Wireless temperature measurement device for switchgear - Wireless temperature measurement device for switchgear - Switch status indicator

Integrated intelligent control device for switchgear switch status indicator

1、 Reference standards

DL/T538-2006 Technical Conditions for High Voltage Live Display Devices

2、 Product Overview

The AKX200 series switch state intelligent control device is a new type of multifunctional, intelligent dynamic simulation display and control device developed and designed based on the current development of medium and high voltage switchgear technology. It is suitable for various complete sets of equipment such as central cabinets, handcart cabinets, fixed cabinets, and ring main units. It integrates the simulation diagram of the primary circuit of the switchgear, the position of the handcart (isolation knife), the position of the circuit breaker (opening and closing status, spring energy storage status), the position of the grounding switch, high-voltage live display (with self check), live locking, phase loss alarm, control and fault display of the environmental temperature and humidity inside the switchgear, opening/closing, remote/local, hand/self storage control, cabinet lighting, RS485 communication and other functions. This device not only has a beautiful and elegant appearance, but also optimizes the overall layout of the switchgear, making it an ideal replacement product for use in the new generation of switchgear.

III Technical Parameter

3.1 Basic Parameters

3.2 Default Temperature and Humidity Values

4 Front panel schematic diagram and explanation

5. Schematic diagram and explanation of back terminals

6、 Main functions

6.1 Status indication function (see the front panel diagram for specific indication numbers)

● Handcart position indication

1) When the handcart is in the working position (with the working position contacts closed), the red (1A, 4A) indicator light of the handcart is on;

2) When the handcart is in the test position (with the test position contacts closed), the driving indicator lights (1B, 4B) are on;

3) When the handcart is between the test position and the test position (with both the working and test position contacts not closed and all circuit breaker contacts not closed), the red and green (1A, 4A, 1B, 4B) indicator lights of the handcart do not light up;

● Circuit breaker status indication

1) When the circuit breaker is closed (the circuit breaker contact is closed), the circuit breaker indicator light (2A) lights up;

2) When the circuit breaker is opened (the circuit breaker contact is closed), the circuit breaker indicator green (2B) light is on;

3) When the circuit breaker is not inside the cabinet (both the circuit breaker closing and tapping points are not closed), the red and green (2A, 2B) lights of the circuit breaker indicator do not light up;

● Grounding switch position indication

1) When the grounding switch is closed (the opening/closing contact of the grounding switch is closed), the grounding switch indicator red (3A) light is on;

2) When the grounding switch is not closed (the opening/closing contact of the grounding switch is not closed), the green (3B) indicator light of the grounding switch is on

When the spring energy storage (not stored/stored) contact is closed, the energy storage indicator red light (6) lights up;

Attention: The above access quantities must be passive contacts.

6.2 Intelligent voice anti error prompt function

1) When the circuit breaker is closed and the handcart is between the test position and the working position (the test position and the working position are mostly closed), the 1A, 4A, 1B, 4B, and 2B indicator lights flash, and the 2A indicator light stays on with a voice prompt "Please disconnect the circuit breaker";

2) When the grounding switch is closed and the handcart is between the test position and the working position (the test position and the working position are often closed), the 1A, 4A, 1B, 4B, and 3B indicator lights flash, and the 3A indicator light stays on with a voice prompt "Please disconnect the grounding switch";

3) When both the grounding switch and the circuit breaker are closed, the 2B and 3B indicator lights flash simultaneously and accompanied by language prompts "Please disconnect the circuit breaker" and "Please disconnect the grounding switch" when the misoperated handcart switches from the test position to the working position.

6.3 High voltage live locking function

1) High voltage live display: When the A, B, and C phases are live (voltage ≥ 15% of rated voltage), the corresponding A, B, and C three-phase indicator lights (7) will turn on and emit light;

2) High voltage live locking: When any one of the three phases A, B, and C is live (voltage ≥ 65% of rated voltage), the high voltage locking indicator red light (9) lights up, the high voltage unlocking indicator green light (10) goes out, and the corresponding high voltage locking contact output pops open; When all three phases are not charged, the green light (10) for high-voltage unlocking indicator lights up, the red light (9) for high-voltage locking indicator goes out, and the corresponding high-voltage locking contact output closes;

3) High voltage live display circuit self-test: After connecting the auxiliary power supply to the device, the self-test button can be used to test the integrity of the A, B, and C three-phase live displays (the high-voltage live button is invalid);

4) High voltage phase loss alarm: When any one or two phases of A, B, and C are charged (voltage ≥ 65% of rated voltage), the phase loss alarm contact output is closed; When all three phases are not charged or when all three phases are charged, the output of the phase loss alarm contact opens.

