Leibinger JET3 up, Руководство по эксплуатации

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Page 288 Job Editor Group 8
Release R1.06 JET3up
8.5.3.6 Speed measuring with two sensors
As an alternative to the use of an external encoder or a constant internal speed
there is a third option available:
The current production speed can be measured on the basis of the signals from
two sensors connected to interface X5. Sensor 1 has to be connected to
X5.5
(PrintGo Gate input) and sensor 2 to X5.4 (PrintGo input). With this setup PNP-
sensors
are required for both inputs.
Function See Figure 158
Sensor setup:
The two sensors have to be mounted on the production line in a way that they can
be activated by the products passing by. For this the two sensors have to be
mounted on the same height
(1)
and at a distance from each other
(2)
. As higher
the production (line) speed as larger should be the sensor distance. The maximum
distance allowed is 250 mm
(3) . The distance between the two sensors has to be
smaller than the distance between two products (4) . As a rule of thumb there must
be never more than one product between the 2 sensors! (5)
The actual distance has to be measured and entered in the corresponding input
field
(6) .
With a product passing the first sensor ( sensor 1 ) the speed measurement starts
(7) .
The measurment is stopped as soon as the product passes the second sensor (8)
( sensor 2 ). This second sensor (8) works also as the <PrintGo> sensor and
controls the start of the printout. It is mandatory that sensor 1 (start sensor for
speed measuring) is always mounted before sensor 2 (stop sensor for speed
measuring and PrintGo sensor).
The production speed is calculated from the time measured and the distance
entered. Working with short distances it may happen that right after the start of
the production line there are no values of the measured speed available. For this
case the iternal speed set
(9) is taken as default.