A universal control signal interlock module

Abstract

The present invention provides a universal control signal interlock module, including a control system connection terminal, a frequency converter connection terminal, an external power supply connection terminal, a control mode switch connection terminal, and a device connection terminal. The interlock module is connected to the control system, frequency converter, external power supply, control mode switch, and device terminal via the control system connection terminal, frequency converter connection terminal, external power supply connection terminal, control mode switch connection terminal, and device connection terminal. The interlock module provided by the present invention can simultaneously adapt to two frequency converters driving three water pumps and two frequency converters driving four water pumps. The two modes can be switched simply by turning the mode selector switch on and off, making it easy to use and having extremely high application value.

Description

Technical Field

[0001] The invention belongs to the field of automatic control technology, and in particular relates to a universal control signal interlocking module. Background Art

[0002] In water circulation systems, water pumps often operate in alternating mode. A typical situation is that 3 to 4 water pumps are equipped, but only 2 of them need to run at the same time to meet the flow requirements, that is, the water pumps can be shut down in turn, thereby improving the reliability and service life of the circulation system.

[0003] Because the pumps operate alternately, equipping each pump with a separate VFD would result in unnecessary costs. For example, if only two of the three or four pumps need to operate simultaneously, the ideal solution is to use only two VFDs, with each alternating between them supplying power to the pumps. If two VFDs are driving three pumps, the following scheme can be employed: Pump A is powered by VFD #1, Pump B by VFD #2, and Pump C is alternately powered by VFDs #1 and #2. This ensures that only two of the three pumps are operating, and all pumps can be shut down in rotation. Similarly, if two VFDs are driving four pumps, the following scheme can be employed: Pumps A and B are powered by VFD #1, and Pumps C and D are powered by VFD #2. This also ensures that only two of the four pumps are operating, and all pumps can be shut down in rotation.

[0004] However, in the above control method, three important issues must be resolved to ensure safe and reliable operation of the system: (1) It must be ensured that the control system will not start two water pumps corresponding to the same inverter at the same time. (2) For the situation where two inverters drive three water pumps, it is necessary to avoid two inverters supplying power to one water pump at the same time. (3) When the inverter is in operation, it should be able to lock the power supply status of the corresponding water pump, that is, the water pump switching must be performed when the inverter is shut down. The traditional solution to the above problem is to set up interlocking on the strong power side, and the circuit is very complicated, making construction and maintenance difficult. However, if interlocking is set up on the weak power side, that is, on the control system side, the wiring can be greatly simplified, making construction and maintenance more convenient. The present invention provides a control signal interlocking module for the above situation. Summary of the Invention

[0005] In view of this, the present invention aims to overcome the deficiencies of the above-mentioned problems in the prior art and proposes a universal control signal interlocking module.

[0006] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0007] A universal control signal interlock module includes a control system connection terminal, a frequency converter connection terminal, an external power supply connection terminal, a control mode switch connection terminal, and a device connection terminal. The interlock module is connected to the control system, frequency converter, external power supply, control mode switch connection terminal, and device terminal through the control system connection terminal, frequency converter connection terminal, external power supply connection terminal, control mode switch connection terminal, and device terminal, respectively. The interlock module is connected to a contactor through the device terminal, and then controls the frequency converter to supply power to a water pump through the contactor.

[0008] The control system connection end includes an interface C K1 、C K2 、C K3 、C K4 、C K5 、C K6 、C K7 、C K8 The inverter connection end includes an interface C B1 、C B2 The external power supply connection terminal includes an interface C D1 、C D2 The control mode switch connection end includes an interface C M1 、C M2 、C M3 、C M4 、C M5 、C M6 、C M7 、C M8 、C M9 The device connection end includes an interface C J1 、C J2 、C J3 、C J4 、C J5 ;

[0009] The interface C K1 One end is connected to the first automatic mode signal input of the control system, and the other end is connected to the control system through the interface C M1 Connect the first automatic mode signal output of the control mode switching switch end;

[0010] The interface C K2 One end is connected to the second automatic mode signal input of the control system, and the other end is connected to the second automatic mode signal input of the control system through the interface C M2 Connect the second automatic mode signal output of the control mode switching switch end;

[0011] The interface C K3 One end is connected to the third automatic mode signal input of the control system, and the other end is connected to the third automatic mode signal input of the control system through the interface C M3 Connect the third automatic mode signal output of the control mode switching switch terminal;

[0012] The interface C K4 One end is connected to the fourth automatic mode signal input of the control system, and the other end is connected to the fourth automatic mode signal input of the control system through the interface C M4 Connect the fourth automatic mode signal output of the control mode switching switch terminal;

