A compressor factory experiment debugging device

Abstract

A compressor factory testing and debugging device includes a 4-20mA current signal simulation circuit, a 4-20mA current signal measurement circuit, a resistance temperature sensor signal simulation circuit, a voltage signal simulation circuit, a DC bias signal simulation circuit, first to sixth electrical terminals, a display component, and a controller. The 4-20mA current signal simulation circuit, the 4-20mA current signal measurement circuit, the voltage signal simulation circuit, and the DC bias signal simulation circuit are respectively connected to the first, second, fifth, and sixth electrical terminals. The resistance temperature sensor signal simulation circuit is respectively connected to the third and fourth electrical terminals. All three circuits are connected to the controller; the controller is connected to the display component. This invention offers strong versatility, high debugging efficiency, and high debugging accuracy.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology. Background Technology

[0002] As a key piece of equipment for gas pressurization, compressors have wide applications in the process industry. Their factory testing presents unique technical challenges: the non-standardized architecture of screw compressor control systems and the diversity of controlled objects significantly extend the system commissioning cycle. Complete factory testing requires systematic verification of multiple modal signals of the control system, including digital I / O, analog input / output, RTD temperature signals, voltage signals, and pulse signals. This is crucial for ensuring the reliability of the equipment.

[0003] Current mainstream debugging solutions rely on standard signal generators. During implementation, temporary wiring is required to connect the signal source to the screw compressor control system under test, and parameter verification is performed using an engineering computer. This approach has the following main drawbacks: 1. Existing solutions require multiple signal generators to simulate different signal types, and each generator only provides dual-channel output. Multiple connections between the signal generator and the screw compressor control system are needed to complete the debugging, resulting in low efficiency. 2. The large number of cables and interfaces used during debugging increases the risk of connection failures and data loss, leading to poor connection reliability and impacting debugging efficiency. 3. Low system integration results in a large overall size and increased maintenance costs. 4. Inflexible parameter adjustment of the signal affects the debugging effect and accuracy. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a compressor factory test and debugging device with strong versatility, high debugging efficiency and accuracy, small product size and low use and maintenance costs.

[0005] A compressor factory test and debugging device according to an embodiment of the present invention includes a 4-20mA current signal simulation circuit, a 4-20mA current signal measurement circuit, a resistance temperature sensor signal simulation circuit, a voltage signal simulation circuit, a DC bias signal simulation circuit, first to sixth electrical terminals, a display component, and a controller. The 4-20mA current signal simulation circuit, the 4-20mA current signal measurement circuit, the voltage signal simulation circuit, and the DC bias signal simulation circuit are respectively connected to the first electrical terminal, the second electrical terminal, the fifth electrical terminal, and the sixth electrical terminal. The resistance temperature sensor signal simulation circuit is connected to the third electrical terminal and the fourth electrical terminal. The signal output terminals of the 4-20mA current signal simulation circuit, the 4-20mA current signal measurement circuit, the resistance temperature sensor signal simulation circuit, the voltage signal simulation circuit, and the DC bias signal simulation circuit are respectively connected to the signal input terminals of the controller. The controller is connected to the display component.

[0006] The compressor factory test and debugging device described above includes a digital signal analog circuit, a digital signal measurement circuit, a seventh electrical terminal, and an eighth electrical terminal; the digital signal analog circuit is connected to the seventh electrical terminal, the digital signal measurement circuit is connected to the eighth electrical terminal, and the signal output terminals of the digital signal analog circuit and the digital signal measurement circuit are respectively connected to the signal input terminal of the controller.

[0007] In the aforementioned compressor factory test and debugging device, the first to eighth electrical terminals are all push-button quick-connect electrical terminals.

[0008] Compared with the prior art, this utility model has the following advantages and features:

[0009] 1. High debugging efficiency. This utility model embodiment adopts a debugging device integrating multiple electronic circuits, realizing the output of multi-mode signals (4-20mA industrial current signal, analog voltage signal, RTD temperature sensor signal, digital signal, etc.), and the number of analog signals is sufficient, so most of the debugging can be completed with a single connection, which greatly improves the debugging efficiency. At the same time, due to the use of push-button quick-connect electrical terminals, the connection of the equipment and data transmission are simpler and faster, reducing the complexity and workload of debugging, and further improving the debugging efficiency;

[0010] 2. High versatility. One set of debugging equipment in this embodiment can be applied to various compressor control systems without requiring special customization and adjustment for different test areas, thus improving the equipment's versatility and flexibility.

