28V direct current contactor service life test adaptive monitoring system

Abstract

The invention discloses a 28V direct current contactor service life test adaptive monitoring system, which comprises a coil current sensor and a contact current sensor, the contact current sensor is connected between a load control switch and a product contact, the coil current sensor is connected between a coil control switch and a product coil, and the contact current sensor is connected between the coil control switch and the product coil. The coil current sensor and the contact current sensor are both connected with the data acquisition module, the data acquisition module is connected with the touch screen, and the load control switch and the coil control switch are both controlled by the switching value output module. By using the test monitoring device, self-adaptive monitoring, test information storage, abnormal protection and the like of the service life test of the 28V direct current contactor can be realized on the premise of not setting any parameter, and the working intensity is reduced. The coil interface and the load interface can be connected with a peripheral circuit, and the interface circuit is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of relays, in particular to a 28V DC contactor life test adaptive monitoring system. BACKGROUND

[0002] The 28V DC contactor is a common power control device, and the working voltage of the contact is generally 28V, and the maximum contact current can reach 1000A or more. When the contactor is subjected to life test, the rated load current is applied to the main contact according to the set on-off cycle to check whether the product meets the design requirements. The conventional test monitoring method is to judge the on-off state of the contact through the indicator light and ammeter. This method is relatively simple, but the observation and judgment ability of the test personnel is required, and the product switching situation needs to be observed in real time. When the product fails, the test intervention needs to be performed manually. In recent years, the more advanced test monitoring method is to use a computer plus a collection board card to control the test. In the case of abnormal monitoring test, the control output is disconnected. This method has high cost, and the control logic of the software is relatively rigid in actual use. Parameters need to be configured for different types of products, and test parameters, protection intervals, etc. need to be set. The operation process is complicated, and the workload of the test personnel is increased. How to use a more concise method to realize the test monitoring of the 28V DC contactor is an urgent problem for technicians in the field. The contactor state monitoring system disclosed in CN220438439U can automatically detect the number of coil attraction of the contactor, as well as the current and voltage of the coil, and then send the detected data to the data processing device in real time through the wireless communication module. The data processing device can monitor the state of the contactor according to the received data, provide reliable analysis and management tools for maintenance personnel, improve maintenance efficiency and reduce failure rate, and reduce labor cost and time cost by using the system. However, the detection is carried out by the voltage and current collection circuit to detect the attraction process of the contactor, and the clock module is used to monitor the attraction time, so that the detection and control system structure is complex, and the cost is increased. SUMMARY

[0003] The purpose of the present application is to solve the problem of manual assistance in the detection process of the existing contactor, and to provide a contactor monitoring system which can record and save the main contact current and product coil current in real time, and can operate without parameter setting.

[0004] The technical scheme of the present application: The application discloses a 28V DC contactor life test adaptive monitoring system, which comprises a coil current sensor and a contact current sensor, the contact current sensor is connected between a load control switch and product contacts respectively, the coil current sensor is connected between a coil control switch and a product coil, the coil current sensor and the contact current sensor are connected with a data acquisition module, the data acquisition module is connected with a touch screen, and the load control switch and the coil control switch are controlled through a switch output module.

[0005] The application further comprises a 28V DC power supply and a coil power supply, the 28V DC power supply supplies power for the load and the load control switch respectively, and the coil power supply supplies power for the coil control switch and the product coil respectively.

[0006] The data acquisition module exchanges data with the touch screen interface through a MODBUS 485 communication protocol and transmits data acquisition information in real time.

[0007] The touch screen displays the working state in real time through a man-machine interface and records the coil current and contact current information collected by the data acquisition module in real time.

[0008] The touch screen further comprises software logic, which performs real-time calculation on the first three working cycles of the life test started at any time, judges the current working type and quickly enters the monitoring state to monitor the subsequent working cycles.

[0009] The application has the following beneficial effects: The test monitoring device can realize 28V DC contactor life test adaptive monitoring, test information storage and abnormal protection without any parameter setting, and reduces the working intensity. The device can be connected with peripheral circuits through a coil interface and a load interface, and the interface circuit is simple. The main contact current and the product coil current can be recorded and saved in real time, and the device can be operated without parameter setting. DETAILED DESCRIPTION

[0010] Figure 1 The application discloses a 28V DC contactor life test adaptive monitoring system, which comprises a coil current sensor and a contact current sensor, the contact current sensor is connected between a load control switch and product contacts respectively, the coil current sensor is connected between a coil control switch and a product coil, the coil current sensor and the contact current sensor are connected with a data acquisition module, the data acquisition module is connected with a touch screen, and the load control switch and the coil control switch are controlled through a switch output module. CONCLUSION

[0011] Embodiment 1 As Figure 1 The monitoring device is connected with external equipment through a coil circuit and a load circuit. After the monitoring device is powered on, the device can automatically enter the monitoring state without any operation, judges the working state through real-time acquisition of the coil current and the contact current, and provides test data acquisition and monitoring support for the contactor life test.

