A frequency converter double control system switching module and switching system

Abstract

The application provides a variable frequency converter double control system switching module and a switching system. The switching module is connected with a main control system, an auxiliary control system and a variable frequency converter, and is used for realizing control and feedback signal transmission among the main control system, the auxiliary control system and the variable frequency converter. The switching module selects the main control system or the auxiliary control system to control the variable frequency converter through a control system selection switch, controls whether to connect an external DC 24V power supply to the switching module through the control system selection switch, and then controls the opening and closing states of a plurality of relay switches by using the DC 24V power supply, so as to realize switching of the control system. The switching module comprises a variable frequency converter connection end, a main control system connection end and an auxiliary control system connection end. The application realizes one-key switching of two sets of control systems of the variable frequency converter, and does not need to reconnect the control circuit.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of frequency converter control systems, and particularly relates to a frequency converter double control system switching module and a switching system. BACKGROUND

[0002] In a frequency converter control system, usually only one set of control system is needed for each frequency converter. However, in special cases, the user may need to equip the frequency converter with two or more sets of control systems. For example, as a typical case, the frequency converter is originally equipped with a set of stable control system, but a more advanced control system is introduced for the purpose of improving automation level and reducing energy consumption. In order to ensure that the frequency converter can be used, the user needs to keep the new and old control systems at the same time, and the old system is used as a backup system.

[0003] In the prior art, the frequency converter can only be connected to one set of control system. If the control system needs to be switched, the wiring must be reconnected, which not only complicates the operation and consumes time, but also increases the probability of wiring errors, which seriously affects the user. Therefore, a separate system switching module needs to be designed to realize one-key switching of the new and old control systems and solve the problems caused by repeated wiring. SUMMARY

[0004] Therefore, the application aims to overcome the above problems in the prior art, and provides a frequency converter double control system switching module and a switching system.

[0005] To achieve the above purpose, the technical scheme of the application is as follows:

[0006] A frequency converter double control system switching module, the switching module is connected to a main control system, an auxiliary control system and a frequency converter respectively, and is used to realize the transmission of control and feedback signals between the main control system, the auxiliary control system and the frequency converter. The switching module selects the main control system or the auxiliary control system to control the frequency converter through a control system selection switch, and controls whether to connect an external DC 24V power supply to the switching module through the control system selection switch.

[0007] The switching module includes a frequency converter connection end, a main control system connection end and an auxiliary control system connection end. The frequency converter connection end includes interfaces C B1 , C B2 , C B3 , C B4 , C B5 , C B6 , C B7 , C B8 , C B9 , C B10 , C B11 , CB12 The main control system connection terminal includes interface C. Z1 C Z2 C Z3 C Z4 C Z5 C Z6 C Z7 C Z8 C Z9 C Z10 C Z11 C Z12 C Z13 C Z14 The auxiliary control system connection terminal includes interface C. F1 C F2 C F3 C F4 C F5 C F6 C F7 C F8 C F9 C F10 C F11 C F12 ;

[0008] The external DC 24V power supply is supplied through node C. S1 C S2 Connect J ZD1 ~J ZD8 There are 8 relay coils at both ends; relay J ZD1 ~J ZD8 Parallel connection, relay J ZD1 ~J ZD8 Each piece has 2 sets of contacts, totaling 16 sets of contacts, of which 15 sets of contacts are used. ZD-1 ~J ZD-15 When selecting the main control system, J ZD1 ~J ZD8 When the coil is energized, J ZD-1 ~J ZD-15 Normally open contacts close, normally closed contacts open; when an auxiliary control system is selected, J ZD1 ~J ZD8 Power outage, J ZD-1 ~J ZD-15 Normally closed contacts close, normally open contacts open;

[0009] The interface C B1 One end is connected to the normal operating signal terminal of the frequency converter, and the other end is connected to contact point J. ZD-1 Public terminal, J ZD-1 Normally closed contact connection interface C F1 Through interface C F1Connect the inverter's normal operation signal terminal to the auxiliary control system, and connect the normally open contact to relay J. GZ On one side of the coil, J GZ The other side of the coil passes through node C. S2 Connect to an external DC 24V supply;