[0011] 3. Low usage and maintenance costs. Because the debugging device of this embodiment can simulate a wide range of signal types, has high integration, is easy to use, and is small in size, it reduces the large space and complex installation process required by a large number of signal generators, and lowers the hardware cost and maintenance expenses of the equipment.

[0012] 4. Reduced connection failures and data loss. This embodiment of the invention uses push-button quick-connect terminals, reducing the use of cables and interfaces, thereby lowering the risk of connection failures and data loss, and improving the stability and reliability of data transmission;

[0013] 5. High debugging accuracy. The various signal simulation circuits in this embodiment can adjust parameters such as signal magnitude, amplitude, and frequency, better simulating signals under actual working conditions, enabling comprehensive monitoring and debugging of the compressor, and improving the debugging effect and accuracy. Attached Figure Description

[0014] Figure 1 A schematic block diagram of a compressor factory test and debugging device according to an embodiment of the present invention is shown.

[0015] Figure 2 A circuit diagram of a 4-20mA current signal analog circuit according to an embodiment of the present invention is shown.

[0016] Figure 3 A circuit diagram of a 4-20mA current signal measurement circuit according to an embodiment of the present invention is shown.

[0017] Figure 4 A circuit diagram of a signal simulation circuit for a resistance temperature sensor according to an embodiment of the present invention is shown.

[0018] Figure 5 A circuit diagram of a voltage signal analog circuit according to an embodiment of the present invention is shown.

[0019] Figure 6 A circuit diagram of a DC bias signal analog circuit according to an embodiment of the present invention is shown.

[0020] Figure 7 A circuit diagram of an operational amplifier adder circuit according to an embodiment of the present invention is shown.

[0021] Figure 8 A circuit diagram of a digital signal analog circuit according to an embodiment of the present invention is shown.

[0022] Figure 9 A circuit diagram of a digital signal measurement circuit according to an embodiment of the present invention is shown. Detailed Implementation

[0023] Please see Figure 1 A compressor factory test and debugging device according to an embodiment of the present invention includes a 4-20mA current signal simulation circuit 1, a 4-20mA current signal measurement circuit 2, a thermal resistance temperature sensor signal simulation circuit 3, a voltage signal simulation circuit 4, a DC bias signal simulation circuit 5, a digital signal simulation circuit 6, a digital signal measurement circuit 7, first to eighth electrical terminals, a display component 9, and a controller 10.

[0024] The 4-20mA current signal simulation circuit 1, the 4-20mA current signal measurement circuit 2, the voltage signal simulation circuit 4, and the DC bias signal simulation circuit 5 are connected one-to-one with the first electrical terminal 81, the second electrical terminal 82, the fifth electrical terminal 85, and the sixth electrical terminal 86, respectively. The RTD temperature sensor signal simulation circuit 3 is connected with the third electrical terminal 83 and the fourth electrical terminal 84, respectively. The digital signal simulation circuit 6 is connected with the seventh electrical terminal 87, and the digital signal measurement circuit 7 is connected with the eighth electrical terminal 88. The signal output terminals of the 4-20mA current signal simulation circuit 1, the 4-20mA current signal measurement circuit 2, the RTD temperature sensor signal simulation circuit 3, the voltage signal simulation circuit 4, the DC bias signal simulation circuit 5, the digital signal simulation circuit 6, and the digital signal measurement circuit 7 are connected with the signal input terminals of the controller 10, respectively.

[0025] The circuit comprises the following components: a 4-20mA current signal analog circuit 1 generates an analog 4-20mA current signal for input to the analog input module of the compressor control system; a digital signal analog circuit 6 generates an analog digital level signal for input to the digital input module of the compressor control system; a 4-20mA current signal measurement circuit 2 measures the 4-20mA current signal output by the compressor control system; a resistance temperature sensor signal analog circuit 3 generates an analog resistance temperature sensor signal; a voltage signal analog circuit 4 generates an analog DC voltage signal; a DC bias signal analog circuit 5 generates an analog DC bias signal; and a digital signal measurement circuit 7 measures the digital level signal output by the compressor control system. In this embodiment, the analog DC voltage signal is 0-10V, and the digital level signals are 0-24V.