[0013] The interface C K5 One end is connected to the fourth water pump automatic operation signal at the control system end, and the other end is connected to the positive electrode of diode VD1, and the negative electrode of VD1 is connected to node C S4 ;

[0014] The interface C K6 One end is connected to the second water pump automatic operation signal at the control system end, and the other end is connected to the positive electrode of diode VD2, and the negative electrode of VD2 is connected to node C S3 ;

[0015] The interface C K7 One end is connected to the third water pump automatic operation signal at the control system end, and the other end is connected to the positive electrode of diode VD3, and the negative electrode of VD3 is connected to node C S2 ;

[0016] The interface C K8 One end is connected to the automatic operation signal of the first water pump at the control system end, and the other end is connected to the positive electrode of diode VD4, and the negative electrode of VD4 is connected to node C S1 ;

[0017] The interface C M6 One end is connected to the manual operation signal of the first water pump at the control mode switch end, and the other end is connected to the positive electrode of diode VD7, and the negative electrode of VD7 is connected to node C S1 , node C S1 Connect to node C through fuse FU1 S9 Node C S9 On the one hand, through the normally open switch J of relay J1 1-4 Connection port C J2 , through interface C J2 Connect the first water pump running signal at the equipment end, and on the other hand, connect the coil of relay J1 and the normally closed switch J3 in series. 3-1 , then through node C S17 Connection port C D2 , and then connected to the external power supply DC 24V- terminal;

[0018] The interface C M7 One end is connected to the manual operation signal of the third water pump at the control mode switch end, and the other end is connected to the positive electrode of diode VD8, and the negative electrode of VD8 is connected to node C S2 , node C S2 Connect to node C through fuse FU2 S10 Node CS10 On the one hand, through the normally open switch J of relay J3 3-4 Connection port C J3 , through interface C J3 Connect the third water pump running signal at the equipment end, on the other hand, first pass through the coil of relay J3, and then at node C S13 Divided into two paths: one path is connected to the normally closed switch J of relay J4 4-2 , the other one is connected to the mode selection switch K1, and after passing through these two switches, at node C S14 They meet again at node C S14 Connect the normally closed switch J of relay J1 1-1 After that, through node C S18 Connection port C D2 , and then connected to the external power supply DC 24V- terminal;

[0019] The interface C M8 One end is connected to the manual operation signal of the second water pump at the control mode switch end, and the other end is connected to the positive electrode of diode VD9, and the negative electrode of VD9 is connected to node C S3 , node C S3 Connect to node C through fuse FU3 S11 Node C S11 On the one hand, through the normally open switch J of relay J2 2-4 Connection port C J4 , through interface C J4 Connect the second water pump running signal at the equipment end, and on the other hand, connect the coil of relay J2 and the normally closed switch J of relay J4 in series. 4-1 , then through node C S19 Connection port C D2 , and then connected to the external power supply DC 24V- terminal;

[0020] The interface C M9 One end is connected to the fourth water pump manual operation signal at the control mode switch end, and the other end is connected to the diode VD 10 Positive electrode, VD 10 Negative connection node C S4 , node C S4 Connect to node C through fuse FU4 S12 Node C S12 On the one hand, through the normally open switch J of relay J4 4-4 Connection port C J5 , through interface C J5 Connect the fourth water pump running signal at the equipment end, on the other hand, first pass through the coil of relay J4, and then at node C S15 Divided into two paths: one path is connected to the normally closed switch J of relay J3 3-2, the other one is connected to the mode selection switch K2, and after passing through these two switches, at node C S16 They meet again at node C S16 Connect the normally closed switch J of relay J2 2-1 After that, through node C S20 Connection port C D2 , and then connected to the external power supply DC 24V- terminal;

[0021] The interface C B1 One end is connected to the first inverter operation signal, and the other side passes through the fuse FU5 and the diode VD5 at the node C. S22 There are two ways of treatment: one way is through the normally open switch J of relay J1 1-3 After that, through node C S5 With node C S9 Connection; the other way through the normally open switch J of relay J3 3-3 After that, through node C S6 With node C S10 connect;

[0022] The interface C B2 One end is connected to the second inverter operation signal, and the other end passes through the fuse FU6 and diode VD6 at node C. S23 There are two ways of treatment: one way is through the normally open switch J of relay J2 2-3 After that, through node C S7 With node C S11 Connection; the other way through the normally open switch J of relay J4 4-3 After that, through node C S8 With node C S12 connect;

[0023] The interface C D1 One end is connected to the external power supply DC 24V+, and the other end is connected to the interface C M5 , through interface C M5 Connect the control mode switch terminal DC 24V+;

[0024] The interface C D2 One end is connected to the external power supply DC 24V-, and the other end is connected to node C S21 The punishment is divided into two paths: one of which is connected to the node C of the interlocking line in sequence S17 ~C S20 , the other way through interface C J1 Connect the device to DC 24V-.

