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7280 Fiches technique(PDF) 41 Page - PHOENIX CONTACT |
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7280 Fiches technique(HTML) 41 Page - PHOENIX CONTACT |
41 / 43 page ILB IB AI4 AO2 7280_en_02 PHOENIX CONTACT 41 22.2 Connection Method RTD 4-Wire Connection The contact resistance of the connections and the cable resistances have virtually no effect due to the 4-wire connection technology. Figure 19 RTD 4-wire connection 22.3 RTD 3-Wire Connection With 3-wire technology, the effect of the cable resistance on the measured result in the terminal is minimized by multiple measuring of the temperature-related voltage and corresponding calculations. With this connection method, one cable can be eliminated. Figure 20 RTD 3-wire connection RTD 2-Wire Connection With Connector Compensation 2-wire technology is a more cost-effective connection method. The long U+ and U- cables to the sensor are no longer needed here. They are jumpered directly at the connector. The temperature-related voltage is not directly measured at the sensor and therefore not falsified by the two cable resistances RL. This connection method is ideal for sensors with high R0 (e.g., Pt 1000, Ni 1000). With 2-wire connection with connector compensation, minimized tolerances can be achieved through: – Parameterization of the terminal on a 4-wire connection – Direct jumpering of the U+ and U- connections at the live measuring cables A larger conductor cross section and sensors with higher R0 further improve the tolerances of these connection versions. Figure 21 RTD 2-wire connection with connector compensation 1 2 1 2 3 4 1 2 3 4 I+ RES I- RES U- U+ RTD R L I+ I- 7285A018 U- (I = 0 µA) R L U+ (I = 0 µA) 1 2 1 2 3 4 1 2 3 4 I+ RES I- RES U- U+ RTD R L R L I+ I- 7285A017 U- (I = 0 µA) 1 2 1 2 3 4 1 2 3 4 I+ RES I- RES U- U+ RTD R L I+ I- 7280B011 R L |
Numéro de pièce similaire - 7280 |
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Description similaire - 7280 |
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