High-voltage frequency converter control circuit

Abstract

The utility model provides a high-voltage frequency converter control circuit and belongs to the frequency converter control field. The problem that the frequency converter main circuit is directly disconnected when the frequency converter auxiliary fan breaks down is solved. According to the technical scheme, the fan cooling device comprises a fan cooling module, the fan cooling module comprises a main circuit breaker QF16, the main circuit breaker QF16 is connected with one end of a first circuit breaker and one end of a second circuit breaker in parallel, the other end of the first circuit breaker and the other end of the second circuit breaker are electrically connected with a plurality of fans, the first circuit breaker comprises a circuit breaker QF31, a circuit breaker QF32 and a circuit breaker QF33, and the circuit breaker QF31 is connected with the main circuit breaker QF16. One normally-closed contact of the circuit breaker QF31 is connected in series with one normally-closed contact of the circuit breaker QF32 and one normally-closed contact of the circuit breaker QF33 and then is connected to an input 08 port of the high-voltage comprehensive protection device; one normally open contact of the circuit breaker QF31 is connected in series with one normally open contact of the circuit breaker QF32 and one normally open contact of the circuit breaker QF33 and then is connected to an input 07 port of the high-voltage comprehensive protection device; the utility model is applied to the frequency converter control circuit.

Description

Technical Field

[0001] The utility model provides a high-voltage frequency converter control circuit, belonging to the field of frequency converter control. Background Art

[0002] The high-voltage inverter cooling fan is mainly used to cool the IGBT modules, inductors and other components inside the inverter, reduce the overall temperature, and extend the service life of the inverter. In general, to ensure the safe operation of the high-voltage inverter, the inverter will be set with double protection. First, when the temperature sensor in the cabinet detects that the temperature is too high, it will interlock the inverter to shut down. Second, the auxiliary fan will be overcurrent protected and the power circuit breaker will trip to interlock the inverter to shut down. However, in order to ensure the continuous production of the enterprise, the reliable operation of the inverter is crucial. The current inverter circuit is simple, and the fault handling method for the high-voltage inverter cooling fan is single and the technology is imperfect. When the inverter auxiliary fan fails, the inverter main circuit is directly disconnected, resulting in equipment operation interruption, which cannot meet the requirements of the chemical industry for continuous and stable operation of equipment. Utility Model Content

[0003] In order to solve the technical problem that the inverter main circuit is directly disconnected when the inverter auxiliary fan fails, resulting in interruption of equipment operation, the utility model proposes a high-voltage inverter control circuit, the purpose of which is to improve the inverter fan circuit structure to ensure that the inverter can still operate continuously and stably when the inverter fan fails.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a high-voltage inverter control circuit, including a fan cooling module, the fan cooling module is electrically connected to a programmable logic controller;

[0005] The fan cooling module includes a main circuit breaker QF16, one end of the main circuit breaker QF16 is connected to a power source, the other end of the main circuit breaker QF16 is connected to one end of a first circuit breaker and one end of a second circuit breaker, and the other end of the first circuit breaker and the other end of the second circuit breaker are electrically connected to a plurality of fans;

[0006] The first circuit breaker includes circuit breaker QF31, circuit breaker QF32 and circuit breaker QF33;

[0007] A normally closed contact of the circuit breaker QF31 is connected in series with a normally closed contact of the circuit breaker QF32 and a normally closed contact of the circuit breaker QF33, and then connected to the input quantity 08 port of the high-voltage comprehensive protection device;

[0008] A normally open contact of the circuit breaker QF31 is connected in series with a normally open contact of the circuit breaker QF32 and a normally open contact of the circuit breaker QF33, and then connected to the input quantity 07 port of the high-voltage integrated protection device;

[0009] The programmable logic controller includes a cooling fan ready terminal I4, a cooling fan fault terminal I5, a frequency converter fan operation terminal Q7 and a frequency converter start terminal Q0;

[0010] The cooling fan ready terminal I4 and the cooling fan fault terminal I5 are both connected to the common terminal;

[0011] The inverter fan operation terminal Q7 is electrically connected to the coil of the intermediate relay K4;

[0012] A normally open contact of the intermediate relay K4 is electrically connected to a port on the terminal board XT15 and then connected to the input quantity 09 port of the high-voltage integrated protection device.

