Comprehensive test platform for maintenance of frequency converter

Abstract

The utility model discloses a frequency converter maintenance comprehensive test platform which comprises a counter, a test platform and a maintenance platform, and the test platform and the maintenance platform are both installed on the counter. The counter comprises an upper counter, a middle counter and a lower counter, the upper counter and the lower counter are welded to the top and the bottom of the middle counter respectively, the test platform is installed on the upper counter, and the maintenance platform is installed on the middle counter. The comprehensive test platform for frequency converter maintenance can adapt to frequency converters of various brands and models, and overcomes the problems of differences in appearance, interfaces and the like and high voltage and large current. Multiple functions and reasonable design are integrated, rapid maintenance testing is achieved, and efficiency is improved. The device has the functions of allowing load short circuit, intuitively testing principle, backlight display, voice prompt, multiple safety protection, no-load power transmission and the like. And an isolation maintenance power supply is provided to facilitate independent maintenance operation of the circuit board. The large capacitor discharge function improves the maintenance safety and convenience, provides a good basis for the maintenance test of the frequency converter, and guarantees the turnover of spare parts.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of frequency converter maintenance, especially relates to a frequency converter maintenance comprehensive test platform. BACKGROUND

[0002] In many fields of modern industry and life, such as elevator speed regulation, water pump constant pressure water supply, ventilation pressure regulation, air conditioning temperature control and fire fighting, frequency converters play a vital role. With the rapid expansion of Shenzhen subway network, subway lines and vehicle types are increasing, and the application places of frequency converters are increasing, and the installed capacity is huge, more than 10,000 units. These frequency converters cover nearly ten brands such as Mitsubishi, Siemens, AB, ABB, Danfoss, Yaskawa, and dozens of models such as MM440-A110, FC-300, MM440-A132, 20AC022A0AYNANC0, VLT5000, FR-A540, FR-A241E, V1000.

[0003] Different brands and models of frequency converters have significant differences in appearance, interface, instruction and power, and their work involves high voltage (such as AC380 volts) and large current, which brings great challenges to maintenance and testing. Although rich experience has been accumulated in the maintenance of other electronic components of the system, due to the limitations of frequency converter maintenance site and test conditions, the maintenance of frequency converters has not achieved the desired effect. For example, there is a lack of professional test equipment, and suitable tools cannot be directly purchased on the market to meet the maintenance and testing needs of different models of frequency converters, resulting in low maintenance and testing efficiency and increasing maintenance difficulties. Therefore, in order to reduce operating costs and realize equipment reuse, it is extremely urgent and important to develop a platform specially for frequency converter maintenance and testing. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of frequency converter maintenance comprehensive test platform, to solve the problems in the background art. To achieve the purpose, the utility model adopts the technical scheme that:

[0005] A kind of frequency converter maintenance comprehensive test platform, including counter, test platform and maintenance platform, test platform and maintenance platform are installed on counter;Counter includes upper counter, middle counter and lower counter, the top and bottom of middle counter are welded with upper counter and lower counter respectively, test platform is installed on upper counter, and maintenance platform is installed on middle counter.

[0006] Preferably, the test platform comprises a leakage switch, a first circuit breaker, a first contactor, a three-phase current, a first isolation transformer, a voice broadcast, a second contactor, a status indicator, a three-phase voltage, a power regulator, a frequency converter, a signal indicator, a power quality detector and a motor, one end of the first circuit breaker is electrically connected with the leakage switch, the other end of the first circuit breaker is electrically connected with the first contactor, the other end of the first contactor is electrically connected with the three-phase current, the other end of the three-phase current is electrically connected with the first isolation transformer, the other end of the first isolation transformer is electrically connected with the second contactor, the other end of the second contactor is connected with the status indicator, the other end of the status indicator is connected with the frequency converter, the three-phase voltage is electrically connected between the status indicator and the frequency converter, the power regulator, the signal indicator, the power quality detector and the motor are electrically connected with the frequency converter.

[0007] Preferably, the control voltage of the power regulator is 0-110V.

[0008] Preferably, the current of the signal indicator is 4-20mA or 0-10V.

