Data communication module of motor protector

Abstract

The invention discloses a data communication module of a motor protector. The data communication module comprises a central processing unit, a storage unit, a power supply unit, a configurable module, a local application interface, field control interfaces and a connector assembly, wherein the field control interfaces comprise a status input interface, a status output interface, a data acquisition module and a data uploading interface; the connector assembly is used for signal connection; the data acquisition interface of the field control interfaces is arranged on the communication module for acquiring current, voltage, startup time, operation and fault data of a motor; the data uploading interface is arranged on the communication module for packing the acquired data according to the requirements set by the user and then uploading the packed data to an upper communication device for an upper acquisition system. The data communication module of the motor protector disclosed by the invention is used for judging whether data acquisition is carried out to the motor protector or not by monitoring the operation status of an MCC (Motor Control Center) switch cabinet motor protector, so that system does not waste redundant communication time.

Description

technical field [0001] The invention relates to a data communication module of a motor protector, which is an intelligent data acquisition device for a motor protector of an MCC switch cabinet. Background technique [0002] At present, my country's thermal power (or nuclear power, etc.) power plants, petrochemical, and steel industries are equipped with a large number of motors (motors). Many motor-supporting switch cabinets are equipped with motor protectors to pass the motor current and other signals through 4 -20mA signal is transmitted to the PLC or DCS system, but these signals basically do not require interlocking actions and are only used as a display of the motor running state, so many of these signals in the PLC / DCS system are only converted through the internal data of the control system; but they occupy the PLC A large number of channel resources of the / DCS system make the PLC / DCS system extremely large. [0003] Some users use the operation station (the operation...

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Problems solved by technology

[0002] At present, my country's thermal power (or nuclear power, etc.) power plants, petrochemical, and steel industries are equipped with a large number of motors (motors). Many motor-supporting switch cabinets are equipped with motor protectors to pass the motor current and other signals through 4 -20mA signal is transmitted to the PLC or DCS system, but these signals basically do not require interlocking actions and are only used as a display of the motor running state, so many of these signals in the PLC / DCS system are only converted through the internal data of the control system; but they occupy the PLC A large number of channel resources in the / DCS system make the PLC / DCS system extremely large

[0003] Some users use the operation station (the operation station is installed with configuration software, such as IFIX, Intouch, etc.) to directly communicate with the motor protector through the field bus for data collection. To a certain extent, the data collection function has been realized, but it is impossible to determine which motor controllers are running, which are not running or are in a fault state that prevents the data acquisition system from functioning normally

For example: an operator station communicates with multiple motor protectors to complete the data acquisition work. Normally, the data acquisition is in the form of one question and one answer on the bus, and the time required is Time-a (due to the immediate response, the general time is relatively short, such as 20ms), when the motor protector is not running or other reasons cause the motor protector to fail to feed back data, the operator station will send multiple (generally 3 times) data requests in succession at intervals of Timeb (generally 200ms), and in During this interval, the system cannot do other similar work

One acquisition port (Modbus-RTU interface) can complete the acquisition data refresh of 20 to 30 or more motor protectors within 1 second. If 4 motor protectors fail, the system will time out and wait for 2.4 seconds , but an extra 2.4 seconds per cycle is enough to keep the entire data acquisition system from refreshing

[0004] The currently used motor protectors are all Modbus-RTU data interfaces, which can only be used for data acquisition by a single data acquisition port. When the acquisition system fails, all the data during the failure period will be lost. This acquisition system is not good for users. Reliable and unsafe, this situation is not allowed to happen during system operation

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