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Kg fp 1110 29 2 mechanical position switches 214

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Unformatted text preview: that the pull-in power is used as a main reference. +24 V DC RL L V D 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 Mechanical-pneumatic 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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