[0010] The interface C B2 One end is connected to the inverter's positive / abnormal indicator common terminal (COM terminal), and the other end is connected to contact point J. ZD-2 Public terminal, J ZD-2 Normally open contact through node C S1 Connect to an external DC 24V+, with the normally closed contact at node C. S3 The process is divided into two paths: one path connects to interface C. F2 Through interface C F2 The auxiliary control system inverter's positive / abnormal indicator common terminal is connected, and another path is through J. ZD-15 Normally open contact connects relay J GZ Contact J GZ-1 The public terminal, J GZ-1 Normally open contact through node C S4 With interface C F1 Connection, normally closed contact through node C S5 With interface C F3 connect;

[0011] The interface C B3 One end is connected to the inverter's abnormal operation output terminal, and the other end is connected to contact point J. ZD-3 Public terminal, J ZD-3 Normally closed contact connection interface C F3 Through interface C F3 Connect the auxiliary control system frequency converter abnormal operation signal terminal, J ZD-3 Normally open contacts are not connected to the switching module;

[0012] The interface C B4 One end is connected to the inverter's start terminal, and the other end is connected to contact point J. ZD-4 Public terminal, J ZD-4 Normally closed contact connection interface C F4 Through interface C F4 Connect to the start signal terminal of the auxiliary control system, J ZD-4 Normally open contact connection interface C Z4 Through interface C Z4 Connect to the start signal terminal of the main control system;

[0013] The interface C B5 One end is connected to the inverter's holding signal terminal, and the other end is connected to contact point J. ZD-5 Public terminal, J ZD-5 Normally closed contact connection interface C F5Through interface C F5 Connect to the auxiliary control system to maintain the signal terminal, J ZD-5 Normally open contact connection interface C Z5 Through interface C Z5 Connect the main control system to the signal holding terminal;

[0014] The interface C B6 One end is connected to the positive terminal of the inverter's control frequency input, and the other end is connected to contact point J. ZD-6 Public terminal, J ZD-6 Normally closed contact connection interface C F6 Through interface C F6 Connect the auxiliary control system to the positive terminal of the control frequency output, J ZD-6 Normally open contact connection interface C Z6 Through interface C Z6 Connect to the positive terminal of the main control system's control frequency output;

[0015] The interface C B7 One end is connected to the negative terminal of the inverter's control frequency input, and the other end is connected to contact point J. ZD-7 Public terminal, J ZD-7 Normally closed contact connection interface C F7 Through interface C F7 Connect the auxiliary control system to the positive terminal of the control frequency output, J ZD-7 Normally open contact connection interface C Z7 Through interface C Z7 Connect to the negative terminal of the main control system's control frequency output;

[0016] The interface C B8 One end connects to the inverter's built-in DC 10V+ terminal, and the other end connects to contact point J. ZD-8 Public terminal, J ZD-8 Normally closed contact connection interface C F8 Through interface C F8 Connect to the auxiliary control system to control the DC 10V+ terminal, J ZD-8 Normally open contact connection interface C Z8 Through interface C Z8 Connect to the DC 10V+ terminal of the main control system;

[0017] The interface C B9 One end connects to the inverter's built-in DC 24V+ terminal, and the other end connects to contact point J. ZD-9 Public terminal, J ZD-9 Normally closed contact connection interface C F9 Through interface C F9 Connect to the auxiliary control system to control the DC 24V+ terminal, J ZD-9 Normally open contact connection interface C Z9 Through interface CZ9 Connect to the DC 24V+ terminal of the main control system;

[0018] The interface C B10 One end connects to the inverter's built-in DC 24V terminal, and the other end connects to contact point J. ZD-10 Public terminal, J ZD-10 Normally closed contact connection interface C F10 Through interface C F10 Connect to the auxiliary control system control DC 24V terminal, J ZD-10 Normally open contact connection interface C Z10 Through interface C Z10 Connect to the DC 24V terminal of the main control system;

