Selbit ISP-12F, Manual Handbook

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Point 6
Installation of the up and down electronic feed limit switches.
Head movement limit switches are required for the correct operation of the adjuster. The set
includes 2 pcs of electronic magnetic limit switches type TS18-05P-2 Highly.
These are typical contactless sensors that respond to the approach of a metal element marking
the maximum movement of the machine head. These sensors should be mounted into pre-
made holes, using mounting nuts supplied with the sensor. The function of metal elements
activating the limit switch can be provided by angles attached to the moving part of the head
passing the face of the sensor at a distance of 2–4 mm. When routing the cable from the limit
switches, make sure that they are as far away as possible from other cables and power
devices.
Remember that there is a specific time interval between the moment the limit switch is
activated until the head stops, depending on the mechanical inertia of the machine. During
that time, the head passes a certain distance, therefore it is not possible to mount the sensor in
such a way that the activating metal element interferes with the location of the sensor (Figure
6). It is also necessary to provide for the possibility of changing (adjusting) the mounting
place of the metal element activating the limit switch so as to adjust the switch-off point of the
drive during the start-up of the adjuster.
Instead of electronic limit switches, you can also use good quality mechanical limit switches
with NC terminals, connecting them to the adjuster as shown in Figure 8.