Emergency rapid processing control device for weak current fault of air handling unit

Abstract

The utility model discloses an air handling unit weak current fault emergency rapid processing control device, which belongs to the field of automatic control, and comprises a unit controller, which is respectively connected with a power supply converter, a transmitter and a target control equipment interface module; the core of the unit controller is a field preset program unit controller; the input and output signals of the unit controller comprise digital I / O signal or analog quantity input, main signal input, auxiliary signal input, analog signal output and digital signal output; signals input to the transmitter comprise a power supply, a temperature control signal and a humidity control signal. Input and output signals of the unit controller and output signals of the transmitter are connected with external target control equipment through the target control equipment interface module. When an automatic control system of the air handling unit breaks down, the control device can replace and quickly establish local high-precision and high-stability automatic control.

Description

Technical Field

[0001] This application relates to a rapid fault handling device for automatic control systems, belonging to the field of automatic control, and particularly to an emergency rapid fault handling control device for weak current faults in air handling units. Background Technology

[0002] The controllers of automatic control systems mainly include main control systems such as PLCs, DCSs, and FCSs. In low-level applications, PLC control systems are the most common; while in large and medium-sized control systems requiring distributed control and centralized management, DCS control systems are typically used. FCS systems are mainly used in large systems and are also the most promising fieldbus control system of the 21st century, with intricate connections to PLCs and DCSs. As the core of field automation equipment, the controller is responsible for the execution and feedback of all field devices, the acquisition of all parameters, and the issuance of commands.

[0003] Air handling units typically use automatic control systems to regulate and maintain environmental parameters. When a fault occurs in the air handling unit's automatic control system, it is necessary to quickly address the fault to ensure that the working environment protected by the air handling unit is not affected.

[0004] The reasons why the automatic control system cannot be repaired in a timely manner include:

[0005] 1. The automatic control software program is missing, requiring professional technicians to reprogram and update the software;

[0006] 2. If the on-site DDC controller equipment fails, the first step is to purchase the necessary components, and then have a professional perform the data reading and writing work.

[0007] 3. Data transmission line failure, requiring comprehensive line inspection and repair;

[0008] 4. The transmitter is malfunctioning and requires the purchase of replacement parts;

[0009] 5. The centralized control center has no power supply.

[0010] 6. Certain force majeure events prevent professional technicians from arriving at the site in a timely manner to carry out fault repair work. Utility Model Content

[0011] To address the shortcomings of existing technologies in that they cannot promptly repair automatic control systems, this application proposes an emergency rapid handling control device for weak current faults in air handling units. This device serves as a backup for automatic control system failures, offering strong operability, a simple and rapid handling process, high efficiency, and economy.

[0012] The air handling unit's low-voltage fault emergency rapid handling control device includes: a unit controller, a power converter, a transmitter, and a target control device interface module; the unit controller is connected to the power converter, the transmitter, and the target control device interface module respectively; the input and output signals of the unit controller and the output signals of the transmitter are connected to external target control devices through the target control device interface module, thereby forming a universal interface for easy and quick replacement during maintenance.

[0013] Optionally, the input and output signals of the unit controller include:

[0014] At least one of the digital I / O signal or analog quantity for winter / summer mode conversion and digital I / O signal or analog quantity for day / night mode conversion is inverted into a heating / cooling output signal by the unit controller;

[0015] Main signal input, used to receive the signal input from the transmitter;

[0016] Auxiliary signal input is used to add remote indoor temperature and humidity signal transmission, which, combined with the unit controller's maximum priority control, enables precise adjustment. The maximum priority of the unit controller ensures that a specific key setting is executed first under certain conditions. In the unit controller, this function allows ensuring that a particular signal or setpoint has the highest priority when multiple control signals or setpoints exist, thereby achieving precise and efficient control of the system.

[0017] Analog signal output, used to provide DC0-10V analog signals to the output analog signal proportional actuator, including at least a set of positive proportional analog signals and a set of negative proportional analog signals;

[0018] Digital signal output, used to output digital signals to a digital actuator, including at least one set of positive digital signals and one set of negative digital signals.

[0019] Optionally, the signals input to the transmitter include at least one of the following: DC power supply, temperature control signal, humidity control signal, water valve drive signal, and air valve drive signal.

[0020] Optionally, the core of the unit controller is a field-preset program unit controller; it is pre-programmed with temperature control program and humidity control program, which are used to realize winter / summer and day / night switching according to the received digital I / O signals or analog quantities; and generate analog signal output and digital signal output according to the temperature control program and humidity control program.