[0019] The interface C B11 One end is connected to the positive terminal of the frequency feedback output of the frequency converter, and the other end is connected to contact point J. ZD-11 Public terminal, J ZD-11 The normally closed contact is at node C. S6 The process is divided into two paths: one path connects to interface C. F11 Through interface C F11 The positive terminal of the frequency feedback input of the auxiliary control system is connected, and the other path is through J. ZD-13 Normally open contact connection interface C Z13 Through interface C Z13 Connect to the positive terminal of the frequency feedback output of the main control system, J ZD-11 Normally open contact connection interface C Z11 Through interface C Z11 Connect the positive terminal of the frequency feedback input of the main control system; wherein, the positive terminal of the frequency feedback output of the main control system is connected to the positive terminal of the secondary signal of the signal transmitter in the main control system, and the positive terminal of the frequency feedback input of the main control system is connected to the positive terminal of the primary signal of the signal transmitter in the main control system.

[0020] The interface C B12 One end is connected to the negative terminal of the frequency feedback output of the frequency converter, and the other end is connected to contact point J. ZD-12 Public terminal, J ZD-12 The normally closed contact is at node C. S7 The process is divided into two paths: one path connects to interface C. F12 Through interface C F12 The negative terminal of the frequency feedback input of the auxiliary control system is connected, and the other path is through J. ZD-14 Normally open contact connection interface C Z14 Through interface C Z14 Connect to the negative terminal of the frequency feedback output of the main control system, J ZD-12 Normally open contact connection interface C Z12 Through interface C Z12Connect the negative terminal of the frequency feedback input of the main control system; wherein, the negative terminal of the frequency feedback output of the main control system is connected to the negative terminal of the secondary signal of the signal transmitter in the main control system, and the negative terminal of the frequency feedback input of the main control system is connected to the negative terminal of the primary signal of the signal transmitter in the main control system.

[0021] The main control system inverter positive / abnormal indication common terminal (COM terminal) is connected via interface C. Z3 Connecting relay J GZ Contact J GZ-2 Public terminal, J GZ-2 Normally closed contacts are connected through interface C. Z2 Connect the inverter's abnormal signal interface to the main control system. The normally open contact is connected through interface C. Z1 Connect to the normal signal interface of the frequency converter in the main control system.

[0022] Furthermore, the control system selection switch includes a switch button or a knob.

[0023] The present invention also provides a frequency converter dual control system switching system, including the above-mentioned dual control system switching module and a frequency converter, a main control system, an auxiliary control system, and a control system selection switch connected to the dual control system switching module.

[0024] Compared with existing technologies, the inverter dual control system switching module and switching system described in this invention have the following advantages:

[0025] 1. This invention enables one-click switching between two control systems of a frequency converter, eliminating the need for rewiring;

[0026] 2. This invention enables the auxiliary control system to normally receive frequency feedback signals and positive / abnormal feedback signals from the frequency converter when the main control system is used to control the frequency converter, thus playing a monitoring role.

[0027] 3. This invention creates two control systems with interlocking functions at the input terminals of the inverter control signals, ensuring that the inverter can only receive signals from one control system and that the signal outputs of the two control systems do not affect each other.

[0028] 4. The frequency converter created by this invention has a signal isolation function for the output signals of the two control systems, so that the signal input terminals of the two control systems do not affect each other.

[0029] 5. The DC 24V control power supply required for this invention is a common standard control power supply for control systems, which facilitates construction;

[0030] 6. The number and types of interfaces created by this invention meet the control requirements of most frequency converters, and the module structure is simple, easy to expand, and has the potential to support more signal interfaces. Attached Figure Description

[0031] 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:

[0032] Figure 1 A schematic diagram illustrating the principle of a frequency converter dual control system switching module created by the present invention;

[0033] Figure 2 This is a schematic diagram of a frequency converter dual control system switching system created by the present invention. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0035] 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.

[0036] 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.

[0037] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] This invention provides a dual-control system switching module for a frequency converter. The module connects to the main control system, auxiliary control system, and frequency converter, respectively, enabling necessary control and feedback signal transmission among the three. Simultaneously, a system switching signal is input via a control system selection switch. It should be noted that the main control system, auxiliary control system, frequency converter, and control system selection switch used in this invention are all existing products commonly used in the field.

