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4. Concepts of the cam disc
26
Festo.P.BE-CMMP-CAM-SW-EN en 1105a
Without translation (i.e. at 1:1), the slave would stop according to the following cam disc:
But with the translation 1:2, a master movement is simulated that is twice as wide: The
slave assumes that the
master
traveled from
position 0 to position 4
and so travels
according to its cam disc from position 1 to 3.
For the slave, “4,000” is displayed in FCT in this case as “setpoint value master”, although
the master is at “2” according to its own measuring reference system:
Warning
Since the X-axis of the cam disc in this example is run through twice
as fast, the resulting speeds of the slave drive are also twice as
high (correspondingly also acceleration and jerk).
And so it can make more sense to modify the cam disc of the slave
so that the transmission ratio between master and slave is 1:1.
Comment: The effect of the electronic gear unit corresponds to a change in the
parametrised number of increments of the encoder: Assuming that the master sends 1024
increments per revolution, but only 512 increments are parametrised for the slave, the
slave will assume with every revolution of the master that the master made two
revolutions (if 1:1 is entered as the transmission ratio).