Control cabinet button switch control module and method

Abstract

The invention relates to the technical field of control, in particular to a button switch control module and method for a control cabinet, and the module comprises a normally-open and normally-closed relay, at least two relays, and a control unit which is used for controlling the opening and closing of the relays. The normally-open and normally-closed relay is externally provided with two interfaces, the two interfaces are in a conducting state through a normally-closed contact in an initial state, at least two relays are respectively externally provided with an interface, and the relays are respectively connected with normally-open contacts of the normally-open and normally-closed relay through normally-open contacts of the relays; a control source change-over switch is arranged between the power supply and communication interface and the control unit so as to control the opening and closing of the normally open and normally closed relay; according to the control module access scheme, common buttons and knobs of the cabinet door of the control cabinet are included, the control source change-over switch is arranged so that it can be guaranteed that the control authority can be rapidly switched in the abnormal state, and the field safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of control technology, and in particular to a control cabinet push-button switch control module and method. Background Technology

[0002] In HVAC equipment room renovation projects, it is necessary to connect the control cabinets of various HVAC equipment to a group control system. However, due to changes in on-site usage requirements and equipment upgrades, the control cabinets often undergo multiple modifications and adjustments. After these modifications, the actual wiring layout inside the control cabinets often differs significantly from the original design drawings, requiring professional electrical personnel to re-trace the wiring and provide an integration solution. This poses a significant challenge to integrating the new system and fails to meet the need for rapid on-site response. To address this, a method of quickly connecting the control system via cabinet door toggle switches (buttons, knobs) can be adopted, avoiding the tedious process of re-wiring.

[0003] However, the aforementioned direct access method poses a security risk. This method directly deprives the original buttons and knobs on the control cabinet door of their control functions, completely transferring control to the newly added control system. When the new system malfunctions, the original button and knob control functions on the control cabinet door will become completely ineffective, making emergency control of field equipment impossible, severely impacting the normal operation of the group control site, and potentially even causing a safety accident. Summary of the Invention

[0004] The purpose of this invention is to provide a control module and method for a control cabinet push-button switch, thereby solving the problems existing in the prior art. To achieve the above objective, this invention provides the following technical solution:

[0005] In a first aspect, the present invention provides a control cabinet push-button switch control module, including a normally open and normally closed relay, at least two relays, and a control unit. The control unit is used to control the opening and closing of the relays. The normally open and normally closed relays have two external interfaces, and in the initial state, the two interfaces are connected through normally closed contacts. The at least two relays each have one external interface, and the relays are connected to the normally open contacts of the normally open and normally closed relays through their normally open contacts. The invention also includes a power supply and a communication interface, and a control source switching switch is provided between the power supply and the control unit to control the opening and closing of the normally open and normally closed relays.

[0006] As a further technical solution, the relay also has normally closed contacts, wherein the normally closed contacts of one relay are connected in series with the coils of the other relays respectively, and the normally closed contacts of the relay are initially in a closed state and the relay coils and the control unit are in an energized state.

[0007] Secondly, the present invention provides a control cabinet push-button switch control module, including at least one normally open relay K1, at least one normally closed relay K2, and a control unit. The control unit is used to control the opening and closing of the normally open relay K1 and the normally closed relay K2. The normally open relay K1 and the normally closed relay K2 each have two interfaces for connecting to the push-button switch. It is also provided with a power supply and communication interface, and a control source switching switch is provided between the power supply and the control unit to control the start and stop of the control unit.

[0008] As a further technical solution, the control unit is a microcontroller unit.

[0009] As a further technical solution, the power supply and communication interface communicate with the upper-level group control system based on the Homebus communication protocol.

[0010] Thirdly, the present invention provides a method for operating a control cabinet push-button switch control module as described in the first aspect, comprising the following steps:

[0011] When connecting to the control, disconnect the circuit at the input terminal of the knob, connect the power supply to one interface of the normally closed contact of the normally open and normally closed relay, and connect the other interface to the input terminal of the knob; the normally open contacts of the relay are connected to multiple output terminals of the knob respectively.

[0012] Rotating the control source switch energizes the normally open and normally closed relays, and current flows to the normally open contacts of the relays. At this time, the corresponding circuit can be controlled by the control unit and the relays. Rotating the control source switch de-energizes the normally open and normally closed relays, and the relays and their contacts are in the default state. At this time, the equipment can be controlled by the knob.

