CN201611768U - Motor protection controller - Google Patents

Abstract

The utility model discloses a modularized multifunctional intelligent motor protection controller with various communication functions. It adopts built-in and external large and small current transformers, modular PCB board setting and connection methods, and additional functions are diversified and standardized. Communication interface settings based on a variety of industrial field buses (Modbus, DeviceNet, PROFIBUS-DP). It is suitable for various needs and choices of users, meets complex control with high degree of automation on site, and is low in price and easy to install.

Description

A motor protection controller

Technical field:

The utility model relates to a motor protector used in the electric power field, in particular to a multifunctional intelligent motor protection controller with multiple communication functions and modularization.

Background technique:

At present, domestic motor protection is mostly controlled by relay devices (circuit breakers, air switches, thermal relays) or analog electronic circuits, which have poor reliability, low precision, few protection functions, and there is no fieldbus communication function and display, which is inconvenient The installation and interchangeability are poor, and it is not suitable for various installation occasions and the actual needs of users.

Although motor protection is an independent unit in many sites, in many large-scale industrial control fields, many control systems have linkage mechanical properties, so input and output interfaces of various motor control units are required, especially multiple communication methods and dual The communication function is used to meet the actual needs, and it is convenient to configure and exchange information with different manufacturers and different instruments.

Therefore, there is a need for an intelligent networked motor protection controller that can provide multiple external functions and multiple communication methods to meet the needs of different users, while being convenient for production and installation, and low in cost.

Utility model content:

The technical problem to be solved by the utility model is to provide a motor protection controller with multi-network communication, accurate measurement, flexible and reliable structure, and modularized functions.

The concrete technical scheme that solves the above-mentioned technical problem is as follows:

This motor protection controller is composed of two parts: a display module and a main circuit; it is characterized in that the main circuit includes a voltage measurement function module, a current transformer module, an analog signal processing circuit, a processor unit, and 8 digital signal inputs Interface, clock circuit, storage circuit, AO analog output module, remote monitoring display interface, industrial field bus interface, 5-way relay output interface and switching power supply module; the voltage measurement function module and current transformer module are the same as the analog signal processing circuit Communication connection: the analog signal processing circuit, 8-way digital signal input interface, clock circuit, storage circuit, AO analog output module, remote monitoring display interface, industrial field bus interface, and 5-way relay output interface communicate with the processor unit together connection; the switching power supply module is connected with other modules.

In the above solution, the current transformer module is used for built-in 2A, 6.3A, 25A, 63A, 100A class transformers, or external 250A, 500A, 800A class dedicated high-current transformers.

In the above solution, the remote monitoring display interface is used to connect a display module.

In the above scheme, the industrial field bus interface is used to connect the Modbus communication module and the PROF IBUS-DP communication module.

In the above solution, the industrial field bus interface can also be externally connected to a DeviceNet communication module.

The utility model motor protection controller is an intelligent, networked and digital low-voltage motor protection controller developed according to IEC international standards; it changes the traditional motor protection and control mode, and can replace thermal relays, current transformers, and intermediate relays , transmitters and other conventional electrical components, while fully realizing the integration of protection, measurement and control, the advanced network communication technology and distributed intelligent technology are integrated into the MCC control center, thus providing a scientific and effective solution for industrial production process control. Field-level protection, measurement and control functions. Since the internal circuit of the device also adopts a pure industrial modular design, additional functions can be freely combined to reduce user costs. At the same time, it is equipped with a display interface, and the humanized buttons are convenient for setting and operation. It is convenient for production debugging, arrange inventory according to different user needs, reduce production cycle and reduce cost.

In addition, this motor control protector also has various digital protection functions such as overload, current imbalance, ground/leakage, undercurrent, stalled rotor, undervoltage, overvoltage, underpower, start-up acceleration timeout, etc., to meet direct start-up , two-way start, star/delta start and other starting methods; rich recording functions, which can record the instantaneous value of parameters when multiple faults occur, and guide fault analysis; flexible configuration of protection functions, which is convenient for users to balance safety production and continuous production; protection control The module and the display operation unit adopt a separate installation structure, which is extremely flexible for installation and maintenance; it realizes the measurement of various electrical parameters such as the three-phase current and ground current of the motor circuit; it can be connected with RTU, PLC and various microcomputer industrial control configuration software (iFIX, WinCC, Intouch, KingView, MCGS) realize network communication and form a distributed integrated power monitoring system.

Description of drawings:

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of the exterior structure of the display module of the multifunctional intelligent motor protection controller described in the present invention.

Fig. 2 is a schematic block diagram of the circuit principle of the multifunctional intelligent motor protection controller body of the utility model.

