A frequency converter control hub

Abstract

The application provides a frequency converter control hub, which comprises a frequency converter connecting end, a control system connecting end, a frequency setting and feedback module connecting end, an operating state indication module connecting end and a mode selection switch, and is connected with a frequency converter, a control system, a frequency setting and feedback module and an operating state indication module through the frequency converter connecting end, the control system connecting end, the frequency setting and feedback module connecting end and the operating state indication module connecting end respectively. The frequency converter control hub of the application realizes one-key switching between manual and automatic modes of the frequency converter, simultaneously provides manual control related functions of the frequency converter, can transmit manual and automatic control signals and frequency converter feedback signals, serves as a signal transmission bridge between other modules, avoids complex wiring between devices, greatly reduces wiring difficulty, and makes construction and maintenance more convenient.

Description

Technical Field

[0001] This invention belongs to the field of frequency converter control technology, and in particular relates to a frequency converter control center. Background Technology

[0002] Advanced frequency converter control systems typically include both manual and automatic modes. Under normal circumstances, the system operates in automatic mode, where the automatic control system determines the inverter's start / stop and output frequency. However, in special situations such as automatic control system failure, testing, or maintenance, manual control is required to ensure the inverter continues to operate and related equipment functions properly.

[0003] To achieve the above functions, the present invention provides a frequency converter control hub, which is used to switch between manual and automatic modes of the frequency converter, provide manual control related functions of the frequency converter, and transmit manual and automatic control signals and frequency converter feedback signals. Summary of the Invention

[0004] In view of this, the present invention aims to overcome the shortcomings of the above-mentioned problems in the prior art and proposes a frequency converter control center.

[0005] To achieve the above objectives, the technical solution created by this invention is implemented as follows:

[0006] A frequency converter control hub includes a frequency converter connection terminal, a control system connection terminal, a frequency setting and feedback module connection terminal, an operating status indicator module connection terminal, and a mode selection switch. The control hub is connected to the frequency converter, the control system, the frequency setting and feedback module, and the operating status indicator module through the frequency converter connection terminal, the control system connection terminal, the frequency setting and feedback module connection terminal, and the operating status indicator module connection terminal, respectively.

[0007] The inverter connection terminal includes interface C. B1 C B2 C B3 C B4 C B5 C B6 C B7 C B8 C B9 C B10 C B11 C B12 C B13 C B14 C B15 C B16 C B17 The control system connection terminal includes interface C. K1 C K2 C K3 C K4C K5 C K6 C K7 C K8 C K9 The frequency setting and feedback module connection terminal includes interface C. P1 C P2 C P3 C P4 C P5 The operating status indicator module connection terminal includes interface C. Y1 C Y2 C Y3 ;

[0008] The interface C B1 One side connects to the positive terminal of the frequency input in automatic mode of the frequency converter, and the other side connects to interface C. K1 Through interface C K1 Connect the positive terminal of the automatic mode frequency output of the control system.

[0009] The interface C B2 One side connects to the negative terminal of the frequency input in automatic mode of the frequency converter, and the other side connects to interface C. K2 Through interface C K2 Connect the negative terminal of the automatic mode frequency output of the control system.

[0010] The interface C B3 One side is connected to the positive terminal of the first frequency feedback output of the frequency converter, and the other side is connected to interface C. K3 Through interface C K3 Connect the positive terminal of the first frequency feedback input to the control system.

[0011] The interface C B4 One side is connected to the negative terminal of the first frequency feedback output of the frequency converter, and the other side is connected to interface C. K4 Through interface C K4 Connect the negative terminal of the first frequency feedback input to the control system.

