Simulation test device for various major loop control logics of high-voltage frequency converter

Abstract

The utility model relates to a simulation test device for various major loop control logics of a high-voltage frequency converter. The simulation test device comprises a control signal receiving circuit, a state feedback circuit, a contactor control circuit and a power frequency branch control circuit, the device is characterized in that the control signal receiving circuit is composed of a relay K1, one end of a coil of the relay K1 is connected with the positive electrode of a 24V direct-current power supply, and the other end forms a control input end; the state feedback circuit is used for simulating state signals of an isolation disconnecting link and a contactor in a main loop topology circuit of the high-voltage frequency converter; the relay control circuit is composed of a relay K2, a relay KM3, a relay KM4 and a relay KM5. The simulation test device for various major loop control logics of the high-voltage frequency converter can simulate various forms of major loop topology circuits of the high-voltage frequency converter and then verify an upgrade program, thereby facilitating verification of the upgrade program, saving manpower and material resources, and being used for training and teaching new employees.

Description

A simulation and testing device for multiple main circuit control logics of a high-voltage frequency converter Technical Field

[0001] This utility model relates to a simulation testing device, and more specifically, to a simulation testing device for multiple main circuit control logics of a high-voltage frequency converter. Background Technology

[0002] There are more than a dozen main circuit topologies for high-voltage frequency converters. Figure 1 in the instruction manual shows nine main circuit topologies for existing high-voltage frequency converters. The high-voltage frequency converter is controlled by contactors and isolating switches to drive one or two load motors in either variable frequency or mains frequency mode. When updating the control software, the logic of each main circuit needs to be verified. Verification using actual machine models is inefficient; finding and verifying all models is impractical, and maintaining a complete set for each model is also unrealistic. Simulating with PLC software presents challenges in simulating certain circuits, and simulating small relay wiring is complex and prone to errors. To address these issues, a simulation test device using a printed circuit board to simulate the control logic of various main circuits of high-voltage frequency converters was developed. This device can be used for logic testing and for training new employees. Summary of the Invention

[0003] In order to overcome the shortcomings of the above-mentioned technical problems, this utility model provides a simulation test device for multiple main circuit control logics of high voltage frequency converters.

[0004] This utility model discloses a simulation and testing device for multiple main circuit control logics of a high-voltage frequency converter, comprising a control signal receiving circuit, a status feedback circuit, a contactor control circuit, and a power frequency branch control circuit for simulating the main circuit topology of the high-voltage frequency converter. The control signal receiving circuit is characterized by being composed of a relay K1, with one end of the relay K1 coil connected to the positive terminal of a 24V DC power supply and the other end forming a control input terminal. The status feedback circuit is used to simulate the status signals of the isolating switch and contactor in the main circuit topology of the high-voltage frequency converter, and the status feedback circuit is composed of a DIP switch Q. K is composed of a DIP switch QK, one end of which is connected to the positive terminal of a 24V DC power supply, and the other end forms a status output terminal; the relay control circuit is composed of relays K2, KM3, KM4 and KM5. Relays KM3, KM4 and KM5 are used to simulate the contactor in the main circuit topology of the high-voltage frequency converter. The coil of relay KM3, the normally closed contact of relay KM4, the normally closed contact of relay KM5 and the normally open contact of relay K2 are connected in series and their two ends are connected to the positive and negative terminals of the 24V DC power supply respectively.

[0005] This utility model discloses a simulation test device for multiple main circuit control logics of a high-voltage frequency converter. The power frequency branch control circuit consists of relays KA, K3, KM1, KM2, push-button switches SB1 and SB2. The normally open contacts of relays K3, KA, and KM2, and the coils of push-button switches SB1 and KM1 are connected in series, with their two ends connected to the positive and negative terminals of a 24V DC power supply, respectively. The two ends of push-button switch SB2 and the normally closed contact of relay KA are connected in series, with their two ends connected to the positive terminal of the 24V DC power supply and the connection between the normally open contacts of relays KA and KM2, respectively. The normally open contact of relay KM1 is connected to the positive terminal of the 24V DC power supply and the connection between the normally open contacts of relays KA and KM2, respectively.

[0006] The present invention relates to a high-voltage frequency converter multi-main circuit control logic simulation test device, wherein the normally closed contacts of relays KM4 and / or KM5 are short-circuited by jumpers.