[0025] Furthermore, the control system includes a DDC controller for receiving an automatic mode start signal and sending a water pump automatic mode operation signal.

[0026] Furthermore, the control mode switching switch includes a plurality of switches, through which an automatic mode start signal or a manual mode operation signal of each water pump is sent to the control system.

[0027] Furthermore, the device end includes four contactors for receiving water pump operation signals and using the operation signals to drive the contactors to close, thereby enabling the frequency converter to supply power to the water pump.

[0028] Furthermore, the external power supply is used to provide a DC 24V control signal.

[0029] Compared with the prior art, the universal control signal interlock module created by the present invention has the following advantages:

[0030] 1. The invention provides an interlocking module that can adapt to two situations: two inverters driving three water pumps and two inverters driving four water pumps. The two modes can be switched simply by turning the control mode selection switch on and off. It is easy to use and has extremely high application value.

[0031] 2. The interlocking module provided by the invention can ensure that only one of the water pumps corresponding to each inverter can operate through interlocking in the mode of two inverters driving three or four water pumps;

[0032] 3. The interlocking module provided by the present invention can ensure that the water pumps alternately powered by two inverters will not be powered by two inverters at the same time when two inverters are driving three water pumps.

[0033] 4. The invention creates a self-maintenance system for the water pump power supply state through the operating signal output by the inverter when the inverter is running, ensuring that the water pump cannot be switched when the inverter is running, thereby better ensuring equipment safety;

[0034] 5. The interlock module provided by this invention uses a standard DC 24V control power supply and can be used in various low-voltage control systems. Its use is not limited to water pump control, but can be used in various devices that require the same interlock mode.

[0035] 6. The interlocking module provided by the present invention realizes the interlocking of the water pump operating status in the low-voltage control system, without the need to set up an interlocking circuit on the high-voltage side, which greatly reduces the construction difficulty, reduces the possibility of wiring errors, and makes construction and maintenance more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0037] Figure 1 The circuit diagram of the control signal interlock module created by the present invention;

[0038] Figure 2 A schematic diagram of the connection between the control signal interlock module and the peripheral system created by the present invention;

[0039] Figure 3 The circuit diagram of the invention's two frequency converters driving four water pumps;

[0040] Figure 4 This is a working principle diagram of two frequency converters driving four water pumps created by the present invention;

[0041] Figure 5 The circuit diagram of two frequency converters driving three water pumps created by the present invention;

[0042] Figure 6 This is a working principle diagram of two frequency converters driving three water pumps created by the present invention. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first", "second" and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0047] like Figure 1-2 As shown, the present invention provides a universal control signal interlock module, including a circuit board, and a control system connection terminal, a frequency converter connection terminal, an external power supply connection terminal, a control mode switch connection terminal, and a device connection terminal provided on the circuit board. The interlock module is connected to the control system, the frequency converter, the external power supply, the control mode switch connection terminal, and the device terminal respectively through the control system connection terminal, the frequency converter connection terminal, the external power supply connection terminal, the control mode switch connection terminal, and the device connection terminal;

[0048] The control system connection end includes an interface C K1 、C K2 、C K3 、C K4 、C K5 、C K6 、C K7 、C K8 The inverter connection end includes an interface C B1 、C B2 The external power supply connection terminal includes an interface C D1 、C D2 The control mode switch connection end includes an interface C M1 、C M2 、C M3 、C M4 、C M5 、C M6 、C M7 、C M8 、C M9 The device connection end includes an interface C J1 、C J2 、C J3 、C J4 、C J5 .

[0049] Specifically, the control system includes a DDC controller, which is used to receive an automatic mode start signal and send a water pump automatic mode operation signal.

[0050] Specifically, the control mode switching switch includes a plurality of switches, through which an automatic mode start signal or a manual mode operation signal of each water pump is sent to the control system.

[0051] Specifically, the device end includes four contactors for receiving water pump operation signals and using the operation signals to drive the contactors to close, thereby enabling the frequency converter to supply power to the water pump.

[0052] Specifically, the external power supply is used to provide a DC 24V control signal.

