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.
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.
Gepubliceerd voor: Schneider Electric Belgium
Hulp nodig?
Selecteer zelf het juiste product
Vind snel en eenvoudig de juiste producten en toebehoren voor uw toepassingen.
Offerte aanvragen
Dien uw aanvraag online in en een expert zal contact met u opnemen.
Verkooppunten
Vind eenvoudig de dichtstbijzijnde distributeur van Schneider Electric op uw locatie.
Help Center
Vind de antwoorden die u nodig heeft via bladeren door veelgestelde vragen over onderwerpen.