Multiplexing monitoring expansion card and frequency converter

Abstract

The utility model discloses a multiplexing monitoring expansion card and a frequency converter. The multiplexing monitoring expansion card comprises a data interaction CPU, a communication control CPU, a buffer memory, a monitoring communication interface and a storage module; wherein the data interaction CPU is connected with a main control CPU, the data interaction CPU, the buffer memory, the monitoring communication interface and the storage module are respectively connected with the communication control CPU, and the monitoring communication interface is connected with an upper computer; the data interaction CPU is used for setting a monitoring channel of a power electronic device and reading monitoring waveform data and fault waveform data; the communication control CPU caches the read monitoring waveform data and fault waveform data to the buffer memory in a rolling manner, and controls the storage module to record the fault waveform data when an upper computer signal is not received within a preset time; the monitoring communication interface communicates with the upper computer and uploads monitoring waveform data and fault waveform data to the upper computer for waveform display. According to the scheme, the reliability of the monitoring expansion card is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a multiplexing monitoring expansion card and a frequency converter. Background technique [0002] Effective monitoring of the working conditions of the industrial site is an essential and important link to ensure the normal operation. Capturing and saving the operating data and waveforms at the moment of failure is an important basis for objective analysis of accidents. Since the frequency converter needs to work continuously for a long time, and the operating conditions are complex, occasional failures will inevitably occur. Generally speaking, it is difficult to judge under which working conditions these failures occurred, and a single monitoring cannot traverse all working conditions, so it is very difficult to record data monitoring and troubleshoot the cause, thus affecting the customer's production and even causing loss. [0003] The fault data monitoring in co...

AI Technical Summary

Problems solved by technology

Since the frequency converter needs to work continuously for a long time, and the operating conditions are complicated, it is inevitable that there will be occasional failures

Generally speaking, it is difficult to determine the working conditions under which these faults occurred, and a single monitoring cannot traverse all working conditions, so it is very difficult to record data monitoring and troubleshoot the cause, thus affecting the customer's production and even causing loss

[0003] Fault data monitoring in common power electronic devices is to use the host computer to monitor the output waveform data of the inverter, and record the fault data through the keyboard and ferroelectric storage scheme. The keyboard failure record information is not conducive to accurate diagnosis of problems such as module damage after long-term operation and occasional abnormal operation; it is costly to obtain all working condition data during long-term business trips, and it takes time and effort to troubleshoot the cause of occasional failures; Large; the interface compatibility of the SD card storage solution attached to the terminal board is poor, the portability of the ferroelectric storage solution attached to the control board is poor, and the hardware changes are large

[0004] In view of this, the current products of data monitoring and recording technology generally embed the function of data storage technology as a sub-module into the self-developed monitoring system, such as the S7 series of Siemens and the Zigmo monitoring system of Hitachi. Such products are mainly used for a certain series of products, so the compatibility and portability of the products cannot be guaranteed

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