[0039] like Figure 1 As shown, the switching module includes an inverter connection terminal, a main control system connection terminal, and an auxiliary control system connection terminal mounted on a circuit board. The inverter connection terminal includes an 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 The main control system connection terminal includes interface C. Z1 C Z2 C Z3 C Z4 C Z5 C Z6 C Z7 C Z8 C Z9 C Z10 C Z11 C Z12 C Z13 C Z14 The auxiliary control system connection terminal includes interface C. F1 C F2 C F3 C F4 C F5 C F6 C F7 C F8 C F9 C F10 C F11 C F12 .

[0040] In one embodiment, the control system selector switch uses switch K1 to select whether to use the main system or the auxiliary system to control the frequency converter. When the main system control is selected, K1 is closed, and the central control connects the positive and negative terminals of the external DC 24V power supply to the switching module respectively; when the auxiliary control system is selected, K1 is open, and the external DC 24V power supply is not connected to the switching module.

[0041] The aforementioned external DC 24V power supply is supplied through node C. S1 C S2 Connect J ZD1 ~J ZD8 There are 8 relay coils at both ends.

[0042] The above relay J ZD1 ~J ZD8 Each piece has 2 sets of contacts, for a total of 16 sets of contacts. This invention utilizes 15 sets of contacts, namely J. ZD-1 ~J ZD-15 Because J ZD1 ~J ZD8 Since they are connected in parallel, all their contacts open and close synchronously. Therefore, the specific correspondence between the above 8 relays and 15 sets of contacts is not limited and can be freely adjusted according to factors such as the needs of circuit board design.

[0043] When selecting the main control system, J ZD1 ~J ZD8 When the coil is energized, J ZD-1 ~J ZD-15 Normally open contacts close, normally closed contacts open; when an auxiliary control system is selected, J ZD1 ~J ZD8 Power outage, J ZD-1 ~J ZD-15 Normally closed contacts close, normally open contacts open.

[0044] In one embodiment, interface C B1 One end is connected to the normal operating signal terminal of the frequency converter, and the other end is connected to contact point J. ZD-1 Public terminal, J ZD-1 Normally closed contact connection interface C F1 Through interface C F1 Connect the inverter's normal operation signal terminal to the auxiliary control system, and connect the normally open contact to relay J. GZ On one side of the coil, J GZ The other side of the coil passes through node C. S2 Connect to external DC 24V;

[0045] Interface C B2 One end is connected to the inverter's positive / abnormal indicator common terminal (COM terminal), and the other end is connected to contact point J. ZD-2 Public terminal, J ZD-2 Normally open contact through node C S1 Connect to an external DC 24V+, with the normally closed contact at node C. S3 The process is divided into two paths: one path connects to interface C. F2 Through interface C F2The auxiliary control system inverter's positive / abnormal indicator common terminal is connected, and another path is through J. ZD-15 Normally open contact connects relay J GZ Contact J GZ-1 The public terminal, J GZ-1 Normally open contact through node C S4 With interface C F1 Connection, normally closed contact through node C S5 With interface C F3 connect;

[0046] Interface C B3 One end is connected to the inverter's abnormal operation output terminal, and the other end is connected to contact point J. ZD-3 Public terminal, J ZD-3 Normally closed contact connection interface C F3 Through interface C F3 Connect the auxiliary control system frequency converter abnormal operation signal terminal, J ZD-3 Normally open contacts are not connected to the switching module;

[0047] The main control system inverter positive / abnormal indication common terminal (COM terminal) is connected via interface C. Z3 Connecting relay J GZ Contact J GZ-2 Public terminal, J GZ-2 Normally closed contacts are connected through interface C. Z2 Connect the inverter's abnormal signal interface to the main control system. The normally open contact is connected through interface C. Z1 Connect the normal signal terminal of the inverter in the main control system;

[0048] When using it, select the main control system to run, J ZD-1 J ZD-2 J ZD-3 J ZD-15 Normally open contacts are closed, and normally closed contacts are open.

