A portable test system for air conditioner detection

Abstract

A portable test system for air conditioner detection, comprising a signal output module, a display module, a switch, a rubber jack and a power module, wherein the signal output module outputs analog signals to the equipment to be detected; the display module can view the actual output current in the operation of the control loop; the switch can turn on or off the input signal of the control system of the equipment to be detected; the rubber jack is used for connecting the test system with the equipment to be detected after the test system is inserted into the circuit; the power module is used for connecting the test system and the equipment to be detected in the same circuit; and the signal output module, the display module and the switch are connected with the corresponding rubber jack respectively. The present application has simple structure and good portability, can accurately test the effective operation data of the refrigeration machine control system through the switch quantity, temperature and pressure, judge the operation performance of the refrigeration machine control system, determine the problem fault and draw the principle diagram of the refrigeration machine control system.

Description

Technical Field

[0001] This invention belongs to the field of refrigeration equipment repair, and in particular relates to a portable testing system for air conditioner testing. Background Technology

[0002] In today's society, large-scale central air conditioning systems are becoming increasingly common in production and daily life. Shopping malls and factories have an uninterrupted demand for air conditioning, and the requirements for temperature and pressure control are becoming increasingly stringent. Consequently, temperature and pressure signals are being used more and more extensively in large-scale central air conditioning systems. Therefore, the maintenance and commissioning of large-scale central air conditioning systems are becoming increasingly important in both production processes and daily life services.

[0003] In the daily maintenance of refrigeration equipment, the system debugging of the refrigeration equipment itself requires the input of various signals, such as water flow signals, temperature signals, pressure signals, etc. These signals are often not available when the equipment is not actually running under load. In actual use, the equipment cannot actually run under load or provide power, which makes it impossible to accurately monitor whether the control system is operating normally. Therefore, how to monitor whether the control system and signal processing system of the refrigeration unit are operating normally when there is no load or even no power is an urgent problem to be solved.

[0004] During on-site commissioning, it is common for customers to lose their original data on refrigeration equipment, and existing testing tools are unable to confirm the functions of each access port of the system, making it impossible to accurately debug the equipment and creating potential risks for continued use.

[0005] Meanwhile, most existing testing equipment is bulky, numerous, and inconvenient to carry. Summary of the Invention

[0006] The purpose of this invention is to provide a portable testing system for air conditioner testing, so as to solve the technical problems of portability of testing tools and comprehensive and efficient detection of the operating status of refrigeration equipment.

[0007] To achieve the above objectives, the specific technical solution of a portable testing system for air conditioner testing according to the present invention is as follows:

[0008] A portable testing system for air conditioner testing, comprising:

[0009] Signal output module: The signal output module outputs an analog signal to the device under test;

[0010] Display module: The display module can view the actual output current during operation of the control loop;

[0011] Switch: The switch can connect or disconnect the input signal to the control system of the device under test;

[0012] Rubber socket: The rubber socket is used for connecting the test system to the device under test after the circuit is inserted;

[0013] Power module: The power module is used to connect the test system and the device under test in the same circuit;

[0014] The signal output module, display module, and switch are respectively connected to the corresponding rubber sockets;

[0015] The testing steps for this portable testing system are as follows:

[0016] S1. Insert the wire into the rubber socket corresponding to the switch, and connect the other end of the wire to the external control system of the device under test. Select the corresponding number of switches according to the PLC switch input signal requirements of the device under test.

[0017] S2. Connect the wire to the rubber socket corresponding to the signal output module, and connect the other end of the wire to the input point of the signal acquisition module of the device under test. Select the number of signal output modules to be used according to the requirements of the central air conditioning electrical control system.

[0018] S3. Connect the wire to the rubber socket corresponding to the display module, and connect the other end of the wire to the current output terminal of the DA module of the device under test. Select the number of display modules to be applied according to the control system requirements.

[0019] S4. Connect the DC24V of the electrical control system of the device under test to the DC24V output terminal of the power module of the test system.

[0020] S5. Simulate temperature, pressure, and percentage signals of various parts of the device under test through the signal output module. Observe the signal data on the display screen of the electrical control system of the device under test. Then adjust the current of the signal output module and observe the dynamic signal data on the display screen of the device under test, as well as the values ​​displayed by the display module of the test system. This will confirm the specific function of the signal of the part monitored by the signal output module.

[0021] S6. By switching the toggle switch, the PLC switch input terminals in the electrical control system of the device under test can be connected and disconnected. With the display of the system under test, the specific function of any switch input point of the PLC can be accurately determined.