Attention: The sensors used for A, B, and C phases must have an output short-circuit current of 220uA ± 10%.

The above is a fully functional wiring diagram. Please refer to the wiring label on the back for specific model wiring, which will not be notified separately.

6.4 Temperature and humidity control function

1) Start heating: When the ambient temperature is ≤ the corresponding set value, or when the ambient humidity is ≥ the corresponding set value, or when the "down arrow" control button is pressed, start heating and the "heating" (12) indicator light will turn on;

2) Exit heating: In automatic mode, if the temperature starts heating, the ambient temperature will rise to ≥ the corresponding set value, and if the humidity starts heating, the ambient humidity will drop to ≤ the corresponding set value. In automatic mode, if the temperature and humidity start heating simultaneously, the ambient temperature will rise to ≥ the corresponding set value, and the ambient humidity will drop to ≤ the corresponding set value. In manual mode, when the "down arrow" control button is pressed again, the heating will exit and the "heating" (12) indicator light will turn off;

3) Start exhaust: When the ambient temperature is ≥ the corresponding set value, start the fan and the "exhaust" (13) indicator light will turn on;

4) Stop exhaust: When the ambient temperature drops to ≤ the corresponding set value, stop exhaust and the "exhaust" (13) indicator light will turn off;

5) Manual/Automatic: When manual heating or exhaust is required, press the "down" or "up" button, the heater will start heating, the fan will start exhaust, and the "manual" light will turn on; Press the 'down' or 'up' button again to exit manual heating or exhaust, and switch to automatic control mode. The 'manual' light will turn off;

6) Load disconnection alarm: When there is no current flowing through the corresponding heating or fan circuit, the load disconnection contact closes and the "disconnection" (14) indicator red light flashes;

6.5 Operational Functions

1) Self storage/Hand storage conversion

2) Opening/closing operation

3) Remote/Local Conversion

4) When the cabinet lighting is in the measurement and control state of the device, long press the enter key for ≥ 3S to start the cabinet lighting and display corresponding indicators: the digital type will have a green indicator light (15) on, the LCD type will have a "·" on, and the LCD display will be in a constant on state. Touch the enter key again to turn off the cabinet lighting, and the corresponding indicator will turn off. The LCD display will be in a timed automatic off state.

6.6 Working mode

6.6.1 Measurement

In the measurement state, area 20 displays the current measurement mode channel and temperature and humidity values, and the temperature and humidity values of the corresponding sensor channels can be cyclically measured and displayed during multi-channel measurement and control.

6.6.2 Control

When the temperature or humidity value of the environment meets the pre-set working conditions, the heater or fan is started, and the corresponding indicator light is lit. When the load fails and does not work according to the conditions, the corresponding load fault indicator light flashes to indicate an alarm.

6.6.3 Control Testing

In normal working condition, press and hold the down arrow key for more than 5 seconds, and all channels that are working normally will be heated unconditionally; Press and hold the up arrow key for more than 5 seconds, and all channels that are working properly will blow air unconditionally.

6.7 Setting Mode

6.7.1 Enter/Exit System Settings Mode

Entering the system: Under normal circumstances, the instrument panel is in normal working condition. Press the main menu button for 3 seconds to enter the system settings mode. Press the up and down keys to enter the password, which defaults to 0000 at the factory. Press the enter key, and if the password is correct (displaying YES), the system will automatically enter the main menu. After entering the main menu, Area 1 displays "CH1". Press the enter key to enter Channel 1's working parameter settings. Press the up and down keys to switch to other menus at the same level, including "CH2", "COMM", "DISP", and "REST", which are respectively used for setting channels, communication, display mode, and factory settings (see user programming flowchart).

Click the enter key to enter the main menu, where you can use the up and down keys to select corresponding options from other main menus for settings. The communication "COMM" can set the local address (1-247) and communication baud rate (1200, 2400, 4800, 9600, 19200). Display mode "DISP" sets the interval time for two channel cyclic displays, which is related to closed loop OFF or intervals of 2S, 4S, 6S, 8S.

Exit the system: Click on the main menu at any position and select whether to save and exit the system settings to return to normal working mode. Pressing the 'Main Menu' button in the main menu setting mode will take you back to the previous menu directory until the system setting mode returns to normal operation. In the menu setting mode, do not operate the button and it will automatically return to normal working mode after about 3 minutes.