[0049] When the frequency converter determines that it is operating normally, it internally connects the COM terminal to the normal operation signal output terminal, i.e., interface C. B1 C B2 Connected inside the frequency converter, thus enabling J GZ When the coil is connected to an external DC 24V power supply, J GZ-1 J GZ-2 The normally closed contact opens, and the normally open contact closes. At this time, the main control system COM terminal signal is transmitted through interface C. Z3 J GZ-2 Normally open contact, interface C Z1 It connects to the inverter's normal signal interface, while the auxiliary control system's COM terminal signal is transmitted through interface C. F2 Node C S3 J ZD-15 JGZ-1 Normally open contact, node C S4 Interface C F1 Connect it to the normal signal interface of its frequency converter.

[0050] When the frequency converter detects an operational malfunction, it internally connects the COM terminal of the frequency converter to the operational malfunction signal output terminal. GZ When the coil is de-energized, J GZ-1 J GZ-2 The normally closed contact is closed, and the normally open contact is open. At this time, the main control system COM terminal signal is transmitted through interface C. Z3 J GZ-2 Normally closed contact, interface C Z2 It connects to the inverter's fault signal interface, while the auxiliary control system's COM terminal signal is transmitted through interface C. F2 Node C S3 J ZD-15 J GZ-1 Normally closed contact, node C S5 Interface C F3 Connect to its inverter's abnormal signal interface.

[0051] When selecting the auxiliary control system for operation, J ZD-1 J ZD-2 J ZD-3 J ZD-15 Normally closed contacts are closed, and normally open contacts are open.

[0052] At this time, the inverter signal passes through interface C. B1 C B2 C B3 Connect directly to interface C respectively F1 C F2 C F3 Then, it connects to the corresponding interface of the auxiliary control system. Based on its own operating status, the frequency converter internally connects its COM terminal to either normal or abnormal mode, sending the corresponding signal to the auxiliary control system.

[0053] It should be noted that the auxiliary control system, as a backup system, generally only plays a control role when the main control system malfunctions. Therefore, when switching to the auxiliary control system, there is no need to report the inverter's operating status to the main control system. However, when switching to the main control system, the switching module described in this invention retains the function of the auxiliary system in reading the positive / abnormal status of the inverter, allowing users to read the inverter feedback signals simultaneously in both systems.

[0054] Furthermore, as can be seen from the above operating mode, the positive / abnormal indication feedback signals of the main and auxiliary control systems are independent of each other, and the lines do not cross, thus achieving isolation of the inverter feedback signals of the main and auxiliary control systems.

[0055] In one embodiment, the positive terminal of the inverter frequency feedback output is connected to interface C. B11 Connect J ZD-11 Public terminal, J ZD-11 Normally closed contact via interface C F11 The frequency feedback input positive terminal of the auxiliary control system is connected, and the normally open contact is connected through interface C. Z11 Connect to the main control system, and connect the primary signal positive terminal of the signal transmitter within the main control system.

[0056] The frequency feedback output negative terminal of the inverter is connected to interface C. B12 Connect J ZD-12 Public terminal, J ZD-12 Normally closed contacts are connected through interface C. F12 The frequency feedback input negative terminal of the auxiliary control system is connected, and the normally open contact is connected through interface C. Z12 Connect to the main control system, and connect the negative terminal of the primary signal of the signal transmitter within the main control system.

[0057] The positive terminal of the secondary signal of the signal transmitter is connected to interface C. Z13 Connect J ZD-13 On one side, J ZD-13 The other side passes through node C S6 With interface C F11 Connection. The negative terminal of the secondary signal of the signal transmitter is connected via interface C. Z14 Connect J ZD-14 On one side, J ZD-14 The other side passes through node C S7 With interface C F12 connect.

[0058] When using it, select the main control system to run, J ZD-11 J ZD-12 J ZD-13 J ZD-14 Normally open contacts are closed, and normally closed contacts are open.