[0013] Furthermore, the other end of the main circuit breaker QF16 is connected in parallel to one end of the circuit breaker QF31, one end of the circuit breaker QF32 and one end of the circuit breaker QF33; the other end of the circuit breaker QF31 is connected to the terminal board XT31 and then electrically connected to the fan GV31 on the top of the transformer cabinet; the other end of the circuit breaker QF32 is electrically connected to the terminal board XT32 and then electrically connected to the fan GV32 on the top of the transformer cabinet; the other end of the circuit breaker QF33 is electrically connected to the terminal on the terminal board XT33 and then electrically connected to the fan GV33 on the top of the transformer cabinet.

[0014] Furthermore, the other end of the main circuit breaker QF16 is also connected in parallel to a fan power supply detection module.

[0015] Furthermore, the model of the main circuit breaker QF16 is ic65N-D 10A / 4P.

[0016] Furthermore, the model of the second circuit breaker is ic65N-D 6A / 2P.

[0017] Furthermore, the models of the circuit breakers QF31, QF32 and QF33 are GV2 ME06C.

[0018] Furthermore, the model of the high-voltage integrated protection device is PCS9611.

[0019] Furthermore, the model of the PLC module 1 is TM200CE40T.

[0020] Furthermore, the model of the PLC module three is TM3DI8G.

[0021] Furthermore, the model of the PLC module six is ​​TM2ARI8LT.

[0022] The beneficial effects of the utility model compared with the prior art are as follows: the utility model short-circuits both the cooling fan ready terminal I4 and the cooling fan fault terminal I5, connects a normally closed contact of the circuit breaker QF31 in series with a normally closed contact of the circuit breaker QF32 and a normally closed contact of the circuit breaker QF33 to the input port 08 of the high-voltage comprehensive protection device, and connects a normally open contact of the circuit breaker QF31 in series with a normally open contact of the circuit breaker QF32 and a normally open contact of the circuit breaker QF33 to the input port 07 of the high-voltage comprehensive protection device. Compared with the traditional fan fault signal connected to the programmable logic controller, the fan fault signal of the utility model is directly introduced into the high-voltage comprehensive protection device, and the cooling fan ready terminal I4 continues to work, avoiding the forced shutdown of the equipment due to the triggering of the fan fault shutdown interlocking function, and ensuring that the variable frequency motor can still run continuously and stably when the inverter auxiliary fan fails. At the same time, the operator can perform emergency repairs according to the early warning signal of the high-voltage comprehensive protection device to ensure the stability of the equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described below in conjunction with the accompanying drawings:

[0024] Figure 1 This is the fan cooling diagram of the variable frequency speed regulation system of the utility model;

[0025] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0026] Figure 3 for Figure 1 A magnified schematic diagram of part B;

[0027] Figure 4 for Figure 1 A magnified schematic diagram of part C;

[0028] Figure 5 for Figure 1 The enlarged schematic diagram of the D part;

[0029] Figure 6 for Figure 1 The enlarged schematic diagram of part E in the middle;

[0030] Figure 7 for Figure 1 The enlarged schematic diagram of part F in the middle;

[0031] Figure 8 This is the PLC system diagram of the variable frequency speed regulation system of the utility model;

[0032] Fig. 9 for Figure 8 A magnified schematic diagram of part G in the middle;

[0033] Fig.10for Figure 8 A magnified schematic diagram of the middle H section;

[0034] Fig.11 for Figure 8 An enlarged schematic diagram of part I;

[0035] Fig.12 for Figure 8 The enlarged schematic diagram of the middle J part;

[0036] Fig.13 for Figure 8 A magnified schematic diagram of the K portion;

[0037] Fig.14 for Figure 8 An enlarged schematic diagram of the L portion;

[0038] Fig.15 for Figure 8 A magnified schematic diagram of the middle M part;

[0039] Fig.16 for Figure 8 An enlarged schematic diagram of the N portion;

[0040] Fig.17 for Figure 8 The enlarged schematic diagram of the P part;

[0041] Fig.18 This is an enlarged schematic diagram of the DSP adapter board;

[0042] Fig.19 This is an enlarged diagram of the cabinet door button wiring diagram. DETAILED DESCRIPTION