[0009] Preferably, the maintenance platform comprises a second circuit breaker, a second isolation transformer, a first short circuit indicator, a first button, a socket, a rectifier bridge, a residual voltage tester, a second button, a maintenance device, a discharge terminal, a second short circuit indicator, a PLC and a touch screen all-in-one machine, one end of the circuit breaker is electrically connected with the isolation transformer, the other end of the second isolation transformer is electrically connected with the first button and the second button, one end of the first button is electrically connected with the rectifier bridge and the socket, the second button is electrically connected with the maintenance device, the first short circuit indicator is arranged at the live wire connected with the first button and the second button of the second isolation transformer, the tail of the residual voltage tester is electrically connected with the discharge terminal, the second short circuit indicator is arranged between the residual voltage tester and the discharge terminal, the PLC is electrically connected with the touch screen all-in-one machine through RS485, and the PLC and the touch screen all-in-one machine are both connected with zero live wire.

[0010] Preferably, the voltage of the socket is 0-220V.

[0011] Preferably, one side of the counter is further provided with a maintenance vehicle.

[0012] Preferably, the frequency converter maintenance comprehensive test platform is further provided with a short circuit protection circuit cooperating with the maintenance platform and the test platform, a first maintenance auxiliary circuit, a second maintenance auxiliary circuit and a voice broadcast function, the voice broadcast function uses sound to remind the operator when someone walks into the test area, the line overflows, the platform fails, the function is executed and the like, so that the use of the platform is more humanized and safe. The circuit adopts a JQ8900 voice module and various function trigger signals, when the MCU collects the trigger signal from the PLC or the hard-wired circuit, the corresponding number voice information in the voice module is called, and the corresponding voice is issued through the power amplifier circuit and the loudspeaker to remind.

[0013] Preferably, the short-circuit protection circuit is limited by three 3000W 100 ohm resistors, and the load condition of the main circuit is judged by self-developed PCB voltage taking, when normal current passes, the yellow, green and red lights of U, V and W phases are always on respectively, when overcurrent or short-circuit current passes, the indicator light flashes quickly, and an alarm contact and sound are output, when the overcurrent is not handled for more than 6 seconds, the PLC will send a command to close the test function, and when the normal current passes through the current limiting resistor for 12 seconds, the PLC will output a command to short the current limiting resistor, and the main circuit outputs normal 380V AC power supply.

[0014] Preferably, the first maintenance auxiliary circuit generates a high-frequency square wave pulse through a NE555 bistable circuit, the high-frequency square wave pulse is input from the U phase of the frequency converter, is returned to the V phase and the W phase through the internal circuit, is amplified through the circuit and is utilized, a relay output is controlled, and the circuit can effectively prevent misfeeding when the wiring head is suspended.

[0015] Preferably, the second maintenance auxiliary circuit is isolated from the AC 220V power supply, the DC 311V power supply, the 0-120V adjustable DC power supply and the large-capacitance discharge circuit, and can directly operate on the test desktop.

[0016] The frequency converter maintenance comprehensive test platform can adapt to frequency converters of various brands and models, and overcomes the great differences in appearance, interface, instruction and power of frequency converters of different brands and models and the maintenance and test difficulties caused by high voltage and large current.

[0017] The test platform has various functions such as short-circuit protection and alarm, soft and hard key redundant control frequency converter operation mode, stepless speed regulation signal output, frequency converter output power supply monitoring, load detection control and the like. For example, the short-circuit protection circuit judges the load condition of the main circuit through the current limiting resistor and the self-developed PCB voltage taking, can effectively prevent the large current short-circuit risk caused by frequency converter failure, and guarantees the safety of the test process and the stability of the equipment. At the same time, the platform allows load short-circuit, can directly test the principle, adopts a backlight display mode, has a voice information reminding function, is further provided with multiple safety protections, cannot feed power without load, and further improves the safety and convenience of the test.

[0018] The maintenance platform provides functions such as isolated AC 220V power supply, DC 311V power supply, 0-120V adjustable DC power supply, large-capacitance discharge and the like, is convenient for independent maintenance of part of the circuit board, can directly perform relevant operations on the test desktop, and further improves the convenience and flexibility of the maintenance.