[0007] This utility model discloses a high-voltage frequency converter multi-main circuit control logic simulation test device, wherein the control signal receiving circuit, status feedback circuit, relay control circuit and power frequency branch control circuit constitute the action execution component.

[0008] This utility model discloses a high-voltage frequency converter multi-main circuit control logic simulation test device, including a control circuit. The control circuit is used to run the control program of the simulated high-voltage frequency converter main circuit topology circuit to be upgraded. The action execution component is connected to a control input port, a status output port, a status indicator circuit and a power supply port. The status input port and the status output port are both connected to the control circuit, and the power supply port is connected to a 24V DC power supply.

[0009] The beneficial effects of this utility model are as follows: This utility model's high-voltage frequency converter multi-main-circuit control logic simulation and testing device is equipped with a control signal receiving circuit, a state feedback circuit, a relay control circuit, and a power frequency branch control circuit. The relays in the relay control circuit simulate the contactors in the main circuit topology of the high-voltage frequency converter, and the relays in the main circuit topology of the high-voltage frequency converter simulate the contactors in the power frequency branch of the main circuit topology of the high-voltage frequency converter. The relays in the control signal receiving circuit control the energizing and de-energizing states of the relay coils in the energy-saving control circuit and the power frequency branch control circuit. The state feedback circuit simulates the contactors and isolation circuits in the main circuit topology of the high-voltage frequency converter. By analyzing the state of the disconnect switch, various forms of high-voltage frequency converter main circuit topologies can be simulated using the control signal receiving circuit, state feedback circuit, relay control circuit, and power frequency branch control circuit. When testing the control program to be upgraded, it is not necessary to find and verify the various forms of actual frequency converter main circuit topologies. Instead, the upgrade program can be verified by simulating various forms of high-voltage frequency converter main circuit topologies using the high-voltage frequency converter multi-main circuit control logic simulation test device of this invention, which greatly facilitates the verification of the upgrade program and saves manpower and resources. At the same time, the high-voltage frequency converter multi-main circuit control logic simulation test device of this invention can also be used for new employee training. Attached Figure Description

[0010] Figure 1 shows the main circuit diagram of nine existing high-voltage frequency converters.

[0011] In Figure 1: 1 is a high-voltage frequency converter, 2 is a high-voltage AC power supply, QS1~QS6 are all isolating switches, and KM1~KM6 are all contactors.

[0012] Figure 2 is a circuit diagram of the control signal receiving circuit in this utility model;

[0013] Figure 3 is a circuit diagram of the state feedback circuit in this utility model;

[0014] Figure 4 is a circuit diagram of the relay control circuit in this utility model;

[0015] Figure 5 is a circuit diagram of the power frequency branch control circuit in this utility model;

[0016] Figure 6 is a schematic diagram of the simulation test device for multiple main circuit control logics of the high voltage frequency converter of this utility model.

[0017] In Figures 2 to 6: 3 is the action execution component, 4 is the control input port, 5 is the status output port, 6 is the power supply port, 7 is the status indicator circuit, 8 is the control circuit, 9 is the 24V DC power supply, 10 is the control input terminal, and 11 is the status output terminal; K1, K2, K3, KA, KM1, KM2, KM3, KM4, and KM5 are all relays, QK is a DIP switch, and SB1 and SB2 are both push-button switches. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 shows the main circuit diagrams of nine existing high-voltage frequency converters. In circuit 1 of Figure 1, high-voltage AC power 1 is connected to the input terminal of high-voltage frequency converter 1 via contactor KM1 (i.e., the normally open contact of contactor KM1). The output terminal of high-voltage frequency converter 1 is used to drive motor-type loads. In circuit 2, high-voltage AC power 1 is connected to the input terminal of high-voltage frequency converter 1 via isolating switch QS1 and contactor KM1. The output terminal of the high-voltage frequency converter is connected to the load via isolating switch QS2. Isolating switch QS3 is installed on the power frequency circuit between the load and the high-voltage AC power supply 2. Main circuits 6 to 9 are used to control two loads using one high-voltage frequency converter 1, and the circuits controlling the two loads are symmetrical. In main circuit 6, high-voltage AC power 2 is connected to the input terminal of high-voltage frequency converter 1 via isolating switches QS1 and QS4. The output terminal of high-voltage frequency converter 1 is connected to the two loads via isolating switches QS2 and QS6 respectively. Isolating switches QS3 and QS5 are respectively installed on the power frequency circuits of the two loads.