[0026] The controller 10 is connected to the display unit 9. In this embodiment, the controller 10 is a PLC controller, optionally a Siemens S7-1200. The display unit 9 is a display screen, including but not limited to a non-touch display screen or a touch display screen.

[0027] In this embodiment, the first electrical terminal 81 to the eighth electrical terminal 88 are all push-button quick-connect electrical terminals. This connection method can greatly simplify the connection process between this embodiment and the compressor control system 100, reduce the connection time of cables and interfaces, reduce the complexity and workload of debugging, and reduce problems such as connection failures and data loss. In addition, push-button quick-connect terminals have good durability and reliability, which can ensure the stability and safety of the connection.

[0028] It should be noted that, Figures 2 to 9 For simplicity, electrical terminals are not shown; instead, the connection relationships between each circuit and the corresponding module of the compressor control system 100 are directly displayed. In actual operation, the connection between each circuit and the compressor control system is achieved through the connection of the corresponding electrical terminals to the corresponding interfaces of the compressor control system. In some specific embodiments, the compressor control system described above is a screw compressor control system, which mainly consists of a Siemens S7-1200 PLC controller and a Bentley 3500 card.

[0029] Please see Figure 2 The 4-20mA current signal analog circuit 1 includes a positive terminal L1, a negative terminal N1, a diode D1, a smart ammeter A1, a potentiometer RP1, and a protective resistor R1. The positive terminal L1 and the negative terminal N1 are connected to the first electrical terminal 81, which is used to connect to the AI ​​(analog signal input) module of the compressor control system during testing. The anode of diode D1 is connected to the positive terminal L1. The smart ammeter A1, potentiometer RP1, and protective resistor R1 are connected in series between the cathode of diode D1 and the negative terminal N1. The signal output terminal of the smart ammeter A1 is electrically connected to the signal input terminal of the controller 10.

[0030] Furthermore, the 4-20mA current signal analog circuit 1 includes a bidirectional TVS transistor T1 and a capacitor C1. The two ends of the bidirectional TVS transistor T1 are connected to the positive terminal L1 and the negative terminal N1, respectively. The capacitor C1 is connected in parallel with the series branch composed of potentiometer RP1 and protection resistor R1, which plays a filtering role.

[0031] Please see Figure 3 The 4-20mA current signal measurement circuit 2 includes a positive terminal L2, a negative terminal N2, a smart ammeter A2, and a protective resistor R2. The positive terminal L2 and the negative terminal N2 are connected to the second electrical terminal 82, which is used to connect to the AO (analog signal output) module of the compressor control system during testing. The smart ammeter A2 and the protective resistor R2 are connected in series between the positive terminal L2 and the negative terminal N2. The signal output terminal of the smart ammeter A2 is electrically connected to the signal input terminal of the controller 10.

[0032] Furthermore, the 4-20mA current signal measurement circuit 2 includes a bidirectional TVS transistor T2 and a capacitor C2. The two ends of the bidirectional TVS transistor T2 are connected to the positive terminal L2 and the negative terminal N2, respectively. The capacitor C2 is connected in parallel with the protection resistor R2 to serve as a filter.

[0033] During testing, the 4-20mA current signal simulation circuit 2 and the 4-20mA current signal measurement circuit 2 are connected to the AI ​​module terminal and AO module terminal of the compressor control system through the first electrical terminal 81 and the second electrical terminal 82, respectively. The corresponding fuse knife switch terminal in the compressor control system is then closed to form a circuit.

[0034] When testing PID control, the resistance value in the 4-20mA current signal simulation circuit 1 is adjusted by rotating the knob of potentiometer RP1 (in this embodiment, potentiometer RP1 is a rotary potentiometer). A suitable 4-20mA input current signal is given to the compressor control system. The AO module of the compressor control system will output a constant current source signal. The 4-20mA current signal simulation circuit 1 acts as a substitute for the process value in PID control. The intelligent ammeter A2 in the 4-20mA current signal measurement circuit 2 measures the periodic change and relative change trend of the constant current source signal.

[0035] During the step response test, the 4-20mA current signal simulation circuit 1 outputs a step signal (e.g., the current signal jumps from 12mA to 16mA), and the controller 10 records the change curve of the data collected by the smart ammeter A2. The debugging personnel calibrate the PID parameters of the compressor control system and whether the direct and reverse actions are accurate.