[0019] This platform has bridged the gap in the company's independent inverter maintenance business, providing a sound foundation for inverter power transmission, testing, and repair operations, ensuring spare parts turnover, and facilitating the company's production operations and equipment maintenance management. The platform's comprehensive functionality significantly supports inverter maintenance operations, aligning with national energy-saving, low-carbon, and green goals, and addressing the growing demand for inverters and inverter equipment, thus demonstrating its significant social impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An overall schematic diagram provided for an embodiment of the present utility model;

[0021] Figure 2 A schematic diagram of the structure of the detection platform provided in an embodiment of the present utility model;

[0022] Figure 3 A schematic diagram of the maintenance platform structure provided by an embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the structure of a maintenance vehicle provided by an embodiment of the utility model;

[0024] Figure 5 This is a schematic diagram of the principle diagram of the inverter maintenance and testing platform according to an embodiment of the utility model;

[0025] Figure 6 This is a schematic diagram of a voltage-taking circuit according to an embodiment of the present utility model;

[0026] Figure 7 This is a schematic diagram of the indication and alarm display circuit of an embodiment of the utility model;

[0027] Figure 8 This is a schematic diagram of a circuit design board according to an embodiment of the present utility model;

[0028] Figure 9 This is a schematic diagram of the principle of the first maintenance auxiliary circuit of an embodiment of the present utility model;

[0029] Figure 10 This is a schematic diagram of a first maintenance display circuit board according to an embodiment of the present utility model;

[0030] Figure 11 This is a schematic diagram of a second maintenance auxiliary circuit according to an embodiment of the present utility model;

[0031] Figure 12 A schematic diagram of a voice file according to an embodiment of the present utility model;

[0032] Figure 13 This is a schematic diagram of a voice playback triggering method according to an embodiment of the present invention;

[0033] Figure 14The code playing trigger mode schematic view of the embodiment of the utility model.

[0034] In the figure, various reference signs:

[0035] 1, counter; 11, upper counter; 12, middle counter; 13, lower counter; 2, test platform; 201, leakage switch; 202, first circuit breaker; 203, first contactor; 204, three-phase current; 205, first isolation transformer; 206, voice broadcast; 207, second contactor; 208, state indicating lamp; 209, three-phase voltage transformer; 210, power regulator; 211, frequency converter; 212, annunciator; 213, power quality detector; 214, motor; 3, maintenance platform; 301, second circuit breaker; 302, second isolation transformer; 303, first short-circuit indicating lamp; 304, first button; 305, socket; 306, rectifier bridge; 307, residual voltage tester; 308, second button; 309, maintainer; 310, discharge terminal; 311, second short-circuit indicating lamp; 312, PLC; 313, touch screen all-in-one machine; 4, maintenance vehicle. DETAILED DESCRIPTION

[0036] In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0037] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. Conversely, when an element is referred to as being "directly on" another element, there is no intervening element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation. The terms "upper end", "lower end", "left side", "right side", "front end", "rear end" and similar expressions used herein are with reference to the positional relationship of the drawings.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing the specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0039] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0040] like Figures 1-4 As shown, an embodiment of the utility model provides a comprehensive test platform 2 for inverter maintenance, including a counter 1, a test platform 2 and a maintenance platform 33, and the test platform 2 and the maintenance platform 33 are both installed on the counter 1; the counter 1 includes an upper counter 11, a middle counter 12 and a lower counter 13, and the top and bottom of the middle counter 12 are respectively welded with the upper counter 11 and the lower counter 13, the test platform 2 is installed on the upper counter 11, and the maintenance platform 33 is installed on the middle counter 12.

[0041] In the embodiment, the test platform 2 includes a leakage switch 201, a first circuit breaker 202, a first contactor 203, a three-phase current 204, a first isolation transformer 205, a voice broadcast 206, a second contactor 207, a status indicator 208, a three-phase voltage 209, a power regulator 210, a frequency converter 211, an annunciator 212, a power quality detector 213 and a motor 214. One end of the first circuit breaker 202 is electrically connected to the leakage switch 201, and the other end of the first circuit breaker 202 is electrically connected to the first contactor 203. The first contactor 203 The other end of the three-phase current transformer 204 is electrically connected to the first isolation transformer 205, the other end of the first isolation transformer 205 is electrically connected to the second contactor 207, the other end of the second contactor 207 is connected to the status indicator light 208, the other end of the status indicator light 208 is connected to the frequency converter 211, a three-phase voltage transformer 209 is electrically connected between the status indicator light 208 and the frequency converter 211, and the frequency converter 211 is electrically connected to a power regulator 210, an annunciator 212, a power quality detector 213 and a motor 214.

[0042] In an embodiment, the control voltage of the power regulator 210 is 0-110V.

[0043] In an embodiment, the current of the signaler 212 is 4-20 mA or 0-10 V.