[0022] S7. Based on the above steps, obtain the operating status of the equipment under test in various aspects. Under static operation of the equipment under test, cooperate with the display module to accurately obtain the operating performance of the equipment under test in various aspects. Based on the data, organize the equipment principle information and draw the schematic diagram of the electrical control system.

[0023] In order to identify the functions of all parts of the device under test, the number of signal output modules is at least 16.

[0024] To better connect the testing system to the device to be tested, the rubber socket is a round hole with a diameter of 4mm.

[0025] Further confirmation of the functional modules of the device under test: The signal output module mentioned in S5 monitors the following components: inlet temperature of the low-temperature generator, inlet temperature of the cooling water, inlet temperature of the cold and warm water, outlet temperature of the cold and warm water, condensate temperature of the refrigerant, evaporation temperature of the refrigerant, outlet temperature of the cooling water, outlet temperature of the absorber, outlet temperature of the dilute solution low-temperature heat exchanger, inlet temperature of the concentrated solution low-temperature heat exchanger, dew point temperature of the high-temperature generator, inlet temperature of the high-temperature generator, outlet temperature of the high-temperature generator, outlet temperature of the condensate heat exchanger, pressure of the gas storage chamber, and opening degree of the steam valve.

[0026] Further confirmation of the switch signals of the device under test: In S6, by turning the switch on and off, it is possible to determine the external cold water flow switch signal, cooling water flow switch signal, high-voltage switch signal, low refrigerant level switch signal, high-level switch signal, low-level switch signal, high-level switch signal, high-level switch signal, high-level switch signal, low-level switch signal, high-level switch signal in the mixing tank, low-level switch signal in the mixing tank, vibration sensor signal, and cold water outlet temperature control switch signal.

[0027] To better achieve analog signal output and display current changes in the control loop, the signal output module is a 4-20mA signal generator, and the display module is a 4-20mA ammeter.

[0028] To further save space and achieve portability, the switch is a two-position switch that connects and disconnects the input signal of the control system of the device under test by switching the circuit.

[0029] In order to ensure that the test system and the device under test are in the same circuit, the power supply module outputs DC24V.

[0030] Beneficial effects:

[0031] This system has a simple structure and small size, and can be placed in a portable toolbox. It accurately tests the effective operating data of the control system of the device under test by measuring switch quantity, temperature, and pressure. It can scientifically judge the operating performance of the refrigeration control system and accurately identify the location of problems and faults. Based on these scientific and effective test data, it can not only comprehensively test the operating status of the refrigeration control system, but also draw the schematic diagram of the refrigeration control system. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a portable testing system for air conditioner testing according to the present invention; Detailed Implementation

[0033] To better understand the purpose, structure, and function of this invention, a portable testing system for air conditioning testing will be described in further detail below with reference to the accompanying drawings.

[0034] Implementation example:

[0035] This application discloses a portable testing system for air conditioner testing, which can be placed in an ABS plastic waterproof electrical box and is convenient to carry when testing air conditioner equipment outdoors.

[0036] The signal output module is a 4-20mA signal generator. By rotating the knob clockwise and counterclockwise, the output current of the signal generator can be changed, accurately simulating the temperature, pressure and other signals of various parts of the equipment under test.

[0037] The display module is a 4-20mA ammeter. When the signal generator outputs a signal and an output current is obtained, the ammeter accurately displays the value of the output current, which, together with the signal generator, confirms the operating status of the device under test.

[0038] The power module provides DC24V power to the test system. When in use, the positive and negative terminals are connected to the corresponding positive and negative terminals of the device under test.

[0039] The following example, using the testing process of Ebara Central Air Conditioner RGW058S, illustrates the usage of this portable testing system for air conditioning testing.

[0040] The principle of the testing system is as follows Figure 1 As shown, the test system is first connected to the electrical control system of the Ebara central air conditioner RGW058S to be tested.

[0041] For toggle switch 1, insert wires into the 4mm diameter rubber sockets (-1 and -2) at the output end. Connect the other end of the wire to the D24A- and X16 input terminals of the Ebara RGW058S central air conditioner control system for external control. For toggle switch 2, insert wires into the 4mm diameter rubber sockets (-3 and -4) at the output end. Connect the other end of the wire to the D24A- and X17 input terminals of the Ebara RGW058S central air conditioner control system for external control. Continue this process, inserting wires into the 4mm diameter rubber sockets (-1, -2, -19, -20) at the output ends of toggle switches 1-10. Connect the other end of the wire to the D24A- and Xn input terminals of the RGW058S central air conditioner control system for external control. The test system's toggle switches can be selected in appropriate quantities based on the requirements of the PLC's switching signal input conditions in the central air conditioning electrical control system.