6.7.2 Setting of Channel Parameters (Taking LD8200 as an Example)

The parameter setting process for CH1 and CH2 is safe and the same. The following provides a detailed explanation using CH2 as an example.

Display before entering CH2:

Click enter to display as follows

Select 'ON', click enter to display the following

Click enter to display as follows

Click enter to display as follows

Click enter to display as follows

Click enter to display as follows

Click enter to display as follows

Click enter to display as follows

Click enter to display as follows

Click enter to display as follows

Click enter to display as follows

6.7.3 Setting System Passwords

Press and hold the main menu key and enter key simultaneously for more than 3 seconds to display "C.cHg". Click the enter key to enter and enter the current system password. Click the enter key to confirm the entered password. If it is correct, it will display "yES" and automatically switch to "n.Cod". Click to enter and enter the new password. Use the enter key to select whether to save and exit.

If no valid button is pressed within two minutes at any set position, the system will automatically return to the measurement state and the settings will not be saved.

6.7.4 User Programming Flowchart

AKX200 User Programming Flowchart

Password modification

Factory reset parameters for the device:

a） 1、 2-channel temperature: (heating temperature) 5 ℃, cooling temperature 40 ℃, hysteresis: 10 ℃

b） 1、 2-channel humidity: 85% RH hysteresis: 10% RH

c) Communication parameter settings:

Address: 1

Baud rate: 4800

d) Loop display: OFF (fixed display)

e) Channel 1 is open, channel 2 is open; Load disconnection alarm turned off

f) Voice alarm function turned off

g) Initial password: 0001

6.8 Communication Function

Support remote query of switch status

1) Communication method: RS-485;

2) Communication protocol: ModBus RTU;

3) Communication format: Asynchronous 1200/2400/4800/9600/19200 bps User programmable

7、 Installation screen opening (mm)

8Outline dimension drawing (mm)

9、 Communication Guide

9.1 communication

This chapter mainly discusses how to use software to control this series of instruments through communication ports. To master this chapter, you need to have a knowledge reserve of MODBUS protocol and have read all the contents of other chapters in this book, so as to have a comprehensive understanding of the functions and application concepts of this product.

9.1.1 Overview of MODBUS Protocol

This series of intelligent switch status comprehensive operation display devices uses the MODBUS communication protocol, which defines in detail the verification code, numerical sequence, etc., which are necessary contents for specific data exchange. The MODBUS protocol uses a master-slave responsive connection (half duplex) on a single communication line, which means that signals are transmitted to the host in opposite directions on a separate communication line.

The MODBUS protocol only allows communication between hosts (PCs, PLCs, 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 that arrive locally.

9.1.2 Query Response Cycle

query

The function code in the query message informs the selected slave device of what function to perform. The data segment contains any additional information about the functions to be performed by the device. For example, function code 03 requires reading and holding registers from the device and returning their contents. The data segment must contain information to be communicated to the slave device: where to start reading from and the number of registers to be read. The error detection domain provides a method for verifying the correctness of message content for slave devices.

respond

If a normal response is generated from the device, the function code in the response message is a response to the function code in the query message. The data segment includes data collected from the device, such as register values or states. If an error occurs, the functional code will be modified to indicate that the response message is incorrect, and the data segment contains code describing this error message. The error detection domain allows the master device to confirm whether the message content is available.

9.1.3 Transmission Method

The transmission method refers to a series of independent data structures within a data frame that are input into a finite set of rules for transmitting data. The following defines a transmission method compatible with the MODBUS protocol RTU method.

Bit per byte:

1 starting position

8 data bits, the smallest significant bit is sent first

No parity check bit

1 stop position

Error Cheeking

CRC (Cyclic Redundancy Check)

9.1.4 Protocol

When a data frame arrives at a terminal device, it is addressed to the device through a simple "port" entry. This algorithm removes the "envelope" (header) of the data frame, reads the data, and if there are no errors, executes the task requested by the data. Then, it adds the data it generates to the obtained "envelope" and returns the data frame to the sender. The returned response data contains the following information: the terminal slave address (Address), the executed command (Function), the requested data generated by executing the command (Data), and a check code (Check). Any error that occurs will not result in a successful response or return an error indication frame.

Data Frame

address field

The address field is located at the beginning of the frame and consists of one byte (8-bit binary code) with decimal values ranging from 0 to 255. In our system, only 1 to 247 are used, while other addresses are reserved. These bits indicate the address of the user specified terminal device, which will receive data from the host connected to it. The address of each terminal device must be *, and only the addressed terminal device will respond to queries containing that address. When a terminal sends back a response, the slave address data in the response tells the host which terminal is communicating with it.