[0012] The interface C B7 One side connects to the inverter's built-in DC 24V+ terminal, and the other side connects via node C. Z3 Divided into 3 routes:

[0013] The first path passes through node C. Z2 Connect one side of the relay J1 coil to the negative terminal of diode VD1, and connect the other side of the J1 coil and the positive terminal of VD1 to node C. Z1 C Z1 After connecting fuse FU1 in series, then through interface C B6 Connect to the inverter's built-in DC 24V;

[0014] The normally open switch of the second series relay J3 3-1 Then through interface C B5 Connect the inverter's automatic mode start signal input terminal;

[0015] The third path passes through node C. Z4 It is then split into two paths, one of which is connected in series with a normally open switch K. 1-1 Then through interface C B8 Connect the manual start signal input terminal of the frequency converter; connect the other terminal in series with a normally open switch K. 2-1 Then through interface C B9 Connect the automatic mode signal input terminal of the frequency converter;

[0016] The interface C B10 One side is connected to the manual frequency input terminal of the frequency converter, and the other side is connected in series with a normally open switch K. 1-2 Rear connection interface C P1 Through interface C P1 Connect the frequency setting and feedback module to the frequency setting value output terminal;

[0017] The interface C B11 One side connects to the inverter's built-in DC 10V, and the other side connects to interface C. P2 Through interface C P2 Connect the frequency setting and feedback module to the negative terminal of the frequency setting signal source;

[0018] The interface C B12 One side connects to the inverter's built-in DC 10V+, and the other side connects to interface C. P3 Through interface C P3 Connect the positive terminal of the frequency setting signal source to the frequency setting and feedback module;

[0019] The interface C B13 One side connects to the positive terminal of the second frequency feedback output of the frequency converter, and the other side connects to interface C. P4 Through interface C P4 Connect the positive terminal of the second frequency feedback input of the frequency setting and feedback module;

[0020] The interface C B14 One side connects to the negative terminal of the second frequency feedback output of the frequency converter, and the other side connects to interface C. P5 Through interface C P5 Connect the negative terminal of the second frequency feedback input of the frequency setting and feedback module;

[0021] The interface C B15 One side connects to the inverter's fault signal output terminal, and the other side connects to interface C. Y1 Through interface C Y1 Connect the inverter's abnormal signal terminal to the operating status indicator module;

[0022] The interface C B16 One side is connected to the normal signal output terminal of the frequency converter, and the other side is connected through node C. Z5 It is divided into two paths: the first path connects to interface C. Y2 Through interface C Y2 Connect the inverter's normal signal terminal to the operating status indicator module; after connecting the second circuit with fuse FU2 in series, at node C... Z6 Connect one side of the relay J2 coil to the negative terminal of diode VD2, and connect the other side of the J2 coil to node C. Z7 VD2 positive terminal connection node C Z8 Node C Z7 and C Z8 By shorting with a jumper wire, node C Z8 Connection interface C K7 Through interface C K7 Connect the DC 24V power supply to the control system.

[0023] The interface C Y3 One side connects to the COM port of the running status indicator module, and the other side connects to node C. Z7 And then through interface C K7 Connect the DC 24V power supply to the control system.

[0024] The interface C B17 One side is connected to the COM terminal of the inverter's positive / abnormal indicator, and the other side is connected in series with relay J1 and normally open switch J. 1-1 Then, at node C Z9 It is divided into two paths: the first path is through interface C. K8 Connect to the DC 24V+ power supply at the control system end; the second path goes through node C. Z10 Connect one side of the relay J3 coil to the negative terminal of diode VD3, and connect the other side of the J3 coil and the positive terminal of VD3 to node C. Z11 Then through node C Z11 Connect the collector of Darlington transistor DT1, and the emitter of DT1 is connected through node C. Z12 Connection interface C K7 Then connect to the DC 24V power supply of the control system. After connecting potentiometer RP1 and fixed resistor R1 in series with the base of DT1, it is connected through interface C. K9 Connect the automatic start signal output terminal of the control system;

[0025] The interface C K5 One end is connected to the on-state signal terminal of the frequency converter in the control system, and the other end is connected in series with a normally open switch K. 2-2 Relay J2 normally open switch J 2-1 Rear connection interface C K6 Through interface C K6Connect the inverter's on-state signal source to the control system.