[0043] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0044] like Figures 1 to 19As shown, the utility model provides a high-voltage inverter control circuit, including a fan cooling module, and the fan cooling module is electrically connected to a programmable logic controller. The fan cooling module includes a main circuit breaker QF16, one end of the main circuit breaker QF16 is connected to the power supply of the three-phase four-wire cooling system, and the other end of the main circuit breaker QF16 is connected to one end of the first circuit breaker, one end of the second circuit breaker and the fan power supply detection module, and the other end of the first circuit breaker and the other end of the second circuit breaker are electrically connected to a plurality of fans, and the first circuit breaker includes circuit breakers QF31, QF32, and QF33. In this embodiment, the other end of the main circuit breaker QF16 is connected in parallel to one end of the circuit breaker QF31, one end of the circuit breaker QF32, one end of the circuit breaker QF33 and one end of the circuit breaker QF18; the other end of the circuit breaker QF31 is electrically connected to the three ports of the terminal board XT31 and then electrically connected to the three-phase power supply of the fan GV31 on the top of the transformer cabinet; the other end of the circuit breaker QF32 is electrically connected to the three ports on the terminal board XT32 and then electrically connected to the three-phase power supply of the fan GV32 on the top of the transformer cabinet; the other end of the circuit breaker QF33 is electrically connected to the three ports on the terminal board XT33 and then electrically connected to the three-phase power supply of the fan GV33 on the top of the transformer cabinet; the other end of the circuit breaker QF18 is connected in parallel to several fans at the bottom of the transformer cabinet.

[0045] The fan GV31 on the top of the transformer cabinet also includes a normally closed switch 1, one end of which is electrically connected to the 5-port of the terminal board XT31 and then to the 3-port of the terminal board XT19, and the other end of which is electrically connected to the 6-port of the terminal board XT31 and then to the 31-port of the terminal board XT12; the fan GV32 on the top of the transformer cabinet also includes a normally closed switch 2, one end of which is electrically connected to the 5-port of the terminal board XT32, and the other end of which is electrically connected to the 6-port of the terminal board XT32 and then to the 32-port of the terminal board XT12; GV32 also includes a normally closed switch 3, one end of which is electrically connected to the 5-port of the terminal board XT33, and the other end of which is electrically connected to the 6-port of the terminal board XT33 and then to the 33-port of the terminal board XT12, and the 5-port of the terminal board XT32 and the 5-port of the terminal board XT33 are connected in parallel and then electrically connected to the 5-port of the terminal board XT31.

[0046] A normally closed contact of circuit breaker QF31 is connected in series with a normally closed contact of circuit breaker QF32 and a normally closed contact of circuit breaker QF33, and then connected to the input port 08 of the high-voltage integrated protection device. A normally open contact of circuit breaker QF31 is connected in series with a normally open contact of circuit breaker QF32 and a normally open contact of circuit breaker QF33, and then connected to the input port 07 of the high-voltage integrated protection device. When an overcurrent fault occurs in the fan, the normally closed contact of circuit breaker QF31 and / or the normally closed contact of circuit breaker QF32 and / or the normally closed contact of circuit breaker QF33 are disconnected, and the input port 08 of the high-voltage integrated protection device sends out an alarm message after receiving the overcurrent fault signal of the fan. The operator performs emergency repair work according to the overcurrent fault information to ensure the stability of equipment operation. When the fan has a circuit breaker trip fault, the normally open contacts of the circuit breaker QF31 and / or the normally open contacts of the circuit breaker QF32 and / or the normally open contacts of the circuit breaker QF33 are closed, and the input port 07 of the high-voltage integrated protection device receives the fan circuit breaker trip fault signal and issues an alarm message. The operator performs emergency repairs based on the circuit breaker trip fault information to ensure the stability of the equipment operation. This ensures that the variable frequency motor can continue to operate stably when the inverter fan fails.

[0047] The fan power supply detection module is a prior art, and at least includes a fuse and a relay coil. In this embodiment, a coil of a relay K1d, a coil of a relay K1e, and a coil of a relay K1f are provided.