[0036] When testing the analog input channel of the compressor control system, the resistance value of potentiometer RP1 is adjusted to simulate 0% / 25% / 50% / 75% / 100% of the 4-20mA signal, and the display of the compressor control system and the intelligent ammeter A2 is observed to see if they are within the acceptable error range. If they are within the error range, the test is considered qualified.

[0037] Please see Figure 4The analog circuit 3 for the resistance temperature sensor signal includes a positive terminal L3, a negative terminal N3, a positive terminal L4, a negative terminal N4, a potentiometer RP2, a protective resistor R3, and a one-input-two-output signal isolation barrier G1. The positive terminal L3 and the negative terminal N3 are connected to the third electrical terminal 83, and the positive terminal L4 and the negative terminal N4 are connected to the fourth electrical terminal 84. The first terminal of the potentiometer RP2 is connected to the first and second input terminals of the one-input-two-output signal isolation barrier G1, respectively. The second terminal of the potentiometer RP2 is connected to the first terminal of the protective resistor R3, and the second terminal of the protective resistor R3 is connected to the third and fourth input terminals of the one-input-two-output signal isolation barrier G1, respectively. The first and second output terminals of the one-input two-output signal isolation barrier G1 are both connected to the first input terminal. The third and fourth output terminals of the one-input two-output signal isolation barrier G1 are both connected to the second input terminal. The fifth and sixth output terminals of the one-input two-output signal isolation barrier G1 are both connected to the third input terminal. The seventh and eighth output terminals of the one-input two-output signal isolation barrier G1 are both connected to the fourth input terminal. The first, third, fifth, and seventh output terminals are connected to the positive terminal L3, positive terminal L4, negative terminal N4, and negative terminal N3 respectively. The second, fourth, sixth, and eighth output terminals are connected to the signal input terminal of the controller 10.

[0038] In this embodiment, the resistance temperature sensor is a PT100 platinum resistance temperature sensor.

[0039] When testing the PT100 input channel of the compressor control system, the analog circuit 3 of the resistance temperature sensor signal is connected to the terminals of the PT100 module of the compressor control system through the third electrical terminal 83 and the fourth electrical terminal 84. By adjusting the resistance value of the rotary potentiometer RP2, the analog resistance temperature sensor signal is simulated at 0% / 25% / 50% / 75% / 100%. The commissioning personnel observe whether the measured value of the compressor control system and the given value displayed by the display component 9 are within the acceptable error range. If they are within the acceptable error range, the test is considered qualified.

[0040] Please see Figure 5 The voltage signal analog circuit 4 includes a positive terminal L5, a negative terminal N5, a DC voltage source V3, a smart voltmeter A3, a potentiometer RP3, and a voltage divider resistor R4. The positive terminal L5 and the negative terminal N5 are connected to the fifth electrical terminal 85. The potentiometer RP3 and the voltage divider resistor R4 are connected in series between the positive and negative terminals of the DC voltage source V3, with the two ends of the voltage divider resistor R4 connected to the positive terminal L5 and the negative terminal N5, respectively. The smart voltmeter A3 is connected in parallel with the voltage divider resistor R4, and the signal output terminal of the smart voltmeter A3 is connected to the signal input terminal of the controller 10.

[0041] Furthermore, the voltage signal analog circuit 4 includes a capacitor C3, which is connected in parallel with the voltage divider resistor R4 to serve as a filter.

[0042] When testing the shaft displacement circuit of the compressor control system, the voltage signal simulation circuit 4 is connected to the terminal of the shaft displacement module of the compressor control system through the fifth electrical terminal 85. By adjusting the resistance value of the rotary potentiometer RP3, the voltage level signal on the voltage divider resistor R4 in the circuit is adjusted to simulate the shaft displacement signal of 0% / 25% / 50% / 75% / 100%. The display of the compressor control system and the intelligent voltmeter A3 is observed to see if they are within the acceptable error range. If they are within the error range, the test is qualified.