[0020] As can be seen, there are nine types of main circuit diagrams for high-voltage frequency converters shown in Figure 1. In the process of upgrading the control program of the main circuit topology of the high-voltage frequency converter, it is impractical to find all models if actual models are used for verification. Therefore, this utility model provides a simulation test device for multiple main circuit control logics of high-voltage frequency converters to simulate various forms of the main circuit topology of high-voltage frequency converters.

[0021] The high-voltage frequency converter multi-main circuit control logic simulation test device of this utility model consists of a control signal receiving circuit, a status feedback circuit, a relay control circuit, and a power frequency branch control circuit. As shown in Figure 2, the circuit diagram of the control signal receiving circuit of this utility model is given. The control signal receiving circuit shown is composed of relay K1. One end of the coil of relay K1 is connected to the positive terminal of a 24V DC power supply, and the other end forms a control input terminal 10. The relay in the control signal receiving circuit is used to control the on and off state of the relays simulating the contactors in the relay control circuit and the power frequency control circuit. Therefore, the number of control signal receiving circuits is equal to the number of relays in the relay control circuit and the power frequency control circuit.

[0022] Figure 3 shows the circuit diagram of the state feedback circuit in this invention. The state feedback circuit simulates the state signals of the isolating switches and contactors in the main circuit topology of the high-voltage frequency converter. The state feedback circuit consists of a DIP switch QK, with one end forming a state output terminal and the other end connected to the positive terminal of a 24V DC power supply. In use, by short-circuiting the DIP switch QK, the corresponding isolating switch can be simulated as being in a closed state or the simulated contactor coil as being energized. It can be seen that the number of state feedback circuits is equal to the number of isolating switches and contactors to be simulated.

[0023] Figure 4 shows the circuit diagram of the relay control circuit in this utility model. The relay control circuit shown consists of relays K2, KM3, KM4 and KM5. The normally open contact of relay K2, the normally closed contact of relay KM5, the normally closed contact of relay KM4 and the coil of relay KM3 are connected in series and their two ends are connected to the positive and negative terminals of a 24V DC power supply. Relays KM3, KM4 and KM5 are used to simulate the contactors in the main circuit topology of the high-voltage frequency converter. Depending on the number of contactors being simulated, relays KM4 and / or KM5 can be shorted with jumpers.

[0024] Figure 5 shows the circuit diagram of the power frequency branch control circuit in this utility model. The power frequency branch control circuit is used to simulate the power frequency drive circuit of the load. It consists of relays KA, K3, KM1, KM2, push-button switch SB1, and push-button switch SB2. The normally open contact of relay K3, the normally open contact of relay KA, the normally closed contact of relay KM2, the push-button switch SB1, and the coil of relay KM1 are connected in series and their two ends are connected to the positive and negative terminals of the 24V DC power supply, respectively. The two ends of the push-button switch SB2 and the normally closed contact of relay KA are connected in series and their two ends are connected to the positive terminal of the 24V DC power supply and the line connecting the normally open contact of relay KA and the normally closed contact of relay KM2, respectively. The normally open contact of relay KM1 is connected to the positive terminal of the 24V DC power supply and the line connecting the normally open contact of relay KA and the normally closed contact of relay KM2, respectively.

[0025] The schematic diagram of the high-voltage frequency converter multi-main circuit control logic simulation test device of this utility model shows that the control signal receiving circuit, the status feedback circuit, the relay control circuit and the power frequency branch control circuit constitute the action execution component 3. The action execution component 3 is connected to the control input port 4, the status output port 5, the power supply port 6 and the status indication circuit 7. Among them, the control input port 4 is the collection of control input terminals 10 in all control signal receiving circuits, and the status output port 5 is the collection of status output terminals 11 in all feedback circuits.

[0026] The status indicator circuit 7 is used to indicate the status of the isolating switch and contactor to be simulated. The status indicator circuit 7 can be constructed using a light-emitting diode connected in series in the status feedback circuit. The power supply port 6 shown is connected to a 24V DC power supply. The control circuit 8 is used to run the control program of the main circuit topology of the simulated high-voltage frequency converter to be upgraded. The output and input terminals of the control circuit 8 are connected to the control input port 4 and the status output port 5, respectively.