[0053] In one embodiment, the interface C K1 One end is connected to the first automatic mode signal input of the control system, and the other end is connected to the control system through the interface C M1 Connect the first automatic mode signal output of the control mode switching switch end;

[0054] The interface C K2 One end is connected to the second automatic mode signal input of the control system, and the other end is connected to the second automatic mode signal input of the control system through the interface C M2 Connect the second automatic mode signal output of the control mode switching switch end;

[0055] The interface C K3 One end is connected to the third automatic mode signal input of the control system, and the other end is connected to the third automatic mode signal input of the control system through the interface C M3 Connect the third automatic mode signal output of the control mode switching switch terminal;

[0056] The interface C K4 One end is connected to the fourth automatic mode signal input of the control system, and the other end is connected to the fourth automatic mode signal input of the control system through the interface C M4 Connect the fourth automatic mode signal output of the control mode switching switch terminal;

[0057] The interface C K5 One end is connected to the fourth water pump automatic operation signal at the control system end, and the other end is connected to the positive electrode of diode VD1, and the negative electrode of VD1 is connected to node C S4 ;

[0058] The interface C K6 One end is connected to the second water pump automatic operation signal at the control system end, and the other end is connected to the positive electrode of diode VD2, and the negative electrode of VD2 is connected to node C S3 ;

[0059] The interface C K7 One end is connected to the third water pump automatic operation signal at the control system end, and the other end is connected to the positive electrode of diode VD3, and the negative electrode of VD3 is connected to node C S2 ;

[0060] The interface C K8One end is connected to the automatic operation signal of the first water pump at the control system end, and the other end is connected to the positive electrode of diode VD4, and the negative electrode of VD4 is connected to node C S1 ;

[0061] The interface C M6 One end is connected to the manual operation signal of the first water pump at the control mode switch end, and the other end is connected to the positive electrode of diode VD7, and the negative electrode of VD7 is connected to node C S1 , node C S1 Connect to node C through fuse FU1 S9 Node C S9 On the one hand, through the normally open switch J of relay J1 1-4 Connection port C J2 , through interface C J2 Connect the first water pump running signal at the equipment end, and on the other hand, connect the coil of relay J1 and the normally closed switch J3 in series. 3-1 , then through node C S17 Connection port C D2 , and then connected to the external power supply DC 24V- terminal;

[0062] The interface C M7 One end is connected to the manual operation signal of the third water pump at the control mode switch end, and the other end is connected to the positive electrode of diode VD8, and the negative electrode of VD8 is connected to node C S2 , node C S2 Connect to node C through fuse FU2 S10 Node C S10 On the one hand, through the normally open switch J of relay J3 3-4 Connection port C J3 , through interface C J3 Connect the third water pump running signal at the equipment end, on the other hand, first pass through the coil of relay J3, and then at node C S13 Divided into two paths: one path is connected to the normally closed switch J of relay J4 4-2 , the other one is connected to the mode selection switch K1, and after passing through these two switches, at node C S14 They meet again at node C S14 Connect the normally closed switch J of relay J1 1-1 After that, through node C S18 Connection port C D2 , and then connected to the external power supply DC 24V- terminal;

[0063] The interface C M8 One end is connected to the manual operation signal of the second water pump at the control mode switch end, and the other end is connected to the positive electrode of diode VD9, and the negative electrode of VD9 is connected to node C S3 , node C S3 Connect to node C through fuse FU3S11 Node C S11 On the one hand, through the normally open switch J of relay J2 2-4 Connection port C J4 , through interface C J4 Connect the second water pump running signal at the equipment end, and on the other hand, connect the coil of relay J2 and the normally closed switch J of relay J4 in series. 4-1 , then through node C S19 Connection port C D2 , and then connected to the external power supply DC 24V- terminal;

[0064] The interface C M9 One end is connected to the fourth water pump manual operation signal at the control mode switch end, and the other end is connected to the diode VD 10 Positive electrode, VD 10 Negative connection node C S4 , node C S4 Connect to node C through fuse FU4 S12 Node C S12 On the one hand, through the normally open switch J of relay J4 4-4 Connection port C J5 , through interface C J5 Connect the fourth water pump running signal at the equipment end, on the other hand, first pass through the coil of relay J4, and then at node C S15 Divided into two paths: one path is connected to the normally closed switch J of relay J3 3-2 , the other one is connected to the mode selection switch K2, and after passing through these two switches, at node C S16 They meet again at node C S16 Connect the normally closed switch J of relay J2 2-1 After that, through node C S20 Connection port C D2 , and then connected to the external power supply DC 24V- terminal.