[0048] The programmable logic controller includes PLC module 1, PLC module 3 and PLC module 6. The controller ready terminal I0, standby terminal I1, inverter minor fault terminal I2 and inverter major fault terminal I3 of PLC module 1 are electrically connected to ports 10 to 13 of interface J1 respectively. The cooling fan ready terminal I4 and cooling fan fault terminal I5 of PLC module 1 are both connected to the COM terminal of PLC module 1, that is, the cooling fan ready terminal I4 of PLC module 1 and the cooling fan fault terminal I5 of PLC module 1 are both short-circuited.

[0049] The fan power failure terminal I7 of PLC module 1 is connected to a normally closed contact of relay K1d, a normally closed contact of relay K1e and a normally closed contact of relay K1f, and then connected to port 25 of terminal board XT12. Port 25 of terminal board XT12 is also electrically connected to the 24V power supply terminal of PLC module 6. The local / remote terminal I8 of PLC module 1, the cabinet door alarm release terminal I9 of PLC module 1, the cabinet door system reset terminal I10 of PLC module 1 and the cabinet door main power emergency disconnection terminal I11 of PLC module 1 are respectively connected in series with a switch and then connected to port 13 of terminal board XT12. The remote start terminal I19, remote stop terminal I20, remote free stop terminal I21, standby terminal I22 and high voltage ready terminal I23 of PLC module 1 are respectively connected to ports 1 to 5 of terminal board XT11, and port 8, port 9, port 10, port 11 and port 12 of terminal board XT11 are short-circuited and electrically connected to the switching power supply.

[0050] The inverter start terminal Q0 of PLC module 1 is connected to port 5 of interface J1, the inverter stop terminal Q1 of PLC module 1 is connected to port 2 of interface J1, the inverter emergency stop terminal Q2 of PLC module 1 is connected to port 4 of interface J1, and port 1 of interface J1 is electrically connected to port 3 of terminal board XT19. The inverter standby terminal Q6 of PLC module 1 is electrically connected to one end of the relay K3 coil, and the other end of the relay K3 coil is connected to port 19 of terminal board XT12; the inverter fan running terminal Q7 of PLC module 1 is electrically connected to one end of the relay K4 coil, and the other end of the relay K4 coil is connected to port 19 of terminal board XT12. The inverter alarm terminal Q8 of PLC module 1, the total closing permission terminal Q9 of PLC module 1, the total emergency disconnection terminal Q10 of PLC module 1, the inverter minor fault output terminal Q11 of PLC module 1, the inverter major fault output terminal Q12 of PLC module 1, and the inverter remote terminal Q13 of PLC module 1 are all connected to the 19th port of the terminal board XT12. A normally open contact of the intermediate relay K4 is electrically connected to the terminal board XT15 and then connected to the input quantity 09 port of the high-voltage comprehensive protection device. The operating status of the inverter fan can be viewed on the display device of the high-voltage comprehensive protection device.

[0051] Ports 26 to 28 of the terminal board XT15 are electrically connected to the interface J2, and the port 26 of the terminal board XT15 is short-circuited with the port 27 of the terminal board XT15. The interface J1 and the interface J2 are located on the DSP adapter board.

[0052] Port 11 of the terminal board XT12 is electrically connected to the control cabinet rear door travel switch BQ11, and the control cabinet rear door travel switch BQ11 is connected in series with several transformer cabinet travel switches and several power cabinet travel switches and then connected to port 8 of the terminal board XT12.

[0053] Port 31 of terminal board XT12 is also electrically connected to the overheating port of fan GV31 of PLC module three, port 32 of terminal board XT12 is also electrically connected to the overheating port of fan GV32 of PLC module three, and port 33 of terminal board XT12 is also electrically connected to the overheating port of fan GV33 of PLC module three.

[0054] The main circuit breaker is QF16 and the model of the second circuit breaker is ic65N-D.

[0055] The model of circuit breaker QF31, circuit breaker QF32 and circuit breaker QF33 is GV2 ME06C.

[0056] The model of the high voltage integrated protection device is PCS9611.

[0057] The model of PLC module one is TM200CE40T, the model of PLC module three is TM3DI8G, and the model of PLC module six is ​​TM2ARI8LT.