[0026] The mode selection switch is a rotary switch, and the control switch K is also mentioned. 1-1 K 1-2 K 2-1 K 2-2 Among them, switch K 1-1 K 1-2 These are interlocking switches; both open or close synchronously. Switch K 2-1 K 2-2 It is a linkage switch, and the two open or close synchronously.

[0027] Furthermore, the mode selection switch has three positions:

[0028] Middle position: Stop mode, K 1-1 K 1-2 K 2-1 K 2-2 Disconnect all;

[0029] Rotate counterclockwise to position: Manual start, K 1-1 K 1-2 Closed, K 2-1 K 2-2 disconnect;

[0030] Clockwise rotation position: Automatic mode, K 1-1 K 1-2 Disconnect, K 2-1 K 2-2 closure.

[0031] Furthermore, the control system includes a DDC controller.

[0032] Furthermore, the frequency setting and feedback module includes a potentiometer and a frequency meter, used to input the inverter frequency requirement through the potentiometer in manual mode, and to display the actual output frequency of the inverter in manual and automatic operation modes through the frequency meter.

[0033] Furthermore, the operating status indicator module includes alarm sounds and indicator lights to display the inverter status.

[0034] Compared with existing technologies, the inverter control center described in this invention has the following advantages:

[0035] (1) The frequency converter control center provided by the present invention has two control modes: manual and automatic, and the two modes can be switched with one key.

[0036] (2) The inverter control center provided by the present invention is interlocked between manual and automatic modes, that is, in automatic control mode, the manual control line is cut off; in manual control mode, the automatic control line is cut off.

[0037] (3) The inverter control center provided by this invention provides dedicated signal interfaces for automatic and manual modes, respectively. That is, its automatic start signal, manual start signal, automatic frequency input, and manual frequency input each have independent interfaces. By adjusting the wiring method, it can be compatible with the control requirements of various inverters.

[0038] (4) The frequency converter control hub provided by the present invention serves as a signal transmission bridge between multiple modules such as frequency converter, automatic control system, frequency setting and feedback module, and operation status indication module. All signals are transmitted through this hub, thereby avoiding complex wiring between equipment, greatly reducing wiring difficulty, and making construction and maintenance more convenient. Attached Figure Description

[0039] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0040] Figure 1 A circuit diagram of a frequency converter control center created for this invention;

[0041] Figure 2 This is a schematic diagram illustrating the connection between a frequency converter control center and external equipment, as described in this invention. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] like Figure 1-2 As shown, this invention provides a frequency converter control hub, including a circuit board and frequency converter connection terminals, control system connection terminals, frequency setting and feedback module connection terminals, operating status indicator module connection terminals, and mode selection switches disposed on the circuit board. The control hub is connected to the frequency converter, control system, frequency setting and feedback module, and operating status indicator module respectively through the frequency converter connection terminals, control system connection terminals, frequency setting and feedback module connection terminals, and operating status indicator module connection terminals. It should be noted that the frequency converter, control system, frequency setting and feedback module, operating status indicator module, and mode selection switch used in this invention are all existing products commonly used in the art.

[0047] Specifically, the inverter connection terminal includes interface C. B1 C B2 C B3 C B4 C B5 C B6 C B7 C B8 C B9 C B10 C B11 C B12 C B13 C B14 C B15 C B16 C B17 The control system connection terminal includes interface C. K1 C K2 C K3 C K4 C K5 C K6 C K7 C K8 C K9 The frequency setting and feedback module connection terminal includes interface C. P1 C P2 CP3 C P4 C P5 The operating status indicator module connection terminal includes interface C. Y1 C Y2 C Y3 ;

[0048] The interface C B1 One side connects to the positive terminal of the frequency input in automatic mode of the frequency converter, and the other side connects to interface C. K1 Through interface C K1 Connect the positive terminal of the automatic mode frequency output of the control system.