[0065] The interface C D1 One end is connected to the external power supply DC 24V+, and the other end is connected to the interface C M5 , through interface C M5 Connect the control mode switch terminal DC 24V+;

[0066] The interface C D2 One end is connected to the external power supply DC 24V-, and the other end is connected to node C S21 The punishment is divided into two paths: one of which is connected to the node C of the interlocking line in sequence S17 ~C S20 , the other way through interface C J1 Connect the device to DC 24V-.

[0067] The control mode switch is used to send an automatic mode start signal or a manual operation signal to each water pump to the control system through multiple switches. In one embodiment, the common end of switch K3 is connected to interface C M5 , and then connect the external power supply DC 24V+; switch K3 contains 2 contacts, one side of the contact is connected to the interface C M1 、C M2 、C M3 、C M4 , the other side contact connects the parallel switch K 4-1 , K 4-3 , K 4-2 , K 4-4 , and then connect to interface C respectively M6 、C M7 、C M8 、C M9 .

[0068] When the control system needs to be automatically controlled, connect K3 to C M1 ~C M4 , so that the external DC 24V+ is connected through the interface C K1 ~C K4 Input control system, after receiving the above signal, the control system can enter the automatic control mode according to the program setting, and K5 ~C K8 Output DC 24V+ start signal. The above DC 24V+ signal passes through diodes VD1~VD4 and then transmits to node C. S4 ~C S1 .

[0069] When the user needs manual control, turn K3 on switch K 4-1 ~K 4-4 , at this time interface C M1 ~C M4 No signal output, the control system does not receive the automatic mode signal and does not enter the automatic control mode. Interface C K5 ~C K8 No voltage is output; users can adjust K 4-1 ~K 4-4 One or more of them are closed, thereby transmitting the DC 24V+ signal to the corresponding manual operation signal interface C M6 ~C M9 The above DC 24V+ signal is respectively transmitted through diodes VD7 to VD 10 Then, it is passed to node C S1 ~C S4 .

[0070] It can be seen that node C S1 ~C S4Both are connected to two pump operation signals, one is the automatic operation signal from the control system end and the other is the manual operation signal from the control mode switch end. S1 ~C S4 The received operation signal is transmitted to node C after passing through fuses FU1 to FU4. S9 ~C S12 , and then through the relay switch J 1-4 、J 3-4 、J 2-4 、J 4-4 Passed to device-side interface C J2 ~C J5 .

[0071] The device end includes four contactors. One end of the first contactor, the third contactor, the second contactor, and the fourth contactor are connected to C J2 ~C J5 , that is, connect the corresponding water pump operation signal, and the other end is connected to C J1 , that is, connect the external power supply DC 24V-. When C J2 ~C J5 When a certain interface receives the DC 24V+ running signal of the corresponding water pump, the corresponding contactor is energized and closed, so that the inverter can supply power to the water pump.

[0072] When using two inverters to drive four water pumps, the first inverter supplies power to the first and third water pumps, and the second inverter supplies power to the second and fourth water pumps. Figure 3 、 Figure 4 As shown;

[0073] Before use, adjust the mode selection switches K1 and K2 to the closed state, and turn switch J 3-2 and J 4-2 Short circuit, forming Figure 3 The circuit shown.

[0074] Take the first water pump and the third water pump driven by the first frequency converter as an example. It is necessary to ensure that the two water pumps cannot run at the same time. When the first water pump needs to run, the control system in automatic mode uses interface C K8 Send out a running signal (DC 24V+ voltage), and the voltage is transmitted to node C through diode VD4 S1 ; In manual mode, the control mode switch is connected to the interface C M6 Send out a running signal (DC 24V+ voltage), and the voltage is transmitted to node C through diode VD7 S1 That is, both automatic and manual operation signals pass through node C. S1 Transmit. Run signal from node C S1 After passing through insurance FU1, it is transmitted to node C S9, and then divided into two paths, one path passes through the relay J1 coil and the relay J3 normally closed switch J 3-1 , so that the relay J1 is powered on and the normally open point J 1-4 Closed, normally closed point J 1-1 The other way is through the closed normally open point J 1-4 Connect to port C J2 , transmit the DC 24V+ operation signal to the first water pump operation signal at the equipment end. At the same time, due to the normally closed point J 1-1 Disconnect, relay J3 must be in the power-off state, and its normally open switch J 3-4 Keep disconnected. At this time, even if the control system is connected via interface C K7 , or control mode switch via interface C M7 To node C S10 Output operation signal (the reason may be automatic control system failure, manual misoperation or external signal interference, etc.), and it cannot pass J 3-4 The signal is transmitted to the device, ensuring that when the first pump is running, the third pump cannot receive the running signal. Similarly, when the third pump is running, the first pump cannot receive the running signal. In summary, only one of the first and third pumps can receive the running signal, achieving interlocking between the two pumps.