Functional domain

The functional domain code tells the addressed terminal what function to perform. The following table lists the function codes used in this series of instruments, as well as their meanings and functions.

Data domain

The data domain 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 these data may be numerical values, reference addresses, or set values. For example, the function field code tells the terminal to read a register, while the data field needs to indicate which register to start from and how many data to read. The embedded address and data vary depending on the type and content between the slaves.

Error verification field

This domain allows hosts and terminals to check for errors during transmission. Sometimes, due to electrical noise and other interference, a set of data may undergo some changes on the line when transmitted from one device to another. Error checking can ensure that the host or terminal does not respond to the data that has changed during the transmission process, which improves the integrity or efficiency of the system. Error checking uses a 16 bit cyclic redundancy method (CRC16). The Error Check (CRC) field occupies two bytes and contains a 16 bit binary value. The CRC value is calculated by the transmitting 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 do not match, an error occurs. CRC operation is to first preset a 16 bit register to all 1s, and then continuously calculate the current value of each byte in the data frame with the current value of the register. Only the 8 data bits of each byte participate in generating CRC, and the start and end bits, as well as the parity bits that may be used, do not affect CRC. When generating CRC, each byte's 8 bits are XORed with the contents of the register, and the result is then transferred to the lower bits. The higher bits are supplemented with "0", and the least significant bit (LSB) is removed and detected. If it is 1, the register performs an XOR operation with a preset fixed value (0A001H). If the least significant bit is 0, no processing is performed. The above process is repeated until 8 shift operations are performed. After the last bit (8th bit) is shifted, the next 8-bit byte is XORed with the current value of the register, and another 8 shift XOR operations are performed. When all the bits in the data frame are processed, the final value generated is the CRC value.

The process of generating a CRC is as follows:

Pre set a 16 bit register as 0FFFFH (all 1s), called the CRC register; XOR the 8 bits of the * bytes in 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, and move the lowest bit out and check; If the least significant bit is 0: repeat step three (next shift); If the least significant bit is 1, perform an XOR operation between the CRC register and a preset fixed value (0A001H); Repeat steps three and four until there are 8 displacements, thus completing a complete eight bit process. Repeat steps two to five to process the next eight bits until all byte processing is completed; The value of the final CRC register is the value of the CRC.

9.2 Detailed explanation of communication application formats

The examples given in this section will use the format shown in the figure as much as possible, with numbers in hexadecimal

Read data (function code 03 or 04)

Query data frame

This feature allows users to obtain data and system parameters collected and recorded by the device. There is no limit to the number of data requests a host can make at once, but it cannot exceed the defined address range.

The following example shows the basic data collected from two readings on machine 01: the temperature and humidity values of CH1, where the address of the temperature value is 0003H and the address of the temperature value is 0004H, both of which are 2 bytes in length.

Response data frame

The response includes slave address, function code, byte length of data, data and CRC error checking.

The following is the response for reading the temperature and humidity values of CH1.

Temperature=(010CH)/0AH=268/10=26.8 ℃

Humidity=002DH=45%.

The following is the address table (WORD) for parameter reading:

Note 1: The last two bits of the two byte 'zui' are used to express the working status of the load

The load working status indicates that the 0000 00X0 heater is working normally;

0000 00X1 heater malfunction;

The 0000 000X fan is working properly;

0000 001X fan malfunction

10 Precautions for use

10.1 The power supply must be connected strictly according to the indicated voltage level, and the wiring must be strictly in accordance with the terminal markings on the back.

10.2 During installation, the wiring terminals should be tightened and the equipment should be firmly placed in a sturdy, fire-resistant, and vibration resistant position. The best effect is when the equipment is viewed from above, so it should be installed vertically with a height of 1.8m.

During the voltage withstand test, the terminals (20, 21, 22, 23) of the live display part must be disconnected or short circuited.

10.4 All switch contacts must be passive connections.

10.5 Connect the wires according to the physical wiring label. Any changes will not be notified separately.

10.6 The company shall not be held responsible for any malfunction caused by improper use or non product related issues.

11 Transportation and storage

11.1 The equipment should be stored in an environment with a temperature of -25 ℃~70 ℃ and humidity<85%, and should be placed in its original packaging with a stacking height of no more than 5 layers.

11.2 The equipment should not be stored after unpacking.

11.3 Equipment transportation and unpacking should not be subjected to severe impact, and should be transported and stored in accordance with the provisions of GB/T15464-1995 "General Technical Conditions for Packaging of Instruments and Meters".

Integrated intelligent control device for switch status indicator switch cabinet