Siemens SINUMERIK 840D sl Function Manual page 383

Commissioning the direction-dependent LEC
1. Enable the "sag compensation, multidimensional" option.
2. Define the number of compensation interpolation points (see also "Compensation of sag
3. Perform the series machine startup:
4. Generate the tables with compensation values for the particular axes and traversing
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Note
Take into account the licensing procedure!
and angularity errors: Commissioning (Page 368)")
Two compensation tables for the positive and negative traversing directions should be
assigned to each axis and the number of compensation interpolation points defined using
the following machine data:
MD18342 $MN_MM_CEC_MAX_POINTS[<t>] (maximum number of interpolation points
for sag compensation)
with: <t> = Index of compensation table
Permissible range: 0 ≤ t < 2 * maximum number of axes
Example:
MD18342 [0] = 11; 11 interpolation points for the 1st table, e.g. positive traversing
direction, X axis
MD18342 [1] = 11; 11 interpolation points for the 2nd table, e.g. negative traversing
direction, X axis
MD18342 [2] = 21; 21 interpolation points for the 3rd table, e.g. positive traversing
direction, Y axis
MD18342 [3] = 21; 21 interpolation points for the 4th table, e.g. positive traversing
direction, Y axis
...
MD18342 [61] = ...; number of interpolation points for the 62nd table
NOTICE
ALARM 4400 is output when changing MD18342:
"Reorganization of the buffered memory!"
In order that an automatic memory configuration is possible but keeping all of the data
that has been entered up until now, no system boot (POWER ON) must be executed
without first performing a series machine startup.
– Generate an NC archive with the entries in MD18342 [<t>].
– Read-in the archive again.
→ The NC memory is automatically configured.
The compensation values can now be written to the memory locations for the tables.
directions as NC program (refer to the section "Measuring the error or compensation
values").
K3: Compensation
5.4 Interpolatory compensation
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