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Les détecteurs de commutation numérique disposent d'une sortie PNP, NPN ou Namur, les détecteurs de mesure possèdent une sortie de tension (0...10 V) ou une sortie de courant (p. ex. 4...20 mA ou 0...10 mA).
Le couplage en parallèle de détecteurs à 3 fils est possible. Etant donné que la résistance interne du détecteur activé exerce une influence sur les autres détecteurs, il est nécessaire de monter des diodes de découplage.
Schémas de raccordement
Les schémas présentés indiquent l'état de commutation non excité. Un détecteur est à l'état excité dès qu'un objet de trouve dans sa portée de détection. Dans les schémas, Z désigne la position caractéristique de la résistance de charge, Uz correspond à la tension, qui est supérieure à cette résistance de charge. Si Uz = high (≈ +Vs), le courant circule, si Uz = low (≈ 0 V), aucun courant ne circule au-dessus de la résistance de charge. Une résistance de charge entre output et +Vs est appelée résistance de rappel à la source, une résistance de charge entre output et 0 V est la résistance de rappel à la masse.
Sortie PNP ou NPN
Les détecteurs à sortie PNP ou NPN sont composés de 3 conducteurs (+Vs, output et 0 V) et fonctionnent à courant continu (CC). Pour les détecteurs PNP, la résistance de charge se trouve entre output et 0 V (résistance de rappel à la masse), tandis qu'elle se situe entre +Vs et output (résistance de rappel à la source) pour les détecteur NPN. Lors de la commutation, la sortie PNP est donc reliée à la tension de service positive (sortie en logique positive), tandis que la sortie NPN est reliée lors de la commutation à la tension de service négative (sortie en logique négative). Les contacts à fermeture et à ouverture définissent la fonction de commutation. Les contacts à fermeture sont également appelés contacts normalement ouverts (NO) et les contacts à ouvertures contacts normalement fermés (NC). En cas d'excitation par un objet, les détecteurs avec fonction de contact à fermeture établissent des connexions de contact (Uz = high), tandis que les détecteurs avec fonction de contact à ouverture suppriment ces connexions (Uz = low).
Explanatory notes on the connection diagrams
The specified diagrams indicate the undamped output. A sensor is in a damped state when an object is located in within its scanning range. In the diagrams Z denotes the typical load resistance position; Uz denotes the voltage applied to this load resistance. If Uz = high (≈ +Vs), then current flows; if Uz = low (≈ 0 V), then no current flows via the load resistance. Load resistance between output and +Vs is referred to as pull-up resistance, load resistance between output and 0 V as pull-down resistance.
Mounting and mounting procedure
To rule out unintentional interference of the measuring field and to achieve maximum sensing distances, it is required to follow the mounting instructions and to maintain the specified minimum distances. If the minimum distances are undercut, a reduction of the sensing distances is expectable. A sensor test directly at the application is recommended.
Correction factors for different installation situations specified in the sensor data sheet have priority over the general guidelines below.
There must be a space equal to the diameter of the sensing head, with no metal interference. Following this rule the electrical field strength is less attenuated, which enables a larger sensing distance.
When mounted in ferromagnetic material these sensors require a space (x) behind the active area that is free of metal. Sensors can be installed shielded (flush) when mounted in non ferrous materials (colored metals etc.). Always read and follow the installation instructions for distance measuring sensors.
Minimum distances must be observed to prevent oppositely positioned sensors from affecting each other.
Maximum installation torque
To avoid damage to the proximity switches during mounting, the default torque value should not be exceeded. Reduce torque values by 30 % at the sensor’s face.
Mounting instructions for housings without threads
Strong, occasional housing loads, like those which occur e.g. during fixing with headless screws, must be avoided (IFRM 03, 04, 06). Incorrect installation can lead to irreversible damage to the proximity switch. Sensors with a housing diameter of 6.5 mm can be installed optimally with the plastic support bracket 10109474.
Cable dimensions
Set-up / Teach-In
Baumer Teach-In functions
Baumer AlphaProx sensors with linearized characteristic curve, factor 1 sensors and high sensitivity sensors have a teach function with several teach modes. This allows the measuring range to be freely configured within specified limits. If, for example, a small measuring range with a large signal amplitude is required, it is possible to limit this to a few millimeters. The operating direction of the analog output can also be inverted if required.
In addition, the switch-on and switch-off points of a digital output can be defined. These may lie both within and outside the individually programmed measuring range.
Teaching-in of the start position (e.g. 0 V), center position (e.g. 5 V) or end position (e.g. 10 V) of the measuring range. In this teach mode, the output characteristic curve can be shifted without changing the sensitivity or slope of the characteristic curve. It is used for electronic compensation of installation tolerances and thus enables quick and easy adjustment in series production.
The 2-point teach is used in applications in which two reference points (start and end position) can be approached. By adjusting the measuring range, the sensitivity or slope of the output characteristic curve can be perfectly adapted to the application and installation and mechanical manufacturing tolerances can be compensated. The first taught-in position always corresponds to the start value (e.g. 0 V) and the second to the end value (e.g. 10 V) Depending on the teach sequence, the output characteristic curve increases or decreases as the target object approaches.
Analog distance sensors with an additional digital output offer a window teach digital instead of a 2-point Teach analog. This allows defining a valid or invalid distance range between the target and sensor for the digital output - independent of the analog output signal. Depending on the teach sequence, the digital output is HIGH or LOW if the measured object is within the taught-in distance range. This teach function is used to define a separate switching signal, e.g. for an end position circuit, independently of the analog signal.
Factory Reset
All sensors with teach functions have a factory reset to reset the sensor to the factory settings.