[0059] At this time, the inverter outputs a positive frequency signal through interface C. B11 J ZD-11 Normally open contact, interface C Z11 The primary signal of the signal transmitter input to the main control system is positive, and the negative signal is transmitted through interface C. B12 J ZD-12 Normally open contact, interface C Z12 The signal transmitter inputs the negative primary signal to the main control system. The signal transmitter then outputs the positive secondary frequency feedback signal via interface C. Z13 J ZD-13 Node C S6 Interface C F11 The positive terminal of the frequency feedback input to the auxiliary control system is connected, and the negative terminal is connected via interface C. Z14J ZD-14 Node C S7 Interface C F12 The signal transmitter connects to the negative terminal of the frequency feedback input of the auxiliary control system. Furthermore, it sends at least one secondary signal to the internal interface of the main control system for its own use. In other words, the signal transmitter provides frequency feedback signals to both the main and auxiliary control systems simultaneously. Since the connection lines between the main control system and the secondary signal are not part of the switching module described in this invention, they will not be described in detail here.

[0060] When selecting the auxiliary control system for operation, J ZD-11 J ZD-12 J ZD-13 J ZD-14 The normally open contact opens, and the normally closed contact closes. At this time, the inverter's frequency output positive signal passes through interface C. B11 J ZD-11 Normally closed contact, interface C F11 Directly connect to the corresponding interface of the auxiliary control system; the negative signal passes through interface C. B12 J ZD-12 Normally closed contact, interface C F12 It connects directly to the corresponding interface of the auxiliary control system. The main control system does not receive frequency feedback signals.

[0061] Similar to the inverter's positive / abnormal indicator circuit, when switching to the auxiliary control system, the switching module does not feed back the inverter frequency to the main control system. However, when running under the main control system, the auxiliary system retains the function of reading the inverter frequency feedback signal.

[0062] Furthermore, as can be seen from the schematic diagram, the frequency feedback signals of the inverters in the main and auxiliary control systems are independent of each other, and the lines do not cross, thus achieving signal isolation.

[0063] In one embodiment, the signals from the seven interfaces of the frequency converter—start, hold, control frequency input positive, control frequency input negative, built-in DC 10V+, built-in DC 24V+, and built-in DC 24V-—are transmitted through interface C. B4 ~C B10 Access the switching module and connect to J respectively. ZD-4 ~J ZD-10 Public terminal. J ZD-4 ~J ZD-10 The normally closed contacts connect the above signals to interface C respectively. F4 ~C F10 Then connect it to the corresponding port of the auxiliary control system; J ZD-4 ~J ZD-10 The normally open contacts connect the above signals to interface C respectively. Z4 ~C Z10 Then connect it to the corresponding interface of the main control system.

[0064] When using it, select the main control system to run, J ZD-4 ~J ZD-10 When the normally open contact closes and the normally closed contact opens, the signal flows from interface C. B4 ~C B10 Connect to interface C respectively Z4 ~C Z10 When connected to the main control system, the corresponding interface C of the auxiliary control system... F4 ~C F10 There is no signal transmission between the inverter and the frequency converter.

[0065] When selecting the auxiliary control system for operation, J ZD-4 ~J ZD-10 The normally open contact opens, the normally closed contact closes, and the signal flows from interface C. B4 ~C B10 Connect to interface C respectively F4 ~C F10 When connected to the auxiliary control system, the corresponding interface C of the main control system... Z4 ~C Z10 There is no signal transmission between the inverter and the frequency converter.

[0066] It is evident that the main and auxiliary control systems are completely isolated from the control signals of the frequency converter and do not affect each other.

[0067] It should be noted that this disclosure does not limit the specific number, function, or arrangement order of the aforementioned through-line circuits. The seven sets of interface functions were selected because these seven sets of interfaces transmit the most commonly used control signals of the frequency converter, which usually fully meets the control requirements of the frequency converter. Furthermore, this specific description facilitates a thorough understanding of the design intent by those skilled in the art. If the interface functions need to be changed, simply modify the wiring between the frequency converter and the control system accordingly. If the frequency converter requires more lines to transmit control signals, this can be achieved by adding relays connected in parallel in the switching circuit, such as adding parallel J relays. ZD9 J ZD10 The number of lines can be increased accordingly in the switching module. When the inverter requires fewer than 7 control interfaces, such as a two-wire start inverter that does not need to maintain interfaces, the corresponding interfaces can simply be left unused and not connected to the inverter and control system.

