Siemens SINUMERIK 840D sl Function Manual page 299

Commissioning (principle)
1. Specify the number of compensation interpolation points (also see Section "Compensation
for droop and angularity error: Commissioning (Page 276)")
For the directional leadscrew error compensation, a compensation table for the positive
and a compensation table for the negative traversing directions must be assigned to each
axis. The number of compensation interpolation points of a table is defined in:
MD18342 $MN_MM_CEC_MAX_POINTS[ <compensation table index> ]
Example
– X axis: positive traversing direction, table 1, 11 interpolation points
– X axis: negative traversing direction, table 2, 11 interpolation points
Machine data:
– MD18342 $MN_MM_CEC_MAX_POINTS[ 0 ] = 11
– MD18342 $MN_MM_CEC_MAX_POINTS[ 1 ] = 11
2. Reading in a commissioning archive that has been created:
Operating area: "Commissioning" > "ETC" key > "Commissioning archive" > "Read in
commissioning archive" > "OK"
The compensation tables are then available.
3. To simplify commissioning, create an NC program by which the compensation parameters
are written into the machine data and system variables (see Section "Example (Page 301)").
4. Run the NC program on the control:
Mode: "AUTOMATIC" > Select program > NC start
5. Power-on (warm restart).
6. Now, comparative measurements can be made using the laser interferometer.
7. To further improve the compensation results, it is also conceivable to correct individual
compensation values in the program. A POWER ON is no longer necessary when reading-
in the table again.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
CAUTION
Possible data loss
A change to the machine data MD18342 $MN_MM_CEC_MAX_POINTS, which
configures memory, reconfigures (Page 801) the NC memory the next time the control
starts. This can result in the loss of all user-specific data.
Creating a commissioning archive:
Operating area: "Commissioning" > "ETC" key > "Commissioning archive" > "Create
commissioning archive" > "OK" > Selection: "NC data"
K3: Compensations
5.4 Interpolatory compensation
299