[0021] Preferably, the field preset program unit controller is an RWD series unit controller manufactured by Siemens AG, Germany. Among Siemens' many products, the RWD series field preset program unit controller offers relatively high cost-effectiveness, ease of operation, comprehensive built-in programs, and a relatively high degree of development and utilization.

[0022] Optionally, the digital actuator is used to control a digital signal damper controller or a digital signal humidifier.

[0023] Preferably, the digital actuator is a Siemens 090707C model, and the temperature control program is set to a control accuracy of ±0.5℃.

[0024] Preferably, an AC24V intermediate relay is added to the Siemens 090707C digital actuator to form an electrically controlled valve with digital I / O signal input.

[0025] Preferably, the humidity control program is used to change the transmitter's measurement unit and rated measurement range.

[0026] Preferably, the power converter includes an isolation control transformer, whose primary and secondary sides are electrically insulated from each other, thereby isolating the circuit; its core is a high-frequency, high-loss core, thereby suppressing high-frequency noise entering and exiting the control circuit and improving the stability of the control system; the output of the isolation transformer is suspended to ground, suitable for applications with a small power supply range and short lines. In this case, the system's ground capacitance current is too small to cause personal injury, protecting personal safety and isolating dangerous voltages.

[0027] Preferably, the isolation transformer is a Chint NDK-25 isolation control transformer.

[0028] Preferably, the transmitter is a QFM2160 temperature and humidity controller. This controller has four terminals: AV24V power output, 0-100% humidity signal output, and 0-50℃ temperature signal output.

[0029] The beneficial effects that this application can produce include:

[0030] 1) When the automatic control system of the air handling unit fails and cannot be repaired in time, this application can replace the original automatic control system and quickly establish a local high-precision and high-stability automatic control system.

[0031] 2) The power converter uses an isolation transformer, which is electrically insulated from the primary side and the secondary side. Its core is a high-frequency loss core, and the output of the isolation transformer is suspended to ground. This suppresses high-frequency noise from entering and exiting the control circuit, improves the stability of the control system, protects personal safety, and isolates dangerous voltages.

[0032] 3) Temperature and humidity adjustment can be programmed and controlled online, with a wide dynamic range, quick and convenient operation, and high precision. Attached Figure Description

[0033] Figure 1 A diagram showing the composition of a rapid emergency response control device for low-voltage electrical faults in an air handling unit.

[0034] Figure 2 This is a control logic diagram for a rapid emergency response control device for low-voltage electrical faults in an air handling unit. Detailed Implementation

[0035] The present application is described in detail below with reference to the embodiments and accompanying drawings, but the present application is not limited to these embodiments.

[0036] Figure 1 This is a diagram illustrating the composition of a rapid emergency response control device for low-voltage electrical faults in an air handling unit, as described in this application. The device includes: a unit controller, a power converter, a transmitter, and a target control device interface module. The unit controller is connected to the power converter, transmitter, and target control device interface module. The unit controller's input and output signals include:

[0037] At least one of the digital I / O signal or analog quantity for winter / summer mode conversion and digital I / O signal or analog quantity for day / night mode conversion is inverted into a heating / cooling output signal by the unit controller;

[0038] The main signal input is responsible for the signal input function of the transmitter.

[0039] Auxiliary signal input is used to add remote indoor temperature and humidity signal transmission, which, combined with the maximum priority control of the unit controller, enables precise adjustment;

[0040] Analog signal output provides a DC 0-10V analog signal to the proportional analog actuator;

[0041] Positive digital signal output, used to control digital signal damper controllers or digital signal humidifiers;

[0042] Reverse digital signal output, used to control digital signal damper controllers or digital signal humidifiers;

[0043] The signals input to the transmitter include at least one of the following: DC power supply, temperature control signal and humidity control signal, water valve drive signal, and air valve drive signal;

[0044] The input and output signals of the unit controller, as well as the output signals of the transmitter, are connected to the external target control device through the target control device interface module.

[0045] In one embodiment, the core of the unit controller is a field-preset program unit controller; it is pre-programmed with temperature control program and humidity control program, which are used to realize winter / summer or analog quantity, day / night switching according to digital I / O signals; and generate analog signal output and digital signal output according to temperature control program and humidity control program.

[0046] In one embodiment, the field preset program unit controller is an RWD series unit controller manufactured by Siemens AG, Germany. Among Siemens' many products, the RWD series field preset program unit controller offers relatively high cost-effectiveness, ease of operation, comprehensive built-in programs, and a relatively high degree of development and utilization.

[0047] In one embodiment, the digital actuator is used to control a digital signal damper controller or a digital signal humidifier.

