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Unformatted text preview: that the pull-in power is used as a main
reference. +24 V DC RL L V
0V +24 V DC RL L C V R
0V Load resistance (RL) Protective capacitor (C) Inductance of load (L) Protective diode or varistor (D) Protective resistor (R) Fig. 2.1.3: Protective circuits for electro-mechanical position sensors © Festo Didactic GmbH & Co. KG • FP 1110 29 2. Mechanical position switches 2.1.4 Examples of application Fig. 2.1.4: Door monitoring Fig. 2.1.5: Braking light switch 30 © Festo Didactic GmbH & Co. KG • FP 1110 2. Mechanical position switches Fig. 2.1.6: End position checking of transfer unit 2.2
position switches 2.2.1 Function description
With this type of proximity sensor, a pneumatic circuit is directly effected by means
of the mechanical effect of an approaching object. A plunger, for example, actuates a
pneumatic valve. As far as the design principles are concerned, this type of valve is
similar to the previously described electro-mechanical position switches....
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.
- Spring '12