[0058] The working principle of this utility model:

[0059] When one or more fans have an overcurrent fault, the normally closed contact of the first circuit breaker is disconnected, and the high-voltage integrated protection device sends out an alarm message after receiving the fan overcurrent fault signal at the input port 08; when the fan has an air breaker tripping fault, the normally open contact of the first circuit breaker is closed, and the high-voltage integrated protection device sends out an alarm message after receiving the fan air breaker tripping fault signal at the input port 07. The operator performs emergency repairs based on the alarm information to ensure the stability of the equipment operation, thereby ensuring that the variable frequency motor can continue to operate stably when the fan fails. The fan operation signal of the utility model is connected to the input port 09 of the high-voltage integrated protection device, which can facilitate the operator to monitor the operating status of the fan.

[0060] Regarding the specific structure of the utility model, it should be explained that the connection relationship between the various component modules adopted in the utility model is definite and feasible. Except for special instructions in the embodiments, the specific connection relationship can bring corresponding technical effects and solve the technical problems raised by the utility model without relying on the execution of corresponding software programs. The components, modules, models of specific components and the connection methods between each other appearing in the utility model, as well as the conventional use methods and expected technical effects brought about by the above-mentioned technical features, except for specific instructions, all belong to the disclosed contents in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by technical personnel in this field before the application date, or belong to the existing technologies such as conventional technologies and common knowledge in this field, and there is no need to elaborate, so that the technical solution provided in this case is clear, complete and feasible, and the corresponding physical products can be reproduced or obtained according to the technical means.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A high voltage inverter control circuit, characterized in that: It includes a fan cooling module, wherein the fan cooling module is electrically connected to a programmable logic controller; The fan cooling module includes a main circuit breaker QF16, one end of the main circuit breaker QF16 is connected to a power source, the other end of the main circuit breaker QF16 is connected to one end of a first circuit breaker and one end of a second circuit breaker, and the other end of the first circuit breaker and the other end of the second circuit breaker are both electrically connected to a plurality of fans; The first circuit breaker includes circuit breaker QF31, circuit breaker QF32 and circuit breaker QF33; A normally closed contact of the circuit breaker QF31 is connected in series with a normally closed contact of the circuit breaker QF32 and a normally closed contact of the circuit breaker QF33, and then connected to the input quantity 08 port of the high-voltage comprehensive protection device; A normally open contact of the circuit breaker QF31 is connected in series with a normally open contact of the circuit breaker QF32 and a normally open contact of the circuit breaker QF33, and then connected to the input quantity 07 port of the high-voltage integrated protection device; The programmable logic controller includes a cooling fan ready terminal I4, a cooling fan fault terminal I5, a frequency converter fan operation terminal Q7 and a frequency converter start terminal Q0; The cooling fan ready terminal I4 and the cooling fan fault terminal I5 are both connected to the common terminal; The inverter fan operation terminal Q7 is electrically connected to the coil of the intermediate relay K4; A normally open contact of the intermediate relay K4 is electrically connected to a port on the terminal board XT15 and then connected to the input quantity 09 port of the high-voltage integrated protection device.

2. A high voltage inverter control circuit according to claim 1, characterized in that: The other end of the main circuit breaker QF16 is connected in parallel to one end of the circuit breaker QF31, one end of the circuit breaker QF32 and one end of the circuit breaker QF33. The other end of the circuit breaker QF31 is connected to the terminal board XT31 and then electrically connected to the fan GV31 on the top of the transformer cabinet. The other end of the circuit breaker QF32 is electrically connected to the terminal board XT32 and then electrically connected to the fan GV32 on the top of the transformer cabinet. The other end of the circuit breaker QF33 is electrically connected to the terminal on the terminal board XT33 and then electrically connected to the fan GV33 on the top of the transformer cabinet.

3. A high voltage inverter control circuit according to claim 1, characterized in that: The other end of the main circuit breaker QF16 is also connected in parallel with a fan power supply detection module.

4. A high voltage inverter control circuit according to claim 1, characterized in that: The model of the main circuit breaker QF16 is ic65N-D 10A / 4P.

5. A high voltage inverter control circuit according to claim 1, characterized in that: The model of the second circuit breaker is ic65N-D 6A / 2P.

6. A high voltage inverter control circuit according to claim 1, characterized in that: The models of the circuit breakers QF31, QF32 and QF33 are GV2 ME06C.

7. A high voltage inverter control circuit according to claim 1, characterized in that: The model of the high-voltage integrated protection device is PCS9611.

Images