Connection and circuit technology 1012 three wire dc

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Unformatted text preview: Didactic GmbH & Co. KG • FP 1110 141 10. Connection and circuit technology A potential protective grounding terminal is identified by green-yellow. In the case of designs for AC or AC/DC (universal current), the connection cables may be identified in any colour other than green-yellow. Generally, however brown or blue is selected, as for direct current designs. Voltage supply e.g.: 15 – 250 V DC 20 – 250 V AC In the case of two-wire sensors it should be noted that in the unactuated status, a residual current must flow to provide a current supply for the proximity sensor. The residual current also flows via the load. In the acknowledged status, a minimum load current must flow to guarantee the reliable operation of the proximity sensor. 142 © Festo Didactic GmbH & Co. KG • FP 1110 10. Connection and circuit technology 10.1.2 Three-wire DC technology Proximity sensors in three-wire technology have three connecting wires. As a rule, the colours of the connecting wires comply with European standard EN 50 044. Two w...
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