Siemens SINUMERIK 804D sl Commissioning Manual page 156

NCK start-up
10.5 Parameterize axis data
The SINUMERIK 840D sl supports the following types of calibration:
• Operator-assisted calibration
• Automatic calibration using probe
• Calibration using BERO
The calibration using the probe and BERO is described in:
Literature
Function Manual Basic Functions; Reference point approach: Automatic adjustment with
measuring probe, adjustment with BERO
Operator-assisted calibration
During operator-assisted calibration, the machine axis of the absolute encoder is moved to
the known machine position (reference position). The position value of the reference position
is taken over by the NC as the reference point value.
Recommended procedure
1. Parameterization of referencing mode
2. Approaching referencing position
3. Assumption of the reference position in the NC
4. Enabling encoder calibration
5. Activate changed machine data by NCK reset.
6. Completing encoder calibration
156
– MD34200 $MA_ENC_REFP_MODE[n] = 0
Traversing the machine axis to the referencing position in JOG mode. Approach direction
according to machine data:
– MD34010 $MA_REFP_CAM_DIR_IS_MINUS (reference point approach in minus
direction) (0 = positive, 1 = negative approach direction)
Notice
To avoid the actual position of the machine axis being falsified by backlash in the drive
train, reference point approach must be performed at low velocity and always from the
same direction.
The reference position is entered in the machine data:
– MD34100 $MA_REFP_SET_POS[n] (reference point value)
Encoder calibration is performed in the machine data:
– MD34210 $MA_ENC_REFP_STATE[n] = 1
When the NC has started up, encoder calibration is completed in mode: JOG > REF for
the machine axis by once more pressing the direction key as described in point 2:
CNC Part 1 (NCK, PLC, drive)
Commissioning Manual, 11/2006, 6FC5397-2AP10-2BA0