[0027] The nine main circuit diagrams in Figure 1 are designated as Main Circuit 1, Main Circuit 2, ..., Main Circuit 9. The control signal receiving circuit, status feedback circuit, relay control circuit, and power frequency branch control circuit are labeled as ①, ②, ③, and ④, respectively. The implementation methods of the nine main circuit diagrams in Figure 1 are shown in Table 1.

[0028] Table 1

[0029]

[0030] As shown in the main circuit 1 of Figure 1, a contactor KM1 is used to control the operation of the high-voltage frequency converter 1. Therefore, a relay in a relay control circuit is needed to simulate the contactor KM1, a control signal receiving circuit is used to control the state of the relay, and a state feedback circuit is used to provide feedback on the state of the simulated contactor KM1. For the main circuit 3 in Figure 1, since no contactor is used, three state feedback circuits are used to provide feedback on the states of isolating switches QS1, QS2, and QS3 in circuit 3. Similarly, for the main circuit 6 in Figure 1, which only has isolating switches, only a state feedback circuit is needed.

[0031] As can be seen, by using the high-voltage frequency converter multi-main circuit control logic simulation test device of this utility model to simulate various forms of high-voltage frequency converter main circuit topology circuits, the upgrade program can be verified, which greatly facilitates the verification of the upgrade program, saves manpower and material resources, and can also be used for training new employees.

Claims

1. A simulation and testing device for multiple main circuit control logics of a high-voltage frequency converter, comprising a control signal receiving circuit, a status feedback circuit, a contactor control circuit, and a power frequency branch control circuit for simulating the main circuit topology of the high-voltage frequency converter; characterized in that: The control signal receiving circuit is composed of relay K1. One end of the coil of relay K1 is connected to the positive terminal of 24V DC power supply (9), and the other end forms the control input terminal (10). The status feedback circuit is used to simulate the status signals of the isolating switch and contactor in the main circuit topology of the high-voltage frequency converter. The status feedback circuit is composed of DIP switch QK. One end of DIP switch QK is connected to the positive terminal of 24V DC power supply, and the other end forms the status output terminal (11). The relay control circuit is composed of relay K2, relay KM3, relay KM4 and relay KM5. Relays KM3, KM4 and KM5 are used to simulate the contactor in the main circuit topology of the high-voltage frequency converter. The coil of relay KM3, the normally closed contact of relay KM4, the normally closed contact of relay KM5 and the normally open contact of relay K2 are connected in series and the two ends are respectively connected to the positive and negative terminals of 24V DC power supply.

2. The high-voltage frequency converter multi-main circuit control logic simulation test device according to claim 1, characterized in that: The power frequency branch control circuit consists of relays KA, K3, KM1, KM2, push-button switches SB1 and SB2. The normally open contacts of relays K3, KA, and KM2, and the coils of push-button switches SB1 and KM1 are connected in series, with their two ends connected to the positive and negative terminals of a 24V DC power supply, respectively. The two ends of push-button switch SB2 and the normally closed contact of relay KA are connected in series, with their two ends connected to the positive terminal of the 24V DC power supply and the connection between the normally open contacts of relay KA and KM2, respectively. The normally open contact of relay KM1 is connected to the positive terminal of the 24V DC power supply and the connection between the normally open contacts of relay KA and KM2, respectively.

3. The high-voltage frequency converter multi-main circuit control logic simulation test device according to claim 1 or 2, characterized in that: The normally closed contacts of relays KM4 and / or KM5 are short-circuited via jumpers.

4. The high-voltage frequency converter multi-main circuit control logic simulation test device according to claim 1 or 2, characterized in that: The control signal receiving circuit, status feedback circuit, relay control circuit and power frequency branch control circuit constitute the action execution component (3).

5. The high-voltage frequency converter multi-main circuit control logic simulation and testing device according to claim 4, characterized in that: Includes a control circuit (8), which is used to run the control program of the main circuit topology circuit of the analog high voltage frequency converter to be upgraded. The action execution component (3) is connected to a control input port (4), a status output port (5), a status indicator circuit (7) and a power supply port (6). The status input port and the status output port are both connected to the control circuit, and the power supply port is connected to a 24V DC power supply (9).

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