Siemens sinumerik 840D sl Function Manual page 158

Detailed description
2.3 Start-up of gantry axes
Function generator/measuring function
The activation of the function generator and measuring function will be aborted on the
synchronized axis with an error message.
When an activation of the synchronized axis is absolutely necessary (e.g. to calibrate the
machine), the leading and synchronized axes must be temporarily interchanged.
Note
Generally, the start of the function generator, measuring functions and AM setup triggers the
virtual axes to abort upon error recognition.
Special cases
If individual axes have to be activated, the gantry groups must be temporarily canceled. As
the second axis no longer travels in synchronism with the first axis, the activated axis must
not be allowed to traverse beyond the positional tolerance.
If the gantry grouping is canceled, the following points must be noted:
• Always activate the traversing range limits and set them to the lowest possible values
• Synchronize the gantry grouping first if possible and then execute a POWER-ON-RESET
• Avoid using the step-change function. Position step changes are only permissible if they
• Always use an offset of 0 for the function generator and measuring function in contrast to
• Set the amplitudes for function generator and measuring function to such low values that
References:
/FBA/ Description of Functions, Drive Functions, Speed Control Loop (DD2)
Note
As a supplement to the more general description given here of features of start-up and
dynamic control response of drives, a complete example of a concrete constellation defined
on the basis of its machine data can be found in Chapter "Example".
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(position tolerance)
without referencing the axes again. This ensures that the traversing range limits always
refer to the same position (i.e. that which was valid on power ON).
stay within the permitted tolerance.
the recommendations for normal axes.
the activated axis traverses a shorter distance than the position tolerance allows. Always
activate the traversing range limits as a check (see above).
Special functions: Gantry Axes (G1)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0