[0013] Fourthly, the present invention provides a method for operating a control module based on a control cabinet push-button switch as described in the second aspect, comprising the following steps:

[0014] When connecting the control module, connect the normally open relay K1 in parallel with the start button of the control cabinet, and connect the normally closed relay K2 in series with the stop button of the control cabinet.

[0015] Rotating the control source switch energizes the control unit and normally open relays K1 and K2, allowing the control unit to control the operation of normally open relays K1 and K2, thereby starting or stopping the equipment. Rotating the control source switch de-energizes the control unit and normally open relays K1 and K2, keeping normally open relay K1 open and normally closed relay K2 closed. The equipment can then be started or stopped using the control cabinet door button.

[0016] The beneficial effects of the present invention are as follows:

[0017] (1) The present invention provides a control module for control cabinet knob access control, which is equipped with normally open and normally closed relays, at least two relays and control unit. The relays and normally open and normally closed relays are used to connect external knobs, and a control source switching switch is set to switch the control of the knob on site or remote control through the control unit. In case of abnormality, the control authority can be quickly switched to ensure the safety of the site.

[0018] (2) The present invention also provides a control module for control cabinet button access control, which is equipped with normally open relays, normally closed relays and control unit. The normally open relays and normally closed relays are used for external button connection, and a control source switching switch is set to switch on-site knob control or remote control through control unit. In case of abnormality, the control authority can be quickly switched to ensure on-site safety.

[0019] (3) The control module access scheme provided by the present invention includes common buttons and knobs on the control cabinet door, which are applicable to most control sites; and there is no need to consider the modification of the wiring inside the cabinet. As long as the control cabinet door buttons and knobs can be used normally, they can be quickly connected. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute a limitation thereof. It should also be understood that these drawings are for simplicity and clarity and are not necessarily drawn to scale. The invention will now be described and explained with additional features and details using the drawings, wherein:

[0021] Figure 1 A schematic diagram of a control cabinet push-button switch control module is shown in an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of another control cabinet push-button switch control module is shown in an embodiment of the present invention. Detailed Implementation

[0023] The technical solutions in typical embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0024] Example 1

[0025] like Figure 2 As shown, this embodiment provides a control module for a control cabinet rotary switch, including a normally open and normally closed relay K3, at least two relays, and a control unit. The control unit is used to control the opening and closing of the relays. This embodiment is for a three-position rotary switch, which has two output interfaces. Therefore, this embodiment uses two relays, namely relay K1 and relay K2. It can be understood that the number of relays should be greater than or equal to the number of output interfaces of the rotary switch.

[0026] Normally open and normally closed relay K3 has two external interfaces (interface ① and interface ②), and in the initial state, the two interfaces are connected through normally closed contacts. Relay K1 has an external interface ③, and relay K2 has an external interface ④. Relays K1 and K2 are connected to the normally open contacts of normally open and normally closed relay K3 through their normally open contacts. It is also equipped with power supply and communication interfaces, and a control source switching switch is provided between it and the control unit to control the opening and closing of normally open and normally closed relays.

[0027] Relays K1 and K2 also have normally closed contacts. The normally closed contacts of one relay are connected in series with the corresponding coils of the other relays. Specifically, a set of normally closed contacts of relay K1 is connected in series with the coil of relay K2, and a set of normally closed contacts of relay K2 is connected in series with the coil of relay K1. This ensures that only one of relays K1 and K2 can operate at a time, preventing them from operating simultaneously and achieving interlocking. Furthermore, the normally closed contacts of the relays are initially in a closed state, and the relay coils and control unit are energized.

[0028] When connecting to the control, the original input circuit of the knob needs to be disconnected. Connect the power supply to interface ① of the control module, interface ② of the control module to pins 1 and 3 of the knob, and pins 2 and 4 of the knob to interfaces ③ and ④ of the control module respectively. A set of normally open and normally closed contacts of normally open relay K3 is used to control the switching of power. In the default state, current flows to the knob, and the corresponding circuit can be controlled by the knob. When normally open and normally closed relay K3 is activated, current flows to the normally open contacts of internal relays K1 and K2. The corresponding circuit can then be controlled by relays K1 and K2. Furthermore, relays K1 and K2 have an interlocking design. Connecting a set of normally closed contacts of relay K1 in series with the coil of relay K2, and connecting a set of normally closed contacts of relay K2 in series with the coil of relay K1, ensures that only one of relays K1 and K2 can operate at a time; both will not operate simultaneously.