[0042] The 4-20mA signal generator I1-1 output terminal (I1, a 4mm diameter round rubber plug) is plugged into the wire. The other end of the wire is connected to the I0 input point of the AFP04 FPO-A80 signal acquisition module in the Ebara central air conditioning RGW058S electrical control system (V0 and I0 are shorted to obtain a 4-20mA signal). The 4-20mA signal generator I1-2 output terminal (I2, a 4mm diameter round rubber plug) is plugged into the wire. The other end of the wire is connected to the I1 input point of the AFP04 FPO-A80 signal acquisition module in the Ebara central air conditioning RGW058S electrical control system (V1 and I1 are shorted to obtain a 4-20mA signal). The test system's 4-20mA signal generators I1-I16 can monitor temperature and pressure at a total of 16 points. The number of 4-20mA signal generators used is selected according to the requirements of the central air conditioning electrical control system.

[0043] Connect the wires to the A1000 output terminals (A1000+A1000-, 4mm diameter banana plug) of the 4-20mA digital display meter. Connect the other end of the wires to the CH0 current output terminals (I and COM) of the DA2 module in the central air conditioning control system being tested. Similarly, connect the wires to the A1001 output terminals (A1001+A1001-, 4mm diameter banana plug) of the 4-20mA digital display meter. Connect the other end of the wires to the CH1 current output terminals (I and COM) of the DA2 module in the same system (note the positive and negative terminals). Select the appropriate number of 4-20mA digital display meters based on the requirements of your control system.

[0044] The test system power supply is DC24V. The positive terminal of the DC24V power supply of the test system is connected to the positive output terminal of the DC24V power module of the Ebara central air conditioner RGW058S electrical control system, and the negative terminal of the DC24V power supply of the test system is connected to the negative output terminal of the DC24V power module of the Ebara central air conditioner RGW058S electrical control system.

[0045] Power-on test: The Ebara central air conditioning RGW058S electrical control system is powered on.

[0046] The testing system utilizes the PLC's A / D conversion function. Through a signal acquisition module, it converts 4-20mA analog signals into temperature and pressure signals. The 4-20mA signal generator accurately simulates the temperature and pressure signals of various parts of the Ebara RGW058S central air conditioner by outputting 4-20mA analog signals. Monitoring on the Ebara RGW058S central air conditioner's electrical control system screen shows that the temperature and pressure signal inputs of various parts of the Ebara RGW058S central air conditioner are normal. The output current of the 4-20mA signal generator I1-1 is changed by rotating the knob clockwise and counterclockwise. The dynamic signal data displayed on the Ebara Central Air Conditioner RGW058S electronic control system screen confirms that the 4-20mA signal generator I1-1 monitors the inlet temperature of the low-temperature generator. The output current signal of the 4-20mA signal generator I1-2 is changed by rotating the knob clockwise and counterclockwise. The dynamic signal data displayed on the Ebara Central Air Conditioner RGW058S electronic control system screen is then observed. This confirms that the 4-20mA signal generator I1-2 monitors the cooling water inlet temperature. Similarly, I1-1 through I-16 correspond to the following temperatures for the Ebara central air conditioning RGW058S: low-temperature generator inlet temperature, cooling water inlet temperature, chilled / warm water inlet temperature, chilled / warm water outlet temperature, refrigerant condensation temperature, refrigerant evaporation temperature, cooling water outlet temperature, absorber outlet temperature, dilute solution low-temperature heat exchanger outlet temperature, concentrated solution low-temperature heat exchanger inlet temperature, high-temperature dew point temperature, high-temperature inlet temperature, high-temperature outlet temperature, condensate heat exchanger outlet temperature, gas storage chamber pressure, and steam valve opening. The 4-20mA signal generator simulates the specific meanings of the signals monitored at each input point of the signal acquisition module for each part of the Ebara central air conditioning RGW058S, and these are recorded and used to create a CAD control schematic diagram for future reference. The 4-20mA signal generator can accurately simulate the corresponding values ​​required for detection.

