Siemens SINUMERIK 804D sl Commissioning Manual page 157

The NC then calculates the reference point offset and enters it in the machine data:
• MD34090 $MA_REFP_MOVE_DIST_CORR[n] (reference point offset)
• MD34210 $MA_ENC_REFP_STATE[n] = 2
• MD34100 $MA_REFP_SET_POS[n] (reference point value)
Calibrating several absolute value encoders
For time-optimized calibration of the absolute value encoders of several machine axes, the
following procedure is recommended:
1. Depending on the machine design, move all or several machine axes to their reference
2. Perform an NCK reset. See above: Point 5.
3. Complete encoder calibration for all machine axes. See above point 6.
Recalibration
Recalibration of the absolute encoder is required after:
• Gear change between load and absolute encoder
• Removal/installation of the absolute value encoder
• Removal/installation of the motor with the absolute value encoder
• SRAM data loss of the NC, battery power failure
• PRESET
CNC Part 1 (NCK, PLC, drive)
Commissioning Manual, 11/2006, 6FC5397-2AP10-2BA0
– Select JOG > REF mode
– Select machine axis
– Press traverse direction key
Note
Pressing the traverse direction key does not move the machine axis!
To indicate that calibration has been completed, the value in the machine data changes
from 1 = enable encoder calibration to 2 = encoder calibrated:
The value from the machine data is shown as the actual position of the machine axis on
the user interface:
position. See above: Points 1 to 4.
NCK start-up
10.5 Parameterize axis data
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