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슈나이더 일렉트릭 코리아 웹사이트에 방문해 주셔서 감사합니다.

슈나이더 일렉트릭 코리아 웹사이트 방문자 분들 모두 환영합니다.
FAQ 검색
Why TesysT logic inputs are unexpectedly activated if nobody activated pushbutton connected to logic input?
It can happen due to very long cables connected to a logic input. This problem is more frequent in the case of AC signal than DC signal. Long cables (over 50m) have a capacitance that is significant enough for flowing the leakage current that can unintentionally activate TEsysT logic input.
Solution:
Use shorter cables
Use LTMR...BD instead of LTMR..FM. DC signal has a lower leakage current than AC.
Use interposing relay. The coil of the interposing relay has a lower impedance than the TEsysT logic input and so a greater current in the connected signal cable is needed to energize the relay. A push button installed far away will activate the relay (the relay must be close to TEsysT) and contact from the relay will activate LTMR logic input.
Add a resistor to each LTMR logic input.

슈나이더 일렉트릭 Korea

첨부 파일
Special_case_Long_lines_AC.pdf [642.13 KB]
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