Control system and method for safety band-type brake of frequency converter

Abstract

The invention discloses a control system and method for a safety band-type brake of a frequency converter. The control system comprises two or more processors, a control signal output channel, an output state feedback channel and a switch. The processors are in one-to-one correspondence with the control signal output channels, the output state feedback channels and the switches. Each processor isused for respectively outputting a control instruction to the corresponding control signal output channel when safety band-type brake control is carried out, and outputting a corresponding control signal through the control signal output channel so as to disconnect a switch connected with the control signal output channel and enable a brake band-type brake device connected with the switch to carryout power-down band-type brake; and receiving state feedback signals fed back by the corresponding output state feedback channels, and diagnosing whether software exception and/or hardware exceptionexists or not by judging whether the state feedback signals are consistent with the control instruction or not. The control system and the control method are easy to implement, high in adaptability, high in reliability and low in cost.

Description

technical field [0001] The application relates to the technical field of power electronics, in particular to a control system for a frequency converter safety brake, and also relates to a control method for a frequency converter safety brake. Background technique [0002] With the continuous improvement of the level of industrial automation, industrial applications involving frequency converters and motors are becoming more and more extensive. On the basis of improving efficiency and reducing energy consumption, the safety of system machinery is becoming increasingly important. Among them, for frequency converters, in order to meet the technical requirements of functional safety, the main safe braking control methods currently used include the following two types: [0003] one, such as figure 1 As shown, the two electronic switches K1 and K2 are connected in series, K1 and K2 are respectively controlled through two independent switch signals of SBC_1 and SBC_2, and the ext...

AI Technical Summary

Problems solved by technology

The above scheme needs to use at least 3 sets of relays with linked contacts, which leads to complex structure and high cost of relays

In addition, one TEST port is used to output one test signal, and there is only one test circuit, which fails to independently open the circuits where relays K1 and K2 are located, which is not conducive to the improvement of diagnostic coverage.

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