[0047] The testing system is equipped with a fault alarm function based on the PLC logic control characteristics. By moving the toggle switch up and down, the PLC's digital input terminals in the Ebara RGW058S central air conditioner control system are switched on and off, thus achieving circuit switching. Moving toggle switch 1 up and down connects and disconnects the external digital input signals D24A- and X16 of the PLC in the Ebara RGW058S central air conditioner control system. Checking the alarm screen on the RGW058S central air conditioner control system confirms that the external input signals D24A- and X16 are the external chilled water flow digital input signals of the Ebara RGW058S central air conditioner. By moving toggle switch 2 up and down, the external switch input signals D24A- and X17 of the PLC in the Ebara RGW058S central air conditioner control system are switched on and off. Checking the alarm screen on the RGW058S central air conditioner control system confirms that the external switch input signals D24A- and X17 are the cooling water flow switch signals of the Ebara RGW058S central air conditioner. Similarly, by testing the on / off action of toggle switches 3-10, and by checking the alarm screen on the Ebara RGW058S central air conditioner control system, it is determined that D24A- and X1A are the high-pressure switch signals of the Ebara RGW058S central air conditioner, D24A- and X1B are the low refrigerant level switch signals, and D24A- and X3 are the high-level refrigerant level switch signals. The high-level switching signal, D24A-, and X4 are the high-level low-level switching signals for the Ebara RGW058S central air conditioning system; D24A- and X5 are the high-level switching signals for the mixing tank of the Ebara RGW058S central air conditioning system; D24A- and X6 are the low-level switching signals for the mixing tank; D24A- and XF are the vibration sensor signals for the Ebara RGW058S central air conditioning system; and D24A- and X19 are the chilled water outlet temperature control switching signals for the Ebara RGW058S central air conditioning system. By using the toggle switch to turn the PLC on and off, the specific meaning of any switching input point can be accurately determined, recorded, and used to create a CAD control schematic diagram for future reference.

[0048] The test system's 4-20mA signal generator output a 4-20mA current to simulate the temperature, pressure, and other signal displays of various parts of the Ebara central air conditioner RGW058S, and all were normal. The RGW058S electrical control system's PLC switch signals for chilled water flow, cooling water flow, high-pressure, low refrigerant level, low high-pressure level, low mixing tank level, vibration sensor signal, and chilled water outlet temperature control were all normally input, basically meeting the static operating conditions of the Ebara central air conditioner RGW058S.

[0049] Under static operation, when the Ebara central air conditioning RGW058S is turned off, the refrigerant level report indicates a low refrigerant level, and the refrigerant pump immediately shuts off. This indicates that the evaporator level controls the start and stop of the chiller pump. Turning on the toggle switch 5 detects a high refrigerant level for a period >15 minutes but <20 minutes, then disconnects to return to the normal level. During operation, if the toggle switch 5 remains on for <15 minutes at a high refrigerant level, it disconnects to return to the normal level, reporting a low refrigerant level. If the toggle switch 5 remains on for >20 minutes at a high refrigerant level, it reports a malfunction in high refrigerant level control. Therefore, it is evident that under static operation, the on / off actions of toggle switches 1-10 can accurately determine the specific meaning of any PLC switch input point and the performance of the control node.

[0050] By rotating the 4-20mA signal generator I1-16 knob clockwise and counterclockwise, the output current signal of the 4-20mA signal generator is accurately determined. If the steam regulating valve opening feedback signal of the Ebara central air conditioner RGW058S is ≥5%, the Ebara central air conditioner RGW058S will be restricted from operation. If the steam condensate temperature is higher than 90℃, the Ebara central air conditioner RGW058S will report a steam regulating valve malfunction. By rotating the 4-20mA signal generator I1-13 knob clockwise and counterclockwise, the output current signal of the 4-20mA signal generator is accurately determined. If the high-temperature outlet temperature of the Ebara central air conditioner RGW058S is >90℃ and <110℃, it will enter soft start 5. If the high-temperature outlet temperature of the Ebara central air conditioner RGW058S reaches 110℃, SC50 will be heating (entering normal operation). The output current signal (dew point temperature) of the D / A module is accurately obtained by rotating the knob of the 4-20mA signal generator I1-11 clockwise and counterclockwise. This output current is then precisely displayed on a 4-20mA digital display. The D / A module output current is correlated with the inverter output frequency, which controls the operating power of the canned motor pump. The dew point temperature of the Ebara central air conditioner RGW058S is used to control the canned motor pump's operating speed, and the analog current signal from the 4-20mA signal generator I1-11 and the displayed value on the 4-20mA digital display confirm this. Therefore, by simulating a 4-20mA analog signal using the 4-20mA signal generator I1-1-I-16, the operating status and control logic of various aspects of the unit can be accurately determined.

