Method realizing stable reception of self-control signals by high voltage cabinet in tape conveying self-control system

Abstract

The invention discloses a method realizing stable reception of self-control signals by a high voltage cabinet in a tape conveying self-control system. The method involves a PLC program segment and also involves a closing coil program part of the high voltage cabinet and a separating coil program part of the high voltage part. Pulse signal control of a falling edge is adopted during a kernel startstopping process. After pulse signals are transmitted, coil suction of a small relay is conducted. Auxiliary contacts of the small relay transmit signals to separating and closing coils of the high voltage cabinet; 2 seconds (SST#2S) are added to a TV terminal of a time relay, a 2 second electrification time delay is achieved and 2 second electrification of a 401M:Q1 coil is ensured. Therefore, the closing coil of the high voltage cabinet gets enough time for suction and enough time for separation. In this way, a problem of instability of closing and separating signals of the high voltage cabinet is solved and a problem of control failure is also solved. At the same time, a reliable guarantee is given to safety of tape production.

Description

technical field [0001] The invention relates to the technical field of electrical protection control of a belt transportation system, in particular to a method for stably receiving an automatic control signal in a high-voltage cabinet in the belt transportation automatic control system. Background technique [0002] The tape conveying system of Gaocun Iron Mine is protected by automatic interlocking operation. During the end of production and the start-up process, it happened that the upper-level tape machine issued an instruction to stop or start the next-level tape machine, but the next-level tape machine did not execute the command. The phenomenon appeared on the high-voltage cabinet, but it did not appear on the low-voltage cabinet. This problem has a major impact on the safety of production. We observed and studied that the pulse signal time in the PLC program was too short, which caused the high-voltage cabinet to receive unstable self-control signals, thus produce a l...

AI Technical Summary

Problems solved by technology

[0002] The tape conveying system of Gaocun Iron Mine is protected by automatic interlocking operation. During the end of production and the start-up process, it happened that the upper-level tape machine issued an instruction to stop or start the next-level tape machine, but the next-level tape machine did not execute the command. The phenomenon appeared on the high-voltage cabinet, but it did not appear on the low-voltage cabinet. This problem has a major impact on the safety of production. We observed and studied that the pulse signal time in the PLC program was too short, which caused the high-voltage cabinet to receive unstable self-control signals, thus out of control phenomenon

[0003] The research found that in the automatic control system, the pulse signal control of the falling edge is adopted in the process of stopping the core and starting. After the pulse signal is sent out, the coil of the small relay is pulled in, and then the signal is sent to the high-voltage cabinet through the auxiliary contact of the small relay. The opening and closing coils of the high-voltage cabinet, because the duration of the pulse signal is only tens of microseconds, and the coil pull-in of the small relay is also tens of microseconds, resulting in the closing coil and opening coil of the high-voltage cabinet have not yet received the signal, the signal just disappeared

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