[0043] Please see Figure 6 The DC bias signal analog circuit 5 includes a positive terminal L6, a negative terminal N6, a smart voltmeter A4, a microcontroller U2, a reference DC voltage source 51, a D / A converter 52, an operational amplifier adder circuit 53, a storage element 54, and a human-machine interface component 55. The two ends of the smart voltmeter A4 are connected to the positive terminal L6 and the negative terminal N6, respectively. The signal output terminal of the smart voltmeter A4 is electrically connected to the signal input terminal of the controller 10. The positive terminal L6 and the negative terminal N6 are connected to the sixth electrical terminal 86.

[0044] The microcontroller U2 is connected to the data input terminal of the D / A converter 52, the storage element 54, and the human-machine interface component 55, respectively. The signal input terminal of the operational amplifier adder circuit 53 is connected to the analog voltage output terminal of the D / A converter 52 and the output terminal of the reference DC voltage source 51, respectively. The output terminal of the operational amplifier adder circuit 53 is connected to the positive terminal L6 and the negative terminal N6, respectively.

[0045] Please see Figure 7 The operational amplifier adder circuit 53 includes an operational amplifier U1, resistors R15, R16, R17, and R18. One end of resistor R15 is connected to the output of the reference DC voltage source 51, one end of resistor R16 is connected to the analog voltage output of the D / A converter 52, and the common junction of the other ends of resistor R15 and R16 is connected to the non-inverting input of operational amplifier U1. One end of resistor R17 is connected to the output of operational amplifier U1, the other end of resistor R17 is connected to one end of resistor R18, and the other end of resistor R18 is connected to the negative terminal N6. The output of operational amplifier U1 is connected to the positive terminal L6, and the inverting input of operational amplifier U1 is connected to the common junction of the other ends of resistor R17 and R18.

[0046] Microcontroller U2 inputs waveform data to D / A converter 52. D / A converter 52 outputs a corresponding sinusoidal voltage signal based on the input waveform data. Operational amplifier adder circuit 53 superimposes the sinusoidal voltage signal output by D / A converter 52 with the DC voltage signal output by reference DC voltage source 51 and outputs the result. The signal formed by superimposing the sinusoidal voltage signal and the DC voltage signal simulates the shaft vibration signal of the compressor. In this embodiment, the reference DC voltage source 51 outputs a DC voltage of 2.5V.

[0047] The waveform data described above is stored in storage element 54, and the microcontroller U2 can read the waveform data from storage element 54. The waveform data includes information such as the amplitude and frequency of the sine wave. By storing multiple sets of different waveform data for the microcontroller U2 to call, the frequency and / or amplitude of the sine wave voltage signal output by the D / A converter 52 can also be changed, thereby simulating different forms of shaft vibration signals of screw compressors.

[0048] In this embodiment, the microcontroller U2 uses the AT89C55WD chip, and the human-machine interaction component 53 uses a touch screen.

[0049] When testing the shaft vibration signal, the frequency and amplitude of the sinusoidal voltage signal output by the D / A converter 52 are changed through the interactive human-machine interface 55 to simulate the shaft vibration eddy current signal. The measured value of the compressor control system and the given value displayed by the intelligent voltmeter A4 are observed to see if they are within the acceptable error range. If they are within the error range, the test is considered qualified.

[0050] Please see Figure 8 and Figure 9 The digital signal analog circuit 6 includes a positive terminal L7, a negative terminal N7, a DC voltage source V5, a digital input switch K1, and an indicator light Q1. The positive terminal L7 and the negative terminal N7 are connected to the seventh electrical terminal 87. The digital input switch K1 and the indicator light Q1 are connected in series between the positive terminal of the DC voltage source V5 and the positive terminal L7, and the negative terminal of the DC voltage source V5 is connected to the negative terminal N7.

[0051] Furthermore, the digital signal analog circuit 6 includes a capacitor C5. One end of the capacitor C5 is connected to the common contact of the digital input switch K1 and the indicator light Q1, and the other end of the capacitor C5 is connected to the negative terminal N7. The capacitor C5 serves as a filter.

[0052] The digital signal measurement circuit 7 includes a positive terminal L8, a negative terminal N8, and an indicator light Q2. The positive terminal L8 and the negative terminal N8 are respectively connected to the eighth electrical terminal 88; the two ends of the indicator light Q2 are respectively connected to the positive terminal L8 and the negative terminal N8.

[0053] Furthermore, the digital signal measurement circuit 7 includes a capacitor C6. One end of the capacitor C6 is connected to the common contact point of the positive terminal L8 and the indicator light Q2, and the other end of the capacitor C6 is connected to the negative terminal N8. The capacitor C6 serves as a filter.

