instrument itself, the analog transmission output function of electrical parameters (0~20mA/4~20mA) can be achieved, and the corresponding relationship between the quantities can be set arbitrarily.

  
  

  Electrical parameters: Output 0~20mA, 0~20mA accuracy level 0.5%

  Overload: 120% effective output, maximum current 24mA, voltage 12V

  Load: Rmax=4009

  
  

  Register:

  Instrument programming keyboard setting, realizing the setting of 4-channel analog transmission output, including selecting the desired transmission

  The power parameters corresponding to the daily and full range 20mA output of the power item.

  project	variable	Setting method
  Switch output 1	DO1	BYTE1(1～52)， The alarm items, even numbers correspond to the corresponding 26 measured high electricity alarms in the electricity address table; odd numbers correspond to the corresponding 26 measured low voltage alarms in the electricity address table; 0 indicates remote control mode. Please refer to the comparison table of switch output and transmission output power parameters. BYTE2(0～9999)， The alarm limit parameter is the secondary value of the power parameter, and the data format is shown in the appendix
  Switch output 2	DO2
  Switch output 3	DO3
  Switch output 4	DO4

  project	variable	Setting method
  Variable output 1	AO1	BYTE1(1～52)， The alarm items, even numbers correspond to the corresponding 26 measured power outputs of 4mA~20mA in the power address table, and odd numbers correspond to the corresponding 26 measured power outputs of 0mA~20mA in the power address table. Please refer to the comparison table of switch output and transmission output power parameters. BYTE2 (0-9999), 20mA output: corresponding parameter values, data format see appendix.
  Variable output 2	AO2
  Variable output 3	AO3
  Variable output 4	AO4

  Calculation of output parameter values for electrical parameter transmission: Take the secondary rated value.

  Programming example: For three-phase four wire system 10kV/100V; The setting value in the 4400A/5A instrument should be written as:

  Set requirements	alarm condition	range		Programming parameter settings
  		One measurement range value	Secondary measurement range value	Corresponding parameters of electrical parameters	set value
  Voltage transmission	Ua: 0-10kV/4-20mA	10kV	one hundred	one	one thousand
  	Ub: 0-10kV/4-20mA			three	one thousand and one hundred
  	Uc: 0-10kV/0-20mA			six	eight hundred
  Current transmission	Ia: 0-400kV/4-20mA	four hundred	five	thirteen	five thousand
  	Ib: 0-400kV/4-20mA			sixteen	four thousand and five hundred
  	Ic: 0-400kV/4-20mA			eighteen	five hundred
  Power transmission	Ps: 12MW/4-12-20mA	12MW	one thousand and five hundred	twenty-five	one thousand and five hundred
  	Pa: 4MW/4-12-20mA	4MW	five hundred	nineteen	five hundred
  	Pb: 4MW/0-10-20mA			twenty-two	two hundred and fifty
  Power factor transmission	Pfs: 0-1/0-12-20mA	one	one	forty-nine	nine hundred
  	Pfa: 0-1/4-12-20mA			forty-three	eight hundred and sixty-six
  	Pfs: 0-1/0-10-20mA			forty-six	five hundred

  Secondary rated value and secondary value appendix:

  (1) The voltage is the voltage value on the secondary side, with one decimal place.

  (2) The current is the current value on the secondary side, fixed to 3 decimal places.

  (3) The power is the power value on the secondary side, fixed to 0 decimal places.

  (4) The power factor is fixed to 3 decimal places.

  (5) The frequency is fixed to 2 decimal places.

  
  

  Floating Point Conversion Appendix:

  

  
  

  Floating point data collection requires collecting 4 bytes at a time. The collection is high in the front and low in the back. BYTEI was collected first, and BYTE4 was collected last.

  BYTE1
  S	E1	E2	E3	E4	E5	E6	E7
  BYTE2
  E8	M1	M2	M3	M4	M5	M6	M7
  BYTE3
  M8	M9	M10	M11	M12	M13	M14	M15
  BYTE4
  M16	M17	ML 8	M19	M20	M2L	M22	M23