Fig. 3 (a), Fig. 3 (b), Fig. 3 (c), Fig. 3 (d) are the module interface definitions involved in the multifunctional intelligent motor protection controller described in the utility model, wherein, Fig. 3 (a ) is the voltage measurement function module; Figure 3(b) is the Modbus communication module; Figure 3(c) is the AO analog output module;

Figure 3(d) is the PROFIBUS-DP communication module.

Detailed ways:

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific illustrations.

Referring to Fig. 1, the display module of the utility model product named MC820 is shown in the figure, and a plurality of operation buttons are arranged on it. It is used to realize the motor operation control and display function, and to realize the parameter setting function; among them, "Stop/Run" is always on when it is stopped, indicating that the working power is normal, and it is flashing during operation; "Communication" is off when there is no communication. On, always on when communicating through the host computer; "alarm/fault" flashes when tripping and alarming, and is always on after a fault occurs; "reset" press this button to clear the fault indication after the fault stops and exit the fault state. This MC820 display module uses 122*32 dot-matrix liquid crystal as the display screen, which can display the real-time data of motor operation, operation status and equipment parameter information.

Refer to Figure 2. During the specific preparation, the circuit design of the body adopts the idea of modularization. The body has built-in transformers of 2A, 6.3A, 25A, 63A, and 100A grades, and external dedicated high-current transformers are used for 250A, 500A, and 800A grades. The board is equipped with a voltage measurement function module, an AO analog output module, a Modbus communication module, a PROFIBUS-DP communication module, and an external DeviceNet communication module and a display module (the definition interfaces of related modules are shown in Figure 3). Certainly, the additional function module is used when the user selects an additional function. When selecting the communication mode, you only need to insert the corresponding communication module, and then complete the communication connection through display settings.

The operation process of the whole equipment is as follows: the input voltage and current signals are converted by analog signal processing circuit, mainly to linearly amplify and shape the input signal and protect the subsequent circuit, and then the processor unit performs sampling, quantization and calculation, according to the selection The operation mode of the motor protector is used to control the state of 8 input signals and 5 relay outputs. The logic state and output mode of the input ports and output relays can be set through communication and display buttons. The processor unit also controls analog output, communication and display, monitors input voltage and current, protects the reliable operation of the motor and records relevant parameters.

The motor controller measurement and protection parameters are shown in Table 1 and Table 2 below.

Table 1 is the technical parameter table of the measurement function of the utility model multifunctional intelligent motor protection controller.

Table 2 is a technical parameter table of the protection function of the utility model multifunctional intelligent motor protection controller.

Table 1

Note: * is an optional function.

Table 2

Through the real-time monitoring of the three-phase current, three-phase voltage, leakage current and contactor status of the motor, the perfect protection of the motor is realized. Various protection functions are independent of each other, and multiple protection functions may be triggered at the same time, but only the protection function that first meets the tripping condition issues a trip command. All protection functions can be set, started or closed according to the actual situation through the host computer or display module, and the protection parameters can be adjusted. All protection parameters are set at the factory according to the requirements provided by the user, and the user can also set the requirements through the control panel and the company's internal communication software.

The basic principles and main features of the present utility model and the advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (5)

1. a motor protection controller is made up of display module and body circuit two parts; It is characterized in that described body circuit comprises voltage measurement functional module, current transformer module, analog signal processing circuit, processor unit, 8 way word signal input interfaces, clock circuit, memory circuit, AO analog output module, remote monitoring display interface, industrial field bus interface, No. 5 relay output interface and switch power modules; Described voltage measurement functional module summation current transformer module connects with the communication of analog signal treatment circuit; Described analog signal processing circuit, 8 way word signal input interfaces, clock circuit, memory circuit, AO analog output module, remote monitoring display interface, industrial field bus interface, the common connection of communicating by letter with processor unit of No. 5 relay output interfaces; Each module of described switch power module and all the other connects.

2. according to the motor protection controller of claim 1, it is characterized in that described current transformer module is used for built-in 2A, 6.3A, 25A, 63A, 100A grade instrument transformer, perhaps external 250A, 500A, the special-purpose great current mutual inductor of 800A grade.

3. according to the motor protection controller of claim 1, it is characterized in that described remote monitoring display interface is used for connecting display module.

4. according to the motor protection controller of claim 1, it is characterized in that described industrial field bus interface is used for connecting Modbus communication module and PROFIBUS-DP communication module.

5. according to the motor protection controller of claim 1, it is characterized in that described industrial field bus interface can also external connection DeviceNet communication module.

Images