[0075] Similarly, only one of the second water pump and the fourth water pump can receive the operation signal, thus achieving interlocking between the two water pumps.

[0076] When two inverters are used to drive three water pumps, the first inverter supplies power to the first and third water pumps, and the second inverter supplies power to the second and third water pumps. That is, the third water pump is alternately powered by the two inverters. Figure 5 、 Figure 6 shown.

[0077] Before use, adjust the mode selection switches K1 and K2 to the off state to form Figure 5 For easier understanding, Figure 5 The manual operation signal of the third water pump is changed to the first manual operation signal of the third water pump, the manual operation signal of the fourth water pump is changed to the second manual operation signal of the third water pump, the automatic operation signal of the third water pump is changed to the first automatic operation signal of the third water pump, and the automatic operation signal of the fourth water pump is changed to the second automatic operation signal of the third water pump. Correspondingly, the relay J3 and its switch number are changed to J 31 , the relay J4 and its switch number are changed to J 32 .

[0078] Similar to the interlocking principle in the aforementioned two-inverter drive four-pump model, only one of the first pump's operating signal and the third pump's first operating signal can reach the device, and only one of the second pump's operating signal and the third pump's second operating signal can reach the device. That is, only one of the first and third pumps corresponding to the first inverter can receive the operating signal, and only one of the second and third pumps corresponding to the second inverter can receive the operating signal. This achieves interlocking of the control signals of the two pumps corresponding to the same inverter.

[0079] The special feature of this mode is that it is also necessary to ensure that the third water pump does not receive the first and second operation signals at the same time, that is, the third water pump can only be powered by one of the first inverter or the second inverter, not by both at the same time. The implementation method is as follows: When the first inverter is supplying power to the third water pump, the first manual or automatic operation signal of the third water pump is transmitted to node C. S10 , relay J 31 Power on, its normally open switch J 31-4 Close, the first manual or automatic operation signal of the third water pump is sent to the equipment end; and its normally closed switch J 31-2 Disconnect, relay J 32 In the power-off state, normally open point J 32-4 Keep disconnected. At this time, even if node C S12 The second manual or automatic operation signal of the third water pump is received unexpectedly (the reason may be control system failure, manual misoperation or external signal interference, etc.), and it is also impossible to pass J 32-4 Similarly, when the third water pump receives the second manual or automatic operation signal, its first manual or automatic operation signal cannot be transmitted to the device end, thereby achieving the interlocking of the two control signals of the third water pump.

[0080] The interface C B1 One end is connected to the first inverter operation signal, and the other side passes through the fuse FU5 and the diode VD5 at the node C. S22 There are two ways of treatment: one way is through the normally open switch J of relay J1 1-3 After that, through node C S5 With node C S9 Connection; the other way through the normally open switch J of relay J3 3-3 After that, through node C S6 With node C S10 connect;

[0081] The interface C B2 One end is connected to the second inverter operation signal, and the other end passes through the fuse FU6 and diode VD6 at node C. S23 There are two ways of treatment: one way is through the normally open switch J of relay J2 2-3After that, through node C S7 With node C S11 Connection; the other way through the normally open switch J of relay J4 4-3 After that, through node C S8 With node C S12 connect.

[0082] The above node C S5 ~C S8 This is the self-holding signal input node. Self-holding is used to prevent the system from damaging the equipment due to water pump switching caused by control system failure or manual misoperation when the inverter is running. Since self-holding is only for two water pumps corresponding to the same inverter, its principle and usage are exactly the same when two inverters drive four water pumps and two inverters drive three water pumps. Figure 3 、 Figure 4 The working mode is introduced by taking the mode of two inverters driving four water pumps as an example.

[0083] Taking the first inverter and the first and third water pumps it drives as an example, when the first inverter is running, its operating signal (DC 24V+) is transmitted through interface C B1 , fuse FU5, diode VD5, and reaches node C S22 When the first water pump is in the starting state, the normally open switch J 1-3 Closed, node C S22 The DC 24V+ signal at the node passes through node C S5 Pass to C S9 Therefore, as long as the first inverter is still in operation, node C S9 There is always a DC 24V+ voltage at the pump, which is consistent with the start signal of the first water pump. In addition, due to the existence of the interlock mentioned above, the relay J3 is in the power-off state when the first water pump is running, and its normally open switch J 3-3 Disconnected, the self-holding signal cannot be transmitted to node C S10 .