[0051] Therefore, it can be seen that using a toggle switch to simulate PLC switching signals and a 4-20mA signal generator to simulate 4-20mA analog signals not only meets the static operating conditions of the chiller control system, but also accurately judges the operating status of various aspects of the unit under static operation. By using a toggle switch to simulate PLC switching signals and a 4-20mA signal generator to simulate 4-20mA analog signals, a 4-20mA digital display accurately obtains the chiller's operating performance and the necessary relevant factors affecting the operating status of each control node. Based on the scientific and effective data obtained from the simulated operation of the test system, the chiller's operating principle data was compiled, and the schematic diagram of the electrical control system was drawn.

[0052] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A portable testing system for air conditioner testing, characterized in that, include: Signal output module: The signal output module outputs an analog signal to the device under test; Display module: The display module can view the actual output current during operation of the control loop; Switch: The switch can connect or disconnect the input signal to the control system of the device under test; Rubber socket: The rubber socket is used for connecting the test system to the device under test after the circuit is inserted; Power module: The power module is used to connect the test system and the device under test in the same circuit; The signal output module, display module, and switch are respectively connected to the corresponding rubber sockets; The testing steps for this portable testing system are as follows: S1. Insert the wire into the rubber socket corresponding to the switch, and connect the other end of the wire to the external control system of the device under test. Select the corresponding number of switches according to the PLC switch input signal requirements of the device under test. S2. Connect the wire to the rubber socket corresponding to the signal output module, and connect the other end of the wire to the input point of the signal acquisition module of the device under test. Select the number of signal output modules to be used according to the requirements of the central air conditioning electrical control system. S3. Connect the wire to the rubber socket corresponding to the display module, and connect the other end of the wire to the current output terminal of the DA module of the device under test. Select the number of display modules to be applied according to the control system requirements. S4. Connect the DC24V of the electrical control system of the device under test to the DC24V output terminal of the power module of the test system. S5. Simulate temperature, pressure, and percentage signals of various parts of the device under test through the signal output module. Observe the signal data on the display screen of the electrical control system of the device under test. Then adjust the current of the signal output module and observe the dynamic signal data on the display screen of the device under test, as well as the values ​​displayed by the display module of the test system. This will confirm the specific function of the signal of the part monitored by the signal output module. S6. By switching the toggle switch, the PLC switch input terminals in the electrical control system of the device under test can be connected and disconnected. With the display of the system under test, the specific function of any switch input point of the PLC can be accurately determined. S7. Based on the above steps, obtain the operating status of the equipment under test in various aspects. Under static operation of the equipment under test, cooperate with the display module to accurately obtain the operating performance of the equipment under test in various aspects. Based on the data, organize the equipment principle information and draw the schematic diagram of the electrical control system.

2. The portable testing system for air conditioner testing according to claim 1, characterized in that, The number of signal output modules is at least 16.

3. The portable testing system for air conditioner testing according to claim 1, characterized in that, The rubber socket is a round hole with a diameter of 4mm.

4. A portable testing system for air conditioner testing according to claim 2, characterized in that, The signal output module described in S5 monitors the following components: inlet temperature of the cryogenic generator, inlet temperature of the cooling water, inlet temperature of the cold and warm water, outlet temperature of the cold and warm water, condensate temperature of the refrigerant, evaporation temperature of the refrigerant, outlet temperature of the cooling water, outlet temperature of the absorber, outlet temperature of the dilute solution cryogenic heat exchanger, inlet temperature of the concentrated solution cryogenic heat exchanger, dew point temperature of the high-temperature generator, inlet temperature of the high-temperature generator, outlet temperature of the high-temperature generator, outlet temperature of the condensate heat exchanger, pressure of the gas storage chamber, and opening degree of the steam valve.

5. A portable testing system for air conditioner testing according to claim 1, characterized in that, In S6, by turning the switch on and off, it is possible to determine the following signals: external cold water flow rate switch signal, cooling water flow rate switch signal, high-pressure switch signal, low refrigerant level switch signal, high-level switch signal, low-level switch signal, high-mixing tank level switch signal, low mixing tank level switch signal, vibration sensor signal, and cold water outlet temperature control switch signal.

6. A portable testing system for air conditioner testing according to claim 1, characterized in that, The signal output module is a 4-20mA signal generator, and the display module is a 4-20mA ammeter.

7. A portable testing system for air conditioner testing according to claim 1, characterized in that, The switch is a two-position switch, which connects and disconnects the input signal of the control system of the device under test by switching the circuit.

8. The portable testing system for air conditioner testing according to claim 1, wherein the power supply module outputs a DC24V power supply.

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