9 Speed measuring
9.1 Incremental encoder
The electrical connection of an incremental encoder is described in the chapter 'Connection of the
goods scanners'. Now the mechanical attachment of the conveyor to the encoder will be de-
scribed. If the speedmeasuring is done by an incremental encoder, on the control panel the step
width must be programmed so that the speed measuring is made correctly. The step width is the
traveling way of a good in between two encoder steps. Figure 42 shows an example how to cal-
culate the step width:
Figure 42: Incremental encoder
Example:
The incremental encoder 1 gives 200 pulses per revolution. It is attached directly to the shaft of
the conveyor 2. The diameter d is 100 mm. Calculation:
Step =
d
1
2
=
=
314 mm
200
d * Pi
Pulse
1.57 mm
5999.545-01G 28.02.2006 WM
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