[0084] At this time, assuming that the control system or the control mode switch sends an error signal due to a fault, misoperation or external signal interference, the first water pump operation signal is directly stopped without stopping the first inverter, and the third water pump operation signal is sent. S9The DC 24V+ self-holding signal is present at the output. Due to the interlocking function described above, the first pump remains running, and the third pump's start signal cannot be transmitted to the device. Therefore, to switch to the third pump, not only must the first pump's start signal be deactivated, but the first inverter must also be shut down. Similarly, when the first inverter is driving the third pump, the first pump cannot be started without shutting down the inverter. In summary, while the first inverter is running, the first and third pumps controlled by it cannot be switched. To switch pumps, the first inverter must first be shut down, ensuring that the first inverter maintains its power supply status to the pumps.

[0085] Similarly, when the second inverter is running, the second and fourth water pumps it drives cannot be switched. If the water pump needs to be switched, the second inverter must first be stopped, thus ensuring that the second inverter maintains the power supply status of the water pumps.

[0086] Diode VD1-VD 10 It is used to isolate the automatic operation signal of the water pump, the manual operation signal and the inverter operation signal (i.e., the self-holding signal). On the one hand, it can eliminate the mutual influence between the signals, and on the other hand, it can also protect the control system and the inverter. For example, when the first inverter drives the first water pump to operate in the manual state, node C S1 Received interface C M6 The DC 24V+ start signal is sent, and node C S5 Received interface C B1 The DC 24V+ self-holding signal is not transmitted to the interface C due to the presence of diode VD4. K8 , thus realizing the function of signal isolation.

[0087] Fuses FU1-FU6 are used to prevent damage to the interlock module caused by excessive current in the control circuit, and provide safety protection in the event of unexpected conditions such as short circuits and overvoltage.

[0088] The above description is only 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 in the scope of protection of the present invention.

