POSICON positioning control – Supplementary manual for series SK 200E and SK 250E-FDS
48 BU 0210 en-3117
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4.9.4 Taking a speed ratio between master and slave into account
Setting a fixed speed ratio
A speed ratio between the master and the slave can be taken into account via the parameters P607
"Speed Ratio" and P608 "Reduction Ratio".
The speed ratio is entered into the arrays of the unused encoder.
N
Slave
= P607 [-xx] / P608 [-xx] * N
Master
P105
Slave
= P607 [-xx] / P608 [-xx] * N
Master
* 1.05…1.5
Setting a variable speed ratio
With the use of an analogue input, the speed ratio between the master and the slave can be
continuously varied between -200% and a maximum of 200% of the speed of the master.
For this, the relevant analogue input (P400…) must be set to function 25 "Gearing speed ratio". With
the adjustment of the analogue input (P402… / P403…) this is scaled according to the existing
requirements. Negative values cause a change in the direction of rotation.
It is possible to adjust the speed ration "online", i.e. during running. However, it should be noted that
the "Position slip error" during adjustment can have considerably larger values than in normal
synchronous operation. The reason for this is the necessary adjustment to the new speed and must
be taken into account as necessary by changing the permissible slip error (in parameter P630
"Position slip error".
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