[0054] The controller 10 is connected to the common contact O, negative terminal N7, positive terminal L8, and negative terminal N8 of the digital input switch K1 and the indicator Q1, respectively, to collect the voltage drop between the common contact O and the negative terminal N7, as well as the voltage drop between the positive terminal L8 and the negative terminal N8.

[0055] When testing the digital input channel of the compressor control system, connect the digital signal analog circuit 6 to the digital input terminal of the digital module of the compressor control system via the seventh electrical terminal 87. Press the digital input switch K1 and compare the display of indicator light Q1 with the corresponding indicator light on the compressor control system. If they match, the test is qualified. When testing the digital output channel of the compressor control system, connect the digital signal measurement circuit to the digital output terminal of the digital module of the compressor control system via the eighth electrical terminal 88. In accordance with the requirements of the project logic drawing, based on the input of the 4-20mA current signal analog circuit 1 / voltage signal analog circuit 4 / digital signal analog circuit 6, observe whether the digital signal output by the digital signal measurement circuit 7 matches the logic relationship on the drawing. If they match, the test is qualified.

[0056] In this embodiment, the smart ammeters A1, A2, A3, and A4, the knobs of the rotary potentiometers RP1 to RP3, the digital input switch K1, the human-machine interface component 55, and the display component 9 are all arranged on the control panel of the compressor's factory test and debugging device to facilitate operation by the debugging personnel. The controller 10 collects various debugging operation data, processes and saves the collected signals, and transmits them to the display component 9, which displays the operation data and debugging results. The debugging personnel can perform debugging and adjustments based on the displayed results to confirm the performance and accuracy of the compressor system. In some specific embodiments, the content displayed on the smart ammeters A1, A2, A3, and A4 is also displayed on the display component 9.

[0057] Compared with the prior art, the present invention has the following advantages and features:

[0058] 1. By designing various electronic circuits to obtain the required signal types, it is easy to quickly deploy and apply them to different needs. In addition, the added intelligent ammeter and intelligent voltmeter can detect the amplitude and stability of the signal, improving the flexibility and adaptability of the experimental device.

[0059] 2. This invention solves the complexity and fault problems associated with numerous cable and interface connections. By using electronic circuits instead of signal generators, it avoids the use of test leads, probes, and alligator clips, thus reducing the failure rate. The use of push-button quick-connect electrical terminals simplifies the connection method, reduces cable and interface failure points, lowers the complexity and workload of debugging, and simultaneously reduces connection failures and improves work efficiency.

[0060] 3. By replacing analog signal generators with integrated electronic circuits, more signal sources can be integrated in a small space, greatly reducing the space required for experimental equipment, increasing the number of visual instruments, and simulating signals under actual working conditions more effectively and intuitively, thereby improving the debugging effect and accuracy.

[0061] This invention effectively improves the debugging efficiency and completeness of the factory test of the compressor control system, reduces the complexity and workload of debugging, and improves the debugging effect and accuracy, thereby meeting the special needs of the test area of ​​the compressor manufacturing workshop and reducing the on-site debugging cycle.

Claims

1. A compressor factory testing and debugging device, characterized in that, It includes a 4-20mA current signal simulation circuit, a 4-20mA current signal measurement circuit, a resistance temperature sensor signal simulation circuit, a voltage signal simulation circuit, a DC bias signal simulation circuit, first to sixth electrical terminals, a display component, and a controller; The 4-20mA current signal simulation circuit, the 4-20mA current signal measurement circuit, the voltage signal simulation circuit, and the DC bias signal simulation circuit are connected to the first electrical terminal, the second electrical terminal, the fifth electrical terminal, and the sixth electrical terminal, respectively, in a one-to-one correspondence. The RTD temperature sensor signal simulation circuit is connected to the third electrical terminal and the fourth electrical terminal, respectively. The signal output terminals of the 4-20mA current signal simulation circuit, the 4-20mA current signal measurement circuit, the RTD temperature sensor signal simulation circuit, the voltage signal simulation circuit, and the DC bias signal simulation circuit are connected to the signal input terminals of the controller, respectively. The controller is connected to the display component.