[0068] like Figure 2 As shown, the present invention also provides a frequency converter dual control system switching system, including the above-mentioned dual control system switching module and a frequency converter, a main control system, an auxiliary control system, and a control system selection switch connected to the dual control system switching module.

[0069] 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 variable frequency drive dual control system switching module, characterized in that: The switching module comprises a frequency converter connection end, a main control system connection end and an auxiliary control system connection end, the frequency converter connection end comprises an interface C B1 -C B12 , the main control system connection end comprises an interface C Z1 -C Z14 , and the auxiliary control system connection end comprises an interface C F1 -C F12 . External DC 24V power supply through node C S1 , C S2 Connection J ZD1 ~ J ZD8 Both ends of the coil of 8 relays; relay J ZD1 ~ J ZD8 In parallel, relay J ZD1 ~ J ZD8 Each has 2 sets of contacts, a total of 16 sets of contacts, using 15 sets of contacts J ZD-1 ~ J ZD-15 ; when the main control system is selected, J ZD1 ~ J ZD8 The coil is energized, J ZD-1 ~ J ZD-15 The normally open contact is closed, and the normally closed contact is open; when the auxiliary control system is selected, J ZD1 ~ J ZD8 De-energized, J ZD-1 ~ J ZD-15 The normally closed contact is closed, and the normally open contact is open; Interface C B4 One end connects the frequency converter starting end, the other end connects the contact J ZD-4 Common end, J ZD-4 Normally closed contact connects interface C F4 , through interface C F4 Connects the auxiliary control system starting signal end, J ZD-4 Normally open contact connects interface C Z4 , through interface C Z4 Connects the main control system starting signal end; Interface C B6 One end connects the frequency input positive of the frequency converter control, the other end connects the contact J ZD-6 Common end, J ZD-6 Normally closed contact connects interface C F6 , through interface C F6 Connect the frequency output positive of the auxiliary control system control, J ZD-6 Normally open contact connects interface C Z6 , through interface C Z6 Connect the frequency output positive of the main control system control; Interface C B7 One end connects the frequency input negative of the frequency converter control, the other end connects the contact J ZD-7 Common end, J ZD-7 Normally closed contact connects interface C F7 , through interface C F7 Connect the frequency output positive of the auxiliary control system control, J ZD-7 Normally open contact connects interface C Z7 , through interface C Z7 Connect the frequency output negative of the main control system control; Interface C B11 One end connects the frequency feedback output positive of the frequency converter, and the other end connects the contact J ZD-11 Common end, J ZD-11 The normally closed contact is divided into two ways at node C S6 One way connects the interface C F11 , and the other way connects the frequency feedback input positive of the auxiliary control system through the interface C F11 The normally open contact connects the interface C ZD-13 , and the other way connects the frequency feedback output positive of the main control system through the interface C Z13 The normally open contact connects the interface C Z13 , and the other way connects the frequency feedback input positive of the main control system through the interface C ZD-11 The normally open contact connects the interface C Z11 , and the other way connects the frequency feedback input positive of the main control system through the interface C Z11 ; wherein, the frequency feedback output positive of the main control system connects the secondary signal positive of the signal transmitter in the main control system, and the frequency feedback input positive of the main control system connects the primary signal positive of the signal transmitter in the main control system; Interface C B12 One end connects the frequency feedback output negative pole of the frequency converter, and the other end connects contact J ZD-12 Common end, J ZD-12 The normally closed contact is divided into two ways at node C S7 One way connects interface C F12 , and the other way connects the frequency feedback input negative pole of the auxiliary control system through interface C F12 The normally open contact connects interface C ZD-14 , and the other way connects the frequency feedback output negative pole of the main control system through interface C Z14 The normally open contact connects interface C Z14 , and the other way connects the frequency feedback input negative pole of the main control system through interface C ZD-12 The normally open contact connects interface C Z12 , and the other way connects the frequency feedback input negative pole of the main control system through interface C Z12 ; wherein, the frequency feedback output negative pole of the main control system is connected to the secondary signal negative pole of the signal transmitter in the main control system, and the frequency feedback input negative pole of the main control system is connected to the primary signal negative pole of the signal transmitter in the main control system.

