BY12512d_e.doc / Mai-08
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As a special, the BY 125 can even operate with different number of marker pulses on both
sides. This is possible due to the following features:
a. The master index input is equipped with a programmable index divider, which, for
example, allows sampling of only each fifth marker pulse.
b. The slave index input is locked in a way that it becomes active only once after each
valid master marker pulse.
This enables the user, in terms of one machine cycle, to have for example five master markers
and three slave markers. Upon start up, the BY 125 checks for the nearest marker couple and
sets them in line. Subsequently, each fifth master index will be checked with each third slave
index.
Operation mode 8 provides a fully unlocked function of the index inputs and every couple of
marker impulses will cause a correction, no matter if the master leads the slave index or vice-
versa.
This mode needs setting of a ”maximum index error” to the ”Impulse Index” register (setting in
slave encoder increments). Errors higher than the maximum index error setting will not be
corrected with this mode. The differential speed to correct for the index error can be set by
register ”Trim speed”.
Mode 8 is perfectly suitable for compensation of wheel slip with large cranes (reference marks
on the rails) and to equalize different distance between products when passing from one
conveyor to another.
Sensor “Edge of product” = Index Master
Sensor “Pitch of chain” = Index Slave
Master
Slave
Application of mode 8 to control distance between products.
Fig.7