[0049] The interface C B2 One side connects to the negative terminal of the frequency input in automatic mode of the frequency converter, and the other side connects to interface C. K2 Through interface C K2 Connect the negative terminal of the automatic mode frequency output of the control system.

[0050] The interface C B3 One side is connected to the positive terminal of the first frequency feedback output of the frequency converter, and the other side is connected to interface C. K3 Through interface C K3 Connect the positive terminal of the first frequency feedback input to the control system.

[0051] The interface C B4 One side is connected to the negative terminal of the first frequency feedback output of the frequency converter, and the other side is connected to interface C. K4 Through interface C K4 Connect the negative terminal of the first frequency feedback input to the control system.

[0052] The interface C B7 One side connects to the inverter's built-in DC 24V+ terminal, and the other side connects via node C. Z3 Divided into 3 routes:

[0053] The first path passes through node C. Z2 Connect one side of the relay J1 coil to the negative terminal of diode VD1, and connect the other side of the J1 coil and the positive terminal of VD1 to node C. Z1 C Z1 After connecting fuse FU1 in series, then through interface C B6 Connect to the inverter's built-in DC 24V;

[0054] The normally open switch of the second series relay J3 3-1 Then through interface C B5 Connect the inverter's automatic mode start signal input terminal;

[0055] The third path passes through node C. Z4 It is then split into two paths, one of which is connected in series with a normally open switch K.1-1 Then through interface C B8 Connect the manual start signal input terminal of the frequency converter; connect the other terminal in series with a normally open switch K. 2-1 Then through interface C B9 Connect the automatic mode signal input terminal of the frequency converter;

[0056] The interface C B10 One side is connected to the manual frequency input terminal of the frequency converter, and the other side is connected in series with a normally open switch K. 1-2 Rear connection interface C P1 Through interface C P1 Connect the frequency setting and feedback module to the frequency setting value output terminal;

[0057] The interface C B11 One side connects to the inverter's built-in DC 10V, and the other side connects to interface C. P2 Through interface C P2 Connect the frequency setting and feedback module to the negative terminal of the frequency setting signal source;

[0058] The interface C B12 One side connects to the inverter's built-in DC 10V+, and the other side connects to interface C. P3 Through interface C P3 Connect the positive terminal of the frequency setting signal source to the frequency setting and feedback module;

[0059] The interface C B13 One side connects to the positive terminal of the second frequency feedback output of the frequency converter, and the other side connects to interface C. P4 Through interface C P4 Connect the positive terminal of the second frequency feedback input of the frequency setting and feedback module;

[0060] The interface C B14 One side connects to the negative terminal of the second frequency feedback output of the frequency converter, and the other side connects to interface C. P5 Through interface C P5 Connect the negative terminal of the second frequency feedback input of the frequency setting and feedback module;

[0061] The interface C B15 One side connects to the inverter's fault signal output terminal, and the other side connects to interface C. Y1 Through interface C Y1 Connect the inverter's abnormal signal terminal to the operating status indicator module;

[0062] The interface C B16 One side is connected to the normal signal output terminal of the frequency converter, and the other side is connected through node C. Z5 It is divided into two paths: the first path connects to interface C. Y2 Through interface C Y2Connect the inverter's normal signal terminal to the operating status indicator module; after connecting the second circuit with fuse FU2 in series, at node C... Z6 Connect one side of the relay J2 coil to the negative terminal of diode VD2, and connect the other side of the J2 coil to node C. Z7 VD2 positive terminal connection node C Z8 Node C Z7 and C Z8 By shorting with a jumper wire, node C Z8 Connection interface C K7 Through interface C K7 Connect the DC 24V power supply to the control system.

[0063] The interface C Y3 One side connects to the COM port of the running status indicator module, and the other side connects to node C. Z7 And then through interface C K7 Connect the DC 24V power supply to the control system.

