PD668E-AS4 Short term three-phase digital 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

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

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.

3. Display mode description: By programming the "diSP" parameter in the menu, you can choose the default display interface for power on, or manually switch the display interface by pressing the left or right arrow keys

Note:

• 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.

LED digital display interface

display mode DiSP parameter values	display interface	Instructions
diSP=1		Fixed display of three-phase voltage UA, UB, UC (three-phase four wire) UAB, UAC, UAC (three-phase three wire) The left image represents: The UA phase voltage is 220.1V UB phase voltage is 220.0V The UC phase voltage is 220.3V 如果是三相四线接线方式， You can press the confirm button to check the voltage value of the three-phase line
diSP=2		Fixed display of three-phase current The left image represents: The IA phase current is 5.200A The IB phase current is 5.197A The IB phase current is 5.198A
diSP=3		Fixed display active power (P) Reactive power (Q) Power factor (PF) The left image represents: P active power 2.951KW Q reactive power 1.418Kvar PF power factor 0.893
diSP=4		Fixed display frequency (Hz) The left image represents: Switch input (1234) Switching output (1234) Frequency value 50.00Hz
diSP=5		Display active energy value, second row The digital tube is 4 digits high, and the third row is The lower 4 bits form an 8-bit value. The left image represents: Active energy value 1120.30KWh Press the confirm button to view the reverse active energy value
diSP=6		Display reactive power value, second row The digital tube is 4 digits high, and the third row is The lower 4 bits form an 8-bit value. The left image represents: Reactive power value 1120.30Kvarh Press the confirm button to view the reverse reactive power value

LCD display interface

display mode DiSP parameter values	display interface	Instructions
diSP=1		Fixed display of three-phase phase voltage (This interface is only available when selecting the three-phase four wire wiring method) The left image represents: The UA phase voltage is 220.0V UB phase voltage is 220.0V The UC phase voltage is 220.0V Positive active energy 10.00KWh
diSP=2		Fixed display of three-phase line voltage The left image represents: The voltage of UAB line is 380.0V The UBC line voltage is 380.0V The UCA line voltage is 380.0V Positive active energy 10.00KWh
diSP=3		Fixed display of three-phase current The left image represents: 1A current is 5.000A 1B current is 5.000A 1C current is 5.000A Positive reactive power 10.00Kvarh
diSP=4		Fixed display of total active power, total reactive power, and total power factor The left image represents: The total active power of ∑ P is 2.970KW The total reactive power of ∑ Q is 0.330Kvar The total apparent power of ∑ S is 3.300KVA Negative reactive power 10.00Kvarh
diSP=5		Fixed display of total power factor, frequency, and total current The left image represents: The total power factor of ∑ PF is 0.900L The frequency is 50.00Hz The total current of ∑ I is 15.00A Positive active energy 10.00KWh
diSP=6		Fixed display of three-phase power factor The left image represents: The pFA power factor is 0.900L The power factor of pfB is 0.900L The power factor of pfCJ is 0.900L Positive active energy 10.00KWh
diSP=7		Fixed display of three-phase active power The left image represents: PA active power is 0.990KW PB active power is 0.990KW The active power of PC is 0.990KW Positive active energy 10.00KWh
diSP=8		Fixed display of three-phase reactive power The left image represents: QA reactive power is 0.990Kvar QB reactive power is 0.990Kvar The reactive power of QC is 0.990Kvar Positive active energy 10.00KWh
diSP=9		Fixed display of three-phase apparent power The left image represents: SA apparent power is 0.990KVA SB apparent power is 0.990KVA SC apparent power is 0.990KVA Positive reactive power 10.00Kvarh

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.

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)
		0~9	Select the current page for displaying measurements "diSP" (LED digital display range 0~6)
		0~9999	Backlight display time: unit minute, 0 is always on (LED digital display does not have this menu)
		YES NO	After selecting YES, press the confirm button to reset all energy values to zero
		n.3.4 n.3.3	Select 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	Select communication baud rate "bAud": 1200240048009600
		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 examples

When using all instruments for the first time, please check whether the parameters of the instruments are consistent with the parameters in the distribution coefficient where they are located. The labels behind the instruments indicate the factory set parameters of the instruments; 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 opening size (unit: mm)

2. Installation method

According to the appearance of the instrument, select the corresponding installation hole size in the table above, open a hole on the installation plane, insert the instrument into the installation hole, place the two accessories into the installation slot of the housing, push them tightly by hand, and then fix them with installation screws

(Note: If there is any inconsistency with the wiring diagram on the instrument housing, please refer to the wiring diagram on the instrument housing.)

• Power supply: The working voltage range of the instrument is AC/DC 85-264V. 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.

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)

Attribute: R/W represents readable and writable, R represents read-only.

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: 80 00 00H

• Result: 235 × 80 000H/100 000H=17179869184Wh=17179869KWh

5. Examples of Communication Messages

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

Query data frame (host)

Response data frame (host)

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

Switching module section

Comparison Table of Switching Output and Transmission Output Power Parameters

Alarm parameter calculation method:

Calculation of the alarm limit value for power parameters: Take the highest 4 significant digits of the range value to obtain a 4-digit integer parameter ratio. 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

Calculation method for transmission parameters

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, 800/5A