2. The compressor factory test and debugging device according to claim 1, characterized in that, The 4-20mA current signal analog circuit includes a positive terminal L1, a negative terminal N1, a diode D1, a smart ammeter A1, a potentiometer RP1, and a protection resistor R1. The positive terminal L1 and the negative terminal N1 are connected to the first electrical terminal; The anode of diode D1 is connected to the positive terminal L1, and the smart ammeter A1, potentiometer RP1 and protection resistor R1 are connected in series between the cathode of diode D1 and the negative terminal N1. The signal output terminal of the intelligent ammeter A1 is electrically connected to the signal input terminal of the controller.

3. The compressor factory test and commissioning device of claim 2, wherein, The intelligent ammeter A1, potentiometer RP1, and protection resistor R1 are connected in series between the cathode of diode D1 and the negative terminal N1. The 4-20mA current signal analog circuit includes a bidirectional TVS transistor T1 and a capacitor C1. The two ends of the bidirectional TVS transistor T1 are connected to the positive terminal L1 and the negative terminal N1, respectively. The capacitor C1 is connected in parallel with the series branch consisting of potentiometer RP1 and protection resistor R1.

4. The compressor factory test and commissioning device of claim 1, wherein, The 4-20mA current signal measurement circuit includes a positive terminal L2, a negative terminal N2, a smart ammeter A2, and a protective resistor R2; The positive terminal L2 and the negative terminal N2 are connected to the second electrical terminal; The intelligent ammeter A2 and the protective resistor R2 are connected in series between the positive terminal L2 and the negative terminal N2. The signal output terminal of the intelligent ammeter A2 is electrically connected to the signal input terminal of the controller.

5. The compressor factory test and commissioning device of claim 4, wherein, The 4-20mA current signal measurement circuit includes a bidirectional TVS transistor T2 and a capacitor C2. The two ends of the bidirectional TVS transistor T2 are connected to the positive terminal L2 and the negative terminal N2, respectively. The capacitor C2 is connected in parallel with the protection resistor R2.

6. The compressor factory test and commissioning device of claim 1, wherein, The signal simulation circuit of the resistance temperature sensor includes a positive terminal L3, a negative terminal N3, a positive terminal L4, a negative terminal N4, a potentiometer RP2, a protective resistor R3, and a one-input, two-output signal isolation barrier G1. The positive terminal L3 and the negative terminal N3 are connected to the third electrical terminal, and the positive terminal L4 and the negative terminal N4 are connected to the fourth electrical terminal. The first end of potentiometer RP2 is connected to the first and second input terminals of the one-input-two-output signal isolation barrier G1, respectively. The second end of potentiometer RP2 is connected to the first end of protection resistor R3, and the second end of protection resistor R3 is connected to the third and fourth input terminals of the one-input-two-output signal isolation barrier G1, respectively. The first and second output terminals of the one-input-two-output signal isolation barrier G1 are both connected to the first input terminal. The third and fourth output terminals of the one-input-two-output signal isolation barrier G1 are both connected to the second input terminal. The fifth and sixth output terminals of the one-input-two-output signal isolation barrier G1 are both connected to the third input terminal. The seventh and eighth output terminals of the one-input-two-output signal isolation barrier G1 are both connected to the fourth input terminal. The first, third, fifth, and seventh output terminals are connected to the positive terminal L3, positive terminal L4, negative terminal N4, and negative terminal N3 respectively. The second, fourth, sixth, and eighth output terminals are connected to the signal input terminal of the controller.

7. The compressor factory test and commissioning device of claim 6, wherein, The aforementioned resistance temperature sensor is a PT100 platinum resistance temperature sensor.

8. The compressor factory test and commissioning device of claim 1, wherein, The voltage signal analog circuit includes a positive terminal L5, a negative terminal N5, a DC voltage source V3, a smart voltmeter A3, a potentiometer RP3, and a voltage divider resistor R4. The positive terminal L5 and the negative terminal N5 are connected to the fifth electrical terminal; Potentiometer RP3 and voltage divider resistor R4 are connected in series between the positive and negative terminals of DC voltage source V3. The two ends of voltage divider resistor R4 are connected to the positive terminal L5 and the negative terminal N5, respectively. The intelligent voltmeter A3 is connected in parallel with the voltage divider resistor R4, and the signal output terminal of the intelligent voltmeter A3 is connected to the signal input terminal of the controller.