[0064] The interface C B17 One side is connected to the COM terminal of the inverter's positive / abnormal indicator, and the other side is connected in series with relay J1 and normally open switch J. 1-1 Then, at node C Z9 It is divided into two paths: the first path is through interface C. K8 Connect to the DC 24V+ power supply at the control system end; the second path goes through node C. Z10 Connect one side of the relay J3 coil to the negative terminal of diode VD3, and connect the other side of the J3 coil and the positive terminal of VD3 to node C. Z11 Then through node C Z11 Connect the collector (C) of Darlington transistor DT1, and the emitter (E) of DT1 is connected through node C. Z12 Connection interface C K7 Then connect to the DC 24V power supply of the control system. After connecting potentiometer RP1 and fixed resistor R1 in series with the base (B) of DT1, it is connected through interface C. K9 Connect the automatic start signal output terminal of the control system;

[0065] The interface C K5 One end is connected to the on-state signal terminal of the frequency converter in the control system, and the other end is connected in series with a normally open switch K. 2-2 Relay J2 normally open switch J 2-1 Rear connection interface C K6 Through interface C K6 Connect the inverter's on-state signal source to the control system.

[0066] The mode selection switch is a rotary switch, and the control switch K is also mentioned. 1-1 K 1-2 K 2-1 K2-2 Among them, switch K 1-1 K 1-2 These are interlocking switches; both open or close synchronously. Switch K 2-1 K 2-2 It is a linkage switch, and the two open or close synchronously.

[0067] Specifically, the mode selection switch has three positions:

[0068] Middle position: Stop mode, K 1-1 K 1-2 K 2-1 K 2-2 Disconnect all;

[0069] Rotate counterclockwise to position: Manual start, K 1-1 K 1-2 Closed, K 2-1 K 2-2 disconnect;

[0070] Clockwise rotation position: Automatic mode, K 1-1 K 1-2 Disconnect, K 2-1 K 2-2 closure.

[0071] Specifically, the control system includes a DDC controller. When the user selects the automatic mode, the controller sends start / stop, frequency requirements, and other parameters to the frequency converter according to the program settings and provides DC 24V power.

[0072] Specifically, the frequency setting and feedback module includes a potentiometer and a frequency meter, which are used to input the frequency requirement of the frequency converter through the potentiometer in manual mode, and to display the actual output frequency of the frequency converter in manual and automatic operation modes through the frequency meter.

[0073] Specifically, the operating status indicator module includes alarm sounds and indicator lights, which display the inverter's self-test status, such as normal or abnormal.

[0074] In this invention, a switch K3 is provided between the COM terminal of the frequency converter and the normal signal output terminal and the abnormal signal output terminal of the frequency converter.

[0075] The working process of this invention is as follows:

[0076] After the frequency converter is powered on, it outputs its own DC 10V and DC 24V power. After the control system starts, it outputs DC 24V power.

[0077] After the inverter is powered by its own DC 24V supply, relay J1 is energized, and its normally open switch J... 1-1Engage the circuit by connecting the DC24V+ control system to the positive / abnormal indicator COM terminal of the frequency converter. Based on its operating status, the frequency converter internally connects the COM terminal to the abnormal status output interface (interface C) via switch K3. B15 ) or normal state output interface (interface C) B16 ).

[0078] When the inverter self-test fails, switch K3 connects to interface C. B15 When relay J2 is de-energized, its normally open switch J 2-1 Disconnect. Simultaneously, the inverter fault signal terminal (interface C) of the operating status indicator module... Y1 When DC 24V+ is connected, the fault indicator LED1 illuminates. The negative terminal of fault indicator LED1 is internally connected to its COM terminal and connected via interface C. Y3 Connect to DC 24V.

[0079] When the inverter self-test is normal, switch K3 connects to interface C. B16 When relay J2 is energized, its normally open switch J 2-1 Engage. Simultaneously, the inverter normal signal terminal (interface C) of the operating status indicator module... Y2 When DC 24V+ is connected, the normal indicator LED2 illuminates. The negative terminal of LED2 is internally connected to its COM terminal and connected via interface C. Y3 Connect to DC 24V.