[0044] In the embodiment, the maintenance platform 3 comprises a second circuit breaker 301, a second isolation transformer 302, a first short circuit indicator 303, a first button 304, a socket 305, a rectifier bridge 306, a residual voltage tester 307, a second button 308, a maintenance device 309, a discharge terminal 310, a second short circuit indicator 311, a PLC 312 and a touch screen all-in-one machine 313, one end of the second circuit breaker 301 is electrically connected with the isolation transformer, the other end of the second isolation transformer 302 is electrically connected with the first button 304 and the second button 308, one end of the first button 304 is electrically connected with the rectifier bridge 306 and the socket 305, the second button 308 is electrically connected with the maintenance device 309, the first short circuit indicator 303 is arranged at a live wire connected with the first button 304 and the second button 308 of the second isolation transformer 302, the tail of the residual voltage tester 307 is electrically connected with the discharge terminal 310, the second short circuit indicator 311 is arranged between the residual voltage tester 307 and the discharge terminal 310, the PLC 312 is electrically connected with the touch screen all-in-one machine 313 through RS485, and the PLC 312 and the touch screen all-in-one machine 313 are both connected with zero live wires.

[0045] In the embodiment, the voltage of the socket 305 is 0-220V.

[0046] Figure 5 In order to facilitate the operation of the frequency converter, the test platform is designed to combine hard control and soft control, the hard control mainly includes directly outputting signals of buttons and potentiometers and the like for control, the soft control is to use the touch screen all-in-one machine of the platform panel to combine configuration software, pass through interface virtual buttons, potentiometers and the like, and then use the PLC to complete various function controls of the test platform, the two control modes are redundant and coexist, and various function controls of the frequency converter are realized, mainly including forward rotation, reverse rotation, speed regulation, stop and the like. The circuit part fully considers operation safety and humanized operation, the platform has functions of anti-electric shock, anti-short circuit, intuitive display of circuit diagram and the like, and various conditions of the frequency converter can be conveniently judged through the display screen, the indicator light and the load and the like.

[0047] Figures 6-8 In order to prevent the risk of large current short circuit caused by frequency conversion failure, the test platform is provided with an anti-short circuit protection circuit, mainly through three 3000W 100-ohm resistors for current limiting, and through self-developed PCB voltage taking for judging the load condition of the main circuit. When the normal current passes, the U, V and W phases are respectively displayed by the yellow, green and red indicator lights, when the overcurrent or short circuit current passes, the indicator light will quickly flash, and an alarm contact and sound are output. When the overcurrent is not handled for more than 6 seconds, the PLC will send an instruction to close the test function. When the current limiting resistor flows the normal current for 12 seconds, the PLC will output an instruction to short the current limiting resistor, and the main circuit outputs the normal 380V alternating current power supply.

[0048] Figures 9-10 As the first maintenance auxiliary circuit diagram, in order to test the safety of the operation, the test platform is additionally provided with an anti-power transmission operation switch when the frequency converter wiring is installed, and is also designed to have an output main power non-wiring pressing test starting button invalid and voice reminding function, the principle of which is to generate a high-frequency square wave pulse through a NE555 bistable circuit, from the frequency converter U-phase input, utilize the internal circuit to return to V-phase and W-phase, and pass through the circuit to amplify the signal and utilize it, control the relay output, and the circuit can effectively prevent the misdelivery of power when the wiring head is suspended.

[0049] Figure 11 As the second maintenance auxiliary circuit diagram, in order to facilitate the independent maintenance operation of part of the circuit board, the test platform also integrates an auxiliary maintenance function of a single circuit board, mainly including an isolation AC220V power supply, a DC311V power supply, a 0-120V adjustable DC power supply, a large-capacitance discharge circuit and the like, which can directly operate on the desktop of the test.

[0050] Figures 12-14 As the voice broadcast function diagram, the test platform is also designed to have a voice broadcast function, which uses sound to remind the operator when someone walks into the test area, the line overflows, the platform fails, the function is executed and the like, so as to make the use of the platform more humanized and safe. The circuit adopts a JQ8900 voice module and various function trigger signals, when the MCU collects the trigger signal from the PLC or the hard-wired circuit, the corresponding number voice information in the voice module is called, and the corresponding voice is issued through the power amplifier circuit and the loudspeaker to remind.

[0051] The above embodiments are only used for describing the utility model, and not for limiting the utility model, and the ordinary skilled in the related art can make various changes and modifications without departing from the spirit and scope of the utility model, therefore all equivalent technical solutions also belong to the scope of the utility model, and the patent protection scope of the utility model should be limited by the claims.