2. The dual control system switching module of claim 1, wherein: the control system selection switch comprises a push button or a knob.

3. The dual control system switching module of claim 1, wherein: Interface C B1 One end connects the frequency converter running normal signal end, the other end connects the contact J ZD-1 Common end, J ZD-1 Normally closed contact connects interface C F1 , through interface C F1 Connect the auxiliary control system frequency converter running normal signal end, normally open contact connects relay J GZ Coil side, J GZ The other side of the coil passes through node C S2 Connect external DC 24V- 4. The dual control system switching module of claim 1, wherein: Interface C B2 One end connects the frequency converter positive / abnormal indication common end, the other end connects the contact J ZD-2 Common end, J ZD-2 Normally open contact passes through node C S1 Connect external DC 24V+, normally closed contact at node C S3 Divided into two ways: one way connects interface C F2 , through interface C F2 Connect the auxiliary control system frequency converter positive / abnormal indication common end, the other way through J ZD-15 Normally open contact connects relay J GZ Contact J GZ-1 Common end, J GZ-1 Normally open contact passes through node C S4 With interface C F1 Connect, normally closed contact passes through node C S5 With interface C F3 Connect.

5. The dual control system switching module of claim 1, wherein: Interface C B3 One end connects the frequency converter operation abnormal output, the other end connects the contact J ZD-3 Common end, J ZD-3 Normally closed contact connects interface C F3 , through interface C F3 Connect the auxiliary control system frequency converter operation abnormal signal end, J ZD-3 Normally open contact does not access the switching module.

6. The dual control system switching module of claim 1, wherein: Interface C B5 One end connects to the frequency converter hold signal terminal, the other end connects to contact J ZD-5 Common terminal, J ZD-5 Normally closed contact connects interface C F5 Through interface C F5 Connects to the auxiliary control system hold signal terminal, J ZD-5 Normally open contact connects interface C Z5 Through interface C Z5 Connects to the main control system hold signal terminal.

7. The dual control system switching module of claim 1, wherein: Interface C B8 One end connects the frequency converter with DC 10V+ end, the other end connects contact J ZD-8 Common end, J ZD-8 Normally closed contact connects interface C F8 Through interface C F8 Connect auxiliary control system control DC 10V+ end, J ZD-8 Normally open contact connects interface C Z8 Through interface C Z8 Connect main control system DC 10V+ end.

8. The dual control system switching module of claim 1, wherein: Interface C B9 One end connects the frequency converter with DC 24V+ end, the other end connects contact J ZD-9 Common end, J ZD-9 Normally closed contact connects interface C F9 Through interface C F9 Connects the auxiliary control system control DC 24V+ end, J ZD-9 Normally open contact connects interface C Z9 Through interface C Z9 Connects the main control system DC 24V+ end; interface C B10 One end connects the frequency converter with DC 24V- end, the other end connects contact J ZD-10 Common end, J ZD-10 Normally closed contact connects interface C F10 Through interface C F10 Connects the auxiliary control system control DC 24V- end, J ZD-10 Normally open contact connects interface C Z10 Through interface C Z10 Connects the main control system DC 24V- end.

9. The dual control system switching module of claim 1, wherein: Main control system frequency converter normal / abnormal indication common through interface C Z3 Connection relay J GZ Contact J GZ-2 Common, J GZ-2 Normally closed contact through interface C Z2 Connection main control system frequency converter abnormal signal interface, normally open contact through interface C Z1 Connection main control system frequency converter normal signal interface.

10. A variable frequency drive dual control system switching system, characterized by: including the dual control system switching module according to any one of claims 1-9, and a variable frequency drive, a main control system, an auxiliary control system, and a control system selection switch connected with the dual control system switching module.

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