[0080] The mode selection switch X1 has three positions, corresponding to stop mode, manual start, and automatic mode. The specific usage instructions are as follows:

[0081] (1) Stop mode:

[0082] X1 is in the middle position, K 1-1 K 1-2 K 2-1 K 2-2 All switches are off. At this time, due to switch K... 1-1 Disconnect the inverter manual start signal input terminal (interface C) B8 Without a DC 24V+ start signal, it does not enter manual operation; this is due to switch K. 2-1 Disconnect, automatic mode signal input terminal (interface C) B9 Without a DC 24V+ start signal, the inverter does not enter automatic control mode. Therefore, the inverter does not operate in stop mode due to the lack of a start signal. Furthermore, due to switch K... 2-2 Disconnect, control system frequency converter at the value signal terminal (interface C) K5 The system cannot receive the inverter's on-duty signal. According to its internal programming, the control system can only send a start signal (interface C) to the on-duty inverter.K9 Therefore, when the inverter is not at its value, C K9 There is no starting current signal, meaning there is no current at the base (B) of the Darlington transistor. At this time, the collector (C) and emitter (E) of the Darlington transistor are not conducting, relay J3 is de-energized, and its normally open switch J... 3-1 Disconnect, inverter automatic mode start signal terminal (interface C) B5 The inability to receive the DC 24V+ start signal further ensures that the inverter will not operate in stop mode.

[0083] (2) Manual start:

[0084] X1 is in the left-hand (counter-clockwise) position, K 1-1 K 1-2 Closed, K 2-1 K 2-2 Disconnect. At this time, the inverter receives a DC24V+ manual start signal (interface C). B8 And the inverter's manual frequency input terminal (interface C) B10 It can receive the frequency setting value output from the frequency setting and feedback module (interface C). P1 The frequency setting source is the inverter's built-in DC 10V voltage. The frequency setting value is adjusted via potentiometer RP2, etc., at the output terminal (interface C). P1 The analog output allows for frequency regulation of the inverter. The second frequency feedback output terminal (C) B13 C B14 The actual frequency is then fed back to the frequency setting and feedback module and displayed through the frequency meter and other components within that module. Simultaneously, all signals are disconnected in automatic mode, the same as in stop mode, and will not be elaborated further.

[0085] (3) Automatic mode:

[0086] X1 is in the right-hand (counter-clockwise) position, K 1-1 K 1-2 Disconnect, K 2-1 K 2-2 Closed. Because of switch K. 2-1 Close, inverter automatic mode signal input terminal (interface C) B9 Upon receiving a DC 24V+ start signal, the system enters automatic control mode. When the inverter self-test is normal and relay J2 is powered on, switch K... 2-2 and J 2-1 All connections are closed, and the control system receives the inverter's on-state signal (interface C). K5 The system automatically controls the frequency converter according to the programmed settings: when the frequency converter needs to be started, the control system initiates automatic control via interface C. K9An automatic mode start-up current signal is issued, such as a standard control current signal of 4-20mA, the specific value of which is not limited. A fixed resistor R1 and potentiometer RP1 are used to control and adjust the magnitude of this control current. Darlington transistor DT1 amplifies this current by a certain factor, forming a sufficiently large current between the collector and emitter, driving relay J3 to power on and making its normally open switch J... 3-1 The circuit is closed, thus inputting the inverter's built-in DC 24V+ voltage into the inverter's automatic mode start signal terminal (interface C). B5 The control system also sends an automatic mode frequency signal (interface C). K1 C K2 The frequency converter receives the aforementioned automatic control signals and operates according to the instructions. In addition, the frequency converter also provides first frequency feedback (interface C). B3 C B4 The second frequency feedback feeds back the actual frequency to the control system for closed-loop control. Of course, the second frequency feedback also outputs the actual frequency synchronously, the same as in manual mode, so it will not be elaborated further. Simultaneously, all signals are disconnected in manual mode, the same as in stop mode, so it will not be elaborated further.