Claims

1. A universal control signal interlock module, characterized in that: It includes a control system connection end, a frequency converter connection end, an external power supply connection end, a control mode switch connection end, and a device connection end. The interlocking module is connected to the control system, the frequency converter, the external power supply, the control mode switch connection end, and the device end respectively through the control system connection end, the frequency converter connection end, the external power supply connection end, the control mode switch connection end, and the device connection end. The interlocking module is connected to the contactor through the device end, and then controls the frequency converter to supply power to the water pump through the contactor; The control system connection end includes an interface C K1 、C K2 、C K3 、C K4 、C K5 、C K6 、C K7 、C K8 The inverter connection end includes an interface C B1 、C B2 The external power connection terminal includes an interface C D1 、C D2 The control mode switch connection end includes an interface C M1 、C M2 、C M3 、C M4 、C M5 、C M6 、C M7 、C M8 、C M9 The device connection end includes an interface C J1 、C J2 、C J3 、C J4 、C J5 ; The interface C K1 One end is connected to the first automatic mode signal input of the control system, and the other end is connected to the control system through the interface C M1 Connect the first automatic mode signal output of the control mode switching switch end; The interface C K2 One end is connected to the second automatic mode signal input of the control system, and the other end is connected to the second automatic mode signal input of the control system through the interface C M2 Connect the second automatic mode signal output of the control mode switching switch end; The interface C K3 One end is connected to the third automatic mode signal input of the control system, and the other end is connected to the third automatic mode signal input of the control system through the interface C M3 Connect the third automatic mode signal output of the control mode switching switch terminal; The interface C K4 One end is connected to the fourth automatic mode signal input of the control system, and the other end is connected to the fourth automatic mode signal input of the control system through the interface C M4 Connect the fourth automatic mode signal output of the control mode switching switch terminal; The interface C K5 One end is connected to the fourth water pump automatic operation signal at the control system end, and the other end is connected to the positive electrode of diode VD1, and the negative electrode of VD1 is connected to node C S4 ; The interface C K6 One end is connected to the second water pump automatic operation signal at the control system end, and the other end is connected to the positive electrode of diode VD2, and the negative electrode of VD2 is connected to node C S3 ; The interface C K7 One end is connected to the third water pump automatic operation signal at the control system end, and the other end is connected to the positive electrode of diode VD3, and the negative electrode of VD3 is connected to node C S2 ; The interface C K8 One end is connected to the automatic operation signal of the first water pump at the control system end, and the other end is connected to the positive electrode of diode VD4, and the negative electrode of VD4 is connected to node C S1 ; The interface C M6 One end is connected to the manual operation signal of the first water pump at the control mode switch end, and the other end is connected to the positive electrode of diode VD7, and the negative electrode of VD7 is connected to node C S1 , node C S1 Connect to node C through fuse FU1 S9 Node C S9 On the one hand, through the normally open switch J of relay J1 1-4 Connection port C J2 , through interface C J2 Connect the first water pump running signal at the equipment end, and on the other hand, connect the coil of relay J1 and the normally closed switch J3 in series. 3-1 , then through node C S17 Connection port C D2 , and then connected to the external power supply DC 24V- terminal; The interface C M7 One end is connected to the manual operation signal of the third water pump at the control mode switch end, and the other end is connected to the positive electrode of diode VD8, and the negative electrode of VD8 is connected to node C S2 , node C S2 Connect to node C through fuse FU2 S10 Node C S10 On the one hand, through the normally open switch J of relay J3 3-4 Connection port C J3 , through interface C J3 Connect the third pump running signal at the equipment end, on the other hand, first pass through the coil of relay J3, and then at node C S13 Divided into two paths: one path is connected to the normally closed switch J of relay J4 4-2 , the other one is connected to the mode selection switch K1, and after passing through these two switches, at node C S14 They meet again at node C S14 Connect the normally closed switch J of relay J1 1-1 After that, through node C S18 Connection port C D2 , and then connected to the external power supply DC 24V- terminal; The interface C M8 One end is connected to the manual operation signal of the second water pump at the control mode switch end, and the other end is connected to the positive electrode of diode VD9, and the negative electrode of VD9 is connected to node C S3 , node C S3 Connect to node C through fuse FU3 S11 Node C S11 On the one hand, through the normally open switch J of relay J2 2-4 Connection port C J4 , through interface C J4 Connect the second water pump running signal at the equipment end, and on the other hand, connect the coil of relay J2 and the normally closed switch J of relay J4 in series. 4-1 , then through node C S19 Connection port C D2 , and then connected to the external power supply DC 24V- terminal; The interface C M9 One end is connected to the fourth water pump manual operation signal at the control mode switch end, and the other end is connected to the diode VD 10 Positive electrode, VD 10 Negative connection node C S4 , node C S4 Connect to node C through fuse FU4 S12 Node C S12 On the one hand, the normally open switch J 4-4 Connection port C J5 , through interface C J5 Connect the fourth water pump running signal at the equipment end, on the other hand, first pass through the coil of relay J4, and then at node C S15 Divided into two paths: one path is connected to the normally closed switch J of relay J3 3-2 , the other one is connected to the mode selection switch K2, and after passing through these two switches, at node C S16 They meet again at node C S16 Connect the normally closed switch J of relay J2 2-1 After that, through node C S20 Connection port C D2 , and then connected to the external power supply DC 24V- terminal; The interface C B1 One end is connected to the first inverter operation signal, and the other side passes through the fuse FU5 and the diode VD5 at the node C. S22 There are two ways of treatment: one way is through the normally open switch J of relay J1 1-3 After that, through node C S5 With node C S9 Connection; the other way through the normally open switch J of relay J3 3-3 After that, through node C S6 With node C S10 connect; The interface C B2 One end is connected to the second inverter operation signal, and the other end passes through the fuse FU6 and diode VD6 at node C. S23 There are two ways of treatment: one way is through the normally open switch J of relay J2 2-3 After that, through node C S7 With node C S11 Connection; the other way through the normally open switch J of relay J4 4-3 After that, through node C S8 With node C S12 connect; The interface C D1 One end is connected to the external power supply DC 24V+, and the other end is connected to the interface C M5 , through interface C M5 Connect the control mode switch terminal DC 24V+; The interface C D2 One end is connected to the external power supply DC 24V-, and the other end is connected to node C S21 The punishment is divided into two paths: one of which is connected to the node C of the interlocking line in sequence S17 ~C S20 , the other way through interface C J1 Connect the device to DC 24V-.

2. A universal control signal interlock module according to claim 1, characterized in that: The control system includes a DDC controller, which is used to receive an automatic mode start signal and send a water pump automatic mode operation signal.

3. The universal control signal interlock module according to claim 1, characterized in that: The control mode switching switch includes a plurality of switches, through which an automatic mode start signal or a manual mode operation signal of each water pump is sent to the control system.

4. The universal control signal interlock module according to claim 1, characterized in that: The device end includes four contactors for receiving water pump operation signals and using the operation signals to drive the contactors to close, thereby realizing power supply from the frequency converter to the water pump.

5. The universal control signal interlock module according to claim 1, characterized in that: The external power supply is used to provide a DC 24V control signal.

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