9. The compressor factory test and debugging device according to claim 8, characterized in that, The voltage signal analog circuit includes a capacitor C3, which is connected in parallel with a voltage divider resistor R4.

10. The compressor factory test and debugging device according to claim 1, characterized in that, The DC bias signal analog circuit includes a positive terminal L6, a negative terminal N6, a smart voltmeter A4, a microcontroller U2, a reference DC voltage source, a D / A converter, an operational amplifier adder circuit, storage elements, and a human-machine interface component. The two ends of the intelligent voltmeter A4 are connected to the positive terminal L6 and the negative terminal N6 respectively. The signal output terminal of the intelligent voltmeter A4 is electrically connected to the signal input terminal of the controller. The positive terminal L6 and the negative terminal N6 are connected to the sixth electrical terminal. The microcontroller U2 is connected to the data input terminal of the D / A converter, the storage element, and the human-machine interface component, respectively; the signal input terminal of the operational amplifier adder circuit is connected to the analog voltage output terminal of the D / A converter and the output terminal of the reference DC voltage source, respectively; and the output terminal of the operational amplifier adder circuit is connected to the positive terminal L6 and the negative terminal N6, respectively.

11. The compressor factory test and debugging device according to claim 10, characterized in that, The operational amplifier adder circuit includes an operational amplifier U1, resistors R15, R16, R17, and R18; One end of resistor R15 is connected to the output terminal of the reference DC voltage source, one end of resistor R16 is connected to the analog voltage output terminal of the D / A converter, and the common junction of the other ends of resistor R15 and the other ends of resistor R16 is connected to the non-inverting input terminal of operational amplifier U1. One end of resistor R17 is connected to the output terminal of operational amplifier U1, the other end of resistor R17 is connected to one end of resistor R18, and the other end of resistor R18 is connected to the negative terminal N6. The output terminal of operational amplifier U1 is connected to the positive terminal L6, and the inverting input terminal of operational amplifier U1 is connected to the common junction of the other end of resistor R17 and one end of resistor R18.

12. The compressor factory test and debugging device according to claim 1, characterized in that, The compressor factory test and debugging device includes a digital signal analog circuit, a digital signal measurement circuit, a seventh electrical terminal, and an eighth electrical terminal; the digital signal analog circuit is connected to the seventh electrical terminal, the digital signal measurement circuit is connected to the eighth electrical terminal, and the signal output terminals of the digital signal analog circuit and the digital signal measurement circuit are respectively connected to the signal input terminal of the controller.

13. The compressor factory test and debugging device according to claim 12, characterized in that, The digital signal analog circuit includes a positive terminal L7, a negative terminal N7, a DC voltage source V5, a digital input switch K1, and an indicator light Q1; the positive terminal L7 and the negative terminal N7 are connected to the seventh electrical terminal; the digital input switch K1 and the indicator light Q1 are connected in series between the positive terminal of the DC voltage source V5 and the positive terminal L7, and the negative terminal of the DC voltage source V5 is connected to the negative terminal N7. The digital signal measurement circuit includes a positive terminal L8, a negative terminal N8, and an indicator light Q2; the positive terminal L8 and the negative terminal N8 are respectively connected to the eighth electrical terminal; the two ends of the indicator light Q2 are respectively connected to the positive terminal L8 and the negative terminal N8. The controller is connected to the common contact O, negative terminal N7, positive terminal L8, and negative terminal N8 of the digital input switch K1 and the indicator Q1, respectively, to collect the voltage drop between the common contact O and the negative terminal N7, as well as the voltage drop between the positive terminal L8 and the negative terminal N8.

14. The compressor factory test and debugging device according to claim 13, characterized in that, The digital signal analog circuit includes capacitor C5, and the digital signal measurement circuit includes capacitor C6. One end of capacitor C5 is connected to the common contact of digital input switch K1 and indicator light Q1, and the other end of capacitor C5 is connected to the negative terminal N7; one end of capacitor C6 is connected to the common contact of positive terminal L8 and indicator light Q2, and the other end of capacitor C6 is connected to the negative terminal N8.

15. The compressor factory test and debugging device according to claim 13, characterized in that, All electrical terminals from the first to the eighth are push-button quick-connect electrical terminals.

16. The compressor factory test and debugging device according to claim 1, characterized in that, The controller is a PLC controller.

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