[0087] Diodes VD1, VD2, and VD3 are freewheeling diodes to prevent the induced electromotive force on the coil from damaging the control center after the relay is de-energized; fuses FU1 and FU2 are used to prevent excessive control current from damaging the control center.

[0088] In summary, the inverter control center provided by this invention features both manual and automatic control modes, which can be switched with a single button. The manual and automatic modes are interlocked; that is, in automatic control mode, the manual control circuit is disconnected, and vice versa. Dedicated signal interfaces are provided for both automatic and manual modes, meaning their automatic start signal, manual start signal, automatic frequency input, and manual frequency input each have independent interfaces. By adjusting the wiring method, it can meet the control requirements of various inverters.

[0089] Furthermore, the inverter control center provided by this invention serves as a signal transmission bridge between multiple devices and modules, such as the inverter, control system, frequency setting and feedback module, and operating status indication module. All signals are transmitted through this center, thereby avoiding complex wiring between devices, greatly reducing wiring difficulty, and making construction and maintenance more convenient.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A frequency converter control hub, characterized by: The control center is connected with the frequency converter, the control system, the frequency setting and feedback module and the running state indicating module through the frequency converter connecting end, the control system connecting end, the frequency setting and feedback module connecting end and the running state indicating module connecting end respectively. The frequency converter connection end includes interface C B1 , C B2 , C B3 , C B4 , C B5 , C B6 , C B7 , C B8 , C B9 , C B10 , C B11 , C B12 , C B13 , C B14 , C B15 , C B16 , C B17 ; the control system connection end includes interface C K1 , C K2 , C K3 , C K4 , C K5 , C K6 , C K7 , C K8 , C K9 ; the frequency setting and feedback module connection end includes interface C P1 , C P2 , C P3 , C P4 , C P5 ; the running state indication module connection end includes interface C Y1 , C Y2 , C Y3 ; The interface C B1 One side of the variable frequency converter is connected to the positive pole of the automatic mode frequency input, and the other side is connected to the interface C K1 The interface C K1 is connected to the positive pole of the automatic mode frequency output of the control system The interface C B2 One side of the variable frequency converter is connected to the negative pole of the automatic mode frequency input, and the other side is connected to the interface C K2 The interface C K2 is connected to the negative pole of the automatic mode frequency output of the control system. The interface C B3 One side is connected with the positive pole of the first frequency feedback output end of the variable frequency converter, and the other side is connected with the interface C K3 Through the interface C K3 The first frequency feedback input positive pole of the control system end is connected The interface C B4 One side is connected with the negative pole of the first frequency feedback output end of the variable frequency converter, and the other side is connected with the interface C K4 Through the interface C K4 The negative pole of the first frequency feedback input end of the control system end is connected. The interface C B7 One side is connected with DC 24V+ of the frequency converter, and the other side is connected with node C Z3 Divided into 3 paths: The first path passes through node C Z2 Connect relay J1 coil side and diode VD1 negative pole, J1 coil other side and VD1 positive pole are connected node C Z1 , C Z1 After connecting the fuse FU1 in series, pass through the interface C B6 Connect the DC 24V- provided by the frequency converter The second road stringing relay J3 opens the switch J 3-1 , through the interface C B5 Connect the frequency converter automatic mode start signal input end; The third path passes through node C Z4 Again, it is divided into two paths, one of which is connected in series with the normally open switch K 1-1 , and then passes through interface C B8 Connect the variable frequency converter manual start signal input; the other is connected in series with the normally open switch K 2-1 , and then passes through interface C B9 Connect the variable frequency converter automatic mode signal input The interface C B10 One side connects the frequency converter manual frequency input, the other side connects the normally open switch K 1-2 The rear connection interface C P1 Through the interface C P1 Connects the frequency setting and feedback module frequency setting value output end; The interface C B11 One side of the frequency converter is connected with