[0048] In one embodiment, the digital actuator is a Siemens 090707C model.

[0049] In a preferred embodiment, the temperature control program includes program segment #16, which, when used as the main control program for the temperature digital signal, enables control of the Siemens 090707C digital actuator with an accuracy of ±0.5°C.

[0050] In one embodiment, an AC24V intermediate relay is added to the Siemens 090707C digital actuator to form an electrically controlled valve with digital I / O signal input.

[0051] In a preferred embodiment, the temperature control program includes program segment #36 within the program, which, when used as the main control program for the temperature digital signal, can control various analog signal proportional actuators such as Siemens GBB161.1E and SQX61 with an accuracy of ±0.5℃.

[0052] In one embodiment, the humidity control program is used to change the transmitter's measurement unit and rated measurement range.

[0053] In one embodiment, the power converter includes an isolation control transformer, whose primary and secondary sides are electrically insulated from each other, thereby isolating the circuit; its core is a high-frequency, high-loss core, thereby suppressing high-frequency noise entering and exiting the control circuit and improving the stability of the control system; the output of the isolation transformer is suspended to ground, suitable for applications with a small power supply range and short lines. In this case, the system's ground capacitance current is too small to cause personal injury, protecting personal safety and isolating dangerous voltages.

[0054] In one embodiment, the isolation transformer is a Chint NDK-25 isolation control transformer.

[0055] In one embodiment, the transmitter uses a QFM2160 temperature and humidity controller. This controller has four terminals: G and G0: AV24V power supply circuit; U1: 0-100% humidity signal output; and U2: 0-50℃ temperature signal output.

[0056] This application also provides the workflow of the aforementioned air handling unit's emergency rapid response control device for weak current faults, including:

[0057] (1) For the application scenario, the target control equipment interface module of the air handling unit weak current fault emergency rapid handling control device is connected to the control port of the air handling unit; (2) The temperature is set and regulated through the temperature control program; (3) The humidity is set and regulated through the humidity control program.

[0058] Figure 2 It is a control logic diagram drawn based on the environmental data requirements of the air handling unit.

[0059] The experimental verification process is as follows:

[0060] The indoor experimental area has a usable area of ​​approximately 60 square meters. A digital multimeter is used instead of the RWD68 receiver to receive both digital and analog signals. The experimental environment is simulated by a 5HP split-type cabinet air conditioner to monitor the required temperature and humidity data. One FLUKE62MAX+ infrared thermometer and one UNI-T-UY332 temperature and humidity sensor are used for calibrating the accuracy of temperature and humidity data during the experiment. The unit controller's point allocation is as follows:

[0061] M-D1: Digital I / O input, used for switching between winter / summer mode and day / night mode;

[0062] M-X1: Main signal input (terminal G is required when connecting an active sensor), used to handle the signal input of QFM2160;

[0063] M-X2: Auxiliary signal input, which can add remote indoor temperature and humidity signal transmission, combined with the maximum priority control of the unit controller to achieve precise adjustment;

[0064] M-Y1: Analog signal output, providing DC 0-10V analog signal to the proportional analog actuator;

[0065] Q11-Q12: Positive digital signal output, used to control digital signal damper controllers or digital signal humidifiers;

[0066] Q11-Q14: Reverse digital signal output, used to control digital signal damper controllers or digital signal humidifiers.

[0067] Experimental verification of the pre-set program segments #16 and #36 was carried out.

[0068] (1) #16 Program Experiment

[0069] At the start of the experiment, the temperature sensor measured a room temperature of 25.1℃, the infrared thermometer measured 24.5℃, and X1 measured 24.8℃. Q1 was ON. The SP-C temperature was set to 24℃, and Q1 displayed ON. The unit controller began outputting digital signals. Using a digital multimeter in continuity mode, points Q11-Q14 were found to be ON, while points Q11-Q12 were ON, indicating normal forward digital signal output. The air conditioner was then turned on to raise the room temperature. After 12 minutes and 5 seconds, X1 measured a room temperature of 24.3℃, and Q1 displayed OFF. The unit controller stopped outputting digital signals. Using a digital multimeter, points Q11-Q14 were found to be ON, while Q11-Q12 were found to be ON, indicating normal reverse digital signal output. Shorting points M-D1 resulted in sensitive day / night mode switching in program segment #16. This indicates that the temperature control experiment in program segment #16 was successful.

[0070] The unit of measurement of the unit controller was changed from ℃ to %, and a humidity adjustment test was conducted on the sensor manually. The digital signal output was normal, indicating that the modified program segment can realize the transmission of digital humidification signals.