[0029] The control module has a set of control source switching interfaces AB, which are used to install a control source switching switch. This switch controls whether the coil of normally open and normally closed relay K3 is energized. When AB is disconnected, normally open and normally closed relay K3 is not energized, and the contacts are in the default state, at which time the knob is controllable. When AB is closed, normally open and normally closed relay K3 is energized, and the normally open contacts of normally open and normally closed relay K3 are closed, and the control module takes effect.

[0030] In this embodiment, the control unit is a microcontroller unit (MCU). Additionally, the power supply and communication interface communicate with the upper-level group control system based on the Homebus communication protocol.

[0031] The control module provided in this embodiment for controlling the knob access of the control cabinet is equipped with normally open and normally closed relays, at least two relays, and a control unit. The relays and normally open and normally closed relays are used to connect external knobs, and a control source switching switch is set to switch between on-site knob control and remote control through the control unit. In case of abnormality, the control authority can be quickly switched to ensure on-site safety.

[0032] Example 2

[0033] This invention provides a method for operating a control module based on a control cabinet push-button switch as described in Embodiment 1, comprising the following steps:

[0034] When connecting to the control, disconnect the circuit at the input terminal of the knob, connect the power supply to one interface of the normally closed contact of the normally open and normally closed relay K3, and connect the other interface to the input terminal of the knob; the normally open contacts of the relay are connected to multiple output terminals of the knob; specifically, connect the power supply to interface ① of the control module, connect interface ② of the control module to pins 1 and 3 of the knob, and connect pins 2 and 4 of the knob to interfaces ③ and ④ of the control module respectively.

[0035] Rotating the control source switch energizes the normally open and normally closed relays, allowing current to flow to their normally open contacts. At this time, the corresponding circuit can be controlled via the control unit and the relays. Rotating the control source switch de-energizes the normally open and normally closed relays, placing the relays and their contacts in their default state. The device can then be controlled via a knob. Specifically, a set of normally open and normally closed contacts of normally open and normally closed relay K3 is used to control power switching. In the default state, current flows to the knob, allowing control of the corresponding circuit. When normally open and normally closed relay K3 is activated, current flows to the normally open contacts of internal relays K1 and K2, allowing control of the corresponding circuit via relays K1 and K2.

[0036] Example 3

[0037] like Figure 1 As shown, this embodiment provides a control cabinet push-button switch control module, including at least one normally open relay K1, at least one normally closed relay K2, and a control unit. The control unit is used to control the opening and closing of the normally open relay K1 and the normally closed relay K2. The normally open relay K1 and the normally closed relay K2 each have two interfaces for connecting to the push-button switch. In this embodiment, one normally open relay K1 and one normally closed relay K2 are provided. It also has a power supply and communication interface, and a control source switching switch is provided between the interface and the control unit to control the start and stop of the control unit.

[0038] The control module has an interface AB for switching the control source, which is used to install the control source switching switch. One end of this interface is the positive terminal of the internal power supply (taking 24V+ as an example), and the other end is the common terminal of the coils of two relays (K1, K2) inside the control module. The relays can only be controlled when AB is shorted. When AB is disconnected, the two relays will be in a de-energized state and will not be controlled by the control unit. At this time, the normally open relay K1 will always remain open and the normally closed relay K2 will always remain closed. This will not affect the use of the control button, and the device can be started and stopped normally by the button.

[0039] When connecting the control module, connect the normally open relay K1 in parallel with the control cabinet start button, and connect the normally closed relay K2 in series with the control cabinet stop button. This allows the system to simulate the effect of pressing the start button when the normally open relay K1 is closed, thus starting the equipment; and to simulate the effect of pressing the stop button when the normally closed relay K2 is open, thus stopping the equipment.

[0040] In this embodiment, the control unit is a microcontroller unit (MCU). Additionally, the power supply and communication interface communicate with the upper-level group control system based on the Homebus communication protocol.