DC 10V-, and the other side is connected with the interface C P2 Through the interface C P2 The negative electrode of the frequency setting and feedback module frequency setting signal source is connected The interface C B12 One side of the frequency converter is connected with DC 10V+, and the other side is connected with the interface C P3 The interface C P3 The positive pole of the frequency setting signal source of the frequency setting and feedback module is connected The interface C B13 One side of the connection frequency converter second frequency feedback output positive, the other side of the connection interface C P4 , through the interface C P4 Frequency setting and feedback module second frequency feedback input positive; The interface C B14 One side is connected with the negative pole of the second frequency feedback output end of the variable frequency converter, and the other side is connected with the interface C P5 Through the interface C P5 The frequency setting and feedback module is connected with the negative pole of the second frequency feedback input end The interface C B15 One side is connected with the frequency converter abnormal signal output end, and the other side is connected with the interface C Y1 Through the interface C Y1 The running state indication module is connected with the frequency converter abnormal signal end; The interface C B16 One side is connected to the normal signal output terminal of the frequency converter, and the other side is connected through node C. Z5 It is divided into two paths: the first path connects to interface C. Y2 Through interface C Y2 Connect the inverter's normal signal terminal to the operating status indicator module; after connecting the second circuit with fuse FU2 in series, at node C... Z6 Connect one side of the relay J2 coil to the negative terminal of diode VD2, and connect the other side of the J2 coil to node C. Z7 VD2 positive terminal connection node C Z8 Node C Z7 and C Z8 By shorting with a jumper wire, node C Z8 Connection interface C K7 Through interface C K7 Connect the DC 24V power supply to the control system. The interface C Y3 One side is connected with the running state indication module COM, and the other side is connected with the node C Z7 , and then through the interface C K7 Connect the control system end DC 24V power supply; The interface C B17 One side of the connection frequency converter positive / abnormal indication COM, the other side of the relay J1 normally open switch J 1-1 After, node C Z9 Divided into two ways: the first way through the interface C K8 Connection control system end DC 24V+ power supply; the second way through the node C Z10 Respectively connected to the relay J3 coil one side and diode VD3 negative, J3 coil on the other side and VD3 positive are connected to the node C Z11 , and through the node C Z11 Connection to the collector of the darlington tube DT1, DT1 emitter through the node C Z12 Connect the interface C K7 , and then connect the control system end DC 24V- power supply, DT1 base series potentiometer RP1, fixed resistor R1, through the interface C K9 Connection control system automatic start signal output end; The interface C K5 One end of the frequency converter is connected to the control system value signal end, and the other side is connected to the normally open switch K 2-2 , the relay J2 normally open switch J 2-1 The back end is connected to the interface C K6 , through the interface C K6 The frequency converter is connected to the control system value signal source; The mode selection switch is a knob switch, and the control switch K 1-1 , K 1-2 , K 2-1 , K 2-2 , wherein the switch K 1-1 , K 1-2 is a linkage switch, and both are synchronously opened or closed; the switch K 2-1 , K 2-2 is a linkage switch, and both are synchronously opened or closed.

2. A frequency converter control hub according to claim 1, characterized in that: The mode selection switch has three gears in common. Intermediate position: stop mode, K 1-1 , K 1-2 , K 2-1 , K 2-2 All off; Clockwise rotation position: Manual start, K 1-1 , K 1-2 Closed, K 2-1 , K 2-2 Open; Clockwise rotation position: Auto mode, K 1-1 , K 1-2 Open, K 2-1 , K 2-2 Close.

3. A frequency converter control hub according to claim 1, characterized in that: The control system comprises a DDC controller.

4. The frequency converter control hub of claim 1, wherein: The frequency setting and feedback module comprises a potentiometer and a frequency table, which are used for inputting the frequency requirement of the frequency converter through the potentiometer in the manual mode and displaying the actual output frequency of the frequency converter in the manual and automatic running modes.

5. A frequency converter control hub according to claim 1, characterized in that: The running state indicating module comprises an alarm sound and an indicating lamp, which are used for displaying the state of the frequency converter.

Images