Claims

1. A variable frequency drive serviceability integrated test platform, characterized by: The application relates to a test and maintenance platform for a frequency converter, which comprises a counter, a test platform and a maintenance platform, wherein the test platform and the maintenance platform are installed on the counter; the counter comprises an upper counter, a middle counter and a lower counter, the top and bottom of the middle counter are welded with the upper counter and the lower counter respectively, the test platform is installed on the upper counter, and the maintenance platform is installed on the middle counter.

2. The maintenance test platform for frequency converter according to claim 1, characterized in that: The test platform comprises a leakage switch, a first circuit breaker, a first contactor, a three-phase current, a first isolation transformer, a voice broadcast, a second contactor, a state indicator lamp, a three-phase voltage, a power regulator, a frequency converter, a signal indicator, a power quality detector and a motor, one end of the first circuit breaker is electrically connected with the leakage switch, the other end of the first circuit breaker is electrically connected with the first contactor, the other end of the first contactor is electrically connected with the three-phase current, the other end of the three-phase current is electrically connected with the first isolation transformer, the other end of the first isolation transformer is electrically connected with the second contactor, the other end of the second contactor is connected with the state indicator lamp, the other end of the state indicator lamp is connected with the frequency converter, the three-phase voltage is electrically connected between the state indicator lamp and the frequency converter, and the power regulator, the signal indicator, the power quality detector and the motor are electrically connected to the frequency converter.

3. The maintenance test platform for frequency converter according to claim 1, characterized in that: The maintenance platform comprises a second circuit breaker, a second isolation transformer, a first short-circuit indicator lamp, a first button, a socket, a rectifier bridge, a residual voltage tester, a second button, a maintenance device, a discharge terminal, a second short-circuit indicator lamp, a PLC and a touch screen all-in-one machine, one end of the second circuit breaker is electrically connected with the isolation transformer, the other end of the second isolation transformer is electrically connected with the first button and the second button, one end of the first button is electrically connected with the rectifier bridge and the socket, the second button is electrically connected with the maintenance device, the first short-circuit indicator lamp is arranged at a live wire connected with the first button and the second button of the second isolation transformer, the tail of the residual voltage tester is electrically connected with the discharge terminal, the second short-circuit indicator lamp is arranged between the residual voltage tester and the discharge terminal, the PLC is electrically connected with the touch screen all-in-one machine through RS485, and the PLC and the touch screen all-in-one machine are both connected with zero live wires.

4. The maintenance test platform for frequency converter according to claim 1, characterized in that: The frequency converter maintenance comprehensive test platform is further provided with a short-circuit protection circuit matched with the maintenance platform and the test platform, a first maintenance auxiliary circuit, a second maintenance auxiliary circuit and a voice broadcast function, the voice broadcast function is composed of a JQ8900 voice module and various function trigger signals, when the MCU collects a trigger signal from the PLC or a hard-wired circuit, corresponding number voice information in the voice module is called, and corresponding voice is emitted through a power amplification circuit and a loudspeaker to give a reminder.

5. The maintenance test platform for frequency converter according to claim 4, characterized in that: The short-circuit protection circuit is limited by three 3000 W 100 ohm resistors, and the load condition of the main circuit is judged by self-developed PCB voltage taking. When the normal current passes, the U, V and W phases are respectively displayed by the yellow, green and red lights. When the overcurrent or short-circuit current passes, the indicator light flashes rapidly, and the alarm contact and sound are output. When the overcurrent is not processed for more than 6 seconds, the PLC will send a command to close the test function. When the normal current passes through the current limiting resistor for 12 seconds, the PLC will output a command to short the current limiting resistor, and the main circuit outputs the normal 380V AC power supply.

6. The maintenance test platform of claim 4, wherein: The first maintenance auxiliary circuit generates a high-frequency square wave pulse through a NE555 bistable circuit, and the high-frequency square wave pulse is input from the U phase of the frequency converter, is returned to the V phase and the W phase by using the internal circuit, is amplified by the circuit and is utilized, the relay output is controlled, and the circuit can effectively prevent the misoperation of the wiring head when the wiring head is suspended.

7. The maintenance test platform of claim 4, wherein: The second maintenance auxiliary circuit is isolated from the AC 220V power supply, the DC 311V power supply, the 0-120V adjustable DC power supply and the large-capacitance discharge circuit, and can directly operate on the desktop of the test.

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