[0071] Experimental data shows that the temperature data measured by program segment X1 and the accuracy of the Q1 signal output meet the design requirements of the air handling unit.

[0072] (2) Test of program segment #36

[0073] At the start of the experiment, the temperature sensor measured a room temperature of 24.8℃, the infrared thermometer measured 24.2℃, X1 measured 24.5℃, and Y1 displayed 0. The SP-C temperature was set to 23.5℃. Y1 gradually changed from 0 to 10, indicating that the unit controller began outputting a 0-10V analog signal. Using a digital multimeter in DC voltage mode, M-Y1 gradually increased from 0V to 10V, indicating that the analog signal output was normal. The air conditioner was turned on to raise the room temperature. After 8 minutes and 50 seconds, when X1 measured a room temperature of 23.6℃, ​​Y1 displayed 5, indicating that the analog signal output voltage had dropped to approximately DC 5V. The digital multimeter measured the output voltage at this point as DC 4.96V. After 10 minutes and 15 seconds, X1 measured a room temperature of 24.1℃, and Y1 displayed 0. Using a digital multimeter, the M-Y1 output voltage was measured as 0, indicating that the unit controller stopped outputting analog signals. This experiment concluded that the analog signal program segment test was successful.

[0074] Experimental data shows that the accuracy of the data measured by the modified program segment X1 and the output of the Y1 signal meets the design requirements of the air handling unit.

[0075] The above description is merely a typical embodiment of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. An air handling unit weak current fault emergency rapid processing control device, characterized in that, It comprises: a unit controller, a power converter, a transmitter and a target control device interface module; the unit controller is connected with the power converter, the transmitter and the target control device interface module respectively; the input and output signals of the unit controller and the output signals of the transmitter are connected with an external target control device through the target control device interface module; the input and output signals of the unit controller comprise: at least one of digital I / O signals or analog quantities for winter / summer mode conversion or digital I / O signals or analog quantities for day / night mode conversion, which are inverted by the unit controller into heating / cooling output signals; a main signal input for receiving signal input of the transmitter; an auxiliary signal input for adding remote indoor temperature and humidity signal transmission and realizing accurate regulation in combination with maximum priority control of the unit controller; an analog signal output for providing DC 0-10V analog signals to an output analog signal proportional actuator, at least including a set of forward proportional analog signals and a set of reverse proportional analog signals; a digital signal output for outputting digital signals to a digital actuator, at least including a set of forward digital signals and a set of reverse digital signals; signals input to the transmitter comprise at least one of the following: DC power supply, temperature control signal, humidity control signal, water valve driving signal and air valve driving signal.

2. The weak current fault emergency rapid treatment control device for air handling unit according to claim 1, characterized in that, The core of the unit controller adopts a field preset program unit controller, which is preset with a temperature control program and a humidity control program, for realizing winter / summer and day / night switching according to received digital I / O signals or analog quantities and generating analog signal output and digital signal output according to the temperature control program and the humidity control program.

3. The weak current fault emergency quick processing control device for air handling unit according to claim 2, characterized in that, The field preset program unit controller adopts an RWD series unit controller.

4. The weak current emergency quick processing control device for air handling unit fault according to claim 1, characterized in that, The digital actuator is used for controlling a digital signal air valve controller or a digital signal humidifier.

5. The weak current emergency quick processing control device for air handling unit fault according to claim 1 or 4, characterized in that, The digital actuator adopts a Siemens 090707C type, and the temperature control program sets the control accuracy to ±0.5℃.

6. The weak current emergency quick processing control device for air handling unit fault according to claim 5, characterized in that, A set of AC 24V intermediate relays are additionally installed on the basis of the Siemens 090707C type digital actuator to form an electrically controlled valve with digital I / O signal input.

7. The weak current emergency quick processing control device for air handling unit fault according to claim 2, characterized in that, The humidity control program is used for changing the measurement unit and the rated measurement range of the transmitter.

8. The weak current emergency quick processing control device for air handling unit fault according to claim 1, characterized in that, The power converter comprises an isolation control transformer, the primary side and the secondary side of which are electrically insulated from each other, the core of which is a high-frequency high-loss core, and the output of the isolation transformer is floating to the ground.

9. The weak current emergency quick processing control device for air handling unit fault according to claim 7, characterized in that, The isolation transformer selects a CHINT NDK-25 isolation control transformer.

10. The weak current emergency quick processing control device for air handling unit fault according to claim 1, characterized in that, The transmitter adopts a QFM2160 temperature and humidity controller.

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