[0012] The specific structure of the protection device is as follows: 1 coil current sensor is used for monitoring coil current, 1 contact current sensor is used for monitoring contact current, and contact current information is collected in real time. The data acquisition module communicates with the touch screen in real time through the MODBUS 485 communication protocol, and the touch screen can record and save the coil and contact current information in real time. Through the monitoring logic built in the software, the first three working cycles before the life test starting at any time are calculated in real time, the current working type is judged, and the monitoring state is quickly entered, and the subsequent working cycles are monitored. In the presence of contact bonding, contact disconnection, contact current anomaly, coil current anomaly and other fault modes, according to the severity of the fault consequences, the switch output module is driven to issue corresponding instructions, such as issuing an alarm prompt, disconnecting the coil, and cutting off the load.

[0013] The coil current sensor is used for monitoring the coil current, judging the working state of the coil and the current stability. 2, the contact current sensor: the contact current sensor is used for monitoring the current of the main contact loop, and is used for judging the on-off state of the contact and the current stability. 3, data acquisition module: data exchange is carried out with the touch screen interface through MODBUS 485 communication protocol, and data acquisition information is transmitted in real time. 4, touch screen: the working state is displayed in real time through the man-machine interface, which is the software control core of the monitoring device, and communicates with the acquisition module and the output module in real time, records the coil current and contact current information collected in real time, and saves them in the storage area. The system can judge the coil current and contact current information under standby condition, calculate the first three working cycles before the life test starting at any time in real time, that is, when the coil current and contact current appear regular cyclic change, the current working type is judged, and the monitoring state is immediately entered. When the contact bonding, contact disconnection, contact current anomaly, coil current anomaly and other fault phenomena occur, the software selects to issue alarm prompt, disconnects the coil, cuts off the load and other operations according to the severity of the fault. When the life test working cycle ends normally, that is, when the coil current and contact current no longer change cyclically, the system automatically returns to standby state. When the test ends normally or the alarm prompt appears in the middle of the test, the device will generate a test summary under the monitoring state of the last round, such as working cycle, coil current range, contact current range, test number, etc. 5, control switch: including coil control switch and load control switch, the coil control switch is used for cutting off the coil loop, and the load control switch is used for cutting off the load loop. 4, DC power supply, DC load and test product: the monitoring device is connected with the test product, DC power supply and load through the coil loop interface and load loop interface, which can realize self-adaptive, uninterrupted and unattended test monitoring, and form a flexible and reliable test monitoring system.

[0014] The life test adaptive monitoring device uses a mobile small cabinet as a device carrier, which is convenient for mobile use. The obvious part above the cabinet is a touch screen interface, which is convenient for human-computer interaction. The device has a coil control switch and a load control switch, which are connected with the peripheral circuit through the coil loop interface and the load loop interface. The external power supply is 220V AC, equipped with a fuse, and the internal 24V DC switching power supply supplies power to the current sensor, input / output module and other devices.

[0015] During use, the coil loop and the load loop are connected with the peripheral circuit respectively. After the system is powered on, it automatically enters the standby state. The current working state is displayed through the touch screen interface, and the life test process starting at any time can be monitored at any time without any operation.

Claims

1. An adaptive monitoring system for life testing of a 28V DC contactor, characterized in that: It includes a coil current sensor and a contact current sensor. The contact current sensor is connected between the load control switch and the product contact, and the coil current sensor is connected between the coil control switch and the product coil. Both the coil current sensor and the contact current sensor are connected to a data acquisition module, which is connected to a touch screen. Both the load control switch and the coil control switch are controlled by a switch output module.

2. The adaptive monitoring system for 28V DC contactor life test according to claim 1, characterized in that: It also includes a 28V DC power supply and a coil power supply. The 28V DC power supply powers the load and the load control switch, while the coil power supply powers the coil control switch and the product coil.

3. The adaptive monitoring system for 28V DC contactor life test according to claim 1, characterized in that: The data acquisition module exchanges data with the touch screen interface via the MODBUS 485 communication protocol and transmits the acquired data information in real time.

4. The adaptive monitoring system for 28V DC contactor life test according to claim 1, characterized in that: The touchscreen displays the working status in real time through the human-machine interface and records the coil current and contact current information collected by the data acquisition module in real time.

5. The adaptive monitoring system for 28V DC contactor life test according to claim 1, characterized in that: The touchscreen also has built-in software logic that performs real-time calculations for the first three working cycles of a life test starting at any time, determines the current working type, and quickly enters the monitoring state to monitor subsequent working cycles.

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