[0041] The control module provided in this embodiment for control cabinet button access control is equipped with normally open relays, normally closed relays and control units. The normally open relays and normally closed relays are used to connect external buttons, and a control source switching switch is set to switch between on-site knob control or remote control through the control unit. In case of abnormality, the control authority can be quickly switched to ensure on-site safety.

[0042] Example 4

[0043] This embodiment provides a method for operating the control module of the control cabinet push-button switch as described in Embodiment 3, including the following steps:

[0044] When connecting the control module, connect the normally open relay K1 in parallel with the start button of the control cabinet, and connect the normally closed relay K2 in series with the stop button of the control cabinet.

[0045] Rotating the control source switch energizes the control unit and normally open relays K1 and K2, allowing the control unit to control the operation of normally open relays K1 and K2, thereby starting or stopping the equipment. Rotating the control source switch de-energizes the control unit and normally open relays K1 and K2, keeping normally open relay K1 open and normally closed relay K2 closed. The equipment can then be started or stopped using the control cabinet door button.

[0046] Example 5

[0047] This embodiment provides a control cabinet toggle switch control module, including a control cabinet toggle switch control module provided in Embodiment 1 and a control cabinet toggle switch control module provided in Embodiment 3. This design allows a single control module to simultaneously control both buttons and knobs.

[0048] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A control module for a control cabinet push-button switch, characterized in that, The device includes a normally open and normally closed relay, at least two relays, and a control unit. The control unit controls the opening and closing of the relays. The normally open and normally closed relays have two external interfaces, and in the initial state, the two interfaces are connected through normally closed contacts. Each of the at least two relays has one external interface, and each relay connects to the normally open contacts of the normally open and normally closed relays through its normally open contacts. The device also includes a power supply and a communication interface, which is connected to the control unit by a control source switching switch to control the opening and closing of the normally open and normally closed relays.

2. The control cabinet push-button switch control module as described in claim 1, characterized in that, The relay also has normally closed contacts, wherein the normally closed contacts of one relay are connected in series with the coils of the other relays respectively. The normally closed contacts of the relay are initially in a closed state and the relay coils and the control unit are in an energized state.

3. A control module for a control cabinet push-button switch, characterized in that, It includes at least one normally open relay K1, at least one normally closed relay K2, and a control unit. The control unit is used to control the opening and closing of the normally open relay K1 and the normally closed relay K2. The normally open relay K1 and the normally closed relay K2 each have two interfaces for connecting to a push-button switch. It also has a power supply and communication interface, and a control source switching switch is provided between the power supply and the control unit to control the start and stop of the control unit.

4. A control cabinet push-button switch control module as described in any one of claims 1-3, characterized in that, The control unit is a microcontroller unit.

5. A control cabinet push-button switch control module as described in any one of claims 1-3, characterized in that, The power supply and communication interface communicate with the upper-level group control system based on the Homebus communication protocol.

6. The operating method of the control cabinet push-button switch control module according to any one of claims 1-2, characterized in that, Includes the following steps: When connecting to the control, disconnect the circuit at the input terminal of the knob, connect the power supply to one interface of the normally closed contact of the normally open and normally closed relay, and connect the other interface to the input terminal of the knob; the normally open contacts of the relay are connected to multiple output terminals of the knob respectively. Rotating the control source switch energizes the normally open and normally closed relays, and current flows to the normally open contacts of the relays. At this time, the corresponding circuit can be controlled by the control unit and the relays. Rotating the control source switch de-energizes the normally open and normally closed relays, and the relays and their contacts are in the default state. At this time, the equipment can be controlled by the knob.

7. The operating method of the control cabinet push-button switch control module according to claim 3, characterized in that, Includes the following steps: When connecting the control module, connect the normally open relay K1 in parallel with the start button of the control cabinet, and connect the normally closed relay K2 in series with the stop button of the control cabinet. Rotating the control source switch energizes the control unit and normally open relays K1 and K2, allowing the control unit to control the operation of normally open relays K1 and K2, thereby starting or stopping the equipment. Rotating the control source switch de-energizes the control unit and normally open relays K1 and K2, keeping normally open relay K1 open and normally closed relay K2 closed. The equipment can then be started or stopped using the control cabinet door button.

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